lmx2502lq1635 National Semiconductor Corporation, lmx2502lq1635 Datasheet - Page 14

• Manufacturer Part Number: lmx2502lq1635
• Description: Pllatinum? Frequency Synthesizer System With Integrated Vco
• Manufacturer: National Semiconductor Corporation

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Programming Description
R2 REGISTER
The R2 Register address bits (R2 [1:0]) are “10”.
The IF_CUR [1:0] bits program the IF charge-pump current. Considering the external IF VCO and loop filter, the user can select
the amount of IF charge pump current to be 100 µA, 200 µA, 300 µA or 800 µA.
R2
(Default)
MSB
23
IF_
CUR[1:0]
22
Name
IF_CUR [1:0]
21
0
20
0
19
1
18
0
17
0
(Continued)
16
1
SHIFT REGISTER BIT LOCATION
15
1
R2 REGISTER
Data Field
14
1
14
13
0
12
1
11
1
Functions
IF Charge Pump Current
00 = 100 µA
01 = 200 µA
10 = 300 µA
11 = 800 µA
10
0
9
1
8
0
7
1
6
0
5
0
4
0
3
1
2
0
1
1
Address
Field
LSB
0
0