The AMC1351 provides a differential analog output on the OUTP and OUTN pins. For input voltages (V_IN) in the range from –0.25 V to 5 V, the device provides a linear response with a nominal gain of 0.4 V/V. For example, for an input voltage of 5 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 6.9 table. For input voltages greater than 5 V but less than approximately 6.25 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.

The AMC1351 output offers a fail-safe feature that simplifies diagnostics on a system level. Figure 7-2 shows the behavior in fail-safe mode, in which the AMC1351 outputs a negative differential output voltage that does not occur under normal operating conditions. The fail-safe output is active:

• When the high-side supply VDD1 of the AMC1351 device is missing
• When the high-side supply VDD1 falls below the undervoltage threshold VDD1_UV

Use the maximum V_Fail-safe voltage specified in the Section 6.9 table as a reference value for fail-safe detection on a system level.