 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| data sheet, v 1.0, may 2007 TDA7200 ask/fsk single conversion receiver version 1.0 wireless control components never stop thinking.
edition 2007-05-02 published by infineon technologies ag, am campeon 1-12, 85579 neubiberg, germany ? infineon technologies ag 2007-05-02. all rights reserved. attention please! the information herein is given to describe certain components and shall not be considered as a guarantee of characteristics. terms of delivery and rights to technical change reserved. we hereby disclaim any and all warranties, including but not limited to warranties of non-infringement, regarding circuits, descriptions and charts stated herein. information for further information on technology, delivery terms and conditions and prices please contact your nearest infineon technologies office in germany or the infineon technologies companies and our infineon technologies representatives worldwide ( www.infineon.com ). warnings due to technical requirements components may contain dangerous substances. for information on the types in question please contact your nearest infineon technologies office. infineon technologies components may only be used in life-support devices or systems with the express written approval of infineon technologies, if a failure of such components can reasonably be expected to cause the failure of that life-support device or system, or to affect the safety or effectiveness of that device or system. life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. if they fail, it is reasonable to assume that the health of the user or other persons may be endangered. data sheet, v 1.0, may 2007 TDA7200 ask/fsk single conversion receiver version 1.0 wireless control components never stop thinking. TDA7200 revision history: 2007-05-02 v 1.0 previous version: none page subjects (major changes since last revision) we listen to your comments any information within this document that you feel is wrong, unclear or missing at all? your feedback will help us to continuously improve the quality of this document. please send your proposal (including a reference to this document) to: sensors@infineon.com TDA7200 table of contents page data sheet 5 v 1.0, 2007-05-02 1 product description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1 overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.2 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.3 application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2 functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 pin definition and functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.3 functional block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.4 functional block description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.4.1 low noise amplifier (lna) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 2.4.2 mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.4.3 pll synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.4.4 crystal oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.4.5 limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2.4.6 fsk demodulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.4.7 data filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2.4.8 data slicer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2.4.9 peak detector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2.4.10 bandgap reference circuitry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 3 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.1 application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3.2 data filter design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 3.3 crystal load capacitance calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.4 crystal frequency calculation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3.5 data slicer threshold generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 3.6 ask/fsk-data path functional description . . . . . . . . . . . . . . . . . . . . . . . 25 3.7 fsk mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 3.8 ask mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 3.9 principle of the precharge circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 4 reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.1 electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.1.1 absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.1.2 operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 4.1.3 ac/dc characteristics at t amb = 25 c . . . . . . . . . . . . . . . . . . . . . . . . . 33 4.1.4 ac/dc characteristics at t amb = -20c ... +70c . . . . . . . . . . . . . . . . . . 38 4.2 test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 4.3 test board layouts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 4.4 bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 5 package outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 TDA7200 product description data sheet 6 v 1.0, 2007-05-02 1 product description 1.1 overview the ic is a very low power consumption single chip fsk/ask superheterodyne receiver (shr) for the frequency band 400 to 440 mhz. the ic offers a high level of integration and needs only a few external components. the device contains a low noise amplifier (lna), a double balanced mixer, a fully integrated vco, a pll synthesiser, a crystal oscillator, a limiter with rssi generator, a pll fsk demodulator, a data filter, an advanced data comparator (slicer) with selection between two threshold modes and a peak detector. additionally there is a power down feature to save current and extend battery life, and two selectable alternatives of generating the data slicer threshold. 1.2 features ? low supply current (is = 5.7 ma typ. in fsk mode, is = 5.0 ma typ. in ask mode) ? supply voltage range 5v 10% ? power down mode with very low supply current (50na typ.) ? fsk and ask demodulation capability ? fully integrated vco and pll synthesiser ? ask sensitivity better than -106 dbm over specified temperature range (-20 to +70c) ? fsk sensitivity better than -100 dbm over specified temperature range (-20 to +70c) ? limiter with rssi generation, operating at 10.7mhz ? 