SBAS655E September 2014  – January 2017 AMC1304L05 , AMC1304L25 , AMC1304M05 , AMC1304M25


  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configurations and Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Power Ratings
    6. 7.6 Insulation Specifications
    7. 7.7 Safety-Related Certifications
    8. 7.8 Safety Limiting Values
    9. 7.9 Electrical Characteristics: AMC1304x05
    10. 7.10Electrical Characteristics: AMC1304x25
    11. 7.11Switching Characteristics
    12. 7.12Insulation Characteristics Curves
    13. 7.13Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1Analog Input
      2. 8.3.2Modulator
      3. 8.3.3Digital Output
    4. 8.4Device Functional Modes
      1. 8.4.1Fail-Safe Output
      2. 8.4.2Output Behavior in Case of a Full-Scale Input
  9. Application and Implementation
    1. 9.1Application Information
      1. 9.1.1Digital Filter Usage
    2. 9.2Typical Applications
      1. 9.2.1Frequency Inverter Application
        1. Requirements
        2. Design Procedure
        3. Curve
      2. 9.2.2Isolated Voltage Sensing
        1. Design Requirements
        2. Design Procedure
        3. Curve
      3. 9.2.3Do's and Don'ts
  10. 10Power-Supply Recommendations
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Examples
  12. 12Device and Documentation Support
    1. 12.1Documentation Support
      1. 12.1.1Related Documentation
    2. 12.2Related Links
    3. 12.3Receiving Notification of Documentation Updates
    4. 12.4Community Resources
    5. 12.5Trademarks
    6. 12.6Electrostatic Discharge Caution
    7. 12.7Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Orderable Information


  • 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)
  • 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


  • Shunt-Resistor-Based Current Sensing In:
    • Industrial Motor Drives
    • Photovoltaic Inverters
    • Uninterruptible Power Supplies
  • Isolated Voltage Measurements


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 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)

AMC1304xSOIC (16)10.30 mm × 7.50 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

Simplified Schematic

AMC1304L05 AMC1304L25 AMC1304M05 AMC1304M25 ai_sch_bas655.gif