XRD9814B Datasheet, PDF(17/53 Page) Exar Corporation – 3-Channel 14/16-Bit Linear CCD/CIS Sensor Signal Processors

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XRD9814B Datasheet, PDF (17/53 Pages) Exar Corporation – 3-Channel 14/16-Bit Linear CCD/CIS Sensor Signal Processors

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XRD9814B/9816B

PGA

Gain

ï£«ï£ï£¬

Code

1024

ï£¶ï£¸ï£·

9.0

where Code represents the binary contents of the 10-

bit gain setting register.

Channel Offset Adjustment

The gross offset correction for each channel is

progammable from -400mV to +200mV. It is adjusted

by toggling PB9 and PB8 of Offset Registers (Table 4).

The fine offset correction for each channel is program-

mable from -300mV to +300mV.

Fine Channel Offset =

PB 7 â

ï£®

ï£°ï£¯

( Code ) ï£¹

128 ï£»ï£º

300mV

PB7=1 equals -1

PB7=0 equals +1

Code = (PB6:PB0) of the 10-bit offset register.

Differential

Input

Offset Block

CDS

10-Bit

PGA

8-Bit Offset DAC

Fine Adjust

XRD9814B/16B

Vout

2-Bit Offset

Variable Capacitive Divider

Gross Adjust

3:1

MUX

14-Bit

ADC

Block Diagram of the Fine and Gross Offset Adjustment DAC

Theory ofROepv.er1a.t0i0on

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