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The settling time of switching from CDS mode to SHA mode.

Question asked by ysuzuki on Oct 2, 2014
Latest reply on Oct 8, 2014 by EBarnes

Hello,

 

My friend is trying to use AD9982 with CIS.

He has a question about the settling time of switching from CDS mode to SHA mode.

When using CIS he connects the vref level of CIS module to the OFFSET pin.

In default condition (CDS mode), The OFFSET pin outputs internal clamp level.

He wants to avoid a colliding between internal clamp level and CIS vref level.

For this reason, he inserted analog switch at CIS vref line to avoid this colliding

and he observed the settling from CDS mode to SHA mode via the output level of OFFSET pin.

But the settling times were changed with temperature.

 

How long should he wait the connecting of the CIS vref to OFFSET pin ?

 

Thnak you,

ysuzuki

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