DESCRIPTION

The IDT821054 is a feature rich, single-chip, programmable 4-channel PCM CODEC with on-chip filters. Besides the μ-Law/A-Law companding and linear coding/decoding (14 effective bits + 2 extra sign bits), the IDT821054 also provides 1 FSK generator for sending Caller-ID messages, 2 programmable tone generators per channel (which can generate ring signals) and 2 programmable chopper clocks for SLICs.

FEATURES

? 4-channel CODEC with on-chip digital filters

? Software selectable A/μ-law, linear code conversion

? Meets ITU-T G.711 - G.714 requirements

? Programmable digital filters adaptingto system demands:

- AC impedance matching

- Transhybrid balance

- Frequency response correction

- Gain setting

? Supports two programmable PCM buses

? Flexible PCM interface with up to 128 programmable time slots, data rate from 512 kbits/s to 8.192 Mbits/s

? MPI control interface

? Broadcast mode for coefficient setting

? 7 SLIC signaling pins (including 2 debounced pins) per channel

? Fast hardware ring trip mechanism

? 2 programmable tone generators per channel for testing, ringing and DTMF generation

? 1 programmable FSK generator for sending Caller-ID messages

? Two programmable chopper clocks

? Master clock frequency selectable: 1.536 MHz, 1.544 MHz, 2.048 MHz, 3.072 MHz, 3.088 MHz, 4.096 MHz, 6.144 MHz, 6.176 MHz or 8.192 MHz

? Advanced test capabilities:

- 3 analog loopback tests

- 5 digital loopback tests

- Level metering function

? High analog driving capability (300 ? AC)

? TTL/CMOS compatible digital I/O

? CODEC identification

? +5 V single power supply

? Low power consumption

? Operating temperature range: -40°C to +85°C

? Package available: 64 Pin PQFP