AMC3301 datasheet(20/37 Pages) TI

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7.3.3 Analog Output

The AMC3301-Q1 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 in Section 6. 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 7-3 if the differential input voltage exceeds the VClipping value.

Linear input range (VFSR)

Maximum input range before clipping (VClipping)

320 mV

250 mV

VOUTP

VOUTN

Differential Input Voltage (VINP ± VINN)

Common mode output voltage

(VCMout)

Clipping output voltage

(VCLIPout)

Figure 7-3. AMC3301-Q1 Output Behavior

The AMC3301-Q1 provides a fail-safe output that simplifies diagnostics on system level. The fail-safe output is

active when the integrated DC/DC converter doesn't deliver the required supply voltage on the secondary side of

the device. Figure 7-4 and Figure 7-5 illustrate the fail-safe output of the AMC3301-Q1 that is a negative

differential output voltage value that does not occur under normal operating conditions. Use the maximum

VFAILSAFE voltage specified in the Electrical Characteristics table in Section 6 as a reference value for the fail-

safe detection on system level.

-2.492 V

VOUTN

VOUTP

Figure 7-4. Typical Negative Clipping Output of the AMC3301-Q1

AMC3301-Q1

SBASA73 – JULY 2020

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