Part Number Hot Search : 
37101 RFSW6024 DT74F MC68HC05 BD3433K C2140 B0000 AD9859
Product Description
Full Text Search
 

To Download MC145446 Datasheet File

  If you can't view the Datasheet, Please click here to try to view without PDF Reader .  
 
 


  Datasheet File OCR Text:
 MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Order this document by MC145446A/D
MC145446A
Product Preview Single-Chip 300-Baud Modem with DTMF Transceiver
The MC145446A is a silicon gate CMOS frequency shift keying (FSK) modem intended for use with telemeter systems or remote control systems over the telephone network. It replaces the MC145446. This device is compatible with CCITT V.21 and contains the entire circuit that provides a full-duplex or half-duplex 300-baud data communication over a pair of telephone lines. This device also includes the DTMF generator/receiver and call progress tone detector (CPTD). The differential line driver has the capability of driving 0 dBm into a 600 load with a single 5 V power supply. The transmit level is controlled by the programmable attenuator in 1 dB steps. This device also includes a serial control interface and internal control and status registers that permit a CPU to exercise the following built-in features: * * * * * * * * * * * Single 5 V Power Supply Compatible with CCITT V.21 DTMF Generator and Receiver for All 16 Standard Digits Capable of Driving 0 dBm into a 600 Load (VCC = 5 V) AGC (Auto Gain Control) Amplifier for DTMF Receiver Imprecise Call Progress Tone (400 Hz) Detector A Transmit Attenuator Programmable in 1 dB Steps 2100 Hz Answer Tone Generator Serial Control Interface Analog Loopback Configuration for Self Test Power-Down Mode, Less than 1 A
28 1
FW SUFFIX SOP CASE 751M
ORDERING INFORMATION
MC145446AFW SOP
PIN ASSIGNMENT
VCC GND Vref CDA DTMF IN AGC OUT FTLC2 FTLC3 X1 X2 TLA GND VCC R/W 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 FTLC1 RxBO RxGC RxA TxA1 TxA2 DSI VCC E SCK DATA I/O TxD RxD SD/CD/DV
This document contains information on a new product. Specifications and information herein are subject to change without notice.
REV 1 7/96
(c) Motorola, Inc. 1996 MOTOROLA
MC145446A 1
BLOCK DIAGRAM
AGC OUT FLTC2 FLTC3 FLTC1
DTMF IN
AGC
NOISE FILTER
LOW-BAND BPF FREQUENCY DETECTER CODE CONVERTER (DECODER) TIMING CIRCUIT
4
STATUS REGISTER
RxBO + RxA RxGC 30 k 65 k - NOISE FILTER HIGH-BAND BPF
SD/CD/DV
FSK/DTMF LOOPBACK PATH TxD FSK MODULATOR LEVEL CONTROL DTMF GENERATOR MUX HIGH-BAND BPF MUX/ MIXING FSK DEMODULATOR RxD LOW-BAND BPF MUX CARRIER/CPT DETECTOR
CDA
TLA
MODE CONTROL LOGIC DATA I/O CONTROL SHIFT REGISTER STATUS SHIFT REGISTER R/W SMOOTHING FILTER _ + -1
DSI TxA2
TxA1
E POWER-ON RESET ANALOG GROUND GENERATOR CLOCK GENERATOR
SCK
VCC
GND
Vref
X1
X2
MC145446A 2
MOTOROLA
ABSOLUTE MAXIMUM RATINGS (Voltages referenced to VSS)
Rating DC Supply Voltage DC Input Voltage DC Output Voltage Clamp Diode Current per Pin DC Current per Pin Power Dissipation Storage Temperature Range Symbol VCC Vin Vout IIK, IOK Iout PD Tstg Value - 0.5 to 7.0 - 0.5 to VCC + 0.5 - 0.5 to VCC + 0.5 20 25 500 - 65 to 150 Unit V V V mA mA mW C This device contains circuitry to protect the inputs against damage due to high static voltages or electric fields; however, it is advised that normal precautions be taken to avoid applications of any voltage higher than the maximum rated voltages to this high impedance circuit. For proper operation it is recommended that Vin and Vout be constrained to the range VSS (Vin or Vout) VDD. Reliability of operation is enhanced if unused inputs are tied to an appropriate logic voltage level (e.g., either VSS or VDD).
