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ADS7138-Q1: [ADS7138-Q1] Analog input level related inquiry

MJ Jeon
Genius 5240 points
Part Number: ADS7138-Q1

Hi, TI Support Team

The following inquiries have been received from customers.

[condition]

AVDD: 3.3V

Ainx: max. 3.3V

The product is being used under the above conditions, but the spec written in the datasheet is confirmed as the maximum value.

1. Is there any possibility of defects when using the product under the above conditions?

2. What is the difference between the FSR part and the Vin part described in the datasheet?

3. When applying the actual product, should the value of Ainx not exceed 3.3V as described in FSR? What problems do you encounter? (eg clipping)

Thanks.

Regards,

MJ

  • 0
    TI__Guru 63905 points

    Hello,

    1.) You are looking at the "Recommended Operating Conditions" these are the conditions where it is safe and recommended to use the product.

    2.) The full-scale range is equal to the reference voltage, which is equal to the AVDD supply in this device.  This is the voltage range that procudes the minimum through maximum output codes.  Therefore the difference between AINx-GND must be between 0-AVDD or the conversion result will saturate.  

    The absolute input range specifies that the individual inputs can go +/-100mV above/below the supplies without causing issues or damage, but the full-scale voltage is still limited to within the supplies.