SNAS764 May 2018 LMX2572LP
PRODUCTION DATA.
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
0 | 0 | 0 | 0 | RAMP_THRESH[32] | 0 | QUICK_RECAL_EN | VCO_CAPCTRL_STRT | 1 | |||||||
R/W-0h | R/W-0h | R/W-0h | R/W-0h | R/W-32h | R/W-0h |
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
15 - 12 | R/W | 0h | Program 0h to this field. | |
11 | RAMP_THRESH[32] | R/W | 0h | The 33rd bit of RAMP_THRESH.
RAMP_THRESH sets how much the ramp can change the VCO frequency before a VCO calibration is required. If the frequency is chosen to be Δf, then RAMP_THRESH = (Δf / fPD) × 224. |
10 | R/W | 0h | Program 0h to this field. | |
9 | QUICK_RECAL_EN | R/W | 0h | This sets the initial VCO starting calibration values. Especially useful if the frequency change is smaller, say < 50 MHz or so.
0: Calibration starts with VCO_SEL, VCO_CAPCTRL_START, VCO_DACISET_START 1: Calibration starts with the current value |
8 - 1 | VCO_CAPCTRL_STRT | R/W | 32h | This sets the starting VCO_CAPCTRL value that is used for VCO frequency calibration. Smaller values yield a higher frequency band within a VCO core. Valid number range is 0 to 183. |
0 | R/W | 0h | Program 1h to this field. |