6.3.3 Analog Output

The AMC3301 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 6-2 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 6-2. Output Behavior of the AMC3301

The AMC3301 provides a fail-safe output that simplifies diagnostics on system level. Figure 6-2 shows the

fail-safe mode, in which the AMC3301 outputs a negative differential output voltage that does not occur under

normal operating conditions. The fail-safe output is active in two cases:

• The low-side does not receive data from the high-side (for example, because of a loss of power on the high

side).

• The high-side DC/DC output voltage (DCDC_OUT) or the high-side LDO output voltage (HLDO_OUT) drop

below their respective undervoltage detection thresholds (brown-out).

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

fail-safe detection on the system level.

AMC3301

SBAS917C – AUGUST 2019 – REVISED MAY 2025

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