2nd order low pass data filter with external capacitors ? data slicer with selection between two threshold modes (see section 2.4.8 ) 1.3 application ? remote control systems ? alarm systems ? low bitrate communication systems table 1 order information type ordering code package TDA7200 sp000296473 pg-tssop-28 data sheet 7 v 1.0, 2007-05-02 TDA7200 functional description 2 functional description 2.1 pin configuration figure 1 pin configuration crst2 pdwn pdo data 3vout thres ffb opp sln slp limx lim ssel msel crst1 vcc lni tagc agnd lno vcc mi mix agnd ptst ifo dgnd vdd 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 tda 7200 TDA7200 functional description data sheet 8 v 1.0, 2007-05-02 2.2 pin definition and functions table 2 pin defintion and function pin no. symbol equivalent i/o schematic function 1 crst1 external crystal connector 1 2 vcc 5v supply 3 lni lna input 4.15v 50ua 1 57ua 4k 1k 3 500ua data sheet 9 v 1.0, 2007-05-02 TDA7200 functional description 4tagc agc time constant control 5 agnd analogue ground return 6 lno lna output 7 vcc 5v supply pin no. symbol equivalent i/o schematic function 1k 4.2ua 1.5ua 1.7v 4.3v 4 6 1k 5v TDA7200 functional description data sheet 10 v 1.0, 2007-05-02 8 mi mixer input 9mix complementary mixer input 10 agnd analogue ground return 11 ptst has to be left open 12 ifo 10.7 mhz if mixer output 13 dgnd digital ground return 14 vdd 5v supply (pll counter circuity) pin no. symbol equivalent i/o schematic function 8 1.7v 9 400ua 2k 2k 2.2v 4.5k 60 12 300ua data sheet 11 v 1.0, 2007-05-02 TDA7200 functional description 15 msel ask/fsk modulation format sector 16 ssel data slicer reference level sector 17 lim limiter input 18 limx complementary limiter input pin no. symbol equivalent i/o schematic function 1.2v 40k 15 1.2v 40k 16 330 15k 15k 18 17 2.4v 75ua TDA7200 functional description data sheet 12 v 1.0, 2007-05-02 19 slp data slicer positive input 20 sln data slicer negative input 21 opp opamp noninverting input 22 ffb data filter feedback pin pin no. symbol equivalent i/o schematic function 19 80a 15ua 3k 100 5ua 20 10k 21 200 5ua 100k 5ua 22 data sheet 13 v 1.0, 2007-05-02 TDA7200 functional description 23 thres agc threshold input 24 3vout 3v reference output 25 data data output 26 pdo peak detector output pin no. symbol equivalent i/o schematic function 10k 5ua 23 3.1v 24 20k ? 25 500 40k 26 446k TDA7200 functional description data sheet 14 v 1.0, 2007-05-02 27 pdwn power down input 28 crst2 external crystal connector 2 pin no. symbol equivalent i/o schematic function 27 220k 220k 4.15v 50ua 28 data sheet 15 v 1.0, 2007-05-02 TDA7200 functional description 2.3 functional block diagram figure 2 block diagram 2.4 functional block description 2.4.1 low noise amplifier (lna) the lna is an on-chip cascode amplifier with a voltage gain of 15 to 20db. the gain figure is determined by the external matching networks situated ahead of lna and between the lna output lno (pin 6) and the mixer inputs mi and mix (pins 8 and 9). the noise figure of the lna is approximately 3db, the current consumption is 500a. the gain can be reduced by approximately 18db. the switching point of this agc action can be determined externally by applying a threshold voltage at the thres pin (pin 23). this voltage is compared internally with the received signal (rssi) level generated by the limiter circuitry. in case that the rssi level is higher than the threshold voltage the lna gain is reduced and vice versa. the threshold voltage can be generated by attaching a voltage divider between the 3vout pin (pin 24) which provides a temperature stable 3v output generated from the internal bandgap voltage and the thres pin as described in section 3.1 . the time constant of the agc action can be determined by connecting a capacitor to the tagc pin (pin 4) and should be chosen along with the appropriate threshold voltage according to the intended operating case and interference scenario to be expected during operation. the optimum choice of agc time constant and the threshold voltage is described in section 3.1 . pdo : 2 vco : 64 det crystal osc data crystal pdwn ptst loop filter bandgap reference lna rf tagc vcc vcc agnd agc reference thres 3vout fsk pll demod ota lni dgnd - + mi x lno mi opp ffb slp vcc lim lim x if filter ifo sln msel limiter 68912 1718 22 21 19 20 25 26 23 24 3 4 14 13 2,7 5,10 15 11 1 28 27 - + ask fsk op + - ssel 16 data- slicer - u ref - + + cm cp logic h=ask l=fsk detector peak tda 7200 TDA7200 functional description data sheet 16 v 1.0, 2007-05-02 2.4.2 mixer the double balanced mixer downconverts the input frequency (rf) in the range of 400- 440mhz to the intermediate frequency (if) at 10.7mhz with a voltage gain of approximately 21db by utilising either high- or low-side injection of the local oscillator signal. in case the mixer is interfaced only single-ended, the unused mixer input has to be tied to ground via a capacitor. the mixer is followed by a low pass filter with a corner frequency of 20mhz in order to suppress rf signals to appear at the if output ( ifo pin). the if output is internally consisting of an emitter follower that has a source impedance of approximately 330 ? to facilitate interfacing the pin directly to a standard 10.7mhz ceramic filter without additional matching circuitry. 2.4.3 pll synthesizer the phase locked loop synthesizer consists of a vco, an asynchronous divider chain, a phase detector with charge pump and a loop filter and is fully implemented on-chip. the vco is including spiral inductors and varactor diodes. the frequency range of the vco guaranteed over production spread and the specified temperature range is 820 to 860mhz. the oscillator signal is fed both to the synthesiser divider chain and to the downconverting mixer. the vco signal is divided by two before it is fed to the mixer. depending on whether high- or low-side injection of the local oscillator is used, the receiving frequency range is 400 to 420mhz and 420 to 440mhz - see also section 3.4 . 