AM2634: DACOUT calculation formula

Terry Deng

Part Number: AM2634

Tool/software:

would like to double confirm if the DACOUT calculation formula is correct or not in TRM CMPSS chapter. If it is correct, how to understand the meaning for parameter in the formula?

4 months ago

0 Ralph Jacobi 4 months ago

TI__Guru*** 135355 points

Hello Terry,

Apologies for the delay in replying here but can you clarify which parameter(s) you need clarification on?

Best Regards,

Ralph Jacobi

0 Terry Deng 4 months ago in reply to Ralph Jacobi

TI__Intellectual 2935 points

I would like confirm if below formulae is correct? what is the meaning for parameter 33 x 33 / 18

0 Fleenor 4 months ago in reply to Terry Deng

TI__Mastermind 22903 points

Hey Terry,

The internal analog design of the DAC feedback network sets the closed loop gain to 33/18, allowing utilization of the 1.8V DACREF to a full-scale 0V to 3.3V output for DACVALA codes of 0 to 4096.

However, there does seem to be an additional factor of 33 included in the TRM calculation.

I have filed a ticket to have this corrected to the following:

DACOUT = ((DACVALA*DACVREF)/4096) * 33/18

Best Regards,

Zackary Fleenor

+1 Fleenor 4 months ago in reply to Fleenor

TI__Mastermind 22903 points

Hey Terry,

I actually confirmed that this has already been updated in the source and should be reflected in the next TRM release.

Best Regards,

Zackary Fleenor

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AM2634: DACOUT calculation formula