ISO7240CDW Functional Description and Applications

Functional Overview

The ISO7240CDW is a high-performance quad-channel digital isolator from Texas Instruments, 

designed to provide galvanic isolation between digital circuits while enabling high-speed data transmission.

 Leveraging capacitive isolation technology, it offers robust noise immunity, low power consumption,

 and reliable operation in harsh environments. Key functional features include:

• Quad-Channel Isolation: Four independent channels for bidirectional or unidirectional signal routing (configurable via pin options).
• High Data Rate: Supports up to 150 Mbps, suitable for high-speed interfaces like USB, SPI, and LVDS.
• Wide Supply Voltage: Operates from 2.5V to 5.5V on both input and output sides, with channel-by-channel voltage compatibility.
• Low Power Consumption: Typically 1.5mA per channel at 5V, ideal for low-power and multi-channel systems.
• High Isolation Voltage: 2500V RMS (min) for reinforced isolation, meeting safety standards (UL 1577, VDE 0884-10).
• TTL/CMOS Compatibility: Supports input/output levels from 2.5V to 5V, with flexible logic thresholds.

Key Applications

1. Industrial Automation
   • Isolation for multi-channel sensor interfaces, PLC communication, and motor control systems.
   • Protection against ground loops in factory automation networks (e.g., EtherCAT, Modbus).
2. Medical Devices
   • Patient safety isolation in multi-channel diagnostic equipment (e.g., multi-lead ECG, dialysis machines).
   • Isolated data transmission in medical imaging systems to prevent electrical hazards.
3. Power Electronics
   • Isolation between control circuits and high-voltage power stages in inverters, DC-DC converters, and UPS systems.
   • Gate drive isolation for IGBTs and MOSFETs in renewable energy applications.
4. Automotive Systems
   • Multi-channel CAN/LIN bus isolation in vehicle control units (ECUs) and infotainment systems.
   • Sensor interface isolation for automotive safety systems (e.g., ADAS, braking controls).
5. Test and Measurement Equipment
   • Isolated data acquisition in multi-channel oscilloscopes, logic analyzers, and industrial meters.
   • Protection of sensitive measurement circuits from high-voltage transients.
6. Communication Infrastructure
   • Isolation for backplane interfaces, telecom line cards, and network equipment to prevent noise interference.
   • SPI/I2C bus isolation in distributed communication systems.

Application Circuit Example

 +--------+     +----------------+     +--------+
MCU Side  |        |     |                |     |        |  Sensor Side
Signal In --| ISO7240CDW|--|  Signal Conditioning |-- Sensor Signals
Channel 1   |  (4-ch Isolator) |     Circuitry      |  Channel 1
Channel 2   |        |     |                |     |        |  Channel 2
Channel 3   |        |     |                |     |        |  Channel 3
Channel 4   |        |     |                |     |        |  Channel 4
          +--------+     +----------------+     +--------+
              |                          |
              ↓                          ↓
        VDD1 (2.5V-5.5V)            VDD2 (2.5V-5.5V)
              |                          |
              +--------------------------+
                          |
                    Isolated Power Supply 

Technical Specifications Summary

Design Considerations

• Channel Configuration: Configure each channel for bidirectional or unidirectional operation using input enable pins.
• Power Supply Isolation: Use isolated DC-DC converters for VDD1 and VDD2 to maintain complete galvanic separation.
• Layout Optimization: Route signals separately for each channel, keep traces short, and use ground planes to minimize crosstalk.
• ESD and Transient Protection: Add TVS diodes on the isolated side for applications exposed to voltage spikes (e.g., industrial environments).
• Thermal Management: Ensure proper PCB thermal vias for high-temperature applications, as the device supports up to +125°C junction temperature.

The following parts are popular search parts in Digital Isolators.

The following parts include "ISO7240CDW" in ISSI, Integrated Silicon Solution Inc“ISO7240CDW”.

• Part Number
• Manufacturer
• Package
• Description