CXA1700AQ Ver la hoja de datos (PDF) - Sony Semiconductor

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CXA1700AQ

Luminance and Color Signal Processing for 8mm VCR

Sony Semiconductor 

CXA1700AQ/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

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

150

26

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

—

—

27

28

29

4.1V

30k

150

10k

2.05V

270

100nA

4µA

MUTE

ON

Determines the white/dark

clipping levels. When open,

the standard white clipping

level is 235%, and the dark

clipping level is 95%.

(Mode DC1, 2 = Low, High)

(Refer to item 5 on Description

of Operation.)

Video signal input. Performs

diode clamping, with the

clamp capacitance externally

connected. If the mode MUTE

is set High, the charge of the

clamp capacitance is

discharged.

Time constant for the video

100

AGC circuit in the I/O block.

During mute and playback, the

charge of the external

1k

capacitance is discharged.

47k

MUTE ON

PB ON

—9—

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