7.3.3 Analog Output

The AMC0x02R provides a single-ended analog output voltage proportional to the input voltage. The output is

referred to GND2 and is galvanically isolated from the input of the device. The output is designed to connect

directly to the input of an ADC.

The full-scale output voltage is set by the REFIN pin. For any input voltage within the specified linear input

range, the device outputs a voltage equal to:

VOUT = VIN / VClipping x VREFIN / 2 + VREFIN / 2 = (VINP – VINN) / VClipping x VREFIN / 2 + VREFIN / 2

(1)

Connect REFIN to the same reference voltage as a downstream ADC to match the ADC dynamic input voltage

range. With a shared reference voltage, the ADC outputs a negative full-scale code when the negative clipping

voltage is applied to the input of the AMC0x02R. The ADC outputs the mid-range code when 0V is applied to the

input of the AMC0x02R. The ADC outputs a positive full-scale code when the positive clipping voltage is applied

to the input of the AMC0x02R.

The device is linear within the specified linear full-scale range. Beyond the linear full-scale range, the output

continues to follow the input, but with reduced linearity performance. The output clips when the input voltage

reaches the clipping voltage. Figure 7-3 shows the input-to-output transfer characteristic.

VFSR

89 %

100 %

VClipping

50%

VFSR

VClipping

11 %

Linear input range (VFSR)

Maximum input range before clipping (VClipping)

Input Voltage (VIN)

0

Figure 7-3. Input-to-Output Transfer Curve of the AMC0x02R

7.4 Device Functional Modes

The AMC0x02R operates in one of the following states:

• Off-state: The low-side supply (VDD2) is below the VDD2UV threshold. The device is not responsive. OUT is

in Hi-Z state. Internally, OUT is clamped to VDD2 and GND2 by ESD protection diodes.

• Missing high-side supply: The low-side of the device (VDD2) is supplied and within recommended operating

conditions. The high-side supply (VDD1) is below the VDD1UV threshold. The OUT pin is driven to VREFIN / 2.

• Analog input overrange (positive full-scale input): VDD1 and VDD2 are within recommended operating

conditions but the analog input voltage VIN is above the maximum clipping voltage VClipping, MAX. The device

outputs VREFIN at the OUT pin.

• Analog input underrange (negative full-scale input): VDD1 and VDD2 are within recommended operating

conditions but the analog input voltage VIN is below the minimum clipping voltage VClipping, MIN. The OUT pin

is driven to GND2.

• Normal operation: VDD1, VDD2, and VIN are within the recommended operating conditions. The device

outputs a voltage that is proportional to the input voltage.

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