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參數(shù)資料
| 型號： | LMX2512LQX0967/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 19.68 MHz, QCC28 |
| 封裝： | 5 X 5 MM, 0.75 MM HEIGHT, LLP-28 |
| 文件頁數(shù)： | 8/18頁 |
| 文件大?。?/td> | 184K |
| 代理商： | LMX2512LQX0967/NOPB |
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
Register
MSB
SHIFT REGISTER BIT LOCATION
LSB
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9876543210
Data Field
Address
Field
R4
0
001000
IF_A
[3:0]
IF_B
[8:0]
0111
Name
Functions
IF_A [3:0]
IF A Counter
4-bit swallow counter
0
≤ IF_A ≤ 15
IF_B [8:0]
IF B Counter
9-bit programmable counter
1
≤ IF_B ≤ 511
IF Frequency Setting:
f
VCO = {16 x IF_B + IF_A} x fOSC / 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
LMX2502/LMX2512
www.national.com
16
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