Kinetis Microcontrollers中的主题 Re: K32L2A DAC current direction

K32L2A DAC current direction

jh0 — Fri, 22 Oct 2021 09:21:48 GMT

Hi,

I see in device datasheet section 8.6.4.1 12-bit DAC operating requirements that DAC output load current (IL) max is 1mA. This is OK for me, just want to check if output amplifier can both sink and source current.

Re: K32L2A DAC current direction

FelipeGarcia — Mon, 25 Oct 2021 22:50:53 GMT

Hi,

The DAC output can only source current through its output amplifier. It is not a logic output that can sink current.

Have a great day,

Felipe

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Re: K32L2A DAC current direction

jh0 — Tue, 26 Oct 2021 06:29:46 GMT

Hi,

Maybe this will be more clear...

K32L2 DAC can be used for controlling LDO output voltage level or not?

https://e2e.ti.com/blogs_/archives/b/precisionhub/posts/give-your-voltage-regulator-the-margin-it-deserves

Re: K32L2A DAC current direction

bobpaddock — Tue, 26 Oct 2021 14:35:03 GMT

"... Be careful not to choose an unbuffered DAC. The output amplifier needs to both sink and source current. ..."

From their answers about not sinking current then it is not usable without an OpAmp follower.

Re: K32L2A DAC current direction

jh0 — Tue, 26 Oct 2021 19:16:07 GMT

Hi Bob,

There is internal buffer / amp at K32L2A DAC output pin so I think that should work. Just want to be 100% sure.