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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)： | 5/25頁 |
| 文件大小： | 153K |
| 代理商： | MSM7557 |
5/25
MSM7557
Semiconductor
(Continued)
Name
VR1
VR2
VR3
Modulator output level control.
Refer to the following figure.
Description
+
–
From modulator
+
–
To transmit filter
VR1
VR2
VR3
R1
R2
R1
≥
40 k
W
R2
≥
40 k
W
R1
≥
R2
+
–
C1
R3
R5
C2
R4
C3
TVIO
TVI
SG
VTVI
CMPI
Compressor
R5
≥
60 k
W
C1 and C19 are used for DC cut.
Example of fc = 10 kHz and 0 dB gain
R3 = R4 = R5 = 68 k
W
C1 = 0.22
m
F, C2 = 510 pF, C3 = 110 pF
C19
TVIO
TVI
CC1
CC2
CC3N
CC3P
V
TAO
= 20
￥
log (R2/R1) – 9 dBV (DYN = "0" )
V
TAO
= 20
￥
log (R2/R1) – 1 dBV (DYN = "1" )
This level is made from internal voltage reference, so this level doesn't depend on power supply voltage.
Transmit side RC active filter input (TVI) and output (TVIO).
If over 50 kHz frequency element is in the input signal, folding noise is generated from internal SCF
circuit, so second order RC-active filter is needed. (fc = 10 kHz)
When digital "1" is applied to TVE pin, transmit voice signal comes out to TAO.
Capacitor connection pins to remove for DC offset of the compressor.
A 1
m
F capacitor between SG pin and each pin should be connected.
Capacitor connection pins for the compressor attack and recovery time.
When DYN is digital "0" level, a 0.22
m
F capacitor should be connected between CC3N and CC3P.
And when DYN is digital "1" level, a 0.47
m
F capacitor should be connected between them.
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