The complicated circuit for 28377D ADCREFHI 16bit mode

ccen3020

Other Parts Discussed in Thread: CONTROLSUITE, ADS8881

Now I'm design a broad for 28377D, and I found a circuit for 16bit ADCREFHI in ControlSUITE 3.3.1, it looks very complicate.

Is it necessary? Why?

If I want to replace some component, how to select the amplifier?

over 9 years ago

0 Devin Cottier over 9 years ago

TI__Guru 60865 points

Hi ccen3020,

You can get some idea of the design procedure in the ADS8881 datasheet (http://www.ti.com/lit/gpn/ads8881

0 Devin Cottier over 9 years ago in reply to Devin Cottier

TI__Guru 60865 points

This circuit was used to characterize the ADC, so we know it will give good performance in 16-bit mode.

We are working on characterizing alternate VREFHI generation circuits, but I don't have a schedule for when these recommendations will be available.

0 ccen3020 over 9 years ago in reply to Devin Cottier

Prodigy 90 points

Thanks for advice.

If choose 2.5V or 3V as VREF, can I use 3.3V to supply amplifers and reference?

0 Devin Cottier over 9 years ago in reply to ccen3020

TI__Guru 60865 points

Yeah, that should work. If you use the device 3.3V rail for your amplifiers, then this will also guarantee power cycling of the VDDA and VREF (VDDA needs to be >= VREFHI at all times).

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The complicated circuit for 28377D ADCREFHI 16bit mode