ADS125H02： how to use

Hi Yamamoto-san,

Please refer to Equation 5 when trying to determine which signals can be passed into the ADS125H02. This is shown on Page 29 in the ADS125H02 datasheet.

Basically, VINN must be at least HVSS+2.5V. So if HVSS = 0V, then the minimum input signal you can apply to the ADC is 2.5V.

If you want to measure single-ended inputs using the ADS125H02, HVSS will have to be a maximum of -2.5. I would suggest something like HVSS = -5V just to give the supplies and your input signals lots of margin.

Regarding the input channels: if you apply your 10V signal to AIN0 and then ground AINCOM, you would select MUX[2:0] = 011b in the MODE4 register. But you could also apply the 10V signal to AIN1, or you could apply the ground signal to AIN1. The ADS125H02 provides a lot of flexibility, the only thing you cannot do is apply the 10V signal to AINCOM. You also need to make sure that AINCOM is actually tied to ground, the ADC does not have an internal method to connect the analog input pins to ground.

-Bryan

Hi Brian-san

Thank you for your polite answer.
I used it incorrectly.
Is there any problem if the usage is as follows?
HVDD = + 15V, HVSS = -15V, AIN0 / 1 = 0-10V, AINCOM = GND
Connect to and set MUX [2..0] = 011b and GAIN [3..0] = 0010b.

-yamamoto