參數(shù)資料
型號: LMX2502
廠商: National Semiconductor Corporation
英文描述: PLLatinum⑩ Frequency Synthesizer System with Integrated VCO
中文描述: PLLatinum⑩頻率合成系統(tǒng)的集成VCO
文件頁數(shù): 16/18頁
文件大?。?/td> 184K
代理商: LMX2502
Programming Description
(Continued)
R4 REGISTER
The R4 register address bits (R3 [3:0]) are “0111”.
Register R4 is used to set the IF N counters if the default value is not desired. This register is only active if the SPI_DEF bit in
register R0 is 0.
R4 REGISTER
R
MSB
23
SHIFT REGISTER BIT LOCATION
16
15
14
13
Data Field
LSB
0
22
21
20
19
18
17
12
11
10
9
8
7
6
5
4
3
2
Address
Field
1
1
1
R4
0
0
0
1
0
0
0
IF_A
[3:0]
IF_B
[8:0]
0
1
Name
IF_A [3:0]
Functions
IF A Counter
4-bit swallow counter
0
IF_A
15
IF B Counter
9-bit programmable counter
1
IF_B
511
IF_B [8:0]
IF Frequency Setting:
f
VCO
= {16 x IF_B + IF_A} x f
OSC
/ IF_R where (IF_A
<
IF_B)
where
f
VCO
: Output frequency of IF voltage controlled oscillator (IF VCO)
IF_B: Preset divide ratio of binary 9-bit programmable counter (1
IF_B
511)
IF_A: Preset divide ratio of binary 4-bit swallow counter (0
IF_A
15)
IF_R: Preset divide ratio of binary 9-bit programmable reference counter (2
IF_R
511)
f
OSC
: Reference oscillator frequency
L
www.national.com
16
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PDF描述
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相關代理商/技術參數(shù)
參數(shù)描述
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