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AMC7836: AMC7836 Application questions

Part Number: AMC7836
Other Parts Discussed in Thread: INA138

Hi team,

I have some questions about AMC7836.

1) when my customer tests ADC channels of AMC7836, they found that ADC 1~15 (Bipolar) can't correctly sample small voltage signal (<0.4V), But ADC 16 ~ 20 (Unipolar) can precisely sample signal even it's < 10mV. It looks like that ADC 1~15 is more sensitive to input impedance. Have you meet this issue before? How can customer solve this issue (Is it mandatory to add buffer before ADC input)? Below is customer's schematic.

2) Can all DAC channels of AMC7836 output 15mA at the same time in worst 125 degrees operating temp condition (thermal conditions for the device are not exceeded)?

thanks a lot.

Best regards,