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7.3.3 Analog Output

The AMC3302-Q1 offers a differential analog output comprised of the OUTP and OUTN pins. For differential

input voltages (VINP – VINN) in the range from –50 mV to 50 mV, the device provides a linear response with a

nominal gain of 41. For example, for a differential input voltage of 50 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

50 mV but less than 64 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 7-2, if

the differential input voltage exceeds the VClipping value.

Linear input range (VFSR)

Maximum input range before clipping (VClipping)

64 mV

50 mV

VOUTP

VOUTN

Differential Input Voltage (VINP ± VINN)

VCMout

VCLIPout

VFAILSAFE

Figure 7-2. Output Behavior of the AMC3302-Q1

The AMC3302-Q1 provides a failsafe output that simplifies diagnostics on system level. Figure 7-2 shows the

failsafe mode, in which the AMC3302-Q1 outputs a negative differential output voltage that does not occur under

normal operating conditions. The failsafe 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

failsafe detection on the system level.

7.3.4 Isolated DC/DC Converter

The AMC3302-Q1 offers a fully integrated isolated DC/DC converter that includes following components

illustrated in the Functional Block Diagram:

• Low-dropout regulator (LDO) on the low-side side to stabilize the supply voltage VDD that drives the low-side

of the converter. This circuit does not output a constant voltage and is not intended for driving any external

load.

• Low-side full-bridge inverter and drivers.

• Laminate-based, air-core transformer for high immunity to magnetic fields.

• High-side full-bridge rectifier.

• High-side LDO to stabilize the output voltage of the DC/DC converter for high analog performance of the

signal path.

The DC/DC converter uses a spread-spectrum clock generation technique to reduce the spectral density of

the electromagnetic radiation. The resonator frequency is synchronized to the operation of the ΔΣ modulator to

minimize the interference with data transmission and support the high analog performance of the device.

The architecture of the DC/DC converter is optimized to drive the high-side circuitry of the AMC3302-Q1 and can

source up to IH of additional DC current for an optional auxiliary circuit such as an active filter, preamplifier, or

comparator. IH is specified in the Electrical Characteristics table as a DC, non-switching current.

AMC3302-Q1

SBASA84A – FEBRUARY 2021 – REVISED JULY 2021

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