Analog Devices Inc. MAX22518 Dual-Channel Digital Isolator
Analog Devices MAX22518 Dual-Channel Digital Isolator features integrated field-side supply using ADI's proprietary process technology. The field-side power is supplied by the logic side using an integrated isolated DC-DC converter. This approach eliminates the bulky and expensive external isolated power supply when the power demand of the field side is small. The MAX22518 features basic isolation with a withstand voltage rating of 3.5kVRMS for 60s or 445VRMS of continuous operation. With a single resistor on each input, the inputs of the MAX22518 can withstand 1.2/50μs surge pulses up to ±2kV between inputs (common mode) or up to ±1kV between input and field ground (differential), as well as continuous shorts to 24VAC.
Both sides of the isolators are powered from a single 3.0V to 5.5V supply on the logic side, which also sets the output logic level. Both channels of the MAX22518 transfer data from the field side to the logic side and are always enabled. Each output is high when the corresponding input is high and low when the corresponding input is low.
The ADI MAX22518 is available in an 8-pin wide-body SOIC package with 5.5mm of creepage and clearance. The package material has a minimum comparative tracking index (CTI) of 400V, which gives it a group II rating in creepage tables. Analog Devices MAX22518 Dual-Channel Digital Isolator is rated for operation at an ambient temperature range of -40°C to +125°C.
Features
- Robust protection in small footprint
- Integrated isolated field-side supply
- Integrated galvanic digital isolation
- Integrated surge and short protection with an external series resistor
- 24VAC short protection
- ±1kV line-to-ground and ±2kV line-to-line surge tolerance (1.2/50μs waveform)
- Compact 8-pin wide-body SOIC package (5.5mm creepage)
- Robust galvanic isolation of digital signals
- 5kVRMS isolation voltage for 60s (VISO)
- 445VRMS continuous working voltage (VIOWM)
- Design flexibility
- 220μA field-side supply external load capability
- 3.0V to 5.5V logic-side supply
- -40°C to +125°C operating temperature range
- RoHS compliant
- Safety regulatory approvals
- UL according to UL1577
- cUL according to CSA Bulletin 5A
Applications
- Industrial IoT
- Industrial networking systems
- Building automation
- Medical equipment
Videos
Block Diagram
Test Circuit & Timing Diagram
Development Tool
Analog Devices Inc. MAX22518EVKIT Evaluation Kit
Demonstration platform for the MAX22518 Digital Isolator, also supports MAX22517 and MAX22519.