TCM37C14A, TCM37C15A

PCM COMBO WITH PROGRAMMABLE GAIN CONTROL

SLWS018B – JUNE 1996 – REVISED MAY 1998

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POST OFFICE BOX 655303

Recommendations for Input Signals

Greater than – 55 dBm0

Control With Pin-Selectable

Gain/Attenuation Levels

TCM37C14A

Converters

COMBOs (CODEC and Filters)

– Operating Mode...70 mW Typical

– Power-Down Mode...7 mW Typical

Functions

or A-Law Companding and Pin-Selectable

Master Clock Rate (1.536 MHz, 1.544 MHz,

and 2.048 MHz Available)

description

The TCM37C14A and TCM37C15A PCM combo with programmable gain control devices are single-chip PCM

combos (pulse-code-modulated CODECs with voice-band filtering). They are designed to perform transmit

encoding (A/D conversion) and receive decoding (D/A conversion), as well as the transmit and receive filtering

functions required to meet CCITT/(D3/D4) G.711 and G.714 specifications in a PCM system. Each device

provides all the functions required to interface a full-duplex, 4-line voice telephone circuit with a TDM

(time-division-multiplexed) system, and also perform the encoding and decoding of call progress tones. The

TCM37C14A and TCM37C15A are based on the proven TI TCM29C13A core, and have the added feature of

programmable transmit and receive gain.

Primary applications include line interface for digital transmission and switching of T1/E1 carrier (PABX [private

branch automatic exchange] and central office telephone systems), subscriber line concentrators, digital

encryption systems, and digital signal processing. They are intended to be used at the analog termination of

a PCM line or trunk to the POTS (plain old telephone system) local-loop line.

The TCM37C15A is available in 20-pin DW SOIC (small-outline IC) or 20-pin N PDIP (plastic dual-in-line

package) packages, and the TCM37C14A is available in a 24-pin DW SOIC package and includes differential

output. All are characterized for operation from – 40

°C to 85°C.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Copyright

© 1998, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

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PWRO+

PWRO –

RIN

RS1

RS2

GSR

GS1

GS0

CLKSEL

PCMIN

FSR

GSX

TS1

TS2

ANLGIN

AGND

TSX

PCMOUT

FSX

ASEL

MCLK

DGND

TCM37C14A ...DW PACKAGE

(TOP VIEW)

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PWRO+

RIN

RS1

RS2

GSR

GS1

GS0

PCMIN

FSR

GSX

TS1

TS2

ANLGIN

AGND

PCMOUT

FSX

MCLK

DGND

TCM37C15A ...DW OR N PACKAGE

(TOP VIEW)