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TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control rev. 01 01 march 2002 product data m3d541 1. general description the TDA8944AJ is a dual-channel audio power ampli?er with dc gain control. it has an output power of 2 7 w at an 8 w load and a 12 v supply. the circuit contains two bridge-tied load (btl) ampli?ers with an all-npn output stage and standby/mute logic. the overall gain can be adjusted from +30 db down to - 50 db using a dc control voltage. this feature can be used for volume control or a preset gain. the TDA8944AJ comes in a 17-pin dil-bent-sil (dbs) power package and is pin compatible with the tda8944j. 2. features n gain/volume adjustment via a dc control pin n soft clipping n operating at a low supply voltage n standby and mute mode n no on/off switching plops n low standby current n high supply voltage ripple rejection n outputs short-circuit protected to ground, supply and across the load n thermally protected n printed-circuit board compatible with tda8946aj and tda8580j. 3. applications n mains fed applications (e.g. tv sound) n pc audio n portable audio. 4. quick reference data table 1: quick reference data symbol parameter conditions min typ max unit v cc supply voltage 4.5 12 18 v i q quiescent supply current v cc =12v; r l = - 4050ma i stb standby supply current - - 10 m a p o output power thd = 10%; r l =8 w ; v cc =12v 6 7 - w thd total harmonic distortion p o =1w - 0.07 0.5 %
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 2 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. 5. ordering information 6. block diagram g v(max) maximum voltage gain 29 30 31 db g v(cr) voltage gain control range - 80 - db svrr supply voltage ripple rejection - 55 - db table 1: quick reference data continued symbol parameter conditions min typ max unit table 2: ordering information type number package name description version TDA8944AJ dbs17p plastic dil-bent-sil power package; 17 leads (lead length 12 mm) sot243-1 fig 1. block diagram. i dth mgw587 standby/ mute logic short circuit and temperature protection 20 k w 20 k w 9 12 17 14 10 11 v cc1 v cc 2 3 out2 + gnd1 7 sgnd 15 gnd2 svr out2 - in2 - in2 + 8 TDA8944AJ 6 4 1 v cc2 16 out1 + out1 - in1 - in1 + mode 13 gc
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 3 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. 7. pinning information 7.1 pinning 7.2 pin description fig 2. pin con?guration. handbook, halfpage TDA8944AJ mgw588 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 out1 - gnd1 v cc1 out1 + n.c. in1 + sgnd in1 - in2 - mode svr in2 + gc out2 + gnd2 v cc2 out2 - table 3: pin description symbol pin description out1 - 1 negative loudspeaker terminal 1 gnd1 2 ground channel 1 v cc1 3 supply voltage channel 1 out1 + 4 positive loudspeaker terminal 1 n.c. 5 not connected in1 + 6 positive input 1 sgnd 7 signal ground in1 - 8 negative input 1 in2 - 9 negative input 2 mode 10 mode selection input (standby, mute, operating) svr 11 half supply voltage decoupling (ripple rejection) in2 + 12 positive input 2
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 4 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. 8. functional description the TDA8944AJ is a stereo btl audio power ampli?er capable of delivering 2 7w output power to an 8 w load at thd = 10%, using a 12 v power supply and an external heatsink. the gain of both ampli?ers can be adjusted through a dc control voltage (pin gc). this feature can be used for volume control or a preset gain. with the three-level mode input the device can be switched from standby to mute and to operating mode. the TDA8944AJ outputs are protected by an internal thermal shutdown protection mechanism and a short-circuit protection. 8.1 input con?guration the TDA8944AJ inputs can be driven symmetrical (?oating) as well as asymmetrical. in the asymmetrical mode one input pin is connected via a capacitor to the signal source and the other input is connected to the signal ground. this signal ground should be as close as possible to the svr (electrolytic) capacitor ground. note that the dc level of the input pins is half of the supply voltage v cc , so coupling capacitors for both pins are necessary. gc 13 dc gain control out2 - 14 negative loudspeaker terminal 2 gnd2 15 ground channel 2 v cc2 16 supply voltage channel 2 out2 + 17 positive loudspeaker terminal 2 table 3: pin description continued symbol pin description fig 3. asymmetrical input con?guration. handbook, halfpage mgw589 power ground signal ground signal source in + in - svr v cc