2.4.4 crystal oscillator the calculation of the value of the necessary crystal load capacitance is shown in section 3.3 , the crystal frequency calculation is explained in section 3.4 . 2.4.5 limiter the limiter is an ac coupled multistage amplifier with a cumulative gain of approximately 80 db that has a bandpass-characteristic centred around 10.7 mhz. it has a typical input impedance of 330 ? to allow for easy interfacing to a 10.7 mhz ceramic if filter. the limiter circuit also acts as a receive signal strength indicator (rssi) generator which produces a dc voltage that is directly proportional to the input signal level as can be seen in figure 4 . this signal is used to demodulate ask- modulated receive signals in the subsequent baseband circuitry. the rssi output is applied to the modulation format switch, to the peak detector input and to the agc circuitry. in order to demodulate ask signals the msel pin has to be in its ?high?-state as described in the next chapter. data sheet 17 v 1.0, 2007-05-02 TDA7200 functional description 2.4.6 fsk demodulator to demodulate frequency shift keyed (fsk) signals a pll circuit is used that is contained fully on chip. the limiter output differential signal is fed to the linear phase detector as is the output of the 10.7 mhz center frequency vco. the demodulator gain is typically 200v/khz. the passive loop filter output that is comprised fully on chip is fed to both the vco and the modulation format switch described in more detail below. this signal is representing the demodulated signal with low frequencies applied to the demodulator demodulated to logic zero and high frequencies demodulated to logic ones. however this is only valid in case the local oscillator is low-side injected to the mixer which is applicable to receive frequencies above 420mhz. in case of receive frequencies below 420mhz high frequencies are demodulated as logical zeroes due to a sign inversion in the downconversion mixing process as the l0 is high-side injected to the mixer. see also section 3.4 . the modulation format switch is actually a switchable amplifier with an ac gain of 11 that is controlled by the msel pin (pin 15) as shown in the following table. this gain was chosen to facilitate detection in the subsequent circuits. the dc gain is 1 in order not to saturate the subsequent data filter wih the dc offset produced by the demodulator in case of large frequency offsets of the if signal. the resulting frequency characteristic and details on the principle of operation of the switch are described in section 3.6 . table 3 msel pin operating states the demodulator circuit is switched off in case of reception of ask signals. 2.4.7 data filter the data filter comprises an op-amp with a bandwidth of 100khz used as a voltage follower and two 100k ? on-chip resistors. along with two external capacitors a 2nd order sallen-key low pass filter is formed. the selection of the capacitor values is described in section 3.2 . msel modulation format open ask shorted to ground fsk TDA7200 functional description data sheet 18 v 1.0, 2007-05-02 2.4.8 data slicer the data slicer is a fast comparator with a bandwidth of 100 khz. this allows for a maximum receive data rate of up to 100kbaud. the maximum achievable data rate also depends on the if filter bandwidth and the local oscillator tolerance values. both inputs are accessible. the output delivers a digital data signal (cmos-like levels) for subsequent circuits. a self-adjusting slicer-threshold on pin 20 its generated by a rc- term. in ask-mode alternatively a scaled value of the voltage at the pdo-output (approx. 87%) can be used as the slicer-threshold as shown in table 4 . the data slicer threshold generation alternatives are described in more detail in section 3.5 . table 4 ssel pin operating states 2.4.9 peak detector the peak detector generates a dc voltage which is proportional to the peak value of the receive data signal. a capacitor is necessary. the input is connected to the output of the rssi-output of the limiter, the output is connected to the pdo pin (pin 26). this output can be used as an indicator for the received signal strength to use in wake-up circuits and as a reference for the data slicer in ask mode. note that the rssi level is also output in case of fsk mode. 2.4.10 bandgap reference circuitry a bandgap reference circuit provides a temperature stable reference voltage for the device. a power down mode is available to switch off all subcircuits which is controlled by the pwdn pin (pin 27) as shown in the following table. the supply current drawn in this case is typically 50na. table 5 pdwn pin operating states ssel msel selected slicing level (sl) x low external sl on pin 20 (rc-term, e.g.) high high external sl on pin 20 (rc-term, e.g.) low high 87% of pdo-output (approx.) pdwn operating state open or tied to ground powerdown mode tied to vs receiver on data sheet 19 v 1.0, 2007-05-02 TDA7200 applications 3 applications 3.1 application circuit figure 3 lna automatic gain control circuity the lna automatic gain control circuitry consists of an operational transimpedance amplifier that is used to compare the received signal strength signal (rssi) generated by the limiter with an externally provided threshold voltage u thres . as shown in the following figure the threshold voltage can have any value between approximately 0.8 and 2.8v to provide a switching point within the receive signal dynamic range. this voltage u thres is applied to the thres pin (pin 23) the threshold voltage can be generated by attaching a voltage divider between the 3vout pin (pin 24) which provides a temperature stable 3v output generated from the internal bandgap voltage and the thres pin. if the rssi level generated by the limiter is higher than u thres , the ota generates a positive current i load . this yields a voltage rise on the tagc pin (pin 4). otherwise, the ota generates a negative current. these currents do not have the same values in order to achieve a fast-attack and slow-release action of the 4 lna rssi (0.8 - 2.8v) vcc gain control voltage ota +3.1 v i load rssi > u threshold : i load =4.2a rssi < u threshold : i load = -1.5a u c c5 u c :< 2.6v : gain