when it is used single-ended input , input voltage range (0.37 gain)

Hello, 

As stated in the Voltage Reference Input section (Page 30) of the datasheet, the ADAQ23876 offers three voltage reference options: 

1. Internal 2.048V reference with Internal Reference Buffer (G =2)
2. External 2.048V Reference with Internal Reference Buffer (G =2)
3. External 4.096V Reference with External Reference Buffer (Internal Reference Buffer Overdriven)

When using an internal or external 2.048V reference, an internal buffer gains (G=2, see Figure 1) this reference voltage by 2× to 4.096V at the REFBUF pin, so in any case, the voltage difference between REFBUF and GND determines the full-scale input range (i.e. +/-4.096 V) of ADC inside the ADAQ23876, so the typical ±10 V (SE or differential) input range for G =0.37 and for all other gain/input range configurations presented in Table 8 as well as the Applications diagrams (Figure 71-80) in the datasheet are correct.

Hope that helps!

It would be great If you can share any detail about your end application use case.

Thanks,
Maithil

Hello, 

As stated in the Voltage Reference Input section (Page 30) of the datasheet, the ADAQ23876 offers three voltage reference options: 

1. Internal 2.048V reference with Internal Reference Buffer (G =2)
2. External 2.048V Reference with Internal Reference Buffer (G =2)
3. External 4.096V Reference with External Reference Buffer (Internal Reference Buffer Overdriven)

When using an internal or external 2.048V reference, an internal buffer gains (G=2, see Figure 1) this reference voltage by 2× to 4.096V at the REFBUF pin, so in any case, the voltage difference between REFBUF and GND determines the full-scale input range (i.e. +/-4.096 V) of ADC inside the ADAQ23876, so the typical ±10 V (SE or differential) input range for G =0.37 and for all other gain/input range configurations presented in Table 8 as well as the Applications diagrams (Figure 71-80) in the datasheet are correct.

Hope that helps!

It would be great If you can share any detail about your end application use case.

Thanks,
Maithil

You were right.
My measurement environment has 2x the level of the signal generator, so I was mistaken.
Thanks for the confirmation.