ADS131E08: Vcm ADS131

Alberto S. G.

Part Number: ADS131E08

Tool/software:

According with thin scrrenshot, if INxN=0 INxP min should be betwen AVDD-0,3-INxPmax/2 and AVSS+0.3+INxPmax/2 So I can't use the most of the range beacuse in low signals my Vcm is close tu 0, isn't it? I would like to have a 0-4V INxP signal.

6 months ago

0 Dale Li 6 months ago

TI__Mastermind 45955 points

Hi Alberto S. G.,

Your understanding is correct. Can you let me know what your signal is (INxP and INxN)?

BR,

Dale

0 Alberto S. G. 6 months ago in reply to Dale Li

Prodigy 100 points

AVDD 5v
AVSS 0v
VMAX_DIFF 4.01v
INxN 0v
INxP 0 - 4.01 v

2.695 > Vcm > 2.305 v
INxN=0v --> 5.39 > INxP > 4.61 v

5.39>AVDD --> 5 > INxP > 4.61 v

If I'm not wrong, i get the optimal point with INxN to 2.5V where
VMAX_DIFF 2.005 INxN 2.5v INxP 0.495v - 4.505v

3.6975>Vcm>1.3025 --> 4.9 > INxP > 0.105

0 Dale Li 6 months ago in reply to Alberto S. G.

TI__Mastermind 45955 points

Hi Alberto S. G.,

When using ADS131E08, you can not short INxN to the ground, that will definitely violate the common-mode voltage requirement, ADS131E08 does not support single-ended input. You have to use pseudo-differential input configuration.

Best,

Dale

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ADS131E08: Vcm ADS131