high u c :> 2.6v : gain low u cmax = v cc - 0.7v u cmin = 1.67v r4 r5 3vout 24 23 u threshold 20k ? thres tagc c18 TDA7200 applications data sheet 20 v 1.0, 2007-05-02 agc and are used to charge an external capacitor which finally generates the lna gain control voltage. figure 4 rssi level and permissive agc threshold levels the switching point should be chosen according to the intended operating scenario. the determination of the optimum point is described in the accompanying application note, a threshold voltage level of 1.8v is apparently a viable choice. it should be noted that the output of the 3vout pin is capable of driving up to 50a, but that the thres pin input current is only in the region of 40na. as the current drawn out of the 3vout pin is directly related to the receiver power consumption, the power divider resistors should have high impedance values. the sum of r1 and r2 has to be 600k ? in order to yield 3v at the 3vout pin. r1 can thus be chosen as 240k ? , r2 as 360k ? to yield an overall 3vout output current of 5a 1) and a threshold voltage of 1.8v note: if the lna gain shall be kept in either high or low gain mode this has to be accomplished by tying the thres pin to a fixed voltage. in order to achieve high gain mode operation, a voltage higher than 2.8v shall be applied to the thres pin, such as a short to the 3volt pin. in order to achieve low gain mode operation thres has to be connected to gnd. as stated above the capacitor connected to the tagc pin is generating the gain control voltage of the lna due to the charging and discharging currents of the ota and thus is also responsible for the agc time constant. as the charging and discharging currents are not equal two different time constants will result. the time constant corresponding to the charging process of the capacitor shall be chosen according to the data rate. according to measurements performed at infineon the capacitor value should be greater than 47nf. 1) note the 20k ? resistor in series with the 3.1v internal voltage source lna always in high gain mode 0 0.5 1 1.5 2 2.5 3 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 input level at lna input [dbm] u thres voltage range rssi level range lna always in low gain mode rssi level data sheet 21 v 1.0, 2007-05-02 TDA7200 applications 3.2 data filter design utilising the on-board voltage follower and the two 100k ? on-chip resistors a 2nd order sallen-key low pass data filter can be constructed by adding 2 external capacitors between pins 19 (slp) and 22 (ffb) and to pin 21 (opp) as depicted in the following figure and described in the following formulas 1) . figure 5 data filter design with r f1int =r f2int =r with q is the qualify factor of the poles where, in case of a bessel filter a=1.3617, b=0.618 and thus q=0.577 and in case of a butter worth filter a=1.414, b=1 and thus q=0.71 example: butter worth filter with f 3db =5khz and r=100k ?: c14=450pf, c12=225pf 1) taken from tietze/schenk: halbleiterschaltungstechnik, springer berlin, 1999 22 21 19 r f1 int 100k 100k c14 c12 r f2 int slp opp ffb db f r b q c 3 2 2 14 = db f qr b c 3 4 12 = a b q = TDA7200 applications data sheet 22 v 1.0, 2007-05-02 3.3 crystal load capacitance calculation the value of the capacitor necessary to achieve that the crystal oscillator is operating at the intended frequency is determined by the reactive part of the negative resistance of the oscillator circuit as shown in section 4.1.3 and by the crystal specifications given by the crystal manufacturer. figure 6 determination of series capaci tance vale for the quartz oscillator the required series capacitor for a crystal with specified load capacitance c l can be calculated as c l is the nominal load capacitance specified by the crystal manufacturer. example: 13.4 mhz: c l = 12 pf x l =1010 ? c s = 5.9 pf this value may be obtained by putting two capacitors in series to the crystal, such as 22pf and 8.2pf for 13.4mhz. but please note that the calculated c s -value includes all parasitic. 3.4 crystal frequency calculation as described in section 2.4.3 the operating range of the on-chip vco is wide enough to guarantee a receive frequency range between 400 and 440mhz. the vco signal is divided by 2 before applied to the mixer. this local oscillator signal can be used to downconvert the rf signals both with high- or low-side injection at the mixer. high-side c s crystal input impedance z 1-28 TDA7200 crst2 28 crst1 1 l l s x f c c 2 1 1 + = data sheet 23 v 1.0, 2007-05-02 TDA7200 applications injection of the local oscillator has to be used for receive frequencies between 400 and 420mhz. in this case the local oscillator frequency is calculated by adding the if frequency (10.7 mhz) to the rf frequency. thus the higher frequency of a fsk- modulated signal is demodulated as a logical zero (low). low-side injection has to be used for receive frequencies above 420 mhz. the local oscillator frequency is calculated by subtracting the if frequency (10.7 mhz) from the rf frequency then. in this case no sign-inversion occurs and the higher frequency of a fsk- modulated signal is demodulated as a logical one (high). the overall division ratio in the pll is 32. therefore the crystal frequency may be calculated by using the following formula: with ? rf receive frequency ? lo local oscillator (pll) frequency (? rf 10.7) ? qu quartz crystal oscillator frequency 32 ratio of local oscillator (pll) frequency and crystal frequency. this yields the following example: 3.5 data slicer threshold generation the threshold of the data slicer can be generated using an external r-c integrator as shown in figure 7 . the time constant t a of this circuit including also the internal resistors r f3int and r f4int (see figure 9 ) has to be significantly larger than the longest period of no signal change t l within the data sequence. in order to keep distortion low, the minimum value for r is 20k ? . 32 7 . 10 = rf qu f f mhz mhz mhz f qu 234375 . 13 32 7 . 10 2 . 