Linear operation of the PGA requires that the absolute input voltage does not exceed the specified range. The following example shows how to verify the absolute input voltage is within the valid range. In this example, the input signal is ±10 V using a chosen 15% overrange capability. The negative input lead of the sensor is connected to AGND and AINN. The ADC gain is chosen at 0.1875 using a 2.5-V reference voltage and ±15-V power supplies with a 5% voltage tolerance. The summary of conditions to verify PGA operating conformance are:

• V_{(AINP_MAX)} = 10 V × 115% = 11.5 V
• V_{(AINP_MIN)} = –10 V × 115% = –11.5 V
• V_(AINN) = AGND
• HV_AVDD_MIN = 15 V × 95% = 14.25 V
• HV_AVSS_MAX = –15 V × 95% = –14.25 V
• Gain = 0.1875
• V_REF = 2.5 V

The evaluation of Equation 3 (for gain < 1) results in:

–11.75 V < –11.5 V and 11.5 V < 11.75 V

The inequality is satisfied, and as a result, the absolute input voltage is within the PGA input range.