7.3.3 Analog Output

The AMC1351 provides a differential analog output on the OUTP and OUTN pins. For input voltages (VIN) 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 (VOUTP – VOUTN) is 2 V. At zero input (IN shorted to GND1),

both pins output the same common-mode output voltage VCMout, as specified in the Electrical Characteristics

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 VCLIPout, as shown in Figure 7-2, if the input voltage exceeds the VClipping value.

Input Voltage (VIN)

Linear input range (VFSR)

Maximum input range before clipping (VClipping)

0

6.25 V

5 V

VOUTP

VOUTN

VCMout

VFail-safe

VCLIPout

Figure 7-2. Output Behavior of the AMC1351

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 VDD1UV

Use the maximum VFail-safe voltage specified in the Electrical Characteristics table as a reference value for

fail-safe detection on a system level.

7.4 Device Functional Modes

The AMC1351 is operational when the power supplies VDD1 and VDD2 are applied as specified in the

Recommended Operating Conditions table.

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AMC1351

SBASAA8 – DECEMBER 2021

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