Texas Instruments AMC3306M25 Bedienungsanleitung

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AMC3306M25 High-Precision, ±250-mV 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

•±250-mV input voltage range optimized for current

measurement using shunt resistors

•Low DC errors:

–Offset error: ±50 µV (max)

–Offset drift: ±1 µV/°C (max)

–Gain error: ±0.2% (max)

–Gain drift: ±35 ppm/°C (max)

•High CMTI: 75 kV/µs (min)

•System-level diagnostic features

•Low EMI: Meets CISPR-11 and CISPR-25

standards

•Safety-related certifications:

–6000-V

PEAK

reinforced isolation per DIN VDE V

0884-11

–4250-V

RMS

isolation for 1 minute per UL1577

•Fully specified over the extended industrial

temperature range: –40°C to +125°C

2 Applications

•Compact, isolated shunt-based current sensing in:

–Protection relays

–Motor drives

–Power supplies

–Photovoltaic inverters

3 Description

The AMC3306M25 is a precision, isolated delta-sigma

(ΔΣ) modulator, 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 kV

RMS

.

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 AMC3306M25 is optimized for direct

connection to a low-impedance shunt resistor or other,

low-impedance voltage sources with low signal levels.

The excellent DC accuracy and low temperature

drift support accurate current measurements over the

extended industrial temperature range from –40°C to

+125°C.

By using a digital filter (such as a sinc

3

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 NUMBERPACKAGEBODY SIZE (NOM)

AMC3306M25SOIC (16)10.30 mm × 7.50 mm

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

the end of the datasheet.

AMC3306M25

Reinforced Isolation

û-ADCIsolated

Isolated

Power

Isolated

Power

HGND

INP

INN

DCDC_OUT

DCDC_HGND

HLDO_IN

HLDO_OUT

NC

RSHUNT

I

+250 mV

0 V

± 250 mV

DCDC_IN

DCDC_GND

LDO_OUT

VDD

DOUT

CLKIN

GND

DIAG

MCU

Low-side supply

(3.3 V or 5 V)

Typical Application

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AMC3306M25

SBAS996B – MAY 2020 – REVISED APRIL 2021

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AMC3306M25

SBAS996B – MAY 2020 – REVISED 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.

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