CXD2073S Просмотр технического описания (PDF) - Sony Semiconductor

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CXD2073S

Digital Comb Filter (NTSC)

Sony Semiconductor 

CXD2073S

Clamp

Item

Clamp level∗1

∗1 Sync tip clamp

Symbol

CLV

Conditions

(VDD = 5V, Ta = 25°C, f = 10MHz)

Min.

Typ.

Max. Unit

—

0.67

—

V

Description of Functions

• Horizontal aperture compensation

Compensates aperture degradation accompanied by D/A conversion.

This compensation is effective for the following modes; adaptive processing, Y through, and simple comb

modes.

• Switching of Y/C separation modes

The following four modes can be set; however, the adaptive processing mode or Y through mode is normally

used.

(1) Adaptive processing mode

This mode detects interline correlation, switches between comb filter processing and BPF processing,

and operates Y/C separation.

(2) Y through mode

The composite video signal input from ADIN (Pin 5) is A/D converted. It is also D/A converted, and then

output from AYO (Pin 10).

At this time, the output of ACO (Pin 8) is the same output as that of adaptive processing mode.

(3) BPF mode

C signal is generated by passing composite video signal through BPF.

Y output is a signal in which the C signal generated is subtracted from input composite video signal.

(4) Simple comb mode

Y/C separation is operated by the comb filter processing forcibly.

Modes

Adaptive processing mode

Y through mode

BPF mode

Simple comb mode

MOD1 (Pin 18)

L

L

H

H

MOD2 (Pin 17)

L

H

L

H

• Selection Pin Setting Table

Pin No.

3

17

18

19

28

Symbol

CLPEN

MOD2

MOD1

APCN

CKSL

H

Internal clamp not used

L

Internal clamp used

See the table above.

Horizontal aperture compensation ON Horizontal aperture compensation OFF

Internal 4-multiple PLL used

Internal 4-multiple PLL not used

–5–

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