WM8232 datasheet(18/141 Pages) CIRRUS

18 / 141 page

WM8232

Rev 4.6

CONTROL

INTERFACE

CIN

IN*

VRLC/

VBIAS

VRLCEN

5-BIT

RLCDAC

VRLC_VSEL[4:0]

RLC switch

VSMP

'Video'

sample

capacitor

'Reference'

sample

capacitor

VSMP

CLAMP

VSMP (if CDS=0)

RSMP (if CDS=1)

VSMP (if CDS=0)

Figure 10 RLC Clamp Control Options

In CDS operation, when an input waveform has a stable reference level on every pixel, it may be

desirable to clamp every pixel during this period. Setting CLAMP=high means that the RLC switch is

closed whenever the RSMP is high, as shown in Figure 11.

In non-CDS operation, setting CLAMP=high means that the RLC switch is closed whenever the VSMP

is high, as shown in Figure 12.

VSMP

RSMP

RLC switch control

"CLAMP"

RLC switch closed

when RSMP=1

Video sample taken on

fallling edge of VSMP

Reset/reference sample taken

on fallling edge of RSMP

INPUT VIDEO

SIGNAL

reference

("black") level

video level

CLAMP

Pixel counter

Figure 11 Reset Level Clamp Operation, CDS Operation Shown

VSMP

RLC switch control

"CLAMP"

RLC switch closed

when VSMP=1

Video sample taken on

fallling edge of VSMP

INPUT VIDEO

SIGNAL

CLAMP

Pixel counter

video level

Figure 12 Line Clamp Operation, non-CDS operation shown

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