434 = ? = TDA7200 applications data sheet 24 v 1.0, 2007-05-02 t a has to be calculated as r1, r f3 int , r f4 int and c13 see also figure 7 and figure 9 figure 7 data slicer threshold generation with external r-c integrator in case of ask operation another possibility for threshold generation is to use the peak detector in connection with an internal resistive divider and one capacitor as shown in figure 8 . for selecting the peak detector as reference for the slicing level a logic low as to be applied on the ssel pin. in case of msel is high (or open), which means that ask-mode is selected, a logic low on the ssel pin yields a logic high on the and-output and thus the peak-detector is selected (see figure 9 ). in case of fsk the msel-pin and furthermore the one input of the and-gate is low, so the peak detector can not be selected. the capacitor value is depending on the coding scheme and the protocol used. fsk for c v r r ii r c r r r r r t and ask for c r r ii r c r r r r r r t f f f f f a f f f f f f a ... 13 ) ( 1 13 1 1 ... 13 ) ( 1 13 1 ) ( 1 int 4 int 3 int 4 int 3 int 4 int 4 int 3 int 4 int 3 int 4 int 3 ? + = ? + + ? = ? + = ? + + + ? = 20 19 25 u threshold data slicer data filter cm data sheet 25 v 1.0, 2007-05-02 TDA7200 applications figure 8 data slicer threshold generation utilising the peak detector 3.6 ask/fsk-data path functional description the TDA7200 is containing an ask/fsk switch which can be controlled via pin 15 (msel). this switch is actually consisting of 2 operational amplifiers that are having a gain of 1 in case of the ask amplifier and a gain of 11 in case of the fsk amplifier in order to achieve an appropriate demodulation gain characteristic. in order to compensate for the dc-offset generated especially in case of the fsk pll demodulator there is a feedback connection between the threshold voltage of the bit slicer comparator (pin 20) to the negative input of the fsk switch amplifier. in ask-mode alternatively to the voltage at pin 20 (sln) a value of approx. 87% of the peak-detector output-voltage at pin 26 (pdo) can be used as the slicer-reference level. the slicing reference level is generated by an internal voltage divider (r t1int , r t2int ), which is applied on the peak detector output. the selection between these modes is controlled by pin 16 (ssel), as described in section 3.5 . this is shown in figure 9 . pins: 25 u threshold data slicer 26 peak detector c 56k cp 390k TDA7200 applications data sheet 26 v 1.0, 2007-05-02 figure 9 ask/fsk mode datapath 3.7 fsk mode the fsk datapath has a bandpass characterisitc due to the feedback shown above (highpass) and the data filter (lowpass). the lower cutoff frequency f2 is determined by the external rc-combination. the upper cutoff frequency f3 is determined by the data filter bandwidth. the demodulation gain of the fsk pll demodulator is 200v/khz. this gain is increased by the gain v of the fsk switch, which is 11. therefore the resulting dynamic gain of this circuit is 2.2mv/khz within the bandpass. the gain for the dc content of fsk signal remains at 200v/khz. the cut-off frequencies of the bandpass have to be chosen such that the spectrum of the data signal is influenced in an acceptable amount. in case that the user data is containing long sequences of logical zeroes the effect of the drift-off of the bit slicer threshold voltage can be lowered if the offset voltage inherent at the negative input of the slicer comparator (pin20) is used. the comparator has no hysteresis built in. this offset voltage is generated by the bias current of the negative input of the comparator (i.e. 20na) running over the external resistor r. this voltage raises the voltage appearing at pin 20 (e.g. 1mv with r = 100k ? ). in order to obtain benefit of this r f1 int r f2 int v = 1 19 21 22 20 30k 300k data out ac dc typ. 2 v 1.5 v......2.5 v 0.18 mv/khz from rssi gen (ask signal) c14 c12 r1 c13 + - - + ask fsk comp 25 pdo 26 390k r t1 int 16 15 msel + - - + cp cm 1 h=ask l=fsk h=cp l=cm ssel detector peak slp oop ffb sln fsk pll demodulator data filter ask mode: v=1 fsk mode: v=11 ask/fsk switch 100nf c15 56k r t2 100k 100k r f3 int r f4 int data sheet 27 v 1.0, 2007-05-02 TDA7200 applications asymmetrical offset for the demodulation of long zeros the lower of the two fsk frequencies should be chosen in the transmitter as the zero-symbol frequency. in the following figure the shape of the above mentioned bandpass is shown. figure 10 frequency characteristic in case of fsk mode the cutoff frequencies are calculated with the following formulas: f 3 is the 3db cutoff frequency of the data filter - see section 3.2 . example: r1 = 100k ?, c13 = 47nf this leads tof 1 = 44hz and f 2 = 485hz v 0db 3db v-3db f 20db/dec -40db/dec f1 f2 f3 gain (pin19) dc 0.18mv/khz 2mv/khz 13 330 1 330 1 2 1 1 c k r k r f ? + ? = 1 1 2 11 f f v f = = db f f 3 3 = TDA7200 applications data sheet 28 v 1.0, 2007-05-02 3.8 ask mode in case the receiver is operated in ask mode the datapath frequency charactersitic is dominated by the data filter alone, thus it is lowpass shaped. the cutoff frequency is determined by the external capacitors c 12 and c 14 and the internal 100k resistors as described in section 3.2 figure 11 frequency characteristic in case of ask mode 3.9 principle of the precharge circuit in case the data slicer threshold shall be generated with an external rc network as described in section 3.5 it is necessary to use large values for the capacitor c attached to the sln pin (pin 20) in order to achieve long time constants. this results also from the fact that the choice of the value for r1 connected between the slp and sln pins (pins 19 and 20) is limited by the 330k ? resistor appearing in parallel to r1 as can be seen in figure 9 . apart from this a resistor value of 100k ? leads to a voltage offset of 1mv at the comparator input. the resulting startup time constant 1 can be calculated with: in case r1 is chosen to be 100k ? and c13 is chosen as 47nf this leads to when the device is turned on this time constant dominates the time necessary for the device to be able to demodulate data properly. in the powerdown mode the capacitor is only discharged by leakage currents. 0db -3db f -40db/dec f3db ( ) 13 330 || 1 1 c k r ? = () ms nf k nf k k 6 . 