8.3.3 Analog Output

The AMC1300 offers a differential analog output comprised of the OUTP and OUTN pins. For differential input

voltages (VINP – VINN) in the range from –250 mV to +250 mV, the device provides a linear response with a

nominal gain of 8.2. For example, for a differential input voltage of 250 mV, the differential output voltage (VOUTP

– VOUTN) is 2.05 V. At zero input (INP shorted to INN), both pins output the same common-mode output voltage

VCMout, as specified in the Electrical Characteristics table. For absolute differential input voltages greater than

250 mV but less than 320 mV, the differential output voltage continues to increase in magnitude but with reduced

linearity performance. The outputs saturate at a differential output voltage of VCLIPout, as shown in Figure 8-2, if

the differential input voltage exceeds the VClipping value.

Linear input range (VFSR)

Maximum input range before clipping (VClipping)

320 mV

320 mV

250 mV

250 mV

0

VOUTP

VOUTN

Differential Input Voltage (VINP – VINN)

VCMout

VCLIPout

VFAILSAFE

Figure 8-2. Output Behavior of the AMC1300

The AMC1300 offers a fail-safe feature that simplifies diagnostics on system level. Figure 8-2 shows the fail-safe

potential that is a negative differential output voltage that does not occur under normal operating conditions. The

fail-safe output is active in two cases:

• When the high-side supply is missing or below the VDD1UV threshold

• When the common-mode input voltage, that is VCM = (VINP + VINN) / 2, exceeds the common-mode

overvoltage detection level VCMov

Use the maximum VFAILSAFE voltage specified in the Electrical Characteristics table as a reference value for

fail-safe detection on system level.

8.4 Device Functional Modes

The AMC1300 is operational when the power supplies VDD1 and VDD2 are applied, as specified in the

Recommended Operating Conditions table.

AMC1300

SBAS895D – MAY 2018 – REVISED MAY 2022

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