CXA1785AR View Datasheet(PDF) - Sony Semiconductor

Part Name

Description

View to exact match

CXA1785AR

RGB Decoder/Driver

Sony Semiconductor 

CXA1785AR

Pin No. Symbol Pin voltage

36 SYNC IN

37 SYNC OUT

38 SYNC SEP 1.8V

Equivalent circuit

VCC1

36

VEE

Vcc1

37

GND

VEE

VCC1

GND

Description

High level input when synchro-

nized; low level at all other

times. The rising edge of the

input pulse must precede the

falling edge of the SYNC OUT

pulse. For PAL, the internal flip

flop switches at the rising edge

of the input pulse.

Outputs the sync signal

separated by the sync

separation circuit. High level

when synchronized and at low

level in all other cases. This

pin is of an open collector

output. The high level for the

output should be VEE + 15 V or

less.

Sync separation circuit input.

Input the H FILTER output

signal.

39 EXT B IN

40 EXT G IN

41 EXT R IN

42 CONTRAST

38

VEE

VCC1

39

40

41

VEE

VCC1

GND

External digital signal input.

There are two threshold

values: VTH1 (approximately

1.2 V) and VTH2 (approx-

imately 2.2 V). When one of

the RGB signals exceeds

VTH1, all of the RGB outputs

go to black level; when an

GND input exceeds VTH2, only the

corresponding output goes to

white level.

Adjusts RGB output contrast.

42

VEE

—8—

GND

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