3 47 77 47 330 || 100 1 = ? = ? ? = data sheet 29 v 1.0, 2007-05-02 TDA7200 applications in order to reduce the turn-on time in the presence of large values of c a precharge circuit was included in the TDA7200 as shown in the following figure. figure 12 principle of the precharge circuit this circuit charges the capacitor c13 with an inrush current i load of typically 220a for a duration of t 2 until the voltage u c appearing on the capacitor is equal to the voltage u s at the input of the data filter. this voltage is limited to 2.5v. as soon as these voltages are equal or the duration t 2 is exceeded the precharge circuit is disabled. 2 is the time constant of the charging process of c18 which can be calculated as as the sum of r4 and r5 is sufficiently large and thus can be neglected. t 2 can then be calculated according to the following formula: i load +3.1v 20k + - ota +2.4v r4 r5 24 23 u threshold c13 0 / 240ua + - 20 19 r1 data filter ask/fsk switch c18 u2 us uc uc TDA7200 applications data sheet 30 v 1.0, 2007-05-02 the voltage transient during the charging of c 2 is shown in the following figure: figure 13 voltage appearing on c18 during precharging process the voltage appearing on the capacitor c13 connected to pin 20 is shown in the following figure. it can be seen that due to the fact that it is charged by a constant current source it exhibits is a linear increase in voltage which is limited to u smax = 2.5v which is also the approximate operating point of the data filter input. the time constant appearing in this case can be denoted as t 3 , which can be calculated with: u2 2 3v 2.4v t2 13 220 5 . 2 220 13 max 3 c a v a c u t s = = data sheet 31 v 1.0, 2007-05-02 TDA7200 applications figure 14 voltage transient on capacitor c13 attached to pin 20 as an example the choice of c18 = 22nf and c13 = 47nf yields 2 = 0.44ms t 2 = 0.71ms t 3 = 0.53ms this means that in this case the inrush current could flow for a duration of 0.64ms but stops already after 0.49ms when the u smax limit has been reached. t 3 should always be chosen to be shorter than t 2 . it has to be noted finally that during the turn-on duration t 2 the overall device power consumption is increased by the 220a needed to charge c13. the precharge circuit may be disabled if c18 is not equipped. this yields a t 2 close to zero. note that the sum of r 4 and r 5 has to be 600k ? in order to produce 3v at the thres pin as this voltage is internally used also as the reference for the fsk demodulator. us t3 uc TDA7200 reference data sheet 32 v 1.0, 2007-05-02 4 reference 4.1 electrical data 4.1.1 absolute maximum ratings attention: the maximum ratings may not be exceeded under any circumstances, not even momentarily and individually, as permanent damage to the ic will result. the ac/dc characteristic limits are not guaranteed. table 6 absolute maximum ratings, t amb = -20 c ? +70 c 4.1.2 operating range within the operational range the ic operates as explained in the circuit description. currents flowing into the device are denoted as positive currents and vice versa. the device parameters with are not part of the production test, but either verified by design or measured in the infineon evalboard as described in section 4.2 . supply voltage: vcc = 4.5v .. 5.5v # parameter symbol limit values unit remarks min. max. 1 supply voltage v s -0.3 5.5 v 2 junction temperature t j -40 +125 c 3 storage temperature t s -40 +150 c 4 thermal resistance r thja 114 k/w 5 esd integrity, all pins excl. pins 1,3, 6, 28 esd integrity pins 1,3,6,28 v esd +2 +1.5 kv kv hbm according to mil std 883d, method 3015.7 data sheet 33 v 1.0, 2007-05-02 TDA7200 reference table 7 operating range, t amb = -20 c ? +70 c not part of the production test - either verified by design or measured in the infineon evalboard as described in section 4.2 . 4.1.3 ac/dc characteristics at t amb = 25 c ac/dc characteristics involve the spread of values guaranteed within the specified voltage and ambient temperature range. typical characteristics are the median of the production. currents flowing into the device are denoted as po-sitive currents and vice versa. the device performance parameters marked with are not part of the production test - either verified by design or measured in the infineon evalboard as described in section 4.2 . # parameter symbol limit values unit test conditions/ notes l min. max. 1 supply current i sf i sa 3.7 3.0 7.7 7.0 ma ma fsk mode ask mode 2 receiver input level ask fsk, frequ. dev. 50khz rf in -106 -100 -13 -13 dbm dbm @source impedance 50 ? ber 2e-3, average power level, manchester encoded datarate 4kbit, 280khz if bandwidth 3 lni input frequency f rf 400 440 mhz 4 mi/x input frequency f mi 400 440 mhz 5 3db if frequency range ask fsk f if -3db 5 10.4 23 11 mhz 6 powerdown mode on pwdn on 2v s v 7 powerdown mode off pwdn off 00.8v 8 gain control voltage, lna high gain state v thres 2.8 v s -1 v 9 gain control voltage, lna low gain state v thres 00.7v TDA7200 reference data sheet 34 v 1.0, 2007-05-02 table 8 ac/dc characteristics with t a 25c, v cc =4.5 ... 5.5 v # parameter symbol limit values unit test conditions/ notes l min. typ. max. supply supply current 1 supply current, standby mode i s pdwn 50 100 na pin 27 (pdwn) open or tied to 0 v 2 supply current, device operating, fsk mode i sa 4.9 5.7 6.5 ma pin 15 (msel) tied to gnd 3 supply current, device operating, ask mode i sa 4.2 5 5.8 ma pin 15 (msel) open lna signal input lni (pin 3), v thres >2.8v, high gain mode 1 average power level at ber = 2e-3 (sensitivity) rf in -110 dbm manchester encoded datarate 4kbit, 280khz if bandwidth 2 average power level at ber = 2e-3 (sensitivity) fsk rf in -103 dbm manchester enc. datarate 4kbit, 280khz if bandw., 50khz pk. dev. 3 input impedance f rf = 434 mhz s 11 lna 0.873 / -34.7 deg 4 input level @ 1db compression p1db lna -15 dbm 5 input 3 rd order intercept point f rf = 434 mhz iip3 lna -10 dbm matched input 6 lo signal feedthrough at antenna port lo lni -73 dbm signal output lno (pin 6), v thres >2.8v, high gain mode 1 gain f rf = 434 mhz s 21 lna 1.509/ 138.2 deg 2 output impedance, f rf = 434 mhz s 22 lna 0.886 / -12.9 