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Part Number: ADS1263
At present, ADS1263 is selected. Some questions need to be consulted: 1. Does the chip have to support differential? 2. What is the role of the third pin AINCOM, how to use it? 3. Is there a crystal oscillator of the 15th and 16th crystal oscillator pins that can only be connected to the MCU? If it can be connected to an external crystal oscillator, what's the difference between using crystal oscillator of MCU?Our demand is: the analog acquisition voltage value is our power supply voltage, which is initially determined to be 5V, 3.3V, 1.3V, multi-channel acquisition, 32-bit high precision, because MCU resources are limited, so try to occupy as little as possible The resources of the MCU.
Can the chip meet the requirements?
I'd be glad to help answer your questions regarding the ADS1263...
Regarding your comment about the ADS1263's ability to measure different power supply voltages... I think you can measure all of these supplies, but you'll probably have to BYPASS the PGA. You definitely cannot ground any of the analog inputs while the PGA is enabled, and connecting any input pin to 5V while the PGA is enabled will also be a problem.
Another thing to consider is will the ADS1263 ever be OFF while connected to these supply voltages? If so, you'll need to limit the input current (with a series resistor) to make sure the input current never exceeds 10 mA, otherwise you may damage the device.
The combination of bypassing the PGA and adding a series resistance is not ideal, but if you keep the series resistance low (between 500 Ohms and 2k), you'll probably get okay performance. Also keep in mind that the supply noise will be observable in the ADC's conversion result, so unless you have a very clean supply you may not benefit much from the ADS1263's 32-bit resolution; you might be fine with a 24- or 16-bit ADC.
Best regards,Chris HallApplications Engineer | Precision ADCs
Check out these helpful resources...TI Precision Data Converters | TI Precision Labs - ADCs | Analog Engineer's Calculator | Data Converters Learning Center | Selection Guide
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