TCM8000 Datasheet, PDF(3/19 Page) Texas Instruments – CELLULAR TELEPHONE AUDIO PROCESSOR

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TCM8000 Datasheet, PDF (3/19 Pages) Texas Instruments – CELLULAR TELEPHONE AUDIO PROCESSOR

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TCM8000

CELLULAR TELEPHONE AUDIO PROCESSOR

SCTS041A â D4086, AUGUST 1992 â REVISED APRIL 1993

NAME

CIN

CMPR

CTC

NO.

FN FR

31 36

35 40

34 39

32 27

CTI

13 18

CVE

DAC

DATA

DCLK

ETC

33 38

7 12

5 10

17 22

EXIN

EXO

GND

HFO

HSO

LIMIN

LOAD

16 21

15 20

19 24

11 16

10 15

39 44

M1N

M1O

M1P

M2N

M2O

M2P

POUT

PSO

REF

RXDO

RXIN

RXLIM

25 30

23 28

24 29

27 32

28 33

26 31

38 43

9 14

18 23

8 13

RXO

RXVI

TDI

14 19

12 17

29 34

TXDA

22 27

TXLIM

37 42

TXO

TXSUM

TXVI

TXVO

36 41

30 35

VBRX

Terminal Functions

I/O

DESCRIPTION

I Compressor analog input

I Compressor rectifier analog input

O Compressor analog output. CO should be ac coupled to TXVI and to CMPR.

O Compressor time constant control, analog output. A 220-nF capacitor should be connected between CTC and

GND.

I Call tone analog input. Signals on CTI are summed into the receive voice path prior to the volume control

circuit. CTI can be muted under control of the serial interface.

I Compressor virtual earth, analog input

O Digital-to-analog converter output, programmable between GND and VCC /2 in sixteen steps

I Serial interface digital data input

I Serial interface digital clock input

O Expander time constant control, analog output. A 220-nF capacitor should be connected between ETC and

GND.

I Expander analog input

O Expander analog output. EXO should be ac coupled to RXVI.

Ground

O Normal drive receiver voice analog output

O High drive receiver voice analog output

I Transmit limiter analog input

I Serial interface load, digital input. Data shifted into DATA under control of DCLK is transferred to internal

registers when LOAD goes high.

I Preamplifier 1 negative analog input

O Preamplifier 1 analog output

I Preamplifier 1 positive analog input

I Preamplifier 2 negative analog input

O Preamplifier 2 analog output

I Preamplifier 2 positive analog input

O Preemphasis filter analog output. POUT should be ac coupled to LIMIN.

O Analog output of SAT filter

Unbuffered midsupply voltage, nominal output VCC /2

O Receive data filter analog output

I Receive analog input

I/O Receive limiter adjust voltage, controls maximum signal output on HSO. The dc input is between GND and

VCC /2.

O Receive voice filter analog output

I Receive voice analog input to volume control circuit. RXVI can be muted under control of the serial interface.

I Side tone analog input. Signals on this terminal are summed into the HSO output signal.

I Tone of DTMF analog input. Signals on this terminal can be used in place of the main voice signal in the TX

path and summed into the RX voice path, under control of the serial interface.

I Transmit data analog input

I Transmit-limiter level adjust, controls maximum signal level at TXO. The dc input is between GND and VCC /2.

O Transmit section analog output

I Transmit summing analog input. The signal on TXSUM is summed into the main TX output after all filter stages.

TXSUM can be muted under control of the serial interface.

I Transmit voice analog input

O Transmit voice analog output. TXVO is the output from the preamplifier and microphone gain adjust sections.

It should be ac coupled into the compressor input CIN.

Buffered midsupply voltage to receive sections, nominal output VCC /2

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