RECOMMENDED OPERATING CONDITIONS
Parameter DC Supply Voltage DC Input Voltage DC Output Voltage Input Rise Time Input Fall Time Crystal Frequency Operating Temperature Range Symbol VCC Vin Vout tr tf fosc TA Min 4.5 0 0 0 0 -- - 20 Typ 5 -- -- -- -- 3.579545 25 Max 5.5 VCC VCC 500 500 -- 70 Unit V V V ns ns MHz C
DC ELECTRICAL CHARACTERISTICS (VCC = 5.0 V 10%, TA = - 20 to 70C)
Characteristic Input Voltage H Level L Level Output Voltage H Level L Level Input Current TxD, E, SCK, DATA I/O, R/W Quiescent Supply Current Symbol VIH VIL VOH VOL Iin ICC IOH = 20 A IOL = 20 A IOL = 2 mA Vin = VCC or GND FSK Mode DCMF Receive Mode Power-Down Supply Current ICC Power-Down Mode 1 Power-Down Mode 2 Conditions Min 3.15 -- VCC - 0.1 -- -- -- -- -- -- -- Typ -- -- VCC - 0.01 0.01 -- 1.0 8 10 -- -- Max -- 1.1 -- 0.1 0.4 10.0 -- -- 500 1 A A A mA V Unit V
TRANSMIT CARRIER CHARACTERISTICS (VCC = 5.0 V 10%, TA = - 20 to 70C)
Characteristic Carrier Frequency Channel 1 Mark ``1'' Space ``0'' Carrier Frequency Channel 2 Mark ``1'' Space ``0'' Answer Tone Transmit Carrier Level Second Harmonic Energy Out-of-Band Energy * VTxA1 - VTxA2, RL = 1.2 k Symbol f1M f1S f2M f2S fans VO* V2h* VOE* Attenuator = 0 dB RTLA = , RL = 1.2 k, VTxA1 - VTxA2 Conditions Crystal Frequency 3.579545 MHz Min 974 1174 1644 1844 2090 -- -- Typ 980 1180 1650 1850 2100 7 - 46 Figure 2 Max 986 1186 1656 1856 2110 -- -- dBm dBm dBm Unit Hz
MOTOROLA
MC145446A 3
TRANSMIT ATTENUATOR CHARACTERISTICS (VCC = 5.0 V 10%, TA = - 20 to 70C)
Characteristic Attenuator Range Attenuator Accuracy 1 dB - 5 dB 6 dB - 9 dB 10 dB - 15 dB Symbol ARNG AACC Conditions Min 0 - 0.5 -1 - 1.7 Typ -- -- -- -- Max 15 0.5 1 1 Unit dB dB
RECEIVER CHARACTERISTICS (INCLUDES HYBRID, DEMODULATOR, AND CARRIER DETECTOR)
(VCC = 5.0 V 10%, TA = - 20 to 70C) Characteristic Input Impedance Receiver Carrier Amplitude Carrier Detect Threshold OFF to ON ON to OFF Hysterisis (VCDON - VCDOF) Carrier Detect Timing OFF to ON Symbol RIRX VIRX VCDON VCDOF HYS TCDON CD1 = 0, CD0 = 0 CD1 = 0, CD0 = 1 CD1 = 1, CD0 = 0 CD1 = 1, CD0 = 1 ON to OFF TCDOFF CD1 = 0, CD0 = 0 CD1 = 0, CD0 = 1 CD1 = 1, CD0 = 0 CD1 = 1, CD0 = 1 CDA = 1.2 5V fin = 1.0 kHz Conditions RxA Pin Min 50 - 48 -- -- 2 -- -- -- -- -- -- -- -- Typ -- -- - 44 - 47 -- 450 10 10 70 35 35 20 15 Max -- - 12 -- -- -- -- -- -- -- -- -- -- -- dB ms Unit k dBm dBm
CPTD CHARACTERISTICS (VCC = 5.0 V 10%, TA = - 20 to 70C)
Characteristic Bandpass Filter Center Frequency Bandpass Filter - 3 dB Band Width Tone Detect Level OFF to ON ON to OFF Tone Detect Timing OFF to ON ON to OFF Symbol fc BW VTDON VTDOF TTDON TTDOF CDA = 1.25 V fin = 400 Hz Conditions Min -- -- -- -- -- -- Typ 400 140 - 44 - 47 10 25 Max -- -- -- -- -- -- ms Unit Hz Hz dBm
DTMF TRANSMIT CHARACTERISTICS (VCC = 5.0 V 10%, TA = - 20 to 70C)
