IDT821054A

Features:

4-channel CODEC with on-chip digital filters
Software selectable A/-law, linear code conversion
Meets ITU-T G.711 - G.714 requirements
Programmable digital filters adapting to 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
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 TQFP


Pinout




Specifications

Ratings	Min.	Max.	Unit
Power supply voltage		6.5	V
Voltage on Any Pin with respect to ground	-0.5	5.5	V
Package power dissipation		1	W
Storage temperature	-65	+150

Description

The IDT821054A is a feature rich, single-chip, programmable 4- channel PCM CODEC with on-chip filters. Besides the -Law/A-Law companding and linear coding/decoding (14 effective bits + 2 extra sign bits), the IDT821054A also provides 2 programmable tone generators per channel (which can generate ring signals) and 2 programmable chopper clocks for SLICs.

The digital filters in the IDT821054A provide necessary transmit and receive filtering for voice telephone circuits to interface with time-division multiplexed systems. An integrated programmable DSP realizes AC impedance matching, transhybrid balance, frequency response correction and gain adjustment functions. The IDT821054A supports 2 PCM buses with programmable sampling edge, which allows an extra delay of up to 7 clocks. Once the delay is determined,it is effective to all four channels of the IDT821054A. The device also provides 7 signaling pins per channel for SLICs.