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IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE
INDUSTRIAL TEMPERATURE RANGE
DESCRIPTION
The IDT821054 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 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
impedance 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 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.
PIN CONFIGURATION
SI2_2
SI1_2
SB3_2
SB2_2
SB1_2
SO2_2
SO1_2
SO1_1
SO2_1
SB1_1
SB2_1
SB3_1
SI1_1
SI2_1
IN
T1
2
CHCLK1
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
VIN1
GNDA1
VOUT1
VDDA12
VOUT2
GNDA2
VIN2
CNF
VDDB
VIN3
GNDA3
VOUT3
VDDA34
VOUT4
GNDA4
VIN4
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
SI2_3
SI1_3
SB3_3
SB2_3
SB1_3
SO2_3
SO1_3
SO1_4
SO2_4
SB1_4
SB2_4
SB3_4
SI1_4
SI2_4
IN
T3
4
CHCLK2
BCLK
FS
DR2
DX2
TSX2
DR1
DX1
TSX1
VDDD
RESET
MCLK
GNDD
CO
CI
CCLK
CS
IDT821054
64 Pin PQFP
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