Fairchild has developed single- and dual-channel optocouplers that deliver a 25-KV/µs minimum common-mode noise rejection (CMR) rating, a high bandwidth data rate of 15-Mbits/s, and low-power consumptionfeatures that make the devices well-suited for industrial control applications.
15MBd optocouplers deliver high common-mode noise rejection (CMR) rating that is said to be two-and-a-half times higher than the closest competitor.
South Portland, MaineFairchild Semiconductor's single-and dual-channel 15MBd optocouplers provide industrial equipment manufactures with a 25-KV/µs minimum common-mode noise rejection (CMR) rating that the company claims is 250% higher than its closest competitor.
Fairchild attributes the high CMR rating to its Optoplanar technology, which it says reduces package capacitance more than 30% compared with competitive parts. The package capacitance enables the single- and dual-channel optocouplers, part numbers FOD0708 and FOD0738 respectively, to deliver 50-KV/µs common mode immunity when a 3-KV peak pulse is applied.
The FOD0708 and FOD0738 optocouplers consist of an ALGaAS LED optically coupled to a high-speed trans-impedance amplifier and voltage comparator. They feature a high-bandwidth data rate of 15-Mbits/s.
They are designed with a push-pull detector that eliminates the need for a pull-up resistor, which reduces power consumption without penalizing bandwidth, according to John Constantino, manager of Fairchild's optoelectronics product line.
"Noise can cause data errors in industrial control environments, adversely affecting applications such as line receivers on an automated factory floor," Constantino said. "The FOD07X8 optocouplers offer our customers the industry's best available common-mode noise immunity to solve this problem."
The FOD0708 and FOD0738 optocouplers' electrical characteristics are guaranteed beyond the industrial temperature range of -40° to +100°C.
In 1,000-piece quantities, the FOD0708 single-channel optocoupler costs $1.45, and the FOD0738 dual-channel device costs $2.83.
For a datasheets of these products in PDF format, please go to: www.fairchildsemi.com/ds/FO/FOD0708.pdf
Fairchild Semiconductor, 1-800-341-0392, www.fairchildsemi.com