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參數(shù)資料
| 型號： | MSM7542 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 元件分類： | Codec |
| 英文描述： | Single Rail CODEC |
| 中文描述： | 單鐵編解碼器 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大小： | 154K |
| 代理商： | MSM7542 |
Semiconductor
MSM7541/7542
4/20
PIN AND FUNCTIONAL DESCRIPTIONS
AIN+, AIN–, GSX
Transmit analog input and transmit level adjustment.
AIN+ is a non-inverting input to the op-amp; AIN– is an inverting input to the op-amp; GSX is
connected to the output of the op-amp and is used to adjust the level, as shown below.
When not using AIN– and AIN+, connect AIN– to GSX and AIN+ to SG. During power saving
and power down modes, the GSX output is at AG voltage.
AG
Analog signal ground.
VFRO
Receive filter output.
The output signal has an amplitude of 2.0 V
PP
above and below the signal ground voltage (SG)
when the digital signal of +3 dBmO is input to PCMIN and can drive a load of 20 k
W
or more.
For driving a load of 20 k
W
or less, the output signal of AOUT+ and AOUT– is available.
To apply the output signal of AOUT+ and AOUT– for driving, connect a resistor of 20 k
W
or more
between the pins VFRO and PWI.
When adding the frequency characteristics to the receive signal, refer to the application example.
During power saving or power down mode, the output of VFRO is at the voltage level of AG.
–
+
AIN–
AIN+
SG
C1
Analog input
1) Inverting input type
R1 : variable
R2 > 20 k
W
C1 > 1/(2
￥
3.14
￥
30
￥
R1)
Gain = R2/R1
￡
10
R2
GSX
+
–
AIN+
AIN–
GSX
2) Non inverting input type
R3 > 20 k
W
R4 > 20 k
W
R5 > 50 k
W
C2 > 1/ (2
￥
3.14
￥
30
￥
R5)
Gain = 1 + R4 / R3
￡
10
R4
SG
C2
Analog input
R3
R5
R1
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|---|---|
| MSM7543 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Single Rail CODEC |
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