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LA75503V 数据表(PDF) 10 Page - Sanyo Semicon Device |
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LA75503V 数据表(HTML) 10 Page - Sanyo Semicon Device |
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10 / 15 page  LA75503V No.6804-10/15 Continued from preceding page. Pin No. Pin name Pin function Equivalent circuit 16 AFT OUT Pin 16 is the AFT output pin. Use external resistors of 47k Ω and a filter capacitance 0.1 µF. 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 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 30k Ω is used for R1, but if the tuner's F/E transistor is GaAS, the gate's impedance is lower, so use approx. 10k Ω. Comparator 18 IF AGC FILTER Pin 18 is the IF AGC filter pin. Normally, 0.01 µF 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. |
类似零件编号 - LA75503V |
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类似说明 - LA75503V |
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