ZHCSP40B October 2021 – June 2022 LMX2571-EP
PRODUCTION DATA
15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
0 | 0 | 0 | 0 | EXTVCO_CP_IUP | EXTVCO_CP_GAIN | CP_IDN | |||||||||
R/W-0h | R/W-10h | R/W-0h | R/W-10h |
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset |
BIT | FIELD | TYPE | RESET | DESCRIPTION |
---|---|---|---|---|
15-12 | R/W | 0h | Program 0h to this field. | |
11-7 | EXTVCO_CP_IUP | R/W | 10h | Set the base charge pump current for external VCO in PLL mode operation. The total base charge pump current is equal to EXTVCO_CP_IDN + EXTVCO_CP_IUP. EXTVCO_CP_IDN must be equal to EXTVCO_CP_IUP. Only even number values are supported. |
6-5 | EXTVCO_CP_GAIN | R/W | 0h | Set the multiplication factor to the base charge pump current for external VCO in PLL mode operation. For example, if the gain here is 2x and if the total base charge pump current (EXTVCO_CP_IDN + EXTVCO_CP_IUP) is 2.5 mA, then the final charge pump current applied to the loop filter is 5 mA. The gain values are not precise. They are provided as a quick way to boost the total charge pump current for debug purposes or specific applications. |
4-0 | CP_IDN | R/W | 10h | Set the base charge pump current for internal VCO in synthesizer mode operation. The total base charge pump current is equal to CP_IDN + CP_IUP. CP_IDN must be equal to CP_IUP. |