RK-900-FDTC Radiotronix, RK-900-FDTC Datasheet - Page 10

• Manufacturer Part Number: RK-900-FDTC
• Description: RF Modules & Development Tools Rapid Developmnt Kit
• Manufacturer: Radiotronix

Specifications of RK-900-FDTC

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Applications Information
Figure 5 shows the schematic diagram of our
evaluation board. All of the transceiver parameters in
the specification sheet were determined on this board.
Power Supply
The transceiver is designed to operate from a 3V DC
power supply. Power is provided to the transceiver on
pin 16. This power supply should be noise-free. Noise
on the power supply will degrade the receiver
sensitivity, thereby decreasing range.
Ground
It is important to have a good ground system for any
wireless design. The ground plane serves as a base
reference for the operation of RF circuitry. All filters
are referenced to ground. All oscillators are referenced
to ground.
If the ground system design is bad, RF circuitry may
not function correctly. The results may be reduced
performance or spurious emissions.
As a rule of thumb, it is best to use a solid fill ground
plane to connect all of the ground pins of the
transceiver.
Transmitter Start-Up Time
The start-up time for the transmitter is determined
mainly by the loop bandwidth of the PLL loop filter.
When the transmitter is enabled by setting the TXE bit
in the mode register to a 1, it can take up to 20mSec
for the transmitter to be on-channel and ready to
transmit information.
Transmitter Channel-Change Time
The channel change time for the transmitter is the time
it takes for the transmitter to be locked onto the new
channel after programming the TX channel register.
EWM-900-FDTC
10
Rev Date 7/25/01
For a 1MHz jump, the channel change time is 11mSec.
For a 100kHz jump, the channel change time is 7 mSec.
Transmitter Audio/Data Input Requirements
The TXD/AUDIN pin is connected to the transmit VCO.
Voltage changes on this pin will frequency modulate
the VCO.
A 3V p-p signal present at this pin will result in a +/-
25kHz frequency deviation.
There is a 150 hz high-pass response on this pin due
to the TX PLL loop filter. Therefore, the transmitter is
not capable of transmitting DC voltage levels. The
bandwidth of the signal used to modulate the
transmitter should be between 300 hz and 15kHz.
For data applications, the baud rate should be between
9600 bps and 19.2kbps.
Receiver Start-Up Time
Like the transmitter, the receiver start-up time is
determined by the loop bandwidth of the PLL loop filter.
When the receiver is enabled by setting the RXE bit in
the mode register to a 1, it can take up to 20mSec for
the receiver to be on-channel and ready to receive
information.
Receiver Channel-Change Time
The channel change time for the receiver is the time it
takes for the receiver to be locked onto the new channel
after programming the RX channel register.
For a 1MHz jump, the channel change time is 7mSec.
For a 100kHz jump, the channel change time is 5 mSec.
Preliminary