User's Manual

13
Input and Output Voltage Level Descriptions
Transmit Power
The module is able to adjust transmit power from 29.5 dBm to10.5 dBm,
configurable in 1 dB steps with an accuracy (the measure of the power output for
each level) of +/-0.5 dB. The initial tolerance (the measure of the power output for
each level) is +/-0.5 dB. The output power is set on each of the antennas. Output
power tolerance from the nominal setting is +/- 0.75 dB over an ambient
temperature range of -20 °C to 60 °C.
The module supports PR-ASK modulation for EPC Class 1 Gen 2 tags only.
RF Integration
The module supports two antenna connections. You can use software
to
control the selection of either connection. The module switches from one
antenna to the other in 5 ms or less. The switching time is defined from the 90%
power point as the RF is turned off at the first port to the 90% power point as the
RF is turned on at the second port.
The module uses an integrated RFID transceiver. It features autotuning on
the antenna ports to match the antenna return loss
dynamically. The system
compensates for antennas with a VSWR of 2.0
or lower (a VSWR of <1.7 is
optimum).
There are no termination requirements for the antenna ports. The module will not
transmit to any open antenna ports