Features: *4-channel CODEC with on-chip digital filters
*Software selectable A/P-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
*1 programmable FSK generator for sending Caller-ID messages
*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 PQFPPinout
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 |
|
1.5 |
W |
| Storage temperature |
-65 |
+150 |
|
Description The IDT821054 is a feature rich, single-chip, programmable 4-channel PCM CODEC with on-chip filters. Besides the
P-Law/A-Law companding and linear coding/decoding (14 effective bits + 2 extra sign bits), the IDT821054 also provides 1 FSK generator for sending Caller-ID messages, 2 programmable tone generators per channel (which can generate ring signals) and 2 programmable chopper clocks for SLICs.
The digital filters in the IDT821054 provide necessary transmit and receive filtering for voice telephone circuits to interface with time-division multiplexed systems. An integrated programmable DSP realizes AC mpedance matching, transhybrid balance, frequency response correction and gain adjustment functions. The IDT821054 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 IDT821054. The device also provides 7 signaling pins per channel for SLICs.
The IDT821054 is programmed via a Microprocessor Interface (MPI).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 th 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.
IDT821054 Data Sheet