deg 3 voltage gain antenna to ifo f rf = 434 mhz g antmixer-out 42 db data sheet 35 v 1.0, 2007-05-02 TDA7200 reference signal input lni, v thres =gnd, lwo gain mode 1 input impedance, f rf = 434 mhz s 11 lna 0.873 / -34.7 deg 2 input level @ 1db c. p. f rf = 434 mhz p1db lna -18 dbm matched input 3 input 3 rd order intercept point f rf = 434 mhz iip3 lna -10 dbm matched input signal output lno, v thres =gnd, lwo gain mode 1 gain f rf = 434 mhz s 21 lna 0.183 / 140.6 deg 2 output impedance, f rf = 434 mhz s 22 lna 0.897 / -13.6 deg 3 voltage gain antenna to ifo f rf = 434 mhz g antmixer-out 22 db signal 3vout (pin 24) 1 output voltage v 3vout 2.9 3.1 3.3 v 3vout pin open 2 current out i 3vout -3 -5 -10 a see section 4.1 signal thres (pin 23) 1 input voltage range v thres 0v s -1 v see section 4.1 2 lna low gain mode v thres 0v 3 lna high gain mode v thres 3v s -1 v or shorted to pin 24 4 current in i thres_in 5na signal tagc (pin 4) 1 current out, lna low gain state i tagc_out -3.6 -4.2 -5.5 a rssi > v thres 2 current in, lna high gain state i tagc_in 1 1.5 2.2 a rssi < v thres mixer signal input mi/mix (pins 8/9) 1 input impedance, f rf = 434 mhz s 11 mix 0.942 / -14.4 deg 2 input 3 rd order intercept point f rf = 434 mhz iip3 mix -28 dbm # parameter symbol limit values unit test conditions/ notes l min. typ. max. TDA7200 reference data sheet 36 v 1.0, 2007-05-02 signal output ifo (pin 12) 1 output impedance z ifo 330 ? 2 conversion voltage gain f rf = 434 mhz g mix 19 db limiter signal input lim/x (pins 17/18) 1 input impedance z lim 264 330 396 ? 2 rssi dynamic range dr rssi 70 db 3 rssi linearity lin rssi 1db 4 operating frequency (3db points) f lim 5 10.7 23 mhz data filter 1 useable bandwidth bw bb filt 100 khz 2 rssi level at data filter output slp, rf in =-103dbm rssi low 1.1 v lna in high gain mode at 868 mhz 3 rssi level at data filter output slp, rf in =-30dbm rssi high 2.65 v lna in high gain mode at 868 mhz slicer signal output data (pin 25) 1 maximum datarate dr max 100 kbps nrz, 20pf capacitive loading 2 low output voltage v slic_l 00.1v 3 high output voltage v slic_h v s -1.3 v s -1 v s -0.7 v output current=200a slicer, negative input (pin 20) 1 precharge current out i pch_sln -100 -220 -300 a see section 4.2 . # parameter symbol limit values unit test conditions/ notes l min. typ. max. data sheet 37 v 1.0, 2007-05-02 TDA7200 reference peak detector signal output pdo (pin 26) 1 load current i load -500 a static load current must not exceed -500a 2 internal resistive load r 357 446 535 k ? crystal oscillator signals crstl 1, crstl 2 (pins 1/28) 1 operating frequency f crstl 6 14 mhz fundamental mode, series resonance 2 input impedance @ ~ 13mhz z 1-28 -600 + j 1010 ? 3 load capacitance @ ~ 13mhz c crstmax =c1 5.9 pf ask/fsk signal switch signal msel (pin 15) 1 ask mode v msel 1.4 4 v or open 2 fsk mode v msel 00.2v 3 input bias current msel i msel -11 19 a msel tied to gnd fsk demodulator 1 demodulation gain g fmdem 200 v/ khz 2 useable if bandwidth bw ifpll 10.2 10.7 11.2 mhz power down mode signal pdwn (pin 27) 1 powerdown mode on pwdn on 2.8 v s v 2 powerdown mode off pwdn off 00.8v # parameter symbol limit values unit test conditions/ notes l min. typ. max. TDA7200 reference data sheet 38 v 1.0, 2007-05-02 not part of the production test - either verified by design or measured in the infineon evalboard as described in section 4.2 . 4.1.4 ac/dc characteristics at t amb = -20c ... +70c currents flowing into the device are denoted as positive currents and vice versa. table 9 ac/dc characteristics with t amb = -20c ...+70c, v cc = 4.5 ... 5.5 v 3 input bias current pdwn i pdwn 19 a power on mode 4 start-up time until valid if signal is detected t su <1 ms depends on the used crystal data-slicer reference-level signal ssel (pin 16), ask-mode 1 slicer-reference is voltage at pin 20 (sln) v ssel 1.4 4 v or open 2 slicer-reference is approx. 87% of the voltage at pin 26 (pdo) v ssel 00.2v 3 input bias current ssel i ssel -10 -19 a ssel tied to gnd # parameter symbol limit values unit test conditions/ notes min. typ. max. supply supply current 1 supply current, standby mode i s pdwn 50 400 na pin 27 (pdwn) open or tied to 0 v 2 supply current, device operating in fsk mode i sa 3.7 5.7 7.7 ma pin 15 (msel) tied to gnd # parameter symbol limit values unit test conditions/ notes l min. typ. max. data sheet 39 v 1.0, 2007-05-02 TDA7200 reference 5 supply current, device operating in ask mode i sa 3 5 7 ma pin 15 (msel) open signal input 3vout (pin 24) 1 output voltage v 3vout 2.9 3.1 3.3 v 3vout pin open 2 current out i 3vout -3 -5 -10 a see section 4.1 signal thres (pin 23) 1 input voltage range v thres 0v s -1 v see section 4.1 2 lna low gain mode v thres 0v 3 lna high gain mode v thres 3v s -1 v or shorted to pin 24 4 current in i thres_in 5na signal tagc (pin 4) 1 current out, lna low gain state i tagc_out -1 -4.2 -8 a rssi > v thres 2 current in, lna high gain state i tagc_in 0.5 1.5 5 a rssi < v thres mixer 1 conversion voltage gain f rf = 434 mhz g mix +19 db 2 conversion voltage gain f rf = 868 mhz g mix +18 db limiter signal input lim/x (pins 17/18) 1 rssi dynamic range dr rssi 70 db data filter 1 rssi level at data filter output slp, rf in = -103dbm rssi low 1.1 v lna in high gain mode at 868 mhz 2 rssi level at data filter output slp, rf in = -30dbm rssi high 2.65 v lna in high gain mode at 868 mhz # parameter symbol limit values unit test conditions/ notes min. typ. max. TDA7200 reference data sheet 40 v 1.0, 2007-05-02 slicer slicer, signal output data (pin 25) 1 maximum datarate dr max 100 kbps nrz, 20pf capacitive loading 2 low output voltage v slic_l 00.1v 3 high output voltage v slic_h v s - 1.5 v s -1 v s - 0.5 v output current=200a slicer, negative input (pin 20) 1 precharge current out i pch_sln -100 -220 -300 a see section 4.2 peak detector signal output pdo (pin 26) 1 load current i load -400 a static load current must not exceed -500a 2 internal resistive load r 356 446 575 k ? crystal oscillator signals crstl 1, crstl 2 (pins 1/28) 1 operating frequency f crstl 6 14 mhz fundamental mode, series resonance ask/fsk signal switch signal msel (pin 15) 1 ask mode v msel 1.4 4 v or open 2 fsk mode v msel 00.2v 3 input bias current msel i msel -11 -20 a msel tied to gnd # parameter symbol limit values unit test conditions/ notes min. typ. max. data sheet 41 v 1.0, 2007-05-02 TDA7200 reference not part of the production test - either verified by design or measured in the infineon evalboard as described in section 4.2 . fsk demodulator 1 demodulation gain g fmdem 200 v/ khz 2 useable if bandwidth bw ifpll 10.2 10.7 11.2 mhz power down mode signal pdwn (pin 27) 1 powerdown mode on pwdn on 2.8 v s v 2 powerdown mode off pwdn off 00.8v 3 start-up time until valid signal is detected at if t su <1 ms depends on the used crystal data-slicer reference-level signal ssel (pin 16), ask-mode 1 slicer-reference is voltage at pin 20 (sln) v ssel 1.4 4 v or open 2 slicer-reference is approx. 