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Part Number: INA129
Customer's circuit is as bellow and they care the CMRR most.
The test input is VCM=10V@10Hz, VDIFF=100uV@10Hz.
While input from INS+ and INS-, CMRR>119dB; but from IN+ and IN-, CMRR<80dB.
Customer's requirement is how to make CMRR>110dB while input from IN+ & IN-.
Thank you and happy new year!
Precision Amplifier Applications - TI Tucson
In reply to Alexander Davis:
Customer use IN- to drive 16 INS-, the U119 is for the drive ability.
I will recommend customer to add a similar buffer to the INS+ input to see the result.
Thank you and best regards,
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