The AMC3311 provides a differential analog output on the OUTP and OUTN pins. For input voltages 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 HGND), both pins output the same common-mode output voltage V_CMout, as specified in the Electrical CharacteristicsElectrical CharacteristicsElectrical Characteristics 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 7-2, if the input voltage exceeds the V_Clipping value.

Figure 7-2 Output Behavior of the AMC3311

The AMC3311 provides a fail-safe output that simplifies diagnostics on a system level. The fail-safe output is active when the integrated DC/DC converter or high-side LDO do not deliver the required supply voltage for the high-side of the device. Figure 7-3 and Figure 7-4 show the fail-safe output of the AMC3311, which is a negative differential output voltage value that does not occur under normal operating conditions. Use the maximum V_FAILSAFE voltage specified in the Electrical CharacteristicsElectrical CharacteristicsElectrical Characteristics table as a reference value for the fail-safe detection on a system level.

Figure 7-3 Typical Negative Clipping Output of the AMC3311

Figure 7-4 Typical Fail-Safe Output of the AMC3311