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 Ω 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