AMC3302 High-Precision, ±50-mV Input,

Reinforced Isolated Amplifier With Integrated DC/DC Converter

1 Features

• 3.3-V or 5-V single supply with integrated DC/DC

converter

• ±50-mV input voltage range optimized for current

measurement using shunt resistors

• Fixed gain: 41

• Low DC errors:

– Offset voltage: ±50 μV (max)

– Offset drift: ±0.5 μV/°C (max)

– Gain error: ±0.2% (max)

– Gain error drift: ±35 ppm/°C (max)

– Nonlinearity: ±0.03% (max)

• High CMTI: 95 kV/µs (min)

• System-level diagnostic features

• Meets CISPR-11 and CISPR-25 EMI standards

• Safety-related certifications:

– 6000-VPK reinforced isolation per DIN VDE V

0884-11

– 4250-VRMS isolation for 1 minute per UL1577

• Fully specified over the extended industrial

temperature range: –40°C to +125°C

2 Applications

• Isolated current sensing in:

– Protection relays

– Motor drives

– Power supplies

– Photovoltaic inverters

3 Description

The AMC3302 is a precision, isolated amplifier

optimized for shunt-based current measurements.

The fully integrated, isolated DC/DC converter allows

single-supply operation from the low-side of the

device, which makes the device a unique solution

for space-constrained applications. The reinforced

capacitive isolation barrier is certified according to

VDE V 0884-11 and UL1577 and supports a working

voltage of up to 1.2 kVRMS.

The isolation barrier separates parts of the system

that operate on different common-mode voltage levels

and protects the low-voltage side from hazardous

voltages and damage.

The input of the AMC3302 is optimized for direct

connection to a low-impedance shunt resistor

or another low-impedance voltage source with

low signal levels. The excellent DC accuracy

and

low

temperature

drift

supports

accurate

current measurements over the extended industrial

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

The integrated DC/DC converter fault-detection and

diagnostic output pin of the AMC3302 simplify

system-level design and diagnostics.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

AMC3302

SOIC (16)

10.30 mm × 7.50 mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

To MCU (optional)

AMC3302

Isolated

Power

Isolated

Power

HGND

INP

INN

DCDC_OUT

DCDC_HGND

HLDO_IN

HLDO_OUT

NC

I

+50 mV

0 V

± 50 mV

DCDC_IN

DCDC_GND

LDO_OUT

VDD

OUTN

OUTP

GND

DIAG

Low-side supply

(3.3 V or 5 V)

±2.05 V

VCMout

ADC

Typical Application

AMC3302

SBASA11B – AUGUST 2020 – REVISED JULY 2021

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.