1 Features
• 2-V, high-impedance input voltage range optimized
for isolated voltage measurement
• Fixed gain: 1
• Low DC errors:
– AMC1311:
• Offset error: ±9.9 mV (maximum)
• Offset drift: ±20 μV/°C (typical)
• Gain error: ±1% (maximum)
• Gain drift: ±30 ppm/°C (typical)
– AMC1311B:
• Offset error: ±1.5 mV (maximum)
• Offset drift: ±10 μV/°C (maximum)
• Gain error: ±0.2% (maximum)
• Gain drift: ±40 ppm/°C (maximum)
– Nonlinearity: 0.04% (maximum)
• 3.3-V operation on high-side (AMC1311B)
• High CMTI: 100 kV/μs (minimum) (AMC1311B)
• Missing high-side supply indication
• Safety-related certifications:
– 7000-VPK reinforced isolation per DIN EN IEC
60747-17 (VDE 0884-17)
– 5000-VRMS isolation for 1 minute per UL1577
– Fully specified over the extended industrial
temperature range: –40°C to +125°C

2 Applications
• Isolated voltage sensing in:
– Motor drives
– Frequency inverters
– Uninterruptible power supplies

3 Description
The AMC1311 is a precision, isolated amplifier with
an output separated from the input circuitry by a
capacitive isolation barrier that is highly resistant
to magnetic interference. This barrier is certified to
provide reinforced galvanic isolation of up to 5 kVRMS
according to DIN EN IEC 60747-17 (VDE 0884-17)
and UL1577 and supports a working voltage of up to
1500 VRMS.
The isolation barrier separates parts of the system
that operate on different common-mode voltage levels
and protects the low-voltage side from voltages that
can cause electrical damage or be harmful to an
operator.
The high-impedance input of the AMC1311 is
optimized for connection to high-impedance resistive
dividers or any other high-impedance voltage
signal source. The excellent DC accuracy and
low temperature drift support accurate, isolated
voltage sensing and control in closed-loop systems.
The integrated missing high-side supply voltage
detection feature simplifies system-level design and
diagnostics.
The AMC1311 is offered with two performance grade
options: the AMC1311B is specified over the extended
industrial temperature range of –55°C to +125°C, and
the AMC1311 is specified for operation at –40°C to
+125°C.