Characteristic Tone Output Level Low Group High Group High Group Pre-Emphasis DTMF Distortion DTMF Frequency Variation Out-of-Band Energy Setup Time Symbol Vfl Vfh PE DIST fV VOE tosc -- Conditions Attenuator = 0 dB RTLA = Crystal Frequency 3.579545 MHz Single Tone Mode VTxA1 - VTxA2, RL = 1.2 k Min -- -- 0 -- -1 Typ 2.5 3.5 -- 5 -- Figure 1 4 -- Max -- -- 3 -- 1 dB % % dB ms Unit dBm
MC145446A 4
MOTOROLA
DTMF RECEIVER CHARACTERISTICS (VCC = 5.0 V 10%, TA = - 20 to 70C)
Characteristic Input Impedance Detect Signal Level (Each Tone) Twist (High Group Tone/Low Group Tone Frequency Detect Band Width (Figure 4) Frequency No-Detect Band Width (Figure 4) DTMF Detect Timing OFF to ON TCDON CD1 = 0, CD0 = 1 CD1 = 1, CD0 = 0 CD1 = 1, CD0 = 1 ON to OFF TCDOFF CD1 = 0, CD0 = 1 CD1 = 1, CD0 = 0 CD1 = 1, CD0 = 1 Symbol Conditions Min 50 - 48 - 10 1.5% 2 Hz -- -- -- -- -- -- -- Typ -- -- -- -- -- 25 30 40 25 35 25 Max -- 0 10 -- 3.5 -- -- -- -- -- -- Unit k dBm dB -- % ms
DEMODULATOR CHARACTERISTICS (VCC = 5.0 V 10%, TA = - 20 to 70C)
Characteristic Bit Bias Bit Error Rate (CCITT Line Simulation, 511-Bit Pattern) Symbol ID BER Conditions Input Level = - 24 dBm S/N = 4 dB Min -- -- Typ 5 0.00001 Max -- -- Unit % --
SWITCHING CHARACTERISTICS (VCC = 5.0 V 10%, TA = - 20 to 70C)
Timing Diagram Reference No. 1 2 3 4 5 6, 18 7 9 12 th 8 10 14 15 td 13 17 twe twm 11 16
Characteristic Input Pulse Width (H) E, SCK Input Pulse Width (L) E, SCK Clock Cycle Input Rise Time Input Fall Time Recovery Time E to SCK Setup Time DATA to SCK R/W to DATA R/W to DATA Hold Time SCK to DATA E to R/W DATA to R/W R/W to DATA Read Data Delay Time E to DATA SCK to DATA Enable Minimum Interval Mode Switch Minimum Interval
Symbol twh twl tc tr tf trec tsu
Min 50 50 100 -- -- 50 50 100 50 50 50 50 50 -- -- -- --
Typ -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
Max -- -- -- 2 2 -- -- -- -- -- -- -- -- 50 50 450 600
Unit ns ns ns s s ns ns ns ns ns ns ns ns ns ns ns ns
MOTOROLA
MC145446A 5
CONTROL REGISTER 1 E* (NOTE 6) 6 SCK 7 9 DATA CD1 CD0 1 2 8 CH SQ 3 4 5 2 1 T3 T2 T1 3 6 7 4 T0 A3 A2 A1 A0 M3 M2 M1 10 R/W * The enable signal corresponds to preceding data format. M0 8 9 10 5 11 12 13 14 7 15 16 (NOTE 1)
(LSB CLOCK)
STATUS REGISTER 11 E (NOTE 7) 18 12 SCK 13 17 DATA D0 D1 16 R/W D2 D3 1 1 (NOTE 5) 3 2 3 0 2 1 2 4 1 (NOTE 2) D0 D1 14 (NOTE 4) D2 D0 4 5 1 (NOTE 3) 5 D1 15 (HIGH-IMPEDANCE) 2
NOTES: 1. The data in front of the enable signal pulse will be latched. 2. The latched data will be repeated until there is an enable pulse. 3. The detected data will be updated with the next enable pulse. 4. After the R/W pin becomes INACTIVE, the data will be lost. 5. D1 corresponds to Clock1. 6. The enable and the SCK signals need to be set at the logic low level when the R/W signal changes. 7. The SCK must be held at low level when the enable signal is at high level.
