CC2430
Radio : Output Power Programming
14.27.1 VCO
The VCO is completely integrated and
operates at 4800 – 4966 MHz. The VCO
frequencies in the desired band (2400-2483.5
MHz).
frequency is divided by
2
to generate
14.27.2 PLL self-calibration
The VCO's characteristics will vary with
temperature, changes in supply voltages, and
the desired operating frequency.
mode or TX mode is enabled, i.e. in the
RX_CALIBRATE,
TX_CALIBRATE
and
TX_ACK_CALIBRATE control states in Figure
46 on page 167.
In order to ensure reliable operation the VCO’s
bias current and tuning range are
automatically calibrated every time the RX
14.28 Output Power Programming
The RF output power of the device is
programmable and is controlled by the
TXCTRLL RF register. Table 45 shows the
output power for different settings, including
the complete programming of the TXCTRLL
register and the current consumption in the
whole device.
For optimum link quality it is recommended to
set TXCTRLLto 0x5F.
Table 45: Output power settings
Output Power
[dBm]
Device current
consumption [mA]
TXCTRLLregister
value
0xFF
0xDF
0xBF
0x9F
0x7F
0x5F
0x3F
0x1F
0x1B
0x17
0x13
0x0F
0x0B
0x07
0x06
0x03
0.6
32.4
31.3
30.3
29.2
28.1
26.9
25.7
24.5
23.6
22.8
21.9
21.0
20.1
19.2
18.8
18.3
0.5
0.3
0.2
-0.1
-0.4
-0.9
-1.5
-2.7
-4.0
-5.7
-7.9
-10.8
-15.4
-18.6
-25.2
14.29 Input / Output Matching
The RF output and DC bias can be done using
different topologies. Some are shown in Figure
6 on page 28.
The RF input / output is differential (RF_Nand
RF_P). In addition there is supply switch output
pin (TXRX_SWITCH) that must have an
external DC path to RF_Nand RF_P.
Component values are given in Table 23 on
page 29. If
implemented, no balun is required.
a
differential antenna is
In RX mode the TXRX_SWITCH pin is at
ground and will bias the LNA. In TX mode the
TXRX_SWITCHpin is at supply rail voltage and
will properly bias the internal PA.
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.
CC2430 Data Sheet (rev. 2.1) SWRS036F
Page 170 of 211
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