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 5 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. the input cut-off frequency is: (1) for r i = 32 k w and c i = 220 nf: (2) as shown in equation 2 , large capacitors values for the inputs are not necessary; so the switch-on delay during charging of the input capacitors can be minimized. this results in a good low frequency response and good switch-on behaviour. remark: to prevent high frequency oscillations do not leave the inputs open, connect a capacitor of 4.7 nf across the input pins close to the device (see figure 15 ). 8.2 power ampli?er the power ampli?er is a bridge-tied load (btl) ampli?er with an all-npn output stage, capable of delivering a peak output current of 2 a. the btl principle offers the following advantages: ? lower peak value of the supply current ? the ripple frequency on the supply voltage is twice the signal frequency ? no expensive dc-blocking capacitor ? good low frequency performance. 8.2.1 output power measurement the output power as a function of the supply voltage is measured on the output pins at thd = 10%; see figure 10 . the maximum output power is limited by the supply voltage of 12 v and the maximum available output current: 2 a repetitive peak current. 8.2.2 headroom typical cd music requires at least 12 db (factor 15.85) dynamic headroom - compared to the average power output - for transferring the loudest parts without distortion. at v cc =12v, r l =8 w and p o = 4 w at thd = 0.2% (see figure 8 ), the average listening level (all) - music power - without any distortion yields: (3) the power dissipation can be derived from figure 12 on page 11 for 0 db respectively 12 db headroom. f i cut off C () 1 2 p 0.5 r i c i () ------------------------------------------ = f i cut off C () 1 2 p 0.5 32 10 3 220 10 9 C () ------------------------------------------------------------------------------ 45.2 hz == p oall () 4 w 15.85 ------------- 252.4 =mw =
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 6 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. for the average listening level a power dissipation of 4 w can be used for a heatsink calculation. 8.3 mode selection the TDA8944AJ has three functional modes, which can be selected by applying the proper dc voltage to pin mode. standby in this mode the current consumption is very low and the outputs are ?oating. the device is in standby mode when v mode >(v cc - 0.5 v), or when the mode pin is left ?oating. mute in this mode the ampli?er is dc-biased but not operational (no audio output). this allows the input coupling capacitors to be charged to avoid pop-noise. the device is in mute mode when 3. 5v philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 7 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. 8.6 built-in protection circuits the TDA8944AJ contains two types of protection circuits, i.e. short-circuit and thermal shutdown. 8.6.1 short-circuit protection short-circuit to ground or supply line this is detected by a so-called missing current detection circuit which measures the current in the positive supply line and the current in the ground line. a difference between both currents larger than 0.8 a, switches the power stage to the standby mode; high impedance of the outputs and very low supply current. short-circuit across the load this is detected by an absolute-current measurement. an absolute-current larger than 2 a, switches the power stage to standby mode; high impedance of the outputs and a very low supply current. 8.6.2 thermal shutdown protection the junction temperature is measured by a temperature sensor; at a junction temperature of approximately 150 c this detection circuit switches the power stage to the standby mode; high impedance of the outputs and very low supply current. 9. limiting values 10. thermal characteristics table 5: limiting values in accordance with the absolute maximum rating system (iec 60134). symbol parameter conditions min max unit v cc supply voltage no signal - 0.3 +25 v operating - 0.3 +18 v v i input voltage - 0.3 v cc + 0.3 v i orm repetitive peak output current - 2 a t stg storage temperature non-operating - 55 +150 c t amb operating ambient temperature - 40 +85 c p tot total power dissipation - 18 w v cc(sc) supply voltage to guarantee short-circuit protection -15v table 6: thermal characteristics symbol parameter conditions value unit r th(j-a) thermal resistance from junction to ambient in free air 40 k/w r th(j-mb) thermal resistance from junction to mounting base both channels driven 4.5 k/w
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 8 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. 11. static characteristics [1] with a load connected at the outputs the quiescent current will increase, the maximum of this increase being equal to the di fferential output voltage offset (d v out ) divided by the load resistance (r l ). [2] the dc output voltage with respect to ground is approximately 0.5v cc . [3] d v out = ? v out+ - v out - ? . table 7: static characteristics v cc =12v; t amb =25 c; r l =8 w ; v mode =0v; v i = 0 v; measured in test circuit figure 15 ; unless otherwise speci?ed. symbol parameter conditions min typ max unit v cc supply voltage operating 4.5 12 18 v i q quiescent supply current r l = [1] -4050ma i stb standby supply current v mode =v cc --10 m a v o dc output voltage [2] -6-v d v out [3] differential output voltage offset - - 170 mv v mode mode selection input voltage operating mode 0 - 1.0 v mute mode 3.5 - v cc - 1.5 v standby mode v cc - 0.5 - v cc v i mode mode selection input current 0 < v mode philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 9 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. 12. dynamic characteristics [1] the noise output voltage is measured at the output in a frequency range from 20 hz to 20 khz (unweighted), with a source impedan ce r source =0 w at the input. [2] supply voltage ripple rejection is measured at the output, with a source impedance r source =0 w at the input. the ripple voltage is a sine wave with a frequency f ripple and an amplitude of 700 mv (rms), which is applied to the positive supply rail. [3] output voltage in mute mode is measured with v gc = 0 v and an input voltage of 1 v (rms) in a bandwidth of 20 khz, thus including noise. table 8: dynamic characteristics v cc =12v; t amb =25 c; r l =8 w ; f = 1 khz; v mode =0v; g v = 30 db; v gc = 4.0 v; measured in test circuit figure 15 ; unless otherwise speci?ed. symbol parameter conditions min typ max unit p o output power thd = 10% 6 7 - w thd = 0.5% - 5 - w thd total harmonic distortion p o = 1 w - 0.07 0.5 % g v(max) maximum voltage gain 29 30 31 db g v(cr) gain control range 0.5 < v gc < 4.0 v - 80 - db v i(rms) input voltage (rms value) g v = 0 db; thd <1% 1.0 - - v z i(dif) differential input impedance 50 65 - k w v n(o) noise output voltage v gc = 4.0 v [1] - 120 150 m v v gc = 1.0 v [1] -30- m v svrr supply voltage ripple rejection f ripple = 1 khz [2] -55-db f ripple = 100 hz to 20 khz [2] -55-db v o(mute) output voltage mute mode [3] -3050 m v a cs channel separation r source =0 w 50 75 - db |d g v | channel unbalance g v = 0 db; v gc = 1.8 v - - 1 db v cc =12v v i =30mv; v cc =12v fig 6. voltage gain as function of control voltage. fig 7. output voltage as function of mode voltage. handbook, halfpage 02 134 v gc (v) g v (db) 40 - 20 20 0 - 60 - 80 - 40 mgw592 handbook, halfpage v mode (v) v o (v) 04812 mgw593 10 1 10 - 1 10 - 2 10 - 3 10 - 4 10 - 5
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 10 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. v cc =12v v cc = 12 v; no bandpass ?lter applied (1) p o = 0.1 w (2) p o =1w fig 8. total harmonic distortion as function of output power. fig 9. total harmonic distortion as function of frequency. r l =8 w (1) thd = 10% (2) thd = 1% r l =8 w fig 10. output power as function of supply voltage. fig 11. total power dissipation (worst-case) as function of supply voltage. handbook, halfpage mgw594 p o (w) 10 - 2 10 - 1 11010 2 10 1 10 - 1 thd (%) 10 2 10 - 2 handbook, halfpage mgw595 f (hz) 10 10 2 10 3 10 4 10 5 thd (%) 10 1 10 - 1 10 - 2 (2) (1) handbook, halfpage p o (w) 012 41620 v cc (v) 8 0 16 12 4 8 mgw596 (2) (1) handbook, halfpage p tot (w) 012 41620 v cc (v) 8 0 20 12 16 4 8 mgw597
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 11 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. v cc = 12 v; r l =8 w v cc = 12 v; no bandpass ?lter applied fig 12. power dissipation as function of output power. fig 13. channel separation as function of frequency. v cc =12v; r source =0 w ; v ripple = 707 mv (rms); a bandpass ?lter of 10 hz to 80 khz has been applied. curve a: inputs short-circuited curve b: inputs short-circuited and connected to ground. fig 14. supply voltage ripple rejection as function of frequency. handbook, halfpage p (w) 06 2810 p o (w) 4 0 10 6 8 2 4 mgw598 handbook, halfpage mgw599 a cs (db) - 80 - 100 - 60 - 20 - 40 0 f (hz) 10 10 2 10 3 10 4 10 5 handbook, halfpage mgw600 svrr (hz) - 80 - 100 - 60 - 20 - 40 0 f (hz) 10 b a 10 2 10 3 10 4 10 5
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 12 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. 13. internal circuitry table 9: internal circuitry pin symbol equivalent circuit 6 and 8 in1+ and in1 - 12 and 9 in2+ and in2 - 1 and 4 out1 - and out1+ 14 and 17 out2 - and out2+ 10 mode h andbook, halfpage 3 k w 3 k w 32 k w 32 k w v cc v cc v cc mgw601 1/2 v cc (svr) 8, 9 6, 12 h andbook, halfpage v cc 1/2 v cc 100 w 600 w mgw602 1, 4, 14, 17 h andbook, halfpage v cc 1 k w 1 k w v cc off high mute high v cc mgw603 10
