參數(shù)資料
型號(hào)： LMX2315MDA
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： PLL合成/DDS/VCOs
英文描述： PLL FREQUENCY SYNTHESIZER, 1200 MHz, UUC
封裝： DIE
文件頁(yè)數(shù)： 2/25頁(yè)
文件大?。?/td> 452K
代理商： LMX2315MDA
Functional Description
The simplified block diagram below shows the 19-bit data register the 14-bit R Counter and the S Latch and the 18-bit
N Counter (intermediate latches are not shown) The data stream is clocked (on the rising edge) into the DATA input MSB first
If the Control Bit (last bit input) is HIGH the DATA is transferred into the R Counter (programmable reference divider) and the
S Latch (prescaler select LMX2315 and LMX2320 6465 or 128129 LMX2325 3233 or 6465) If the Control Bit (LSB) is
LOW the DATA is transferred into the N Counter (programmable divider)
TLW12339 – 18
PROGRAMMABLE REFERENCE DIVIDER (R COUNTER) AND PRESCALER SELECT (S LATCH)
If the Control Bit (last bit shifted into the Data Register) is HIGH data is transferred from the 19-bit shift register into a 14-bit
latch (which sets the 14-bit R Counter) and the 1-bit S Latch (S15 which sets the prescaler 6465 or 128129 for the
LMX231520 or 3233 or 6465 for the LMX2325) Serial data format is shown below
TLW12339 – 6
14-BIT PROGRAMMABLE REFERENCE DIVIDER RATIO
(R COUNTER)
Divide
14
S
13
S
12
S
11
S
10
SS
9
S
8
S
7
S
6
S
5
S
4
S
3
S
2
S
1
Ratio
R
3
0
0000
0 0 0 000011
4
0
0000
0 0 0 000100
16383
1
1111
1 1 1 111111
Notes
Divide ratios less than 3 are prohibited
Divide ratio 3 to 16383
S1 to S14 These bits select the divide ratio of the programmable
reference divider
C Control bit (set to HIGH level to load R counter and S Latch)
Data is shifted in MSB first
Prescaler Select
15
S
LMX231520
LMX2325
128129
6465
0
6465
3233
1
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PDF描述
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