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New Additions to Vishay's MicroFace IrDA Transceiver Family Enable Streamlined Designs, New Choices For Operating Distance and Power Savings
MALVERN, PENNSYLVANIA-February 7, 2001-Vishay Intertechnology, Inc. (NYSE: VSH) has announced the release of three new additions to its MicroFace series of IrDA-compliant transceivers, expanding the options available to designers in the industry's smallest package for this device type. The expanded series now offers increased operating distance and varying power supply options, and is optimized for use in space-limited, power-restricted products, including PDAs, cellular phones, pagers, and other handheld battery-operated equipment.
With typical dimensions of just 7.3 mm x 4.55 mm x 2.8 mm, the new Vishay Telefunken TFDU4202, TFDU4203, and TFDU4204 all feature a wide supply voltage range from 2.4 V to 5.5 V, and are operational down to 2 V. With high electromagnetic interference immunity and built-in current control, the transceivers require the fewest external components for a complete infrared data communications solution.
Compared with the first MicroFace transceiver, the TFDU4201, Vishay's new TFDU4203 provides increased output intensity, allowing for a greater operating distance. TFDU4203 features include a maximum operating distance close to 70 cm - more than the IrDA's low-power standard, but still small enough to allow for a single power supply and reduced power consumption as compared to a full 1-m range device. It operates on as little as 65 μA in the receive mode and 0.01 μA in the shutdown mode.
At lower operating voltages up to 3.3 V, the new TFDU4202 can be operated without an external current limiting resistor to achieve a range above 1 m. It additionally features a split power supply, a technology first pioneered by Vishay Telefunken in its 4000 series. With a split power supply connection, power supply costs are reduced since only the receiver circuit is connected to a regulated power supply, while the high IR current is generated by a less controlled power line or directly from the battery.
Vishay's TFDU4204 provides input and output logic levels adapted to 1.8-V logic. Providing a typical operating distance of 70 cm, the device can function at maximum distances of 70 cm, and has a power consumption of only 70 μA in the receive mode and 0.01 μA in the shutdown mode. Like the TFDU4202, it features a split power supply connection that reduces the current consumption from the controlled supply and draws the emitter current directly from the uncontrolled power supply.
The new additions to Vishay's IrDA-compliant MicroFace transceiver series are excellent choices for low-power IrDA implementations in space-limited applications. The infrared transceivers continue to feature the lowest-profile packaging to date and include the additional benefit of internal current regulation, minimizing the required external circuitry and conserving even more space in the end product design.
Already in use by telecommunications manufacturers worldwide, Vishay's first MicroFace product (TFDU4201) offers many of the same features as the new IrDA-compliant transceivers. Featuring a 30-mA IR peak current during transmission and a typical operating distance between 20 cm and 30 cm, with a maximum distance of 70 cm, the TFDU4201 has been implemented in numerous products requiring low power consumption and compatibility with the IrDA Low Power Standard.
All MicroFace transceivers provide a tri-state output on the RXD pin, allowing several devices-either IrDA transceivers or other components-to share the same communication bus. All devices provide the option to adjust the output intensity through an external resistor, are compatible with the IrDA IrPHY specification version 1.3, and include eye safety features such as limited optical output pulse duration and optical output intensity.
All three new devices are oriented in carrier tape for side view mounting. Samples and production quantities of the integrated low-profile transceiver module family are available now. Lead times for larger orders are 6 to 10 weeks.
Vishay Intertechnology, Inc., a Fortune 1000 Company listed on the NYSE (VSH), is one of the world's largest manufacturers
of discrete semiconductors (diodes, MOSFETs, and infrared optoelectronics) and passive electronic components (resistors, inductors,
and capacitors). These components are used in virtually all types of electronic devices and equipment, in the industrial,
computing, automotive, consumer, telecommunications, military, aerospace, power supplies, and medical markets. Vishay’s product
innovations, successful acquisition strategy, and "one-stop shop" service have made it a global industry leader. Vishay can
be found on the Internet at www.vishay.com.