ISO721MD

Common Mode Transient Immunity (Min):	25kV/µs
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Voltage - Supply:	3 V ~ 5.5 V
Rise / Fall Time (Typ):	1ns, 1ns
Pulse Width Distortion (Max):	1ns
Propagation Delay tpLH / tpHL (Max):	16ns, 16ns
Data Rate:	150Mbps
Series:	--
Voltage - Isolation:	2500Vrms
Channel Type:	Unidirectional
Inputs - Side 1/Side 2:	1/0
Number of Channels:	1
Isolated Power:	No
Type:	General Purpose
Technology:	Capacitive Coupling
Part Status:	Active
Packaging:	Tube

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Introduction

Digital Isolators are devices used to electrically isolate two circuits, which is crucial when two circuits need to communicate but have different ground potentials. They are often found in precision circuits such as medical equipment or communication systems, as well as on power controllers. The ISO721MD is one of the specialized digital isolators and is made of complementary metal-oxide semiconductor (CMOS) technology. This article will introduce the applications field and working principle of the ISO721MD.

Applications Field

The ISO721MD interface integrated circuit is designed for use in isolation systems requiring small form factor and low power consumption. It provides an electrically isolated bidirectional data link for short-distance digital communication between two isolated electronics systems. The ISO721MD is a high-speed digital isolation device that has a wide range of applications. It can be used to protect equipments from surges, noise, and electrical interference. This isolator is suitable for applications such as industrial automation, power control, building automation, medical equipment, intrusion detection, avionics, and military systems. It can also be used for point-to-point communication or in multi-point systems with multiple modules.

Working Principle

The ISO721MD uses a proprietary transformer-coupled copper-wire core for electrical isolation. It has two differential input pins that receive data from the master system and two differential output pins that send data from the slave system. The communication speed is up to 1.25Mbits/s. The device works by transforming a logic signal from the input pins to a voltage-mode output, then converting this voltage back to the logic signal on the recieving end. This process isolates the inputs from the outputs while maintaining the integrity of the signal. The ISO721MD also has a built-in electrostatic discharge (ESD) protection circuit and an overvoltage protection circuit, which promote safe operations.

Conclusion

The ISO721MD is a digital isolator designed to provide electrical isolation between two circuits while maintaining signal integrity. It has a wide range of applications in the industrial, medical, and military fields. The device utilizes a transformer-coupled copper-wire core for electrical isolation and is capable of data transmission speeds up to 1.25Mbits/s. It also has built-in ESD and overvoltage protection circuits.

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