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TMS320F28377S: ADC Reference buffer for 4 channels

DJ-NG
Genius 9240 points
Part Number: TMS320F28377S
Other Parts Discussed in Thread: REF3030, OPA320

Hi C2K champs!

Customer is developing PCB with F28377S and is looking for best fit for ref voltage (REF3030) buffer for 4 ADC modules.

They found OPA320 for REF3030 in  User’s Guide of LAUNCHXL-F28377S:

https://www.ti.com/lit/ug/sprui25d/sprui25d.pdf?ts=1596464967699&ref_url=https%253A%252F%252Fwww.google.com%252F

In e2e TI referenced to OPA320 in https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/521504?ADC-VREFHI-settings-for-F28377-with-ref3030

Question: Do we recommend a 4 channel OPA  for cost/PCB space reasons as voltage follower ?

  • 0
    TI__Guru 60865 points

    Hi DJ-NG,

    The only difference between 2 x 2 channel or 1 x 4 channel is going to be cost/area, so select the OPA320 part that makes the most sense from this perspective (probably the 1 x 4-channel); usually the Vos matching within a multi-channel package isn't really much better than between packages because each channel is trimmed independently.

    Also note that the TRM shows an example of using 1 OPA320 channel per 2 VREFHI inputs.  This is also acceptable, although the performance will be slightly lower.  In this case you'd probably us a single 2 channel OPA320.