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LMX1501A Datasheet(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX1501A
Description  PLLatinumTM 1.1 GHz Frequency Synthesizer for RF Personal Communications
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX1501A Datasheet(HTML) 10 Page - National Semiconductor (TI)

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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 6465 or 128129) If the Control Bit (LSB) is LOW the DATA is transferred into the N Counter
(programmable divider)
TLW12340 – 19
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) Serial data
format is shown below
TLW12340 – 20
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
1-BIT PRESCALER SELECT
(S LATCH)
Prescaler
15
S
Select
P
128129
0
6465
1
10


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