Manual

RF22
Version: 0.1 Date: 12/23/2008
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80
3 cdconly Charge Pump DC Offset Only.
2:0 cdcurr[2:0] Charge Pump DC Current Selection.
Register 58h. Charge Pump Current Trimming/Override
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name cpcurr[1:0] cpcorrov
cporr[4:0]
Type R/W R/W R/W
Reset value = 100xxxxx
Bit Name Function
7:6 cpcurr[1:0] Charge Pump Current (Gain Setting).
Changing these bits will change the BW of the PLL. The default setting is adequate for all data
rates.
5 cpcorrov Charge Pump Correction Override Enable.
4:0 cpcorr[4:0] Charge Pump Correction Value.
Register 59h. Divider Current Trimming/Delta-Sigma Test
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name txcorboosten fbdivhc d3trim[1:0] d2trim[1:0] d1p5trim[1:0]
Type R/W R/W R/W R/W R/W
Reset value = 10000000
Bit Name Function
7 txcorboosten If this is Set, then vcocorr (reg 5A[5:2]) = 1111 during TX Mode and VCO CAL followed by
TX.
6 fbdivhc Feedback (fractional) Divider High Current Enable (+5 uA).
5:4 d3trim[1:0] Divider 3 Current Trim Value.
3:2 d2trim[1:0] Divider 2 Current Trim Value.
1:0 d1p5trim[1:0] Divider 1.5 (div-by-1.5) Current Trim Value.
Register 5Ah. VCO Current Trimming
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name txcurboosten vcocorrov
vcocorr[3:0]
vcocur[1:0]
Type R/W R/W R/W R/W
Reset value = 10000011
Bit Name Function
7 txcurboosten If this is Set, then vcocur = 11 during TX Mode and VCO CAL followed by TX.
6 vcocorrov VCO Current Correction Override.
5:2 vcocorr[3:0] VCO Current Correction Value.
1:0 vcocur[1:0] VCO Current Trim Value.
Register 5Bh. VCO Calibration/Override
Bit D7 D6 D5 D4 D3 D2 D1 D0
Name vcocalov/vcdone vcocal[6:0]
Type R/W R/W
Reset value = 00000000
Bit Name Function
7 vcocalov/ vcdone VCO Calibration Override/Done.
When vcocalov = 0 the internal VCO calibration results may be viewed by reading the vcocal
register. When vcocalov = 1 the VCO results may be overridden externally through the SPI by
writing to the vcocal register. Reading this bit gives 1 if the calibration process has been
finished.