HA11560 Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

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HA11560

VCR/VDP RF Modulator

Hitachi -> Renesas Electronics 

HA11560FP/T

Block Operation Descriptions

The following describes the operation of each

block and external circuits.

Video Clamp

The video clamp circuit employs a sync peak value

clamp. Input impedance is at a level of

approximately 30 kΩ to reduce compression of the

sync pulse. Note that sag is generated in the sync

pulse when a capacitor of 0.47 µF or lower is used

for C10 at pin 16.

White Clip Circuit

The white clip level is set to 92.5%. A circuit that

produces a sharp white clip is used in order to

produce high linearity characteristics for the video.

Increasing the white clip frequency characteristic

by another 5 MHz eliminates video carrier cutoff

by the chroma signal and prevents deterioration of

audio buzz characteristics.

Video in

+ 16

C10

1 µF

White clip

circuit

White clip level

HA11560

white clip

characteristics

Normal

white clip

characteristics

Figure 1 Video Input Circuit

Figure 2 White Clip Characteristics

5

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