A complete interface for two LNBs (Low Noise Block), including stand-by function, 22kHz oscillator and selectable voltage outputs
 Geneva, August 24, 2000 - STMicroelectronics (NYSE: STM) today introduced the LNBP10/20 series of monolithic linear voltage regulators, which are specifically designed to supply the powering voltages and interface signals, through the coaxial cable, to a receive antenna's LNB down converter. Serving as a complete interface for two LNBs, the series includes two selectable power outputs, a fast start-up 22kHz oscillator that helps to implement DiSEqCª encoding, and an auxiliary modulation input.
The regulator outputs supply 13V to 18V (typical), which is logic controlled for remote control operation. It is also possible to increment a selected voltage value by 1V (typical) to compensate for voltage drops along the coaxial cable. Output current is 500 mA (minimum). To reduce heat dissipation at the lowest output voltage, one of two supply input pins accepts 16V (minimum), while a second takes 23V (minimum). An internal switch automatically selects the suitable input according to the output voltage.
An internal 22kHz (typical) square-wave oscillator modulates the DC output by [+/-]3V. Factory trimmed within a tolerance of +/-2kHz, the oscillator needs no further adjustments or external components. In addition, because the oscillator has a fast response, the tone can be burst coded to implement DiSEqCª protocols.
To serve the two antenna ports found in most receivers, the output voltage is available at one of two logic-selectable output pins. When the regulator is powered, but in standby mode, both regulator outputs are disabled to allow other satellite receivers sharing the coaxial line to power and control the antenna down converters. In that case, back current through both outputs is limited to no more than 3mA. For slave operation in a one-dish, dual receiver system, the regulator includes an electronic bypass switch that leaves all LNB powering and control functions to the master receiver.
Other features of the LNBP10/20 series include LNB short-circuit and diagnostics, as well as over-temperature protection. The LNBP10/20 series is available in MULTIWATT15™, PowerSO-20™ and PowerSO-10™ packages.
About STMicroelectronics
STMicroelectronics (formerly SGS-THOMSON Microelectronics) is a global independent semiconductor company, whose shares are traded on the New York Stock Exchange, on the ParisBourse and on the Milan Stock Exchange. The Company designs, develops, manufactures and markets a broad range of semiconductor integrated circuits (ICs) and discrete devices used in a wide variety of microelectronic applications, including telecommunications systems, computer systems, consumer products, automotive products and industrial automation and control systems. In 1999, the Company's net revenues were $5.056 billion and net earnings were $547 million. Further information on ST can be found at www.st.com.
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