Figure 1. Serial Data Input Timing
MC145446A 6
MOTOROLA
0 TRANSMIT CARRIER LEVEL (dBr) 0
3.4 k 4 k
16 k
256 k
f (Hz)
- 25
- 15 dB/OCT.
- 55
Figure 2. Out-of-Band Energy
Von
Voff
RxA, DTMF IN
ton SD/DV/CD
toff
Figure 3. FSK, DTMF Carrier Detect Timing
NO-DETECT
DETECT MINIMUM WIDTH
NO-DETECT
- 3.5%
- 1.5% - 2 Hz
fo
+ 1.5% + 2 Hz
Figure 4. DTMF Frequency Detect Bandwidth
MOTOROLA
EEEEEEEE EEEEEEEE EEEEEEEE EEEEEEEE
+ 3.5%
EEEEEEEE EEEEEEEE EEEEEEEE EEEEEEEE
MC145446A 7
PIN DESCRIPTIONS
VCC Positive Power Supply (Pins 1, 13, 21) The digital supply pins, which are connected to the positive power supply (5 V). GND Ground Pins (Pins 2, 12) The ground pins are connected to the system ground. Vref Reference Analog Ground (Pin 3) This pin provides the analog ground voltage, which is internally regulated to VCC/2. It should be decoupled to the GND with 0.1 F and 100 F capacitors. X1 Crystal Oscillator Output (Pin 9) A 3.579545 MHz 0.1% crystal oscillator is tied to this pin with the other end connected to X2. X2 Crystal Oscillator Input (Pin 10) A 3.579545 MHz 0.1% crystal oscillator is tied to this pin with the other end connected to X1. X2 may also be driven directly from an appropriate external source. SCK Serial Clock Input (Pin 19) This pin is the clock input for the 16-bit control resistor and the 4-bit status resistor. The serial data is captured into the control register, or is shifted out of the status register on the rising edge of SCK. DATA I/O Serial Data Input/Output (Pin 18) This pin is the 16-bit control register input, which determines the operation mode, DTMF tone, transmit attenuation (receiver gain), carrier detect time, channel, and transmit squelch. This pin is also the four-bit status register output which indicates the received DTMF tone (hexadecimal codes). E Enable Input (Pin 20) When the R/W pin is at logic low, high level on the E pin makes the 16-bit control register data transparent to the mode control logic so that the device operation is changed. While this pin is at logic low, the control register and the mode control logic are isolated. The E pin must NOT be held high while the control register data is being changed. When the R/W pin is at logic high, the rising edge of E transfers the four-bit DTMF data from the DTMF decoder to the status register. Then the first bit (LSB = D0) is presented at the Data I/O pin. R/W Read/Write Data Switch (Pin 14) This pin is used for controlling the I/O direction of the Data I/O pin.
TxD Transmit Data Input (Pin 17) This pin is the transmit data input. When the device is in FSK mode, the mark frequency is generated when this pin is at the logic high level. The space frequency is generated when the pin is at a logic low. RxD Receive Data Output (Pin 16) This pin is the receive data output. When the device is in the FSK mode, a high logic level of this pin indicates that the mark carrier frequency has been received, and a low logic level indicates the space carrier frequency has been received. SD/CD/DV Carrier/Call Progress Tone Detect/DTMF Data Valid Detect (Pin 15) This pin works as a carrier detector in the FSK mode, whereas it works as the call progress tone detector in the CPTD mode and as the receive DTMF detector in the DTMF Rx mode. The output goes to a logic low level when the input signal reaches the minimum threshold of the detect level that is adjusted by the CDA voltage. When this pin is logic high, the receive data output (RxD) is clamped high to avoid the error that may occur with the loop noise. In DTMF Rx mode, the logic low on this pin indicates that the valid DTMF frequencies are detected. The received tone is decoded to four-bit data, then stored in the DTMF decoder by the falling edge of DV. TxA1 Non-Inverting Transmit Analog Carrier Output (Pin 24) This pin is the line driver non-inverting output. A 7 dBm (typ) differential output voltage can be obtained by connecting a 1.2 k load resistor between Tx1 and Tx2. Attention must be paid so as not to exceed this level when an external input is added to the DSI pin. A telephone line (600 ) is driven through an external 600 resistor (see the Application Circuit). In this case, the output level becomes about a half of the differential output. TxA2 Inverting Transmit Analog Carrier Output (Pin 23) This pin is the line driver inverting output. The signal is equal in magnitude, but 180 out of phase with the TxA1 (refer to TxA1). RxA Receive Signal Input (Pin 25) This pin is the carrier signal input, and is enabled when the device is in FSK or CPTD mode. RxGC Receive Gain Adjust (Pin 26) This pin is used to adjust the receive buffer gain. To adjust the gain, a resistor may be added between this pin and the RxBO pin (refer to the Block Diagram). This pin may be held open when the gain adjustment is not needed. RxBO Receive Buffer Output (Pin 27) This pin is the receive buffer output.
