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.