CC2430 Datasheet, PDF (170/212 Pages) Texas Instruments – A True System-on-Chip solution for 2.4 GHz IEEE 802.15.4 / ZigBee-TM

CC2430
Radio : Output Power Programming
14.27.1 VCO
The VCO is completely integrated and
operates at 4800 – 4966 MHz. The VCO
frequency is divided by 2 to generate
frequencies in the desired band (2400-2483.5
MHz).
14.27.2 PLL self-calibration
The VCO's characteristics will vary with
temperature, changes in supply voltages, and
the desired operating frequency.
In order to ensure reliable operation the VCO’s
bias current and tuning range are
automatically calibrated every time the RX
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.
14.28 Output Power Programming
The RF output power of the device is
register and the current consumption in the
programmable and is controlled by the
whole device.
TXCTRLL RF register. Table 45 shows the
output power for different settings, including
the complete programming of the TXCTRLL
For optimum link quality it is recommended to
set TXCTRLL to 0x5F.
Table 45: Output power settings
Output Power
[dBm]
0.6
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
TXCTRLL register
value
0xFF
0xDF
0xBF
0x9F
0x7F
0x5F
0x3F
0x1F
0x1B
0x17
0x13
0x0F
0x0B
0x07
0x06
0x03
Device current
consumption [mA]
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
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 28.
Component values are given in Table 23 on
page 29. 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.
CC2430 Data Sheet (rev. 2.1) SWRS036F
Page 170 of 211