ISO7740FDBQ

Common Mode Transient Immunity (Min):	85kV/µs
Supplier Device Package:	16-SSOP
Package / Case:	16-SSOP (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-55°C ~ 125°C
Voltage - Supply:	2.25 V ~ 5.5 V
Rise / Fall Time (Typ):	2.4ns, 2.4ns
Pulse Width Distortion (Max):	4.9ns
Propagation Delay tpLH / tpHL (Max):	16ns, 16ns
Data Rate:	100Mbps
Series:	--
Voltage - Isolation:	5000Vrms
Channel Type:	Unidirectional
Inputs - Side 1/Side 2:	4/0
Number of Channels:	4
Isolated Power:	No
Type:	General Purpose
Technology:	Capacitive Coupling
Part Status:	Active
Packaging:	Tube

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Digital Isolators

ISO7740FDBQ application field and working principle

Digital Isolators are commonly used in electrical and electronic devices for various applications. Specifically, the ISO7740FDBQ Isolators are designed for reliable isolation between a high voltage power source and the control circuitry. The device is based on the latest CMOS (Complementary Metal Oxide Semiconductor) technology which offers superior signal-level performance while consuming minimal power. This isolator is able to operate in a wide temperature range and provide insulation while maintaining low voltage drop-off and low power consumption.Typical Applications

• Data acquisition systems
• Automation and process control systems
• Industrial control systems
• Medical imaging systems
• Communication systems

Device OverviewThe ISO7740FDBQ Isolator consists of two isolated channels: a high voltage power supply and a control channel. It is designed with an on-chip diode-bridge to provide a 1:1 current drive for both channels. The isolation voltage rating is 5kV between the high-voltage and low-voltage channels. The isolation capacitance is typically 8pF.The device also features a signal-ground-referenced logic-level input/output driver, which is compatible with either 5V or 3.3V TTL logic lines. It has an output slew rate of typically 7ns at 5V. Additionally, the device is able to withstand a -20V transient on the control channel without damage.Working PrincipleThe device works by providing a barrier between the high voltage power and the control circuit. It does this by converting the alternating current from the power source into a direct current, then providing an insulated path for the DC to flow in and out of the control circuit. It is able to do this by using a diode-bridge, which converts AC to DC and provides galvanic isolation between the two channels.The device also includes a logic-level input/output driver, which is used for communication between the power and control channels. It uses two analog-to-digital converters to perform the translation from analog to digital signals. This allows the control circuits to send and receive signals while remaining electrically isolated.ConclusionThe ISO7740FDBQ Isolator is an ideal solution for providing safe, reliable isolation between a high-voltage power source and a low-voltage control circuit. It can operate in a wide temperature range while offering low voltage drop-off and low power consumption. Additionally, it is capable of translating analog signals to digital signals, in order to allow for the communication between the two channels. This device provides the perfect combination of safety, reliability, and performance.

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