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 13 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. 11 svr 13 gc table 9: internal circuitry continued pin symbol equivalent circuit h andbook, halfpage v cc standby 17.6 k w 17.6 k w v cc mgw604 11 h andbook, halfpage 2.5 k w 736 w v cc mgw605 5.65 k w 2.75 v 13 1 : 1
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 14 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. 14. application information 14.1 printed-circuit board 14.1.1 layout and grounding for a high system performance level certain grounding techniques are essential. the input reference grounds have to be tied with their respective source grounds and must have separate tracks from the power ground tracks; this will prevent the large (output) signal currents from interfering with the small ac input signals. the small-signal ground tracks should be physically located as far as possible from the power ground tracks. supply and output tracks should be as wide as possible for delivering maximum output power. (1) to prevent high frequency oscillations do not leave the inputs open, connect a capacitor of 4.7 nf across the input pins close to the device. fig 15. application diagram. handbook, full pagewidth 4 w 4 w 220 nf 220 nf mgw606 standby/ mute logic short circuit and temperature protection 20 k w 20 k w 9 12 17 14 10 11 v cc1 v cc 2 3 out2 + gnd1 7 sgnd 15 gnd2 svr out2 - in2 - in2 + 8 TDA8944AJ 6 4 1 v cc2 16 out1 + out1 - in1 - in1 + mode 13 gc v cc 1000 m f 100 nf microcontroller 10 m f r source 220 nf v i 220 nf 4.7 nf (1) r source 220 nf v i 220 nf or 4.7 nf (1) r l 8 w 4 w 4 w 220 nf 220 nf r l 8 w
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 15 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. 14.1.2 power supply decoupling proper supply bypassing is critical for low-noise performance and high supply voltage ripple rejection. the respective capacitor location should be as close as possible to the device and grounded to the power ground. proper power supply decoupling also prevents oscillations. for suppressing higher frequency transients (spikes) on the supply line a capacitor with low esr - typical 100 nf - has to be placed as close as possible to the device. for suppressing lower frequency noise and ripple signals, a large electrolytic capacitor - e.g. 1000 m f or greater - must be placed close to the device. the bypass capacitor on the svr pin reduces the noise and ripple on the midrail voltage. for good thd and noise performance a low esr capacitor is recommended. 14.2 thermal behaviour and heatsink calculation the measured maximum thermal resistance of the ic package, r th(j-mb) is 4.5 k/w. a calculation for the heatsink can be made, with the following parameters: t amb =50 c v cc = 12 v and r l =8 w t j(max) = 150 c r th(tot) is the total thermal resistance between the junction and the ambient including the heatsink. in the heatsink calculations the value of r th(mb-h) is ignored. fig 16. printed-circuit board layout (single-sided); components view. mgw607 100 nf 220 nf 220 nf 220 nf 220 nf 220 nf 220 nf 4.7 nf 1 1 4.7 nf 1000 m f 10 m f 4 w 4 w 4 w 4 w out1 - in2 - in2 + in1 - in1 + out1 + out2 - out2 + gc sgnd gnd v cc on mode svr
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 16 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. at v cc = 12 v and r l =8 w the measured worst-case sine-wave dissipation is 8 w; see figure 12 . for t j(max) = 150 c the temperature rise - caused by the power dissipation - is: 150 - 50 = 100 c. p r th(tot) = 100 c r th(tot) = 100/8 = 12.5 k/w r th(h-a) =r th(tot) - r th(j-mb) = 12.5 - 4.5 = 8.0 k/w. the calculation above is for an application at worst-case (stereo) sine-wave output signals. in practice music signals will be applied, which decreases the maximum power dissipation to approximately half of the sine-wave power dissipation (see section 8.2.2 ). this allows for the use of a smaller heatsink: p r th(tot) = 100 c r th(tot) = 100/(0.5 8)=25k/w r th(h-a) =r th(tot) - r th(j-mb) =25 - 4.5 = 20.5 k/w. to increase the lifetime of the ic, t j(max) should be reduced to 125 c. this requires a heatsink of approximately 14 k/w for music signals. 15. test information 15.1 quality information the general quality speci?cation for integrated circuits, snw-fq-611d is applicable (ordering code 9397 750 05459). 15.1.1 test conditions t amb =25 c; v cc = 12 v; f = 1 khz; r l =8 w ; audio pass band 22 hz to 22 khz; unless otherwise speci?ed. remark: in the graphs as function of frequency no bandpass ?lter was applied; see figure 9 and 13 .
