AMC3302 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 linear input voltage range optimized for

current measurement using shunt resistors

• Fixed gain: 41

• Low DC errors:

– Input offset voltage: ±100 µV (max)

– Input offset drift: ±0.8 µV/°C (max)

– Gain error: ±0.3% (max)

– Gain error drift: ±50 ppm/°C (max)

– Nonlinearity: ±0.03% (max)

• High CMTI: 85 kV/µs (min)

• System-level diagnostic features

• Safety-related certifications:

0884-11

• Meets CISPR-11 and CISPR-25 EMI standards

2 Applications

• Isolated voltage sensing in:

– Motor drives

– Photovoltaic inverters

– Power delivery systems

– Electricity meters

– Protection relays

3 Description

The AMC3302 is a precision, isolated amplifier with a

fully integrated, isolated DC/DC converter that allows

single-supply operation from the low-side of the

device. The reinforced capacitive isolation barrier is

certified according to VDE V 0884-11 and UL1577

and separates sections of the system that operate on

different common-mode voltage levels and protects

low-voltage domains from damage.

The input of the AMC3302 is optimized for direct

connection to shunt resistors or other low voltage-

level signal sources. The integrated isolated DC/DC

converter allows flexible placement of the shunt and

the AMC3302, and makes the device a unique

solution for space-constrained applications.

The excellent performance of the device supports

accurate current monitoring and control, which is an

important feature to achieve low torque ripple in motor

control applications. The integrated DC/DC converter

fault-detection and diagnostic output pin of the

AMC3302 simplify system-level design and

diagnostics.

The AMC3302 is specified over the industrial

temperature range of –40°C to +125°C.

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.

Resonator

And

Driver

LDO

Rectifier

LDO

Diagnostics

AMC3302

ADS8363

16-Bit ADC

DCDC_IN

DCDC_GND

LDO_OUT

VDD

OUTP

OUTN

GND

DIAG

3.3 V / 5 V

GND

To MCU (optional)

DCDC_OUT

DCDC_HGND

HLDO_IN

HLDO_OUT

HGND

INP

INN

NC

I

Application Example

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AMC3302

SBASA11 – AUGUST 2020

Copyright © 2020 Texas Instruments Incorporated

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AMC3302

SBASA11 – AUGUST 2020

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. ADVANCE INFORMATION for preproduction products; subject to change

without notice.