AMC1311x High-Impedance, 2-V Input, Reinforced Isolated Amplifiers

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.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

AMC1311

SOIC (8)

5.85 mm × 7.50 mm

AMC1311B

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

ADC

VDD2

Low-side supply

(3.3 V or 5 V)

AMC1311B

OUTP

OUTN

GND2

GND1

IN

SHTDN

VDD1

RSNS

High-side supply

(3.3 V or 5 V)

R2

R1

VDC

2 V

VCMout

0..2V

Simplified Schematic

AMC1311

SBAS786C – DECEMBER 2017 – REVISED JUNE 2022

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.