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