TP11368

Octal Adaptive Differential PCM Processor

General Description

The TP11368 is an octal (8) 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 TP11368

ADPCM processor can operate on up to 16 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

TP11368 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

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

full-duplex operation in 8 kHz frame

n

Each channel individually configurable

n

Selectable µ-law or A-law PCM coding

n

Asynchronous 16 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

DS012902-1

FIGURE 1. Block Diagram

March 1997

© 1997 National Semiconductor Corporation

DS012902

www.national.com