MSPM0G3507: DAC + OPAMP(Inverting) doesn't work

Ryan KIM

Part Number: MSPM0G3507

Tool/software:

Hello all,

I'd like to amplify DAC output with OPAMP.

I wanna make 2 pulse.

1. Non inverted - work well

2. Inverted - X. No output pulse.

Could you the problem?

What should I have to change to fix it?

Thank you!

0 Pengfei Xie 2 months ago

Hi Ryan,

For the invert input of OPA from DAC, I think you could refer to this SDK example:opa_inverting_pga_with_dac

0 Ryan KIM 2 months ago in reply to Pengfei Xie

Hi Pengfei,

Thank you for your answer.

I also referred that example. But it doesn't work(doesn't amplified).

Also, I can't make sense the example's PSEL, NSEL, MSEL connection in non-inverted example.

Could you please check it one more?

Thank you

0 Pengfei Xie 2 months ago in reply to Ryan KIM

Hi Ryan,

From your second configuration, it seems want to get a negative voltage output, and will be out of the 0-VCC range.

What is you purpose of second case, and what is your desired output corresponding to DAC output.

Best Regards,

Pengfei

Arm-based microcontrollers forum