參數(shù)資料
型號(hào)： LA75505M
文件頁(yè)數(shù)： 11/13頁(yè)
文件大?。?/td> 224K
代理商： LA75505M
No. 6930-11/13
LA75505M
Continued from preceding page.
Pin No.
Pin
Pin Function
Internal Circuit
22
SIF PLL FILTER
Pin 22 is the SIF PLL filter pin.
Normally use the following values.
R: 3 k
C1: 0.01 μF
C2: 1000 pF
When R is too large, the PLL may become
unlocked, so use a resistance value within 6 k
. A
smaller R value results in low-pass noise.
Pin 23 is the RF AGC VR pin.
When this pin is connected to GND, no signal is
appeared on pin 4 and pin 24.
23
RF AGC VR
24
FM DET OUT
Pin 24 is the FM output pin.
Time constance of de-emphasis is determined by
external C, R.
Please chose C, R to make time constance 75 μs.
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