la7567b Sanyo Semiconductor Corporation, la7567b Datasheet - Page 11

• 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

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Pin No.
10
11
12
13
14
15
Composite video output
RF AGC OUTPUT
1st SIF INPUT
AFT OUTPUT
VCO tank
Pin
• Output for the video signal that includes the SIF carrier.
• VCO tank circuit used for video signal detection.
• AFT output. The AFT center voltage is generated by an
• RF AGC output. This output controls the tuner RF AGC.
• First SIF input. A DC cut capacitor must be used in the
• If a SAW filter is used:
• When used in an intercarrier system:
A resistor must be inserted between pin 10 and ground to
acquire adequate drive capability.
R ≥ 300 Ω
See the coil specifications provided separately for details
on the tank circuit. This VCO is a vector synthesis VCO.
external bleeder resistor. The AFT gain is increased by
increasing the resistance of this external bleeder resistor.
However, this resistor must not exceed 390 kΩ.
This circuit includes a control function that controls the AFT
voltage to naturally approach the center voltage during
weak field reception.
A protective 100-Ω resistor is inserted in series with the
open collector output. Determine the external bleeder
resistor value in accordance with the specifications of the
tuner.
input circuit.
The first SIF sensitivity can be increased by inserting an
inductor between the SAW filter and the IC to neutralize the
SAW filter output capacitance and the IC input
capacitance.
This pin (pin 15) may be left open.
Description
LA7567B, 7567BM
to tuner
9 V
11
2 k
2 k
15 pF
Equivalent circuit
2 k
15
14
12
100
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13
No. 6099-11/15
10
A12036
A12035
A12039
A12038
A12037