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 17 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. 16. package outline fig 17. dbs17p package outline. references outline version european projection issue date iec jedec eiaj dimensions (mm are the original dimensions) note 1. plastic or metal protrusions of 0.25 mm maximum per side are not included. sot243-1 0 5 10 mm scale d l e a c a 2 l 3 q w m b p 1 d d z e e x h 117 j e h non-concave 97-12-16 99-12-17 dbs17p: plastic dil-bent-sil power package; 17 leads (lead length 12 mm) sot243-1 view b : mounting base side m 2 e v m b unit a e 1 a 2 b p cd (1) e (1) z (1) de d h ll 3 m mm 17.0 15.5 4.6 4.4 0.75 0.60 0.48 0.38 24.0 23.6 20.0 19.6 10 2.54 v 0.8 12.2 11.8 1.27 e 2 5.08 2.4 1.6 e h 6 2.00 1.45 2.1 1.8 3.4 3.1 4.3 12.4 11.0 q j 0.4 w 0.03 x
philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control product data rev. 01 01 march 2002 18 of 20 9397 750 09433 ? koninklijke philips electronics n.v. 2002. all rights reserved. 17. soldering 17.1 introduction to soldering through-hole mount packages this text gives a brief insight to wave, dip and manual soldering. a more in-depth account of soldering ics can be found in our data handbook ic26; integrated circuit packages (document order number 9398 652 90011). wave soldering is the preferred method for mounting of through-hole mount ic packages on a printed-circuit board. 17.2 soldering by dipping or by solder wave the maximum permissible temperature of the solder is 260 c; solder at this temperature must not be in contact with the joints for more than 5 seconds. the total contact time of successive solder waves must not exceed 5 seconds. the device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the speci?ed maximum storage temperature (t stg(max) ). if the printed-circuit board has been pre-heated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit. 17.3 manual soldering apply the soldering iron (24 v or less) to the lead(s) of the package, either below the seating plane or not more than 2 mm above it. if the temperature of the soldering iron bit is less than 300 c it may remain in contact for up to 10 seconds. if the bit temperature is between 300 and 400 c, contact may be up to 5 seconds. 17.4 package related soldering information [1] for sdip packages, the longitudinal axis must be parallel to the transport direction of the printed-circuit board. 18. revision history table 10: suitability of through-hole mount ic packages for dipping and wave soldering methods package soldering method dipping wave dbs, dip, hdip, sdip, sil suitable suitable [1] table 11: revision history rev date cpcn description 01 20020301 - product data (9397 750 09433)
9397 750 09433 philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control ? koninklijke philips electronics n.v. 2002. all rights reserved. product data rev. 01 01 march 2002 19 of 20 contact information for additional information, please visit http://www.semiconductors.philips.com . for sales of?ce addresses, send e-mail to: sales.addresses@www.semiconductors.philips.com . fax: +31 40 27 24825 19. data sheet status [1] please consult the most recently issued data sheet before initiating or completing a design. [2] the product status of the device(s) described in this data sheet may have changed since this data sheet was published. the l atest information is available on the internet at url http://www.semiconductors.philips.com. 20. de?nitions short-form speci?cation the data in a short-form speci?cation is extracted from a full data sheet with the same type number and title. for detailed information see the relevant data sheet or data handbook. limiting values de?nition limiting values given are in accordance with the absolute maximum rating system (iec 60134). stress above one or more of the limiting values may cause permanent damage to the device. these are stress ratings only and operation of the device at these or at any other conditions above those given in the characteristics sections of the speci?cation is not implied. exposure to limiting values for extended periods may affect device reliability. application information applications that are described herein for any of these products are for illustrative purposes only. philips semiconductors make no representation or warranty that such applications will be suitable for the speci?ed use without further testing or modi?cation. 21. disclaimers life support these products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. philips semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify philips semiconductors for any damages resulting from such application. right to make changes philips semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. philips semiconductors assumes no responsibility or liability for the use of any of these products, conveys no licence or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise speci?ed. data sheet status [1] product status [2] de?nition objective data development this data sheet contains data from the objective speci?cation for product development. philips semiconductors reserves the right to change the speci?cation in any manner without notice. preliminary data quali?cation this data sheet contains data from the preliminary speci?cation. supplementary data will be publish ed at a later date. philips semiconductors reserves the right to change the speci?cation without notice, in order to improve the design and supply the best possible product. product data production this data sheet contains data from the product speci?cation. philips semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. changes will be communicated according to the customer product/process change noti?cation (cpcn) procedure snw-sq-650a.
