XRD9825ACD 데이터 시트보기 (PDF) - Exar Corporation

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XRD9825ACD

16-Bit Linear CIS/CCD Sensor Signal Processor with Serial Control

Exar Corporation 

XRD9825

XRD9825

C RED

I

M

S

N/C

N/C

U

N/C

X

VDD

VRT

RL

VRB

Figure 3. Application with Offset in the Range (-100mv to 500mv)

The input is added to VRB before the signal passes

through the ADC. If the CIS output is zero, then the

output of the ADC will be zero code. This enables the

CIS to be referenced to the bottom ladder reference

voltage to use the full range of the ADC.

Some CIS sensors have an output with an offset voltage

of greater than 500mV. If the CIS output is beyond the

offset range of the XRD9825 (see Offset Control DAC,

Pg. 22) set the internal mode registers to external

reference. An external reference voltage equal to the

value of the CIS offset voltage can be applied to

VDCEXT (Figure 4) in order to meet the dynamic range

of the XRD9825. Figure 4, is a diagram of the XRD9825

in the external reference mode for CIS, DC coupled

applications.

Rev. 1.00

9

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