IDT821068 Просмотр технического описания (PDF) - Integrated Device Technology
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IDT821068 Datasheet PDF : 45 Pages
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IDT821068 OCTAL PROGRAMMABLE PCM CODEC
INDUSTRIAL TEMPERATURE RANGE
DESCRIPTION
The IDT821068 is a feature rich, single-chip, programmable 8
channel PCM CODEC with on-chip filters. Besides the A-Law/µ-Law
companding and linear coding/decoding (16-bit 2’s complement),
IDT821068 provides 2 programmable Tone generators per channel
(which can also generate ring signals), 1 FSK generator, 1 program-
mable Teletax Signal generator and 2 programmable chopper clocks
for SLIC.
The digital filters in IDT821068 provide the necessary transmit and
receive filtering for voice telephone circuit to interface with time-division
multiplexed systems. An integrated programmable DSP realizes AC
Impedance Matching, Transhybrid Balance, Frequency Response
Correction and Gain Setting functions. The IDT821068 supports 2
PCM buses with programmable sampling edge, that allows an extra
delay of up to 7 clocks. Once the delay is determined, it is effective to
all eight channels of IDT821068. The device also provides 7 signaling
pins to SLIC on per channel basis.
The IDT821068 provides 2 programming interfaces:
Microprocessor Interface (MPI) and General Control Interface (GCI),
which is also known as ISDN Oriented Module (IOM®-2). For both
MPI and GCI programming, the device supports both compressed
and linear data format.
The device also 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
IDT821068. When off-hook signal is detected, IDT821068 can reverse
an output pin to stop ringing immediately.
The IDT821068 can be used in digital telecommunication
applications such as Central Office Switch, PBX, DLC and Integrated
Access Device (IAD), i.e. VoIP and VoDSL.
PIN CONFIGURATIONS
SB2_5 103
SO1_5 104
SO2_5 105
SO3_5 106
GND56 107
MPI 108
CS 109
CCLK/TS 110
CI/DOUBLE 111
CO 112
INT 113
NC 114
NC 115
NC 116
NC 117
NC 118
NC 119
NC 120
NC 121
RESET 122
NC 123
GND12 124
SO3_1 125
SO2_1 126
SO1_1 127
SB2_1 128
IDT821068
128 PIN PQFP
64 SB2_8
63 SO1_8
62 SO2_8
61 SO3_8
60 GND78
59 GNDDP
58 NC
57 CHCLK1
56 CHCLK2
55 VDDDP
54 MCLK
53 BCLK/DCL
52 FS/FSC
51 NC
50 TSX2
49 DX2
48 DR2
47 TSX1
46 DX1/DU
45 DR1/DD
44 NC
43 GND34
42 SO3_4
41 SO2_4
40 SO1_4
39 SB2_4
IOM®-2 is a registered trademark of Siemens AG.
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