IL612-2 NVE, IL612-2 Datasheet - Page 10

• Manufacturer Part Number: IL612-2
• Description: ISOLATOR TX/RX 8PDIP
• Manufacturer: NVE
• Series: IsoLoop®r

Specifications of IL612-2

• Inputs - Side 1/side 2: 1/1
• Number Of Channels: 2
• Isolation Rating: 2500Vrms
• Voltage - Supply: 3 V ~ 5.5 V
• Data Rate: 100Mbps
• Propagation Delay: 12ns
• Output Type: CMOS
• Package / Case: 8-DIP (0.300", 7.62mm)
• Operating Temperature: -40°C ~ 85°C
• Lead Free Status / Rohs Status: Contains lead / RoHS non-compliant
• Other names: 390-1042-5

Applications Information
IL600-Series Isolators are current mode devices. This means that a current of a certain magnitude and direction must flow in the
input coil to change the output logic state. Figure 4 shows a simplified transfer curve for a typical IL600-Series data channel.
of approximately −3.5 mA or −1.5 mA will cause the device to hover around the comparator switching thresholds producing an
unstable output. For single-ended operation across the entire temperature range and power supply range, the magnitude of the coil
current for a logic low should be at least −5 mA, and the magnitude of the coil current for a logic high should be between −0.5 mA
and 0 mA. The stated direction of the current is negative in Figure 4 because the magnetic field is negative with respect to Earth
Field. Current is always fed into the In− terminal of an IL600-Series device. Since these currents are actually sourced, not sunk by
the user, the specified currents are quoted as positive values in the Electrical Specifications section of this data sheet.
When designing circuits using digital logic, most designers are aware that the input to a logic gate is differential with respect to
ground. Separate ground layers, star points or planes usually need to be designed into circuit boards with fast switching currents to
reduce ground voltage bounce caused by inductance in ground returns. Ground error voltages can cause data errors in high-speed
circuits due to their impact on the effective logic threshold voltage at any given instant. Similarly, when using IL600-Series
devices, the designer should be aware that it is the voltage magnitude across the coil that creates the current, not just the value of
the input voltage. To illustrate this point, consider the single-ended non-inverting and inverting cases.
Figure 4. IL600-Series Transfer Function
Window of Operation
-10 -9 -8
-7 -6 -5 -4 -3 -2 -1 0
Bridge o/p (mV)
60
40
20
-20
-40
-60
5
Comparator Low Threshold
Comparator High Threshold
10
Bridge Output Response
10
Coil Current (mA)
IL600 Series
The transfer function for
this device is
approximately linear. An
applied coil input current
creates a magnetic field
that causes the GMR
bridge output to change in
proportion to the applied
field. The GMR bridge is
connected to a comparator.
When the bridge output is
greater than the
comparator high threshold
level, the output will go
high. Similarly, when the
bridge output is less than
the comparator low
threshold, the output will
go low. The “Window of
Operation” shown in
Figure 4 highlights the
specified corners of device
operation. An input current