MAX22005 Input Range

Hi James4832,

As the chip has fixed input range, you'll need an external difference amplifier with gain of 2 in front of the input. Apply +5V precision reference voltage to the negative input (V1). that will shift 0..+10V to -10..+10V. You could also utilize the chip's internal 2.5V reference, in which case you'll need to attenuate the input signal to half and have x4 gain for the difference amp. In that configuration be aware that the reference branch (V1) of the amplifier dynamically loads the internal reference output, possibly degrading the performance of the ADC.

https://www.analog.com/media/en/training-seminars/tutorials/MT-068.pdf

Cheers, heke, AsamaLab

Hi James4832,

As the chip has fixed input range, you'll need an external difference amplifier with gain of 2 in front of the input. Apply +5V precision reference voltage to the negative input (V1). that will shift 0..+10V to -10..+10V. You could also utilize the chip's internal 2.5V reference, in which case you'll need to attenuate the input signal to half and have x4 gain for the difference amp. In that configuration be aware that the reference branch (V1) of the amplifier dynamically loads the internal reference output, possibly degrading the performance of the ADC.

https://www.analog.com/media/en/training-seminars/tutorials/MT-068.pdf

Cheers, heke, AsamaLab