DS_S1M8837 Datasheet, PDF (20/29 Pages) Samsung semiconductor – FRACTIONAL-N RF/INTEGER-N IF DUAL PLL

S1M8836/37
FRACTIONAL-N RF/INTEGER-N IF DUAL PLL
Programmable PFD and Charge Pump
IF Charge Pump Gain ( IF_CP_WORD; W2[18] )
Control Words Control bits
IF_CP_WORD
W2[18]
Acronym
IF_CP_GAIN
LOW (0)
1x (100µA)
HIGH (1) Comments
8x (800µA) IF charge pump
RF Charge Pump Gain ( RF_CP_WORD; W3[17:14] )
Control Words Control bits
RF_CP_WORD W3[17:14]
Acronym
RF_CP_LVL
LOW (0)
HIGH (1)
select 16-level charge pump current
Comments
RF charge pump
Icpo (µA)
50
100
•
200
250
•
400
450
•
800
8X
W3[17]
0
0
•
0
0
•
0
1
•
1
4X
W3[16]
0
0
•
0
1
•
1
0
•
1
2X
W3[15]
0
0
•
1
0
•
1
0
•
1
Phase Detector Polarity ( RF_CP_WORD/IF_CP_WORD; W3[13]/W2[17] )
Depending on VCO characteristics, W2[17] and W3[13] bits should be set as follows :
Control bits
W2[17]
W3[13]
LOW (0)
Negative Slope
Negative Slope
HIGH (1)
Positive Slope
Positive Slope
1X
W3[14]
0
1
•
1
0
•
1
0
•
1
Comments
IF PFD
RF PFD
20