LA75503V View Datasheet(PDF) - SANYO -> Panasonic
Part Name
Description
Manufacturer
LA75503V Datasheet PDF : 15 Pages
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LA75503V
Continued from preceding page.
Pin No.
Pin name
Pin function
16
AFT OUT
Pin 16 is the AFT output pin.
Use external resistors of 47kΩ and a filter
capacitance 0.1µF.
The AFT circuit generates the AFT voltage by
comparing the signal obtained by dividing the
4MHz reference frequency with the signal
obtained by dividing VCO.
Since it uses a digital phase comparator, a dead
zone exists in the AFT center.
waveform
Equivalent circuit
17
RF AGC OUT
Pin 17 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 30kΩ is used for R1, but if the tuner's F/E
transistor is GaAS, the gate's impedance is lower, Comparator
so use approx. 10kΩ.
18
IF AGC FILTER Pin 18 is the IF AGC filter pin.
Normally, 0.01µF to 0.02 µF polyester film
capacitor is used.
Determine the impedance based on H-SAG and
AGC speed.
19
NC
Not connected.
Continued on next page.
No.6804-10/15
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