AnsweredAssumed Answered

AD9642 Input Span

Question asked by DavidBleakley on Oct 6, 2016
Latest reply on Oct 17, 2016 by TonyM

Datasheet http://www.analog.com/media/en/technical-documentation/data-sheets/AD9642.pdf : 08/30/2016 shows:

Full-scale input voltage selection
01111 = 2.087 V p-p

00001 = 1.772 V p-p
00000 = 1.75 V p-p (default)
11111 = 1.727 V p-p

10000 = 1.383 V p-p

 

It also states input adjustment in 0.022 V steps.

If I start at the upper voltage and reduce in 0.022 steps, I get the following:

152.087
142.065
132.043
122.021
111.999
101.977
91.955
81.933
71.911
61.889
51.867
41.845
31.823
21.801
11.779
01.757
-11.735
-21.713
-31.691
-41.669
-51.647
-61.625
-71.603
-81.581
-91.559
-101.537
-111.515
-121.493
-131.471
-141.449
-151.427
-161.405

This does not match the datasheet. Should the step size be different, or is the upper or lower value incorrect?

Outcomes