DESCRIPTION

The IDT821068 is a feature rich, single-chip, programmable 8 channel PCM CODEC with on-chip filters. Besides the A-Law/m-Law companding and linear coding/decoding (16-bit 2’s complement), IDT821068 provides 2 programmable Tone generators per channel (which can also generate ring signals), 1 FSK generator, 1 programmable Teletax Signal generator and 2 programmable chopper clocks for SLIC.

FEATURES

? 8 channel CODEC with on-chip digital filters

? Programmable A/m-law compressed or linear code conversion

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

? Programmable digital filter adapting to system demands:

- AC impedance matching

- Transhybrid balance

- Frequency response correction

- Gain setting

? Supports two programmable PCM buses and one GCI bus

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

? Broadcast mode for coefficient setting

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

? Fast hardware ring trip mechanism

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

? Programmable teletax signal generation (12 kHz or 16 kHz)

? FSK generator

? 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 W AC)

? TTL and CMOS compatible digital I/O

? CODEC identification

? +5 V single power supply

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

? Package available: 128 pin PQFP