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The ADuM140x1 are 4-channel digital isolators based on Analog Devices' iCoupler® technology. Combining high speed CMOS and monolithic air core transformer technology, these isolation components provide outstanding performance charac-teristics superior to alternatives such as optocoupler devices.
By avoiding the use of LEDs and photodiodes, iCoupler devices remove the design difficulties commonly associated with optocouplers. The typical optocoupler concerns regarding uncertain current transfer ratios, nonlinear transfer functions, and temperature and lifetime effects are eliminated with the simple iCoupler digital interfaces and stable performance characteristics. The need for external drivers and other discretes is eliminated with these iCoupler products. Furthermore, iCoupler devices consume one-tenth to one-sixth the power of optocouplers at comparable signal data rates.
The ADuM140x isolators provide four independent isolation channels in a variety of channel configurations and data rates (see the Ordering Guide). All models operate with the supply voltage on either side ranging from 2.7 V to 5.5 V, providing compatibility with lower voltage systems as well as enabling a voltage translation functionality across the isolation barrier. In addition, the ADuM140x provides low pulse width distortion (<2 ns for CRW grade) and tight channel-to-channel matching (<2 ns for CRW grade). Unlike other optocoupler alternatives, the ADuM140x isolators have a patented refresh feature that ensures dc correctness in the absence of input logic transitions and during power-up/power-down conditions.
ADUM1400 Maximum Ratings
Parameter
Symbol
Min
Max
Unit
Storage Temperature Ambient Operating Temperature Supply Voltages1 Input Voltage1, 2 Output Voltage1, 2 Average Output Current per Pin3 Side 1 Side 2 Common-Mode Transients4
1 All voltages are relative to their respective ground. 2 VDDI and VDDO refer to the supply voltages on the input and output sides of a given channel, respectively. 3 See Figure 3 for maximum rated current values for various temperatures. 4 Refers to common-mode transients across the insulation barrier. Common-mode transients exceeding the Absolute Maximum Ratings can cause latch-up or permanent damage.
ADUM1400 Features
`Low power operation 5 V operation 1.0 mA per channel max @ 0 Mbps to 2 Mbps 3.5 mA per channel max @ 10 Mbps 31 mA per channel max @ 90 Mbps 3 V operation 0.7 mA per channel max @ 0 Mbps to 2 Mbps 2.1 mA per channel max @ 10 Mbps 20 mA per channel max @ 90 Mbps `Bidirectional communication `3 V/5 V level translation `High temperature operation: 105°C `High data rate: dc to 90 Mbps (NRZ) `Precise timing characteristics 2 ns max pulse width distortion 2 ns max channel-to-channel matching `High common-mode transient immunity: >25 kV/s `Output enable function `Wide body 16-lead SOIC package, Pb-free models available `Safety and regulatory approvals UL recognition: 2500 V rms for 1 minute per UL 1577 CSA component acceptance notice #5A VDE certificate of conformity DIN EN 60747-5-2 (VDE 0884 Part 2): 2003-01 DIN EN 60950 (VDE 0805): 2001-12; EN 60950: 2000 VIORM = 560 V peak
ADUM1400 Typical Application
·General-purpose multichannel isolation ·SPI® interface/data converter isolation ·RS-232/RS-422/RS-485 transceiver ·Industrial field bus isolation