ADUM-1201 Magnetic Isolator Module

ADUM-1201 Magnetic Isolator Module is a high-speed, dual-channel digital isolator based on Analog Devices’ proprietary iCoupler® technology, which uses miniature, on-chip transformers to achieve signal isolation. This module effectively separates ground potentials and blocks noise while allowing digital signals to pass between two different electrical domains. By eliminating the need for bulky optocouplers, the ADuM1201 provides faster switching speeds, higher reliability, and significantly reduced power consumption in a compact form factor. Engineers rely on this module to protect sensitive low-voltage circuitry from high-voltage spikes, ground loops, and electrical interference in industrial, medical, and power supply systems, ensuring both safety and data integrity across the isolation barrier.

Key Features:

• iCoupler® Technology: Utilizes chip-scale transformer technology for robust, high-speed, and low-power isolation.
• Dual-Channel Isolation: Provides two independent signal channels for bidirectional communication or separated signal paths.
• High Data Rate: Supports fast digital signal transmission, often up to 25 Mbps or higher, suitable for SPI, I²C, and other high-speed interfaces.
• Robust Insulation: Offers a high transient immunity and withstands high voltage levels between the two power domains.
• Low Power Consumption: Operates at significantly lower current levels than traditional optocouplers, improving overall system efficiency.

Technical Specifications:

• Isolation Method: Magnetic Coupling (iCoupler® technology)
• Number of Channels: 2
• Data Rate (Max): Up to 25 Mbps (typical, check datasheet for specific grade)
• Supply Voltage (V_DD1, V_DD2): 3.0 V to 5.5 V
• Withstand Voltage: ≈ 2.5 kV RMS (Typical rating)
• Logic Compatibility: CMOS/TTL

Mechanical Specifications:

• Module Type: Breakout Board (ADuM1201 IC mounted on PCB)
• Pin Pitch: 2.54 mm (0.1 in) standard header pins
• Mounting: Through-hole soldering or breadboard compatible.

Dimensions:

• PCB Length: ≈ 19 mm
• PCB Width: ≈ 15 mm
• Weight: ≈ 2 g

Pinout and Wiring:

• V_DD1 (Side 1 Power): Connect the power supply (3.0 V to 5.5 V) for the low-voltage side (e.g., microcontroller).
• GND1 (Side 1 Ground): Connect the ground for the low-voltage side.
• V_DD2 (Side 2 Power): Connect the power supply for the high-voltage/isolated side.
• GND2 (Side 2 Ground): Connect the ground for the high-voltage/isolated side.
• IN A, OUT A (Channel 1): Digital signal input and output for the first isolation channel.
• IN B, OUT B (Channel 2): Digital signal input and output for the second isolation channel.
• Wiring Note: Ensure the V_DD1/GND1 pair and the V_DD2/GND2 pair remain electrically isolated; these are the two separate domains.

Datasheet Reference:

• Download Datasheet

Commonly Used in:

• Industrial Automation: Isolating control signals from noisy motor drivers or sensors.
• Medical Equipment: Providing patient isolation from dangerous mains voltages.
• Power Supply Monitoring: Safely measuring voltages and currents in high-side switch circuits.

Applications:

• Serial Communication Isolation: Isolating UART, SPI, or I²C communication lines between two systems.
• High-Speed Data Acquisition: Protecting data logging systems from environmental electrical interference.
• Ground Loop Elimination: Breaking common-mode paths that cause data corruption and system instability.

Equivalent Models:

• ADUM1200: A similar dual-channel isolator, often used for slightly different channel directionality.
• Optocouplers (e.g., PC817): Traditional but slower and higher-power alternatives.
• Si84xx Series (Silicon Labs): Digital isolators based on capacitive isolation technology.

Package Includes:

• 1 x ADUM-1201 Magnetic Isolator Module