PSoC4 : Current Digital to Analog Converter specification

[MiNe_85951]

Dear Sirs and Madams,

Please tell us because there are specifications that We don't understand about IDAC of PSoC4.

Below is an excerpt from the IDAC component data sheet.

Please tell us about the specifications of this "IDACMISMATCH".

(a)

Does this "IDACMISMATCH" spec mean that even if the same value is set for IDAC1 and IDAC2, different currents will be output for the number of bits above?

(b)

If so, why is MISMATCH so large even though DNL and INL are at most 2 bits?

Regards,

[SampathS_11 · Accepted solution]

Hello @MiNe_85951 ,

(a)

Does this "IDACMISMATCH" spec mean that even if the same value is set for IDAC1 and IDAC2, different currents will be output for the number of bits above?

Ans: Yes, you are correct, and the IDACMISMATCH spec quantifies the variation you may find between the two IDACs for the same code.

(b)

If so, why is MISMATCH so large even though DNL and INL are at most 2 bits?

IDACMISMATCH is large due to the gain error in the two IDACs. The gain error will not be the same for both the IDACs.

Best regards,

Sampath Selvaraj

[MiNe_85951]

Sampath-san,

We understand it in your detailed explanation.

Thank you,