TP11362A

Quad Adaptive Differential PCM Processor

General Description

The TP11362A is a quad (4) channel Adaptive Differential

Pulse Code Modulation (ADPCM) transcoder, fully compat-

ible to ITU G.726 recommendation in 40 kbps, 32 kbps,

24 kbps, 16 kbps and ANSI 32 kbps modes. The TP11362A

ADPCM processor can operate on up to 8 independent

channels in an 8 kHz frame. Each channel is individually

configured, supporting both full and half duplex operation. All

input/output transfers occur on an interrupt basis using se-

rial, double buffered data registers. Together with National’s

TP11362A forms complete ADPCM channels with Codec/

filtering.

Features

n

CCITT G.726 compatible at 40, 32, 24, 16 kbps

n

ANSI T1.301 compatible at 32 kbps

n

8-channel half-duplex (encode or decode) or 4-channel

full-duplex operation in 8 kHz frame

n

Each channel individually configurable

n

Selectable µ-law or A-law PCM coding

n

Asynchronous 8 MHz master clock operation

n

TTL and CMOS compatible inputs and outputs

n

28-pin PLCC or 24-pin DIP packages

n

Power consumption of typ. 6 mW at +5V per full-duplex

channel

n

On-Chip Power-On-Reset

n

−40˚C to +85˚C operating temperature range

n

Single 5V supply

Block Diagram

DS012877-1

FIGURE 1. Block Diagram

March 1997

© 1997 National Semiconductor Corporation

DS012877

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