AMC1304L05_15 Datasheet, PDF (1/39 Pages) Texas Instruments – AMC1304x High-Precision,Reinforced Isolated Delta-Sigma Modulators with LDO

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AMC1304L05, AMC1304L25, AMC1304M05, AMC1304M25
SBAS655C – SEPTEMBER 2014 – REVISED SEPTEMBER 2015
AMC1304x High-Precision,
Reinforced Isolated Delta-Sigma Modulators with LDO
1 Features
•1 Pin-Compatible Family Optimized for Shunt-
Resistor-Based Current Measurements:
– ±50-mV or ±250-mV Input Voltage Ranges
– CMOS or LVDS Digital Interface Options
• Excellent DC Performance Supporting High-
Precision 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)
• Certified Isolation Barrier:
– Reinforced Isolation Rating
– DIN VDE V 0884-10, UL1577, and
CSA Approved
– Isolation Voltages: 7000 V_PEAK, 10000 V_SURGE
– Working Voltages: 1500 V_DC, 1000 V_{AC, rms}
– 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 V_PEAK according to the DIN V VDE V 0884-10,
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 voltage-
level 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.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
AMC1304x
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
HV+
Floating
Power Supply
4 V to 18 V
AMC1304
LDOIN
DVDD
3.3 V, or 5.0 V
To Load
RSHUNT
Gate
Driver
VCAP
DGND
AGND
AINP
AINN
DOUT
CLKIN
SD-Dx
SD-Cx
TMS320F28x7x
Gate
Driver
HV-
1
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.