MC145446A 8
MOTOROLA
DTMF IN DTMF Receive Input (AGC Amp Input) (Pin 5) This pin is the receive DTMF signal input. It is enabled when the device is in the DTMF receive mode. AGC OUT AGC Output (Pin 6) This pin is used by the manufacturer to test the auto gain control amplifier. It should be held open in normal operation. DSI Driver Summing Input (Pin 22) This pin is the inverting input of the line driver. An external signal may be transmitted through an external series resistor RDSI. The differential gain GDSI = (VTxA1 - VTxA2)/VDSI is determined by the following equation: GDSI = - 2Rf / RDSI, Rf
FTLC2 DTMF Receive Low Group Filter Test (Pin 7) This pin is a high-impedence filter output. It may be used for testing the DTMF receive high goup bandpass filter characteristics, and is reserved for manufacturer's use only. In normal operation, this pin should be decoupled to Vref with a 0.1 F capacitor. FTLC3 DTMF Receive High Group Filter Test (Pin 8) This pin is a high-impedence filter output. It may be used for testing the DTMF receive high group bandpass filter characteristics, and is reserved for manufacturer's use only. In normal operation, this pin should be decoupled to Vref with a 0.1 F capacitor.
SERIAL CONTROL INTERFACE
The following six functions are determined by the 16 bits of serial data in the control register.
CONTROL REGISTER FUNCTION MODE TRANSMIT ATTENUATOR TRANSMIT TONE FREQUENCY TRANSMIT SQUELCH CHANNEL CARRIER DETECT TIME : : : : : : M3 A3 T3 SQ CH CD1 CD0 M2 A2 T2 M1 A1 T1 M0 A0 T0
X 20 k
Note that the programmable transmit attenuator does not affect in this case. The DSI pin should be held open when not in use. CDA Carrier Detect Level/CPTD Level Control (Pin 4) The carrier/call progress tone detect level is adjusted by the CDA pin voltage. When this pin is held open, the CDA voltage is set to 1.25 V (VCC = 5 V) by an internal divider. Then the detect level is set at - 44 dBm (typ) for off to on, and - 47 dBm (typ) for on to off, and the hysteresis is set minimum 2 dB. This pin has a very high input impedance so it should be connected to GND with a 0.1 F capacitor to keep it under the regulations. An external voltage may be applied to this pin to adjust the carrier detect threshold. The following equations may be used to find the CDA voltage required for a given threshold voltage: VCDA = 245 x Von VCDA = 347 x Voff TLA Transmit Carrier Level Adjust (Pin 11) This pin is used to adjust the transmit carrier level that is determined by the value of the resistor (RTLA) connected between this pin and the GND. The maximum level can be obtained when this pin is shorted to GND (RTLA = 0). FTLC1 FSK Filter Test (Pin 28) This pin is a high-impedence filter output. It may be used for testing the FSK filter characteristics, and is reserved for manufacturer's use only. In normal operation, this pin should be decoupled to Vref with a 0.1 F capacitor.
The received DTMF tones are indicated by the four bits of data in the status register.
STATUS REGISTER RECEIVE TONE FREQUENCY : D3 D2 D1 D0
Figure 1 presents the timing diagram of 16-bit control register input and four-bit status output. When the R/W pin is in logic low, the 16-bit data is captured into the control register at the rising edge of SCK and latched in the mode control logic to update the function mode at logic high input to the E pin. When the R/W pin is in logic high, the status register is selected to read out the received DTMF data, the four-bit data in the DTMF decoder is loaded into the status register, and the first bit (D0) is presented at the Data I/O on the rising edge of E. The following bits are repeatedly shifted out as D1-D2-D3-D0-D1-... by the rising edges of SCK.
CONTROL REGISTER BIT MAP DESCRIPTION
FUNCTION MODE (M3 to M0) One of the following modes is selected from the four-bit data (M3 to M0) shown in Table 1. Table 2 presents each output status; the functions are described below.
