CXA1810 データシートの表示（PDF） - Sony Semiconductor

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CXA1810

Luminance and Color Signal Processing for 8mm VCR

Sony Semiconductor 

CXA1810AQ/AR

Pin

Symbol

No.

Pin voltage

DC

AC

26 DDS/MASK 2.0V

—

(when open)

(MASK)

1.5V

(DDS)

2.3 to 3.0V

Equivalent circuit

Description

150

26

Input for VOW (character

level) signal, VOB (character

background) timing pulse of

DDS (date display system)

2.0V and masking timing pulse.

MASK : VTH = 1.1V

DDS : VTH = 2.0V

1.1V

By varying the input DC for

DDS over a range of 2.3V to

45k 16k

15k

3.0V, the character level can

be changed.

(Refer to item 4 on Description

of Operation.)

27 WDC

2.6V

—

(when open)

28 V IN2

2.05V

(sync tip

level)

Video

500mVp-p

input

29 AGC TC1

—

—

Determines the white/dark

4.1V clipping levels. During open,

30k

150

27

the standard white clipping

level is 235%, and the dark

10k

2.05V

clipping level is 95%.

(Mode DC1, 2 = Low, High)

(Refer to item 5 on Description

of Operation.)

Video signal input. Performs

270

diode clamping, with the

clamp capacitance externally

28

connected. If the mode MUTE

is set High, the charge of the

100nA 4µA

clamp capacitance is

MUTE discharged.

ON

100

29

1k

47k

Time constant for the video

AGC circuit in the I/O block.

During mute and playback, the

charge of the external

capacitance is discharged.

MUTE ON

PB ON

—9—

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