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TINA/Spice/PGA281: Gain Control is not as per the datasheet in simulation

Rajesh Kaliyaperumal
Intellectual 930 points
Part Number: PGA281
Other Parts Discussed in Thread: TINA-TI,

Tool/software: TINA-TI or Spice Models

Hi ,

I am trying to simulate the PGA281 in LTspice. Gain Adjustment simulation of the PGA281 is not as per datasheet recommendation (shown in the below table ).

The problem is when G3:G0 bits set for a particular gain, the actual Gain from the output is previous immediate gain in the below table, like wise row number 2 to 10 in table misbehaves.

For example, if G3:G0 bits set for unity Gain, The actual output Gain from the output is 0.5 .

Also G3:G0 setting 0000,1010 and greater are not working correctly for set gain.

I have also tried in Tina Ti tool the same behavior exists.

Could you check it and send us the corrected Spice model ?

Thanks & Regards,

Rajesh