AMC1305L25 Datasheet, PDF (1/39 Pages) Texas Instruments – AMC1305x High-Precision, Reinforced Isolated Delta-Sigma Modulators

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AMC1305L25, AMC1305M05, AMC1305M25
SBAS654C – JUNE 2014 – REVISED DECEMBER 2014
AMC1305x High-Precision,
Reinforced Isolated Delta-Sigma Modulators
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 ±150 µV (max)
– Offset Drift: 1.3 µV/°C (max)
– Gain Error: ±0.3% (max)
– Gain Drift: ±40 ppm/°C (max)
• Certified Isolation Barrier:
– Reinforced Isolation Rating
– 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
• 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 Sensing
3 Description
The AMC1305 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 AMC1305 is optimized for direct connection to
shunt resistors or other low voltage level signal
sources while supporting excellent dc and ac
performance. Shunt resistors are typically used to
sense currents in motor drives, green energy
generation systems, or other industrial applications.
By using an appropriate digital filter (that is, as
integrated on the TMS320F2837x) to decimate the bit
stream, the device can achieve 16 bits of resolution
with a dynamic range of 85 dB (13.8 ENOB) at a data
rate of 78 kSPS.
On the high-side, the modulator is supplied with a
nominal voltage of 5 V (AVDD), whereas the isolated
digital interface operates from a 3.3-V or 5-V power
supply (DVDD).
The AMC1305 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)
AMC1305x
SOIC (16)
10.30 mm × 7.50 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Simplified Schematic
HV+
Floating
Power Supply
Gate Driver
5.0 V
AMC1305
AVDD
DVDD
3.3 V, or 5.0 V
To Load
RSHUNT
Gate Driver
AGND
AINP
AINN
DGND
DOUT
CLKIN
SD-Dx
SD-Cx
TMS320F2837x
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.