1. Write the correct value for the selected channel to Sub-Register 0x28:0C– RF_TXCTRL, e.g. 0x045CA0
for channel 2.
2. Write an appropriate value for TX_POWER to Register file: 0x1E – Transmit Power Control, e.g. for
channel 2 at 16 MHz PRF, write 0x75757575. See Table 20.
3. Write the value for the selected channel to Sub-Register 0x2B:07 – FS_PLLCFG, e.g. 0x08400508 for
channel 2, see Table 43: Sub-Register 0x2B:07 – FS_PLLCFG values.
4. Write the correct value for the selected channel to Sub-Register 0x2B:0B – FS_PLLTUNE, e.g. 0x26 for
channel 2.
5. Write the correct value for the selected channel to TC_PGDELAY, see Sub-Register 0x2A:0B –
TC_PGDELAY, e.g. 0xC2 for channel 2.
6. Write 0x05FFF00 to
7. Sub-Register 0x28:00 – RF_CONF
8. Write appropriate values to Register file: 0x1F – Channel Control, e.g. for channel 2, PRF 16 MHz and
preamble code 3, write 0x18C40022.
9. Write transmit data to the transmit buffer, see Register file: 0x09 – Transmit Data Buffer, e.g.
0x000000000000000000000000C2DEC1DE.
10. Write appropriate values to Register file: 0x08 – Transmit Frame Control, e.g. for frame length 16
bytes, 850 kbps data rate, 16 MHz PRF and 256 symbol preamble, write 0x25A010.
The spectrum analyser should be set up as follows:
Resolution Bandwidth = 1 MHz
Video Bandwidth = 1 MHz
Span = 2 GHz
Sweep time = 2 seconds
Detector = rms
Average time per point (on spectrum analyser scan) ≤ 1 ms
In order to easily view the transmit spectrum the device is set into Transmit Power Spectrum Test Mode by
setting the TX_PSTM field of Sub-Register 0x2F:24 – Digital Diagnostics Test Mode Control. A suitable value
for the repeat frame interval must be set in DX_TIME register, the minimum value is 4. For a repeat interval
of 1 ms, a value of 0x0001E780 may be written to DX_TIME, see Sub-Register 0x2F:24 – Digital Diagnostics
Test Mode Control TX_PSTM field description for details. For Manual Transmit Power Control testing this
setting should be configured to send frames continuously and so a value equal to the frame duration must
be set in DX_TIME.
When the test configuration has been completed, the transmitter may be initiated by setting the TXSTRT
field in the SYS_CTRL register, see Register file: 0x0D – System Control Register.
TX_POWER should be set for the selected channel as a starting point, see Register file: 0x1E – Transmit
Power Control. The TX_POWER setting should then be adjusted until the transmit level is just below the
required spectral density limit (usually -41.3dBm/MHz). This register value should then be stored in the OTP
memory, see section 6.3.2 – Programming a value into OTP memory for details of how to program OTP
memory and recommended memory locations.
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