SBAS512E April   2011  – September 2015 AMC1204

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configurations
  6. Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics
    6. 6.6  Timing Requirements
    7. 6.7  Regulatory Information
    8. 6.8  IEC Safety Limiting Values
    9. 6.9  IEC 61000-4-5 Ratings
    10. 6.10 IEC 60664-1 Ratings
    11. 6.11 Isolation Characteristics
    12. 6.12 Isolator to Package in title of Isolator Characteristics tablePackage Characteristics
    13. 6.13 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Analog Input
      2. 7.3.2 Modulator
      3. 7.3.3 Digital Output
    4. 7.4 Device Functional Modes
  8. Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Digital Filter Usage
    2. 8.2 Typical Application
      1. 8.2.1 Frequency Inverter Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Example of a Resolver-Based Motor Control Analog Front End
      3. 8.2.3 Isolated Voltage Sensing
        1. 8.2.3.1 Design Requirements
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Related Links
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • ±250-mV Input Voltage Range Optimized for Shunt Resistors
  • Certified Digital Isolation:
    • CSA, VDE V 0884-10, and UL1577 Approved
    • Isolation Voltage: 4250 VPEAK (AMC1204B)
    • Working Voltage: 1200 VPEAK
    • Transient Immunity: 15 kV/µs
  • Long Isolation Barrier Lifetime
    (see Application Report SLLA197)
  • High Electromagnetic Field Immunity
    (see Application Note SLLA181A)
  • Outstanding AC Performance:
    • SNR: 84 dB (Minimum)
    • THD: –80 dB (Maximum)
  • Excellent DC Precision:
    • INL: ±8LSB (Maximum)
    • Gain Error: ±2% (Maximum)
  • External Clock Input for Easier Synchronization
  • Fully Specified Over the Extended Industrial Temperature Range

2 Applications

  • Shunt Resistor Based Current Sensing in:
    • Motor Control
    • Green Energy
    • Inverter Applications
    • Uninterruptible Power Supplies

3 Description

The AMC1204 and AMC1204B are 1-bit digital output, isolated delta-sigma (ΔΣ) modulators that can be clocked at up to 20 MHz. The digital isolation of the modulator output is provided by a silicon dioxide (SiO2) barrier that is highly resistant to magnetic interference. This barrier has been certified to provide basic galvanic isolation of up to 4000 VPEAK (AMC1204) and 4250 VPEAK (AMC1204B) according to UL1577, VDE V 0884-10, and CSA standards or specifications.

The AMC1204 and AMC1204B provide a single-chip solution for measuring the small signal of a shunt resistor across an isolated barrier. These types of resistors are typically used to sense currents in motor control inverters, green energy generation systems, and other industrial applications. The AMC1204 and AMC1204B differential inputs easily connect to the shunt resistor or other low-level signal sources. An internal reference eliminates the need for external components. When used with an appropriate external digital filter, an effective number of bits (ENOB) of 14 is achieved at a data rate of 78 kSPS.

A 5-V analog supply (AVDD) is used by the modulator while the isolated digital interface operates from a 3-V, 3.3-V, or 5-V supply (DVDD). The AMC1204 and AMC1204B are available in SOIC-16 (DW) and SOIC-8 (DWV) packages and are specified from –40°C to 105°C.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
AMC1204 SOIC (16) 10.30 mm × 7.50 mm
SOIC (8) 5.85 mm × 7.50 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

AMC1204 AMC1204B fbd_sbas512.gif