? koninklijke philips electronics n.v. 2002. printed in the netherlands all rights are reserved. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. no liability will be accepted by the publisher for any consequence of its use. publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. date of release: 01 march 2002 document order number: 9397 750 09433 contents philips semiconductors TDA8944AJ 2 x 7 w btl audio ampli?er with dc gain control 1 general description . . . . . . . . . . . . . . . . . . . . . . 1 2 features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 4 quick reference data . . . . . . . . . . . . . . . . . . . . . 1 5 ordering information . . . . . . . . . . . . . . . . . . . . . 2 6 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 2 7 pinning information . . . . . . . . . . . . . . . . . . . . . . 3 7.1 pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 7.2 pin description . . . . . . . . . . . . . . . . . . . . . . . . . 3 8 functional description . . . . . . . . . . . . . . . . . . . 4 8.1 input con?guration . . . . . . . . . . . . . . . . . . . . . . 4 8.2 power ampli?er . . . . . . . . . . . . . . . . . . . . . . . . . 5 8.2.1 output power measurement . . . . . . . . . . . . . . . 5 8.2.2 headroom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 8.3 mode selection . . . . . . . . . . . . . . . . . . . . . . . . . 6 8.3.1 switch-on and switch-off. . . . . . . . . . . . . . . . . . 6 8.4 dc gain control . . . . . . . . . . . . . . . . . . . . . . . . . 6 8.5 supply voltage ripple rejection (svrr) . . . . . 6 8.6 built-in protection circuits . . . . . . . . . . . . . . . . . 7 8.6.1 short-circuit protection . . . . . . . . . . . . . . . . . . . 7 8.6.2 thermal shutdown protection . . . . . . . . . . . . . . 7 9 limiting values. . . . . . . . . . . . . . . . . . . . . . . . . . 7 10 thermal characteristics. . . . . . . . . . . . . . . . . . . 7 11 static characteristics. . . . . . . . . . . . . . . . . . . . . 8 12 dynamic characteristics . . . . . . . . . . . . . . . . . . 9 13 internal circuitry. . . . . . . . . . . . . . . . . . . . . . . . 12 14 application information. . . . . . . . . . . . . . . . . . 14 14.1 printed-circuit board . . . . . . . . . . . . . . . . . . . . 14 14.1.1 layout and grounding . . . . . . . . . . . . . . . . . . . 14 14.1.2 power supply decoupling . . . . . . . . . . . . . . . . 15 14.2 thermal behaviour and heatsink calculation . 15 15 test information . . . . . . . . . . . . . . . . . . . . . . . . 16 15.1 quality information . . . . . . . . . . . . . . . . . . . . . 16 15.1.1 test conditions . . . . . . . . . . . . . . . . . . . . . . . . 16 16 package outline . . . . . . . . . . . . . . . . . . . . . . . . 17 17 soldering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 17.1 introduction to soldering through-hole mount packages . . . . . . . . . . . . . . . . . . . . . . 18 17.2 soldering by dipping or by solder wave . . . . . 18 17.3 manual soldering . . . . . . . . . . . . . . . . . . . . . . 18 17.4 package related soldering information . . . . . . 18 18 revision history . . . . . . . . . . . . . . . . . . . . . . . . 18 19 data sheet status . . . . . . . . . . . . . . . . . . . . . . . 19 20 de?nitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 21 disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

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