- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄378017 > MSM7557 (OKI SEMICONDUCTOR CO., LTD.) Single Chip MSK Modem with Compandor for Cordless Telephone PDF資料下載
參數(shù)資料
| 型號： | MSM7557 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Single Chip MSK Modem with Compandor for Cordless Telephone |
| 中文描述： | 單芯片MSK調(diào)制解調(diào)器無繩電話與Compandor |
| 文件頁數(shù)： | 4/25頁 |
| 文件大?。?/td> | 153K |
| 代理商： | MSM7557 |
4/25
MSM7557
Semiconductor
PIN DESCRIPTION
Name
SD
EMP
Pre-emphasis circuit is bypassed to the
path
Pre-emphasis circuit is connected to the
path
De-emphasis circuit is bypassed to the
path
De-emphasis circuit is connected to the
path
Description
t
MS
ME
SD input
ST
Modulator
input data
Transmit side
Receive side
DYN
0
1
0.50 V
1.26 V
–9 dBV
–1 dBV
Internal clamp level
Limiter level
ST
EMP
LIM
0
1
Transmit data input.
The data on SD pin are took into MSK modulator and the data are available on the positive edge of ST.
In order to synchronize a receive modem, more than 18bits bit-synchronous signal should be
transmitted before data transmission. If S/N ratio of the receive signal is always good, more than
11bits bit-synchronous signal synchronizes the receiver.
Transmit data timing clock output.
When digital "0" is put on ME pin, ST is fixed to digital "1" level.
Emphasis path selection.
Deviation limiter control.
Voice signal maximum Rf modulation level is controlled by connecting external reference voltage to
this pin.
Input impedance of this pin is about 200 k
W.
When this pin is left open, internal reference voltage is used as the clamp level.
Internal clamp level is as follows.
This internal clamp level is made by internal reference voltage which is unrelated with V
DD
.
Negative clamp level is made by internal operational amplifier and the voltage is reversed at VSG.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MSM7564-01 | CONNECTOR ACCESSORY |
| MSM7570-01 | Multi-Function ADPCM CODEC(多功能ADPCM編碼譯碼器) |
| MSM7575 | Multi-Function ADPCM CODEC(多功能ADPCM(自適應(yīng)差分脈沖編碼調(diào)制）編碼譯碼器) |
| MSM7576 | LSI |
| MSM7577 | Voice Signal Level Control LSI |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MSM7560 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Single Rail ADPCM CODEC |
| MSM7560L | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Single Rail ADPCM CODEC |
| MSM7564-01 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:A Single Chip 14.4 kbps Data & Fax Modem |
| MSM7566 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Single Rail CODEC |
| MSM7566GS-K | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Single Rail CODEC |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。