1 Features

1• Pin-compatible family optimized for shunt-resistorbased

current measurements:

– ±50-mV or ±250-mV input voltage ranges

– CMOS or LVDS digital interface options

• Excellent DC performance supporting highprecision

sensing on system level:

– Offset error: ±50 μV or ±100 μV (max)

– Offset drift: 1.3 μV/°C (max)

– Gain error: ±0.2% or ±0.3% (max)

– Gain drift: ±40 ppm/°C (max)

• Safety-related certifications:

– 7000-VPK reinforced isolation per

DIN VDE V 0884-11: 2017-01

– 5000-VRMS isolation for 1 minute per UL1577

– CAN/CSA no. 5A-component acceptance

service notice and IEC 62368-1 end equipment

standard

• Transient immunity: 15 kV/μs (min)

• High electromagnetic field immunity

(see application note SLLA181A)

• External 5-MHz to 20-MHz clock input for

easier system-level synchronization

• On-chip 18-V LDO regulator

• Fully specified over the extended industrial

temperature range

2 Applications

• Shunt-resistor-based current sensing in:

– Industrial motor drives

– Photovoltaic inverters

– Uninterruptible power supplies

• Isolated voltage measurements

3 Description

The AMC1304 is a precision, delta-sigma (ΔΣ)

modulator with the output separated from the input

circuitry by a capacitive double isolation barrier that is

highly resistant to magnetic interference. This barrier

is certified to provide reinforced isolation of up to

7000 VPEAK according to the DIN VDE V 0884-11,

UL1577 and CSA standards. Used in conjunction with

isolated power supplies, the device prevents noise

currents on a high common-mode voltage line from

entering the local system ground and interfering with

or damaging low voltage circuitry.

The input of the AMC1304 is optimized for direct

connection to shunt resistors or other low voltagelevel

signal sources. The unique low input voltage

range of the ±50-mV device allows significant

reduction of the power dissipation through the shunt

while supporting excellent ac and dc performance. By

using an appropriate digital filter (that is, as integrated

on the TMS320F2807x or TMS320F2837x families) to

decimate the bit stream, the device can achieve 16

bits of resolution with a dynamic range of 81 dB (13.2

ENOB) at a data rate of 78 kSPS.

On the high-side, the modulator is supplied by an

integrated low-dropout (LDO) regulator that allows an

unregulated input voltage between 4 V and 18 V

(LDOIN). The isolated digital interface operates from

a 3.3-V or 5-V power supply (DVDD).

The AMC1304 is available in a wide-body SOIC-16

(DW) package and is specified from –40°C to

+125°C.