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ADS1120: Pseudo-Differential input

Yusuke Mukuno
Expert 7395 points
Part Number: ADS1120
Other Parts Discussed in Thread: ADS131E04, ADS114S06

Hi expert,

My customer is using the AFE that is Pseudo-Differential output as input signal,

In generally, Can they use  the General Purpose differential input  ADCs? or should they use ADC taht is supporting pseudo-Differential input?

I'm proposing the following devices, if you have recommended device, please let me know,

ADS1120

ADS131E04

ADS114S06

Requirements,

・Ch# : >2ch 

・differential input (Pseudo-Differential input)

・ >16bit

・Vcc：3V

・PGA : from 1 to 8

・Small size

・> 1kSPS

Thanks

Mukuno

  • 0
    TI__Guru** 113765 points

    Hi Mukuno,

    All three devices are capable of pseudo-differential measurements.  The ADS131E04 is a rather large package (TQFP-64) but has simultaneous converters whereas the other two devices use a muxed input and a single ADC.  Depending on the gain applied there may be some input restrictions and for devices that have a true PGA, you cannot measure an input signal all the way to AGND unless the PGA is bypassed (ADS1120, ADS114S06).  With the PGA bypassed the ADS1120 can have a gain up to 4, and the ADS114S06 can only have a gain of 1.  The smallest device package will be the ADS1120 followed by the ADS114S06.

    Best regards,

    Bob B