DESCRIPTION

The IDT821064 is a feature rich, single-chip, programmable 4 channel PCM CODEC with on-chip filters. Besides the m-Law/A-Law companding and linear coding/decoding (14 effective bits + 2 extra sign bits), IDT821064 also provides 1 FSK generator (can be used for sending Caller-ID messages), 2 programmable Tone generators per channel (which can also generate ring signals) together with 2 programmable chopper clocks for SLIC.

FEATURES

? 4 channel CODEC with on-chip digital filters

? Software selectable compressed (A/m-law) 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

? GCI (IOM-2) control interface

? 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

? FSK generator

? Two programmable chopper clocks

? Master clock frequency selectable: 2.048 MHz or 4.096 MHz

? Advanced test capabilities

- 3 analog loop back tests

- 5 digital loop back tests

- Level metering function

? High analog driving capability (300W AC )

? TTL and 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