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TMS570LC4357: Accurate Reference solution

Needhu Gunasegaran
Intellectual 2710 points
Part Number: TMS570LC4357
Other Parts Discussed in Thread: REF6033, TPS65381A-Q1

Hi Team,

Could you please answer the question from my customer.

I’m searching for a very accurate ADC-Reference for our TMS570 Project.

From the TMS Datasheet (http://www.ti.com/lit/ds/symlink/tms570lc4357.pdf) I have the following Information.

For best accuracy we should take a 3.3V Reference

The Reference need to provide up to 10 mA

Question: are this 10mA temperature depended? I suppose to see the max current Value if ADC channel (n+1) = 0V if ADC channel(n)  Vref. Is this right?

With the information from Martin (/cfs-file/__key/communityserver-discussions-components-files/908/1817.switching_5F00_transients3.png)

Page: http://e2e.ti.com/blogs_/archives/b/precisionhub/archive/2016/09/16/why-is-it-so-challenging-to-design-a-voltage-reference-circuit-for-an-adc)

The 10mA needs only to supplied for very short transients.

If I take a Reference like REF6033 (http://www.ti.com/lit/ds/symlink/ref6033.pdf) I think the reference is not able to provide the necessary current.
Could you provide us a recommend components / schematic for a accurate Voltage Reverence to the TMS.

Thanks.

Needhu

  • 0
    TI__Guru 59540 points
    Hello Needhu,

    Unfortunately, I do not have any recommendations here. I can state, however, that the current consumption and total error are derived from characterization of devices across multiple process variables; min, max, and nominal voltages; and min, max, and nominal temperatures. In sort the specs encompass a wide process, voltage, and temperature variation. Generally speaking, the output of the recommended PMIC companion device, TPS65381A-Q1 has always proven sufficient for most of our customer's applications.