la7567b Sanyo Semiconductor Corporation, la7567b Datasheet - Page 13

• Manufacturer Part Number: la7567b
• Description: Tv And Vcr Vif/sif If Signal-processing Circuit With Pal/ntsc Multi-format Audio Support
• Manufacturer: Sanyo Semiconductor Corporation

Continued from preceding page.
Pin No.
21
22
23
24
FM Detector output
NICAM output
RF AGC VR
FM filter
Pin
• RF AGC VR connection.
• First SIF output.
• Connection for a filter used to hold the FM detector output
• Audio FM detector output. A 300-Ω resister is inserted in
• For applications that support stereo:
• For applications that support mono:
This pin sets the tuner RF AGC operating point. Also, the
FM output and the video output can both be muted at the
same time by connecting this pin to ground.
Internally, this is an emitter-follower output with a 600-Ω
resistor attached. When used in an intercarrier system, the
buzz characteristics can be improved by forming a
chrominance carrier trap with this pin.
DC voltage fixed. Normally, a 1-µF electrolytic capacitor
should be used. The capacitance should be increased if
the low band (around 50 Hz) frequency characteristics
need to be improved.
The FM detector output level can be reduced and the FM
dynamic range can be increased by inserting a resistor and
a capacitor in series between pin 23 and ground.
series with an emitter-follower output.
Applications that input this signal to a stereo decoder may
find that the input impedance is reduced, the left and right
signals are distorted, and that the stereo characteristics are
degraded. If this problem occurs, add a resistor between
pin 24 and ground.
R1 ≥ 5.1 kΩ
Create an external deemphasis circuit.
t = C
R2
22
Forms a chrominance killer trap.
Description
LA7567B, 7567BM
A12044
C
20 k
4.2 V
R2
R1
1 k
Equivalent circuit
20 k
20 k
24
20 k
23
1 k
22
300
R
620
+
C
21
560
6 k
10 k
No. 6099-13/15
A12043
A12045
A12046