821054PQF

Product Summary

IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACEDESCRIPTIONThe IDT821054 is a feature rich, single-chip, programmable 4-channel PCM CODEC with on-chip filters. Besides thecompanding and linear coding/decoding (14 effective bits + 2 extra signbits), the IDT821054 also provides 1 FSK generator for sending Caller-ID messages, 2 programmable tone generators per channel (which cangenerate ring signals) and 2 programmable chopper clocks for SLICs.The digital filters in the IDT821054 provide necessary transmit andreceive filtering for voice telephone circuits to interface with time-divisionmultiplexed systems. An integrated programmable DSP realizes ACimpedance matching, transhybrid balance, frequency responsecorrection and gain adjustment functions. The IDT821054 supports 2PCM buses with programmable sampling edge, which allows an extradelay of up to 7 clocks. Once the delay is determined, it is effective to allPIN CONFIGURATION49VIN150GNDA151VOUT152VDDA1253VOUT254GNDA255VIN256CNF57VDDB58VIN359GNDA360VOUT361VDDA3462VOUT463GNDA464VIN4four channels of the IDT821054. The device also provides 7 signalingpins per channel for SLICs.The IDT821054 is programmed via a Microprocessor Interface (MPI). -Law/A-Law μ Two PCM buses are provided to transfer the compressed or linear PCM data. The device offers strong test capability with several analog/digital loopbacks and level metering function. It brings convenience to system maintenance and diagnosis. A unique feature of “Hardware Ring Trip” is implemented in the IDT821054. When an off-hook signal is detected, the IDT821054 will reverse an output pin to stop the ringing signal immediately. The IDT821054 can be used in digital telecommunication applications such as Central Office Switch, PBX, DLC and Integrated Access Devices (IADs), i.e. VoIP and VoDSL

Parametrics

Specifications of 821054PQF
Package 64PQFP Number Of Channels 4ADC /4 DAC
Number Of Dacs 4 Operating Supply Voltage 5 V

Features

4-channel CODEC with on-chip digital filters? Software selectable A/-law, linear code conversionμ? 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 mechanismFUNCTIONAL BLOCK DIAGRAMFilter and A/DVIN1D/A and FilterVOUT12 Inputs3 I/OsSLIC Signaling2 OutputsMCLKPLL and ClockCHCLK1GenerationCHCLK2The IDT logo is a registered trademark of Integrated Device Technology, Inc.INDUSTRIAL TEMPERATURE RANGE?2003 Integrated Device Technology, Inc.? 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, 2.048MHz, 3.072 MHz, 3.088 MHz, 4.096 MHz, 6.144 MHz, 6.176 MHz or8.192 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 PQFP

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