0600-00027 Laird Technologies, 0600-00027 Datasheet - Page 43

• Manufacturer Part Number: 0600-00027
• Description: ANTENNA 915MHZ 1/2WV 7" RPSMA
• Manufacturer: Laird Technologies

Specifications of 0600-00027

• Antenna Type: Whip: 1/2 Wave, Swivel, Tilt (Right Angle)
• Number Of Bands: 1
• Frequency: 902MHz ~ 928MHz
• Vswr: 2
• Gain: 2dBi
• Termination: RP-SMA
• Mounting Type: Connector
• Height (max): 8.25" (209.5mm)
• Impedance: 50 Ohms
• Technology Type: 1/2 Wave Wireless Transceiver Antenna
• Termination Style: RPSMA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Appendix II – Converting from 5V to 3.3V
Appendix II – Converting from 5V
levels to 3.3V levels
Converting from 5V to 3.3V
The AC4790-1000M and the AC4790-1x1 have 3.3 V input levels. However, this can cause problems if a designer wants
to use an older 5V circuit in the same design. Some of the most common voltage conversion methods are described
below.
1. Voltage Level Conversion IC’s
This is the easiest and most efficient method. Aerocomm recommends the TI SN74LVC244A Octal Buffer/Driver. Inputs
can be driven from either 3.3 or 5V systems, allowing the device to be used in a mixed 3.3/5V system.
The datasheet for the SN74LVC244A can be downloaded from TI’s website,
http://focus.ti.com/docs/prod/folders/print/sn74lvc244a.html
All inputs are weakly pulled high and are equipped with a 10 kΩ pullup resistor. Aerocomm recommends that all unused
inputs be pulled high.
2. Passive Voltage Divider
While a resistor voltage divider can successfully drop the 5V to the required 3.3V, it will draw static current all of the time.
Typically this method is only suitable for one-way 5V to 3.3V conversion. When choosing the resistor values, one should
remember to include the radio’s internal 10 kΩ resistor on the input signals.
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