LMX2331UEVAL National Semiconductor, LMX2331UEVAL Datasheet - Page 42

• Manufacturer Part Number: LMX2331UEVAL
• Manufacturer: National Semiconductor

Specifications of LMX2331UEVAL

• Lead Free Status / Rohs Status: Not Compliant

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Reg. Most Significant Bit
IF
R
2.0 Programming Description
2.4 IF R REGISTER
The IF R register contains the IF R_CNTR, PD_POL IF, ID
compose the F
following sections. IF R_CNTR[14:0]
2.4.1 IF R_CNTR[14:0] IF Synthesizer Programmable Reference Divider (R Counter)
The IF reference divider (IF R_CNTR) can be programmed to support divide ratios from 3 to 32767. Divide ratios less than 3 are
prohibited.
2.4.2 PD_POL IF
The PD_POL IF bit is used to control the IF synthesizer’s phase detector polarity based on the VCO tuning characteristics.
2.4.3 ID
The ID
Divide Ratio
F o LD0 F o LD2
21
Control Bit
PD_POL IF
Control Bit
32767
o
ID
o
3
4
•
IF bit controls the IF synthesizer’s charge pump gain. Two current levels are available.
o
IF
20
IF
STATE
o
LD control word. The detailed descriptions and programming information for each control word is discussed in the
TRI-
ID o
19
IF
18
ID o
IF
14
0
0
1
•
IF Synthesizer Phase Detector Polarity
PD_
POL
Register Location
Register Location
17
IF Synthesizer Charge Pump Current Gain
IF
13
0
0
1
•
IF R[17]
IF R[18]
16
12
0
0
1
•
15
14
11
0
0
1
•
13
IF VCO Characteristics
SHIFT REGISTER BIT LOCATION
(Continued)
10
IF Phase Detector
Polarity
IF Charge Pump
Current Gain
0
0
1
•
Data Field
12
Description
Description
o
9
0
0
1
•
IF, and TRI-STATE ID
11
42
IF R_CNTR[14:0]
IF R_CNTR[14:0]
8
0
0
1
•
10
9
7
0
0
1
•
IF VCO Negative
Tuning
Characteristics
8
10136609
6
0
0
1
o
•
IF control words, in addition to two bits that
0.95 mA
7
LOW
5
0
0
1
•
0
0
6
4
0
0
1
•
5
Function
Function
IF R[2:16]
4
3
0
0
1
•
IF VCO Positive
Tuning
Characteristics
IF R[17]
Least Significant Bit
3
IF R[18]
2
0
1
1
•
3.80 mA
HIGH
2
1
1
1
1
0
1
•
Address
1
0
Field
0
1
0
1
•
0
0