1 Features

• ±250-mV input voltage range optimized for current

measurements using shunt resistors

• Fixed gain: 8.2 V/V

• Low DC errors:

– Offset error: ±0.2 mV (max)

– Offset drift: ±0.9 μV/°C (max)

– Gain error: ±0.3 (max)

– Gain drift: ±30 ppm/°C (max)

– Nonlinearity: 0.03 (max)

• 3.3-V or 5-V operation on high-side and low-side

• Missing high-side supply detection feature

• High CMTI: 100 kV/μs (min)

• Low EMI, meets CISPR-11 and CISPR-32

standards

• ≥15.7-mm creepage, stretched SOIC package

• Safety-related certifications:

– 10600-VPK reinforced isolation per DIN EN IEC

60747-17 (VDE 0884-17)

– 7500-VRMS isolation for 1 minute per UL1577

• Fully specified over the extended industrial

temperature range: –40°C to +125°C

2 Applications

• Shunt-resistor-based current sensing in:

– Motor drives

– Frequency inverters

– Solar inverters

– Wind turbine inverters

– Rail transport systems

3 Description

The AMC1400 is a precision, isolated amplifier with

an output separated from the input circuitry by an

isolation barrier that is highly resistant to magnetic

interference. This barrier is certified to provide

reinforced galvanic isolation of up to 7.5 kVRMS

according to DIN EN IEC 60747-17 (VDE 0884-17)

and UL1577, and supports a working voltage of up to

2 kVRMS.

The isolation barrier separates parts of the system

that operate on different common-mode voltage levels

and protects the low-side from voltage levels that can

cause electrical damage and are potentially harmful to

an operator.

The input of the AMC1400 is optimized for direct

connection to a low-impedance shunt resistor or other

low-impedance voltage source with low signal levels.

The excellent DC accuracy and low temperature

drift supports accurate current control in DC/DC

converters, frequency inverters, AC motor drives, and

other applications that must operate at high voltages,

high altitudes, or in environments with high pollution

degrees.

The AMC1400 is offered in a stretched SOIC

package and is specified over the extended industrial

temperature range from –40°C to +125°C .