DCDC_OUT

Resonator

And

Driver

DCDC_HGND

HLDO_IN

HLDO_OUT

HGND

INP

INN

LDO

Rectifier

LDO

Diagnostics

DCDC_IN

DCDC_GND

LDO_OUT

VDD

DOUT

CLKIN

GND

AMC3306

û -ADC

Isolated

DIAG

NC

I

TMS320F2807x

SD-Dx

SD-Cx

optional

3.3 V / 5 V

GND

Product

Folder

Order

Now

Technical

Documents

Tools &

Software

Support &

Community

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 pre-production products; subject to

change without notice.

AMC3306M25

SBAS996 – MAY 2020

AMC3306M25 High-Precision, Reinforced Isolated Delta-Sigma Modulator

With Integrated DC/DC Converter and High CMTI

1

1 Features

1

•

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

converter

•

±250-mV input voltage range optimized for current

measurement using shunt resistors

•

Low DC errors:

–

Offset error: ±100 µV (max)

–

Offset drift: 1 µV/°C (max)

–

Gain error: ±0.2% (max)

–

Gain drift: ±40 ppm/°C (max)

•

High CMTI: 75 kV/µs (min)

•

System-level diagnostic features

•

Safety-related certifications:

–

0884-11

–

•

Meets and exceeds CISPR-11 and CISPR-25 EMI

standards

2 Applications

•

Compact, isolated shunt-based current sensing in:

–

Photovoltaic inverters

–

Uninterruptible power supplies (UPS)

–

Power delivery systems

–

Industrial robots

–

Compact frequency inverters

3 Description

The AMC3306M25 is a precision, delta-sigma (ΔΣ)

modulator,

optimized

for

shunt-based

current

measurements, 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. This isolation barrier separates parts

of the system that operate on different common-mode

voltage levels and protects lower-voltage parts from

damage.

The input of the AMC3306M25 is optimized for direct

connection to shunt resistors or other, low voltage-

level signal sources. The integrated isolated DC/DC

converter allows unconstrained placement of the

shunt, independent of any high-side supply that is

usually required to power the isolated amplifier, and

makes the device a unique solution for space-

constrained applications.

The

device

supports

excellent

AC

and

DC

performance over its linear input voltage range of

±250 mV. By using a digital filter or delta-sigma-filter

module

(such

as

those

integrated

in

the

TMS320F2807x or TMS320F2837x microcontroller

families) 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.

The

AMC3306M25

is

fully

specified

over

the

extended industrial temperature range of –40°C to

+125°C.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

AMC3306M25

SOIC (16)

10.30 mm × 7.50 mm

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

Simplified Schematic