1.2
Reference Clock
1.3
Communications
1.4
Transmitter
www.ti.com
EVM Circuit Overview
The TRF2443 EVM allows for either an external reference chosen by the user or an internal oscillator at
20 MHz provided on the EVM board. If an external reference is to be used the signal should be fed into
SMA connector J3 (EXTREF) and jumpers W1 and W12 should be removed (see
Figure 4
).
Figure 4. EVM Reference Clock J3 and USB Port J5
The EVM is equipped with USB communications which provide the interface between a computer's USB
port and the TRF2443s SPI port via J5 as shown in
Figure 4
. A CD containing the GUI to control the
TRF2443 is provided within the EVM kit. An overview of the GUI is provided in this document
The EVM is configured for differential I/Q input signals via four SMA connectors. For the upper sideband,
the I signals are connected to J12 (TXBBIP) and J17 (TXBBIN). The Q signals are connected to J23
(TXBBQN) and J20 (TXBBQP) (see
Figure 5
). SMA connector J6 (TXOUT), not shown below, is used to
monitor the RF output signal from the transmitter.
SLWU065 – September 2009
List of Tables
5
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