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LA7567GM Arkusz danych(PDF) 10 Page - Sanyo Semicon Device

Numer części LA7567GM
Szczegółowy opis  TV and VCR VIF/SIF IF Signal-Processing Circuit with NTSC SPLIT Support
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Producent  SANYO [Sanyo Semicon Device]
Strona internetowa  https://www.sanyo-av.com/us/
Logo SANYO - Sanyo Semicon Device

LA7567GM Arkusz danych(HTML) 10 Page - Sanyo Semicon Device

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No. 6803-10/14
LA7567GM
Continued from preceding page.
Pin No.
Pin
Description
Equivalent circuit
10
Composite video output
• Output for the video signal that includes the SIF carrier.
A resistor must be inserted between pin 10 and ground to
acquire adequate drive capability.
R
≥ 430 Ω
10
2k
15pF
A13686
11
12
VCO tank
• VCO tank circuit used for video signal detection.
See the coil specifications provided separately for details
on the tank circuit. This VCO is a vector synthesis VCO.
11
12
A13687
13
AFT OUTPUT
• AFT output. The AFT center voltage is generated by an
external bleeder resistor. The AFT gain is increased by
increasing the resistance of this external bleeder resistor.
However, this resistor must not exceed 390 k
Ω.
This circuit includes a control function that controls the AFT
voltage to naturally approach the center voltage during
weak field reception.
13
A13688
14
RF AGC OUTPUT
• RF AGC output. This output controls the tuner RF AGC.
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.
14
100
To tuner
9V
A13689
15
1st SIF INPUT
• First SIF input. A DC cut capacitor must be used in the
input circuit.
• If a SAW filter is used:
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.
• When used in an intercarrier system:
This pin (pin 15) may be left open.
2k
2k
A13690
15
Continued on next page.


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