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LMX2330A Datasheet(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2330A
Description  PLLatinum??Dual 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)

LMX2330A Datasheet(HTML) 10 Page - National Semiconductor (TI)

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Functional Description
The simplified block diagram below shows the 22-bit data register, two 15-bit R Counters and the 15- and 18-bit N Counters (in-
termediate latches are not shown). The data stream is clocked (on the rising edge of Clock) into the DATA register, MSB first. The
data stored in the shift register is loaded into one of 4 appropriate latches on the rising edge of LE. The last two bits are the Con-
trol Bits. The DATA is transferred into the counters as follows:
Control Bits
DATA Location
C1
C2
0
0
IF R Counter
0
1
RF R Counter
1
0
IF N Counter
1
1
RF N Counter
PROGRAMMABLE REFERENCE DIVIDERS (IF AND RF R COUNTERS)
If the Control Bits are 00 or 01 (00 for IF and 01 for RF) data is transferred from the 22-bit shift register into a latch which sets
the 15-bit R Counter. Serial data format is shown below.
15-BIT PROGRAMMABLE REFERENCE DIVIDER RATIO (R COUNTER)
Divide
Ratio
R
15
R
14
R
13
R
12
R
11
R
10
R
9
R
8
R
7
R
6
R
5
R
4
R
3
R
2
R
1
3
0000000
00000011
4
0000000
00000100
•••••••
••••••••
32767
1111111
11111111
Notes:
Divide ratios less than 3 are prohibited.
Divide ratio: 3 to 32767
R1 to R15: These bits select the divide ratio of the programmable reference divider.
Data is shifted in MSB first.
DS012331-1
DS012331-14
www.national.com
10


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