LMX2335L National Semiconductor Corporation, LMX2335L Datasheet - Page 14

• Manufacturer Part Number: LMX2335L
• Description: Pllatinum? Low Power Dual Frequency Synthesizer For Rf Personal Communications
• Manufacturer: National Semiconductor Corporation

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Functional Description
Note 8: Refer to POWERDOWN OPERATION in Functional Description.
Note 9: The I
Note 10: PHASE DETECTOR POLARITY
0
1
Depending upon VCO characteristics, the R16 bits should be set accordingly:
When VCO characteristics are positive like (1), R16 should be set HIGH;
When VCO characteristics are negative like (2), R16 should be set LOW.
CPo
Polarity (Note 10)
Phase Detector
LOW current state = 1/4 x I
Negative
Positive
C1
0
0
C2
0
1
CPo
Detector Polarity
Detector Polarity
Normal Operation
C1
RF2 Phase
RF1 Phase
1
1
HIGH current.
D
(Continued)
o
TRI-STATE
R16
(Note 8)
TRI-STATE
TABLE 2. Mode Select Truth Table
TABLE 1. Programmable Modes
C2
0
1
VCO Characteristics
RF2 I
RF1 I
R17
14
Prescaler
Prescaler
(Note 9)
CPo
CPo
HIGH
LOW
I
RF2
RF1
CPo
N19
TRI-STATE
TRI-STATE
RF2 D
RF1 D
01280708
R18
Prescaler
o
o
128/129
64/65
RF1
Pwdn
Pwdn
N20
RF2
RF1
RF2 LD
RF1 LD
R19
Prescaler
128/129
RF2 F
RF1 F
64/65
RF2
R20
o
o
(Note 8)
pwrd up
pwrd dn
Pwdn