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FOD8012A — High CMR, Bi-Directional, Logic Gate Optocoupler
July 2015
FOD8012A
High CMR, Bi-Directional, Logic Gate Optocoupler
Features
• Half Duplex, Bi-Directional
• 20 kV/μs Minimum Common Mode Rejection
• High Speed:
– 15 Mbit/sec Data Rate (NRZ)
– 60 ns Maximum Propagation Delay
– 15 ns Maximum Pulse Width Distortion
– 30 ns Maximum Propagation Delay Skew
• 3.3 V and 5 V CMOS Compatibility
• Extended Industrial Temperate Range, -40 to +110°C
Temperature Range
• Safety and Regulatory Approvals
– UL1577, 3750 VAC
RMS
for 1 min.
– DIN EN/IEC60747-5-2 (approval pending)
Description
The FOD8012A is a half duplex, bi-directional, high-
speed logic gate Optocoupler, which supports isolated
communications allowing digital signals to communicate
between systems without conducting ground loops or
hazardous voltages. It utilizes Fairchild’s patented copla-
nar packaging technology, Optoplanar
®
, and optimized
IC design to achieve minimum 20 kV/μs Common Mode
Noise Rejection (CMR) rating.
This high-speed logic gate optocoupler is highly inte-
grated with 2 optically coupled channels arranged in
bi-directional configuration, and housed in a compact
8-pin small outline package. Each optocoupler channel
consists of a high-speed AlGaAs LED driven by a CMOS
buffer IC coupled to a CMOS detector IC. The detector
IC comprises of an integrated photodiode, a high-speed
trans-impedance amplifier and a voltage comparator with
an output driver. The CMOS technology coupled to the
high efficiency of the LED achieves low power consump-
tion as well as very high speed (60 ns propagation delay,
15 ns pulse width distortion).
Applications
• Industrial Fieldbus Communications
– DeviceNet, CAN, RS485
• Microprocessor System Interface
– SPI, I
2
C
• Programmable Logic Control
• Isolated Data Acquisition System
• Voltage Level Translator
Related Resources
•
FOD8001, High Noise Immunity, 3.3 V/5 V Logic Gate
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