The AMC1311 provides a differential analog output on the OUTP and OUTN pins. For input voltages of V_IN in the range from –0.1 V to +2 V, the device provides a linear response with a nominal gain of 1. For example, for an input voltage of 2 V, the differential output voltage (V_OUTP – V_OUTN) is 2 V. At zero input (IN shorted to GND1), both pins output the same common-mode output voltage V_CMout, as specified in the Section 7.9 table. For input voltages greater than 2 V but less than approximately 2.5 V, the differential output voltage continues to increase but with reduced linearity performance. The outputs saturate at a differential output voltage of V_CLIPout, as shown in Figure 8-2, if the input voltage exceeds the V_Clipping value.

The AMC1311 output offers a fail-safe feature that simplifies diagnostics on a system level. Figure 8-2 shows the fail-safe mode, in which the AMC1311 outputs a negative differential output voltage that does not occur under normal operating conditions. The fail-safe output is active in three cases:

• When the high-side supply VDD1 of the AMC1311 device is missing
• When the high-side supply VDD1 falls below the undervoltage threshold VDD1_UV
• When the SHTDN pin is pulled high

Use the maximum V_Fail-safe voltage specified in the Section 7.9 table as a reference value for fail-safe detection on a system level.