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參數(shù)資料
| 型號： | IDT821054PQF |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 編解碼器 |
| 英文描述： | QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE |
| 中文描述： | A/MU-LAW, PCM CODEC, PQFP64 |
| 封裝： | PLASTIC, QFP-64 |
| 文件頁數(shù)： | 9/45頁 |
| 文件大小： | 506K |
| 代理商： | IDT821054PQF |
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9
IDT821054 QUAD PROGRAMMABLE PCM CODEC WITH MPI INTERFACE INDUSTRIAL TEMPERATURE RANGE
2
FUNCTIONAL DESCRIPTION
The IDT821054 is a four-channel PCM CODEC with on-chip digital
filters. It provides a four-wire solution for the subscriber line circuitry in
digital switches. The IDT821054 converts analog voice signals to digital
PCM samples and digital PCM samples back to analog voice signals.
The digital filters are used to bandlimit the voice signals during
conversion.
High
performance
Converters (ADC) and Digital-to-Analog Converters (DAC) in the
IDT821054 provide the required conversion accuracy. The associated
decimation and interpolation filtering is performed by both dedicated
hardware and Digital Signal Processor (DSP). The DSP also handles all
other necessary procession such as PCM bandpass filtering, sample
rate conversion and PCM companding.
oversampling
Analog-to-Digital
2.1
MPI/PCM INTERFACE
A serial Microprocessor Interface (MPI) is provided for the master
device to control the IDT821054. Two PCM buses are provided to
transfer the digital voice data.
2.1.1
MICROPROCESSOR INTERFACE (MPI)
The internal configuration registers (local/global), the SLIC signaling
interface and the Coefficient-RAM of the IDT821054 are programmed by
the master device via MPI, which consists of four lines (pins): CCLK,
CS
,
CI and CO. All commands and data are aligned in byte (8 bits) and
transferred via the MPI interface. CCLK is the clock of the MPI interface.
The frequency of CCLK can be up to 8.192 MHz.
CS
is the chip
selection pin. A low level on
CS
enables the MPI interface. CI and CO
are data input and data output pins, carrying control commands and
data bytes to/from the IDT821054.
The data transfer is synchronized to the CCLK signal. The contents
of CI is latched on the rising edges of CCLK, while CO changes on the
falling edges of CCLK. The CCLK signal is the only reference of CI and
CO pins. Its duty and frequency may not necessarily be standard.
When the
CS
pin becomes low, the IDT821054 treats the first byte on
the CI pin as command and the rest as data. To write another command,
the
CS
pin must be changed from low to high to finish the previous
command and then changed from high to low to indicate the start of a
new command. When a read/write operation is completed, the
CS
pin
must be set to high in 8-bit time.
During the execution of commands that are followed by output data
byte(s), the IDT821054 will not accept any new commands from the CI
pin. But the data transfer sequence can be interrupted by setting the
CS
pin to high at any time. See
Figure - 1
and
Figure - 2
for examples of
MPI write and read operation timing diagrams.
Figure - 1 An Example of the MPI Interface Write Operation
Figure - 2 An Example of the MPI Interface Read Operation (ID = 81H)
7
6
5
4
3
2
1
0
Command Byte
Data Byte 1
Data Byte 2
High 'Z'
CCLK
CI
CO
CS
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
Command Byte
Identification Code
Data Byte 1
High 'Z'
'0'
'0'
'0'
'0'
'0'
'0'
'1'
'1'
6
5
4
3
2
1
0
7
Ignored
CCLK
CI
CO
7
6
5
4
3
2
1
0
CS
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| IDT821064 | QUAD PROGRAMMABLE PCM CODEC WITH GCI INTERFACE |
| IDT821064PQF | QUAD PROGRAMMABLE PCM CODEC WITH GCI INTERFACE |
| IDT821068 | OCTAL PROGRAMMABLE PCM CODEC |
| IDT821068PX | OCTAL PROGRAMMABLE PCM CODEC |
| IDT821621 | LONG HAUL SLIC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IDT821054PQFG | 功能描述:IC PCM CODEC QUAD MPI 64-PQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 編解碼器 系列:- 標準包裝:2,500 系列:- 類型:立體聲音頻 數(shù)據(jù)接口:串行 分辨率（位）:18 b ADC / DAC 數(shù)量:2 / 2 三角積分調(diào)變:是 S/N 比，標準 ADC / DAC (db):81.5 / 88 動態(tài)范圍，標準 ADC / DAC (db):82 / 87.5 電壓 - 電源，模擬:2.6 V ~ 3.3 V 電壓 - 電源，數(shù)字:1.7 V ~ 3.3 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-TQFN-EP（7x7） 包裝:帶卷 (TR) |
| IDT821064 | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:QUAD PROGRAMMABLE PCM CODEC WITH GCI INTERFACE |
| IDT821064PQF | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:QUAD PROGRAMMABLE PCM CODEC WITH GCI INTERFACE |
| IDT821068 | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:OCTAL PROGRAMMABLE PCM CODEC |
| IDT821068PX | 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:OCTAL PROGRAMMABLE PCM CODEC |
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