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参数资料
| 型号： | LA75505M |
| 元件分类： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封装： | 0.300 INCH, MFP-24 |
| 文件页数： | 13/13页 |
| 文件大小： | 224K |
| 代理商： | LA75505M |
No. 6930-9/13
LA75505M
Continued from preceding page.
Pin No.
Pin
Pin Function
Internal Circuit
Pin 14 is the RF AGC output.
RF AGC max is determined by R1 and R2.
RF AGC min is determined by R3 and R4.
Capacitor C1 prevents oscillation and capacitor C2
is the RF AGC filter.
Normally 30 k
is used for R1, but if the tuner's F/E
transistor is GaAS, the gate's impedance is lower,
so use approx. 10 k
.
14
RF AGC OUT
Pin 15 is the IF AGC filter pin.
Normally, 0.01 F to 0.02 F polyester film
capacitor is used.
Determine the impedance based on H-SAG and
AGC speed.
15
IF AGC FILTER
Continued on next page.
Pin 16 can be used both as the First SIF IN and
inter/split switch pins.
In the case of inter carrier, connect pin 16 to GND.
When a sound saw filter is added, the matching
loss can be decreased by inserting L to neutralize
the IC input capacitance and saw filter output
capacitance.
16
1st SIF INPUT
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