MOTOROLA
MC145446A 9
Table 1. Function Mode Truth Table
M3 0 0 0 0 0 0 0 0 1 1 M2 0 0 0 0 1 1 1 1 0 0 M1 0 0 1 1 0 0 1 1 0 0 M0 0 1 0 1 0 1 0 1 0 1 Function Mode FSK FSK Analog Loopback CPTD Answer Tone DTMF Transmit Single Tone Power-Down 1 Power-Down 2 DTMF Receive DTMF Analog Loopback
DTMF Receive Mode The receiver works as a DTMF tone receiver. The DV goes low when a valid DTMF tone is detected. The transmitter is disabled. DTMF Analog Loopback Mode The transmitter, working as a DTMF tone generator, is internally connected to the receiver working as DTMF tone receiver. The DV goes low when the receiver detects a valid DTMF tone. This feature is used for the device self test. Single Tone Mode The transmitter generates one of the eight frequencies of the DTMF tone. The receiver is disabled. Power-Down Mode 1 Whole internal circuits, except the oscillator, are disabled and all outputs except the X1 pin go to the high-impedance state. The supply current decreases to 500 A (max). Power-Down Mode 2 Whole internal circuits, including the oscillator, are disabled and all outputs go to the high-impedance state. The supply current decreases to 1.0 A (max). Transmit Attenuator/AGC Gain Set (A3 to A0) Four-bit serial data (A3 - A0) sets up the analog transmit level in the FSK, answer tone, DTMF, analog loopback, and single tone mode. The range of the transmit attenuator is 0 to 15 dB in 1 dB steps. The attenuator, however, does not affect the external signal input from the DSI. These bits also determine the AGC amplifier gain in the DTMF receive mode. In normal operation, "Automatic" may be selected so that the gain is automatically adjusted corresponding to the input signal level. See Table 3 for a detailed description. Transmit Tone Frequency (T3 to T0) These four bits (T3 to T0) determine the DTMF tone frequencies in DTMF transmit and DTMF analog loopback mode, and determine the single tone frequency in the single tone mode. Tone frequency assignments with reference to T3 - T0 are shown in Table 4.
FSK Mode The transmitter and the receiver work as an FSK modulator/demodulator. The SD pin goes low when a valid FSK signal is detected. DTMF Transmit Mode The transmitter works as a DTMF tone generator. The receiver is disabled. CPTD (Call Progress Tone Detect) Mode The receiver works as a 400 Hz call progress tone detector. The CD pin goes low when a valid call progress tone is detected. Answer Tone Mode The transmitter works as a 2100 Hz answer tone generator. The receiver is disabled. FSK Analog Loopback Mode The transmitter, working as the FSK modulator, is internally connected to the receiver working as the FSK demodulator. This feature is used for the device self test.
Table 2. Output Status
Output Pin Function Mode FSK FSK Loopback Call Progress Tone Answer Tone DTMF Transmit Single Tone Power-Down 1, 2 DTMF Receive DTMF Loopback RxD Receive Digital Data H H H H High Impedance H SD/CD/DV Carrier Detect Signal CPTD Signal H H H High Impedance DV Signal TxA1, TxA2 FSK
VCC/2 Answer Tone DTMF Tone Single Tone High Impedance VCC/2 DTMF Tone
MC145446A 10
MOTOROLA
Table 3. Transmit Attenuator/AGC Gain Set Truth Table
A3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 A2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 A1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 A0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Attenuation (dB) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 AGC Gain Step (dB) - 5.0 - 2.5 0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 20.0 Clamp Automatic -- -- --
Table 4. Tone Frequency Truth Table
Tone Frequency (Hz) DTMF Mode T3/D3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 T2/D2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 T1/D1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 T0/D0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Low Group 941 697 697 697 770 770 770 852 852 852 941 941 941 697 770 852 High Group 1633 1209 1336 1477 1209 1336 1477 1209 1336 1477 1336 1209 1477 1633 1633 1633 Keyboard Equivalent D 1 2 3 4 5 6 7 8 9 0 * # A B C Single Tone Mode 941 697 697 697 770 770 770 852 1336 1477 1336 1209 1477 1633 1633 1633
MOTOROLA
MC145446A 11
Transmit Squelch The 1-bit serial data (SQ) controls the transmit analog squelch. The FSK signal, DTMF tones, single tone, and answer tone are disabled, then TxA1 and TxA2 will be clamped to VCC/2 when the transmit squelch goes to the Enable (SQ = 1) state. The transmit squelch does not affect the external signal from the DSI. Table 5. Transmit Squelch Truth Table
SQ 1 0 Squelch Enable Disable
Table 7. Carrier/DTMF Detect Time Truth Table
FSK Mode Carrier Detect Time (typ) CD1 0 0 1 1 CD0 0 1 0 1 ton (ms) 450 10 10 70 toff (ms) 35 35 20 15 25 30 40 DTMF Receive Mode Carrier Detect Time (typ) ton (ms) toff (ms)
Reserved 25 35 25
Power-On Reset When the power is switched on, this device is entered into Power-Down Mode 2 by the internal power-on reset circuit.
