CC2430-RTR1-F64 datasheet(184/234 Pages) TI

184 / 234 page

CC2430

CC2430 PRELIMINARY Data Sheet (rev. 1.03) SWRS036A

Page 184 of 232

14.29 Input / Output Matching

The RF input / output is differential (RF_N

and RF_P). In addition there is supply

switch output pin (TXRX_SWITCH) that

must have an external DC path to RF_N

and RF_P.

In RX mode the TXRX_SWITCH pin is at

ground and will bias the LNA. In TX mode

the TXRX_SWITCH pin is at supply rail

voltage and will properly bias the internal

PA.

The RF output and DC bias can be done

using different topologies. Some are

shown in Figure 6 on page 30.

Component values are given in Table 24

on page 31. If a differential antenna is

implemented, no balun is required.

If a single ended output is required (for a

single ended connector or a single ended

antenna), a balun should be used for

optimum performance.

14.30 Transmitter Test Modes

CC2430 can be set into different transmit

test modes for performance evaluation.

The test mode descriptions in the following

sections requires that the chip is first reset,

the crystal oscillator is selected using the

CLKCON register and that the crystal

oscillator has stabilized.

14.30.1 Unmodulated carrier

unmodulated

carrier

may

transmitted

setting

MDMCTRL1L.TX_MODE

writing

0x1800

the

DACTSTH:DACTSTL

registers and issue a STXON command

strobe. The transmitter is then enabled

while the transmitter I/Q DACs are

overridden to static values. An un-

modulated carrier will then be available on

the RF output pins.

A plot of the single carrier output spectrum

from

CC2430 is shown in Figure 54 below.

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