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參數(shù)資料
| 型號： | LC75100M |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDSO36 |
| 封裝： | 0.375 INCH, MFP-36 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大小： | 270K |
| 代理商： | LC75100M |
LC75100M
No.A1021-13/14
Setting the Mic Amplifier Gain
The mic amplifier gain can be adjusted by the resistors connected to pins 3 and 34. Moreover, the low frequency region
can be cut off by connecting a capacitor. The mic amplifer has a built-in ALC (Auto Level Control) and the output level
can be controlled by applying the reference voltage to pin 1.
(1) Setting the mic AMP gain
R1=562.3kΩ, R2=1.0kΩ
[When Mic Gain=45dB]
R4=(R1/Mic Gain)-R2
=562.3k/177.8-1k
≈2.2kΩ
(2) Determining the fc
(3) Setting the ALC operating voltage
VREF
+
-
ALC
2
4
3
5
R1
R2
R3
R4
C1
1k)C1
(R1
2
1
fc
π
+
=
1/2 VCC
1/2 VCC-1.41V
0V
1/2 VCC+1.41V
1.0Vrms
VALC = 1/2 VCC-1.41V
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