87% of the voltage at pin 26 (pdo) v ssel 00.2v 3 input bias current ssel i ssel -11 -20 a ssel tied to gnd # parameter symbol limit values unit test conditions/ notes min. typ. max. TDA7200 reference data sheet 42 v 1.0, 2007-05-02 4.2 test circuit the device performance parameters marked with in section 4.1 were either verified by design or measured on an infineon evaluation board. this evaluation board can be obtained together with evaluation boards of the accompanying transmitter device tda7100 in an evaluation kit that may be ordered on the infineon webpage www.infineon.com/products. more information on the kit is available on request. figure 15 schematic of the evaluation board data sheet 43 v 1.0, 2007-05-02 TDA7200 reference 4.3 test board layouts figure 16 top side of the evaluation board figure 17 bottom side of the evaluation board TDA7200 reference data sheet 44 v 1.0, 2007-05-02 figure 18 component placement on the evaluation board 4.4 bill of materials the following components are necessary for evaluation of the TDA7200. table 10 bill of materials (cont?d) ref. value specification c1 1pf 0805, cog, +/-0.1pf c2 4.7pf 0805, cog, +/-0.1pf c3 6.8pf 0805, cog, +/-0.1pf c4 100pf 0805, cog, +/-5% c5 47nf 1206, x7r, +/-10% c6 10nh toko, ptl2012-f10n0g c7 100pf 0805, cog, +/-5% c8 33pf 0805, cog, +/-5% c9 100pf 0805, cog, +/-5% c10 10nf 0805, x7r, +/-10% c11 10nf 0805, x7r, +/-10% data sheet 45 v 1.0, 2007-05-02 TDA7200 reference please note that a capacitor has to be soldered in place l2 and an inductor in place c6. c12 220pf 0805, cog, +/-5% c13 47nf 0805, x7r, +/-10% c14 470pf 0805, cog, +/-5% c15 47nf 0805, cog, +/-5% c16 8.2pf 0805, cog, +/-0.1pf c17 18pf 0805, cog, +/-1% c18 22nf 0805, x7r, +/-5% c21 100nf 1206, x7r, +/-10% ic1 TDA7200 infineon l1 15nh toko, ptl2012-f15n0g l2 8.2pf 0805, cog, +/-0.1pf q1 13.234375 mhz 1053-922 q2 sfe_10.7ma5-a murata r1 100k ? 0805, +/-5% r4 240k ? 0805, +/-5% r5 360k ? 0805, +/-5% r6 10k ? 0805, +/-5% s1 stl_2pol 2-pole pin connector s2 sol_jump sol_jump s3 sol_jump sol_jump s6 sol_jump sol_jump x1 stl_2pol 2-pole pin connector x2 a107-900a (1.6mm gold plated) input output enterprise corp x3 a107-900a (1.6mm gold plated) input output enterprise corp ref. value specification TDA7200 package outlines data sheet 46 v 1.0, 2004-01-20 5 package outlines figure 19 pg-tssop-28 package outlines you can find all of our packages, sorts of packing and others in our infineon internet page ?products?: http://www.infineon.com/products . dimensions in mm smd = surface mounted device TDA7200 list of tables page data sheet 47 v 1.0, 2007-05-02 table 1 order information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 2 pin defintion and function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 table 3 msel pin operating states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 table 4 ssel pin operating states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 table 5 pdwn pin operating states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 table 6 absolute maximum ratings, t amb = -20 c ? +70 c . . . . . . . . . . . . . 32 table 7 operating range, t amb = -20 c ? +70 c . . . . . . . . . . . . . . . . . . . . . 33 table 8 ac/dc characteristics with t a 25c, v cc =4.5 ... 5.5 v . . . . . . . . . . . . 34 table 9 ac/dc characteristics with t amb = -20c ...+70c, v cc = 4.5 ... 5.5 v 38 table 10 bill of materials. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 TDA7200 list of figures page data sheet 48 v 1.0, 2007-05-02 figure 1 pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 2 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 3 lna automatic gain control circuity . . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 4 rssi level and permissive agc threshold levels . . . . . . . . . . . . . . 20 figure 5 data filter design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 figure 6 determination of series capacitance vale for the quartz oscillator . . 22 figure 7 data slicer threshold generation with external r-c integrator . . . . . 24 figure 8 data slicer threshold generation utilising the peak detector . . . . . . 25 figure 9 ask/fsk mode datapath. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 figure 10 frequency characteristic in case of fsk mode . . . . . . . . . . . . . . . . . . 27 figure 11 frequency characteristic in case of ask mode . . . . . . . . . . . . . . . . . . 28 figure 12 principle of the precharge circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 figure 13 voltage appearing on c18 during precharging process. . . . . . . . . . . . 30 figure 14 voltage transient on capacitor c13 attached to pin 20 . . . . . . . . . . . . 31 figure 15 schematic of the evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . . 42 figure 16 top side of the evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43 figure 17 bottom side of the evaluation board . . . . . . . . . . . . . . . . . . . . . . . . . . 43 figure 18 component placement on the evaluation board . . . . . . . . . . . . . . . . . 44 figure 19 pg-tssop-28 package outlines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46 www.infineon.com published by infineon technologies ag |
Price & Availability of TDA7200
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |