SBAS771D June   2017  – October 2024 AMC1303E0510 , AMC1303E0520 , AMC1303E2510 , AMC1303E2520 , AMC1303M0510 , AMC1303M0520 , AMC1303M2510 , AMC1303M2520

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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  Power Ratings
    6. 6.6  Insulation Specifications
    7. 6.7  Safety-Related Certifications
    8. 6.8  Safety Limiting Values
    9. 6.9  Electrical Characteristics: AMC1303x05x
    10. 6.10 Electrical Characteristics: AMC1303x25x
    11. 6.11 Switching Characteristics
    12. 6.12 Timing Diagrams
    13. 6.13 Insulation Characteristics Curves
    14. 6.14 Typical Characteristics
  8. 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 Isolation Channel Signal Transmission
      4. 7.3.4 Digital Output
      5. 7.3.5 Manchester Coding Feature
    4. 7.4 Device Functional Modes
      1. 7.4.1 Fail-Safe Output
      2. 7.4.2 Output Behavior in Case of a Full-Scale Input
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Digital Filter Usage
    2. 8.2 Typical Applications
      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 Isolated Voltage Sensing
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curve
      3. 8.2.3 Best Design Practices
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Device Nomenclature
        1. 9.1.1.1 Isolation Glossary
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

Package Options

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

7.3.1 Analog Input

The AMC1303 incorporates a front-end circuitry that contains a differential amplifier and sampling stage, followed by a ΔΣ modulator. The gain of the differential amplifier is set by internal precision resistors to a factor of 4 for devices with a specified input voltage range of ±250mV (for the AMC1303x25x), or to a factor of 20 in devices with a ±50mV input voltage range (for the AMC1303x05x), resulting in a differential input resistance of 4.9kΩ (for the AMC1303x05x) or 22kΩ (for the AMC1303x25x).

For reduced offset and offset drift, the differential amplifier is chopper-stabilized with the switching frequency set at 625kHz. Figure 7-1 shows that the switching frequency generates a spur.

AMC1303E0510 AMC1303M0510 AMC1303E0520 AMC1303M0520 AMC1303E2510 AMC1303M2510 AMC1303E2520 AMC1303M2520 Quantization Noise Shaping
AMC1303xxx20, sinc3 filter, OSR = 2, fIN = 1kHz
Figure 7-1 Quantization Noise Shaping

Consider the input resistance of the AMC1303 in designs with high-impedance signal sources that cause degradation of gain and offset specifications. The importance of this effect, however, depends on the desired system performance. Additionally, the input bias current caused by the internal common-mode voltage at the output of the differential amplifier causes an offset that is dependent on the actual amplitude of the input signal. See the Isolated Voltage Sensing section for more details on reducing these effects.

There are two restrictions on the analog input signals (AINP and AINN). First, if the input voltage exceeds the range AGND – 6V to AVDD + 0.5V, limit the input current to 10mA because the device input electrostatic discharge (ESD) diodes turn on. In addition, the linearity and noise performance of the device are specified only when the differential analog input voltage remains within the specified linear full-scale range (FSR), that is ±250mV (for the AMC1303x25x) or ±50mV (for the AMC1303x05x), and within the specified input common-mode voltage range.