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Wavenet Technology BM3-800D User Manual
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Installation________________________________________________ Boomer-III User Manual & Integrator’s GuideCopyright Wavenet Technology © October 2003 44 BM310012WT04Supplying PowerThe Boomer-III OEM Modem must be provided with a clean powersource capable of delivering bursts of high current.The modem draws its power in bursts. The power required changesrapidly depending on whether the modem is transmitting, receiving oron standby.RatingsThe power supply requirements are:Voltage: 3.8V (3.4 to 4.8V range)Transmit Current: 1.6A maximum(2.2A maximum if antenna mismatched)Transmit Duration: 32ms (minimum)7s (maximum)Duty Cycle 30% (maximum) data dependantReceive Current TBD mA (typical)Standby Current TBD mA (typical)Add ~1.2mA if LED’s enabledOff current consumption: TBD μA (nominal)Power Supply Ripple: < 15mV peak to peakDesign ConsiderationsThe power supply is one of the key issues of design of wirelessterminals.Due to the burst nature of transmit periods the power supply must beable to deliver high current peaks for short periods of 32ms to amaximum of 7 seconds (RD-LAP 9600 bps) or for 20 seconds (MDC4800 bps). During this time the drop in the supply at the module itselfmust not exceed 200mV (total at the module), such that at no timemodule shall module supply drop below 3.4V and ripple must notexceed 15mVp-p during transmit.The maximum transmit current into a matched antenna is 1.6A,however, this can increase if antenna mismatch occurs.Wavenet recommends designing a robust power supply that canprovide adequate power under non-ideal conditions such as animproperly matched antenna, where current can be up to 2.2A. |
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