A design for a phantom antenna power-supply system compatible with the Digital Satellite Equipment Control (DiSEqC) communication standard, using the MAX16948 automotive dual, high-voltage LDO/switch. The presented application circuit provides a remote antenna power supply and also enables one-way communic
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ation from the radio head unit to the remote antenna. This system architecture offers flexibility in DiSEqC tone-burst frequency choice (100Hz to 30kHz), enabling users the ability to select the best frequency for their application. The MAX16948 is an automotive dual high-voltage, low dropout linear regulator (LDO)/switch with output current sensing. The device provides phantom power over the coax cable to remote radio frequency (RF) low-noise amplifiers (LNAs) in automotive systems with a maximum current of 300mA per channel. The device provides a fixed regulated output voltage of 8. 5V or an adjustable 1V to 12V regulated output voltage (LDO mode). The Digital Satellite Equipment Control (DiSEqC) standard is a communication protocol developed by Eutelsat used between satellite receiver (decoder), defined as master, and satellite peripheral equipment such as dish switchers, low-noise blocks (LNBs) and dish positioners, defined as slaves. The DiSEqC communication system uses only the existing coaxial cable, thus making DiSEqC ideal to reduce cost and improve reliability. The DiSEqC is an open standard with nonproprietary commands. To allow one-way DiSEqC communication on the phantom antenna cable, a 22kHz tone-burst must be transmitted from the radio head unit and received by the remote antenna. The voltage amplitude of this tone-burst is 650mV, which is the value indicated by the DiSEqC standard. Note that the phantom...
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