Channel When the function mode is either on the FSK or analog loopback mode, the transmit and receive channel is set up with a 1-bit serial data (CH). Table 6. Channel Truth Table
CH 1 0 Channel 1 (Originate) 2 (Answer)
STATUS REGISTER BIT MAP DESCRIPTION
Received Tone Frequency (D3 to D0) This four-bit data (D3 to D0) indicates the received DTMF tones. The first bit (D0) is presented at Data I/O on the rising edge of E, and the following bits (D1-D2-D3-D0-D1- ...) are shifted out and presented on the next rising edge of SCK. The data configuration corresponding to each tone is shown in Table 4.
Carrier Detect Time The carrier and DTMF tone detect timing are determined by two-bit serial data (CD1, CD0). The timing diagram is shown in Figure 3.
MC145446A 12
MOTOROLA
100 F
0.1 F VREF TxA2 600 TxA1 FTLC1 RxA DTMF IN FTLC2 RxGC RxBO MC145446A TxD RxD
600 : 600
10 TIP
*
RING
0.1 F
0.1 F
FTLC3 0.1 F
I/O PORT 0.1 F
SD/CD/DV R/W CDA DATA I/O SCK TLA E DSI
MCU
0.1 F
100 F +5V
VCC
GND
*
LINE PROTECTION CIRCUIT
SYSTEM GROUND
REFERENCE ANALOG GROUND
Figure 5. Application Circuit
MOTOROLA
MC145446A 13
PACKAGE DIMENSIONS
FW SUFFIX SOP CASE 751M-01 VIEW AB
28
A -Y-
15
B -Z-
E
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS A AND B DO NOT INCLUDE MOLD PROTRUSION. MAXIMUM MOLD PROTRUSION SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. DAMBAR PROTRUSION SHALL NOT CAUSE THE LEAD WIDTH TO EXCEED 0.65 (0.026). MILLIMETERS MIN MAX 17.80 18.03 7.40 7.62 2.65 2.25 2.45 0.35 0.51 10.00 10.60 0.40 0.70 1.27 BSC 0.10 0.25 0.635 BSC 8_ 0.25 0.75 0.05 0.20 1.40 REF INCHES MIN MAX 0.701 0.710 0.291 0.300 0.104 0.090 0.096 0.014 0.020 0.394 0.414 0.016 0.028 0.050 BSC 0.004 0.010 0.025 BSC 8_ 0.010 0.030 0.002 0.008 0.110 REF
1
14
V X 45_ " 5_
D 28X 0.25 (0.010) 0.18 (0.007)
M M
TZ T
S
Y
S
0.18 (0.007)
M
TY
S
Z
S
C L 0.10 (0.004) T C -TW L
4X SEATING PLANE
VIEW AB
DIM A B C C1 D E F G J L V W X
C1
J
G
24X
W REF Z
F
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. 1-800-441-2447 or 602-303-5454 MFAX: RMFAX0@email.sps.mot.com - TOUCHTONE 602-244-6609 INTERNET: http://Design-NET.com
JAPAN: Nippon Motorola Ltd.; Tatsumi-SPD-JLDC, 6F Seibu-Butsuryu-Center, 3-14-2 Tatsumi Koto-Ku, Tokyo 135, Japan. 03-81-3521-8315 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298
MC145446A 14
*MC145446A/D*
MC145446A/D MOTOROLA


▲Up To Search▲   

 
Price & Availability of MC145446

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]


 . . . . .
  We use cookies to deliver the best possible web experience and assist with our advertising efforts. By continuing to use this site, you consent to the use of cookies. For more information on cookies, please take a look at our Privacy Policy. X