TP3057WM

Enhanced Serial Interface CODEC/Filter COMBO Family

General Description

The TP3054, TP3057 family consists of m-law and A-law

monolithic PCM CODEC/filters utilizing the A/D and D/A

conversion architecture shown inFigure 1, and a serial PCM

interface. The devices are fabricated using National's ad-

vanced double-poly CMOS process (microCMOS).

The encode portion of each device consists of an input gain

adjust amplifier, an active RC pre-filter which eliminates very

high frequency noise prior to entering a switched-capacitor

band-pass filter that rejects signals below 200 Hz and above

3400 Hz. Also included are auto-zero circuitry and a com-

panding coder which samples the filtered signal and en-

codes it in the companded m-law or A-law PCM format. The

decode portion of each device consists of an expanding

decoder, which reconstructs the analog signal from the

companded m-law or A-law code, a low-pass filter which

corrects for the sin x/x response of the decoder output and

rejects signals above 3400 Hz followed by a single-ended

power amplifier capable of driving low impedance loads.

The devices require two 1.536 MHz, 1.544 MHz or 2.048

MHz transmit and receive master clocks, which may be

asynchronous; transmit and receive bit clocks, which may

vary from 64 kHz to 2.048 MHz; and transmit and receive

frame sync pulses. The timing of the frame sync pulses and

PCM data is compatible with both industry standard formats

Features

 Complete CODEC and filtering system (COMBO)

including:

 Transmit high-pass and low-pass filtering

 Receive low-pass filter with sin x/x correction

 Active RC noise filters

 m-law or A-law compatible COder and DECoder

 Internal precision voltage reference

 Serial I/O interface

 Internal auto-zero circuitry

 m-law, 16-pinÐTP3054

 A-law, 16-pinÐTP3057

 Designed for D3/D4 and CCITT applications

 g5V operation

 Low operating powerÐtypically 50 mW

 Power-down standby modeÐtypically 3 mW

 Automatic power-down

 TTL or CMOS compatible digital interfaces

 Maximizes line interface card circuit density

 Dual-In-Line or surface mount packages

 See also AN-370, ``Techniques for Designing with

CODEC/Filter COMBO Circuits

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