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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)： | 6/25頁 |
| 文件大?。?/td> | 153K |
| 代理商： | MSM7557 |
6/25
MSM7557
Semiconductor
(Continued)
Name
Description
ME
TVE
TAO
X : Don't care
RVE
RVO
0
1
Output disable (potential = SG)
Output enable
CMPI
DYN
SG
GND
TAO
RVO
CE1
CE2
CE3N
CE3P
RAIO
RAI
CSH
0
0
1
0
1
X
No signal output (potential = SG)
Voice signal output
MSK modulator output
Compressor circuit input.
A 0.47
m
F capacitor should be connected between CMPI and TVIO.
Dynamic range control input.
For an application of which V
DD
is always higher than 4.5 V (Base station), by setting DYN = "1",
modem transmit carrier level, typical input signal level, limiter clamp level and compandor
standard input level are up about 8dB to improve S/N ratio.
For an application of which V
DD
is lower than 4.5 V (Hand-set) DYN shall be digital "0".
To make easier interface with the RF part, one solution is to put digital "0" on DYN pin for both Base
station and Handset.
Built-in analog signal ground. The DC voltage is half of V
DD
.
To make this voltage source impedance lower and to ensure the device performance, it is necessary to
put a bypass capacitor of more than 1
m
F between SG and V
DD
in close physical proximity to the device.
Ground pin, (0V).
Transmit analog signal output.
According to control data on ME and TVE, TAO is set as follows.
Receive voice signal output.
RVO pin state is defined by RVE control.
Capacitor connection pins to remove DC offset of the expander.
A 1
m
F capacitor between SG pin and each pin should be connected.
Capacitor connection pins for the expander attack time and recovery time.
When DYN is digital "0" level, a 0.22
m
F capacitor should be connected between CE3N and CE3P.
And when DYN is digital "1" level, a 0.47
m
F capacitor should be connected between them.
Receive side amplifier input (RAI) and output (RAIO).
Second order RC-active filter is needed like TVIO and TVI.
Refer to TVIO and TVI pin description.
Capacitor connection pin to remove DC offset of the modem shaper circuit.
A 1
m
F capacitor should be connected between GND pin and CSH.
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