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Field-Side Self-Powered, 4-Channel, 12-bit, Isolated ADC

4-Channel, Multiplexed, 12-Bit Analog-To-Digital Converter (ADC) with Integrated, Isolated, DC-DC Converter

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • Enable Robust Detection of Multichannel Analog/Binary Inputs
    • Withstands 3.5kVRMS Isolation for 60s (VISO) for the SSOP Package
    • Withstands 5kVRMS Isolation for 60s (VISO) for the Wide SOIC Package
    • 5.5mm of Creepage and Clearance for 20-pin or 28-pin SSOP Package
    • 8mm of Creepage and Clearance for 16-pin Wide SOIC Package
    • Group II CTI Package Material
  • Reduces BOM and Board Space Through High Integration
    • Field-Side Self-Powered with Integrated DC-DC Supply
    • 12-bit, 20ksps Per-Channel ADC
    • Programmable Threshold Comparators for each Channel
    • Isolation for both Data and DC-DC Supply
    • Integrated 1.8V Reference
  • Increase System “Up Time” and Simplifies System Design & Maintenance
    • Field-Side ADC Functionality Diagnostics
    • Field-Side Continuous Power Monitoring
    • Communication System Self-Diagnostics
  • Flexible Control and Interface
    • Programmable Upper and Lower Input Threshold Enable Programmable Hysteresis
    • Comparator Output (COUT_) Pins for Fastest Response
    • SPI Interface with CRC Option
    • Precision Internal Reference ±1% (typ)
    • -40°C to +125°C Operating Temperature Range

Applications/Uses

  • High-Voltage Binary Input
  • Substation Automation
  • Distribution Automation
  • Process Automation
  • Motion Control

Description

The MAX22530–MAX22532 are galvanically isolated, 4-channel, multiplexed, 12-bit, analog-to-digital converters (ADC) in the MAXSafe™ family product line. An integrated, isolated, DC-DC converter powers all field-side circuitry, and this allows field-side diagnostics even when no input signal is present.

The MAX22530–MAX22532 family continually digitizes the input voltage on the field-side of an isolation barrier and transmits the data across the isolation barrier to the logic-side of the devices where the magnitude of the input voltage is compared to programmable thresholds. The 12-bit ADC core has a sample rate of 20ksps (typ) per-channel. ADC data is available through the SPI interface either directly or filtered. Filtering averages the most recent 4 readings depending on the setting.

Each input has a comparator with programmable high and low thresholds, and an interrupt is asserted when any input crosses its programmed level based on the mode setting. The comparator output pin (COUT_) is high when the input voltage is above the upper threshold and low when it is below the lower threshold in digital input mode. Response time of the comparator to an input change is less than 75ms (typ) with filtering disabled. With filtering enabled, the comparator uses the moving average of the last 4 ADC readings.

The MAX22530 in a 16-pin wide SOIC package provides 8mm of creepage and clearance, and 5kVRMS isolation. The MAX22531 in a 20-pin SSOP package and the MAX22532 in a 28-pin SSOP package, both provide 5.5mm of creepage and clearance, and 3.5kVRMS isolation. All package material has a minimum comparative tracking index (CTI) of 400, which gives it a group II rating in creepage tables.

All devices are rated for operation at ambient temperatures between -40°C to +125°C.

Simplified Block Diagram

MAX22530, MAX22531, MAX22532: Four-Channel Isolated ADC MAX22530, MAX22531, MAX22532: Four-Channel Isolated ADC Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .