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ADS8509: Input circuit of ADS8509

Part Number: ADS8509
Other Parts Discussed in Thread: ADS8685, ADS8681

Dear Technical Support Team,

The offset value of ADS8509 and its variation are large, and we are investigating the cause.
The specifications listed in the data sheet are for 0.1% external resistance. In the actual circuit, a resistor with 1% accuracy is used, and it is unknown how much the variation of the resistor affects the AD conversion value.
Please tell me the detailed input circuit of ADS8509 for this investigation.
I use the same circuit as 0V-4V Without Trim in Figure 29.

Best Regards,

ttd