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Reference Design
AMC1304L05, AMC1304L25, AMC1304M05, AMC1304M25
SBAS655E – SEPTEMBER 2014 – REVISED JANUARY 2017
AMC1304x High-Precision, Reinforced Isolated Delta-Sigma Modulators with LDO
1 Features
•1 Pin-Compatible Family Optimized for ShuntResistor-Based 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 V VDE V 0884-10 (VDE V 0884-10): 2006-12 – 5000-VRMS Isolation for 1 Minute per UL1577 – CAN/CSA No. 5A-Component Acceptance Service Notice, IEC 60950-1, and IEC 60065 End Equipment Standards
• 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 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 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.
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 .