CXA2093 데이터 시트보기 (PDF) - Sony Semiconductor

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CXA2093

Sharpness for Display

Sony Semiconductor 

CXA2093S

Description of Operation

1. Video signal system

RGB signals input to Pins 1, 3 and 5 is synchronous clamped by the clamp pulse input from Pin 13. This RGB

signals are mixed in the ratio of 0.6G + 0.3R + 0.1B, and Y signal is generated. The high frequency component

is pulled out from a Y signal through a differential circuit, and the amplitude is varied according to the gain

control circuit. The selecting of gain control and differential circuit time constant is performed by the DC voltage

input from Pin 12. Gain controlled signal is output from Pin 15 after amplitude limited from a limiter circuit. At

the same time, its signal is added to RGB signals input to Pins 1, 3 and 5, and then is output from Pins 17, 19

and 21.

Sharpness Min.

F0_GAIN = 0.5V/3.0V

No sharpness component

100%

Sharpness Max.

F0_GAIN = 2.0V/4.5V

100%

(0.7Vp-p)

50ns

100ns

Portion that are not output from limiter

Limiter level

Approx. 0.2V

10%

Time constant

F0_GAIN = 0.5V to 2.0V; 50ns

F0_GAIN = 3.0V to 4.5V; 100ns

2. Synchronous system

The sync on green signal input to Pin 7 is synchronous separated by the sync separation circuit after diode

clamped, and is output from Pin 14 as a positive polarity pulse.

The input signal is not sync on green signal, video portion is sliced and then is output as a positive polarity

pulse.

–9–

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