AMC3336 High-Precision, ±1-V Input,

Reinforced Isolated Delta-Sigma Modulator With Integrated DC/DC Converter

1 Features

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

converter

• ±1-V input voltage range optimized for voltage

measurements

• Input resistance: 1 GΩ (typ)

• Low DC errors:

– Offset error: ±0.3 mV (max)

– Offset drift: ±4 µV/°C (max)

– Gain error: ±0.2% (max)

– Gain drift: ±40 ppm/°C (max)

• High CMTI: 90 kV/µs (min)

• System-level diagnostic features

• Low EMI: Meets CISPR-11 and CISPR-25

standards

• Safety-related certifications:

– 6000-VPEAK 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 voltage sensing in:

– Motor drives

– Photovoltaic inverters

– Power delivery systems

– Protection relays

3 Description

The AMC3336 is a precision, isolated delta-sigma

(ΔΣ) modulator, optimized for high-impedance AC

voltage 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 AMC3336 is optimized for direct

connection to a resistor network or other, high-

impedance voltage-signal source. The excellent DC

accuracy and low temperature drift support accurate

voltage measurements over the extended industrial

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

By using a digital filter (such as a sinc3 filter) to

decimate the bitstream, the device can achieve 16

bits of resolution with a dynamic range of 85 dB at a

data rate of 78 kSPS.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

AMC3336

SOIC (16)

10.30 mm × 7.50 mm

(1)

For all available packages, see the orderable addendum at

the end of the datasheet.

AMC3336

û -ADC

Isolated

Isolated

Power

Isolated

Power

HGND

INP

INN

DCDC_OUT

DCDC_HGND

HLDO_IN

HLDO_OUT

NC

+1.0 V

0 V

DCDC_IN

DCDC_GND

LDO_OUT

VDD

DOUT

CLKIN

GND

DIAG

MCU

Low-side supply

(3.3 V or 5 V)

±1.0 V

Typical Application

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AMC3336

SBASA70 – APRIL 2021

Copyright © 2021 Texas Instruments Incorporated

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AMC3336

SBASA70 – APRIL 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.