AMC1350 datasheet(13/28 Pages) TI

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7.3.3 Analog Output

The AMC1350 offers a differential analog output on the OUTP and OUTN pins. For differential input voltages

(VINP – VINN) in the range from –5 V to +5 V, the device provides a linear response with a nominal gain of 0.4

V/V. For example, for a differential input voltage of 5 V, the differential output voltage (VOUTP – VOUTN) is 2 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 5 V but less than 5.75 V,

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 7-2, if the differential input voltage

exceeds the VClipping value.

Linear input range (VFSR)

Maximum input range before clipping (VClipping)

6.25 V

5 V

VOUTP

VOUTN

Differential Input Voltage (VINP – VINN)

VCMout

VCLIPout

VFAILSAFE

Figure 7-2. Output Behavior of the AMC1350

The AMC1350 offers a fail-safe feature that simplifies diagnostics on system level. Figure 7-2 shows the fail-safe

mode, in which the AMC1350 outputs 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

The AMC1350 output offers a fail-safe feature that simplifies diagnostics on a system level. Figure 7-2 shows the

fail-safe condition, in which the AMC1350 outputs 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 VDD1 of the AMC1350 device is missing

• When the high-side supply VDD1 falls below the undervoltage threshold VDD1UV

Use the maximum VFAILSAFE 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 AMC1350 is operational when the power supplies VDD1 and VDD2 are applied as specified in the

Recommended Operating Conditions table.

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AMC1350

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