W6662CF 데이터 시트보기 (PDF) - Winbond

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W6662CF

SCANNER ANALOG FRONT END

Winbond 

Preliminary W6662CF

If input capacitor value is specified as CIN, the following is the equation to calculate how many lines

are required before the capacitor settles to the desired accuracy after power is up:

LN =

(RON + RCCDS) × CIN

PIXN × tCLP

ln (VOFS/VCLPTolerance )

where

LN is line number.

PIXN is the total pixel number in one line.

CIN is the input capacitor value, 0.01 µF is suggestion value.

VOFS is the internal offset voltage to be clampped on the input terminal of the input capacitor.

CCD Device

RCCDS

CIN

IBIAS

W6662

Input to MUX

0.01uF

RON = 5K

on when

CDSCK1= high

VOFS

Fig. 6-1 Equivalent Circuit of Clampping.

Output

signal

from CCD

(Pixel n) VC

VDATAn

VOFS

Input

signal

to W6662

VC

VDATAn

(Pixel n+1)

VDATAn+1

tCLP

VCLPTolerance

VDATAn+1

Fig. 6-2 CCD Input Clamp Waveform.

6.2 MUX and Channel Select

The analog input signal may be three channels or single channel and is specified in configuration

register. Three channel input or single channel input are described as follows:

The three channel input is used for red, green and blue analog signal input, selected by SEL1 and

SEL0 signals. The channel select signals SEL1 and SEL0 may be 01, 10, 11 and listed as follows:

SEL1 = 0, SEL0 = 1 is red channel input selected, red channel of gain register and offset register also

selected.

SEL1 = 1, SEL0 = 0 is green channel input selected, green channel of gain register and offset register

also selected.

SEL1 = 1, SEL0 = 1 is blue channel input selected, blue channel of gain register and offset register

also selected.

SEL1 = 0, SEL0 = 0 is reserved.

The one channel input is used for black and white CCD/CIS sensor or multiplexed color CCD/CIS

sensor output. Any channel input of red, green or blue can be used, other un-used analog input must

tight to VSS in S & H mode. The channel select signals SEL1 and SEL0 is used to select offset

register and gain register only and may be 01, 10, 11, described as follows:

Publication Release Date: December 1998

-5-

Revision A1

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