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參數資料
| 型號： | LA75675M-S |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO/VIDEO DEMODULATOR, PDSO24 |
| 封裝： | MFP-24 |
| 文件頁數： | 3/13頁 |
| 文件大小： | 133K |
| 代理商： | LA75675M-S |
No. 6276-11/13
LA75675M-S
Continued from preceding page.
Pin No.
Pin
Function
Equivalent circuit
RF AGC adjustment
This pin sets the tuner's RF AGC operating point. Both
the FM output and the video output can be muted by
setting this pin to the ground level.
21
RF AGC VR
20 k
20 k
560
A12632
21
4.2 V
Bandpass filter output
The output to the external bandpass filter is passed
through an internal 6 dB amplifier before being output.
22
BPF-out
A12633
22
200
Filter that holds the FM detector output DC voltage
fixed.
Normally, a 1 F electrolytic capacitor is used. If the
low band (around 50 Hz) frequency characteristics are
of concern, this value should be increased. The FM
detection output level can be reduced and the FM
dynamic range improved by inserting the resistor R in
series with the capacitor between pin 23 and ground.
23
FM filter
1 k
1 k
A12634
23
C
+
R
Audio FM detector output
This is an emitter-follower circuit with a 300
resistor
inserted in series.
Stereo applications
In some application that provide input to a stereo
decoder, the input impedance may be reduced,
resulting in distortion in the L-R signal and degraded
stereo characteristics. If this problem occurs, add a
resistor between pin 24 and ground.
R1
≥ 5.1 k
Mono applications
Construct an external deemphasis circuit.
t = CR2
24
FM detector output
R2
300
10 k
C
R1
A12635
24
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