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LMX2306 Datasheet(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2306
Description  PLLatinum??Low Power 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)

LMX2306 Datasheet(HTML) 7 Page - National Semiconductor (TI)

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1.0 Functional Description
The simplified block diagram below shows the 21-bit data register, a 14-bit R Counter, an 18-bit N Counter, and a 18-bit Function
Latch (intermediate latches are not shown). The data stream is shifted (on the rising edge of LE) into the DATA input, MSB first.
The last two bits are the Control Bits. The DATA is transferred into the counters as follows:
Control
DATA Location
C1
C2
0
0
R Counter
1
0
N Counter
0
1
Function Latch
1
1
Initialization
1.1 PROGRAMMABLEREFERENCE DIVIDER
If the Control Bits are [C
1,C2] = [0,0], data is transferred from the 21-bit shift register into a latch that sets the 14-bit R Counter.
The 4 bits R15–R18 are for test modes, and should be set to 0 for normal use. The LD precision bit, R19, is described in the
LOCK DETECT OUTPUT CHARACTERISTICS section. Serial data format is shown below.
1.1.1 14-BIT PROGRAMMABLE REFERENCE DIVIDER RATIO (R COUNTER)
Divide
RRRRR
RRRRRRRRR
Ratio
14
13
12
11
10
987654321
3
00000
000000011
4
00000
000000100
•••••
•••••••••
16383
11111
111111111
Notes: Divide ratios less than 3 are prohibited.
Divide ratio: 3 to 16383
R1 to R14: These bits select the divide ratio of the programmable reference divider.
DS100127-4
DS100127-5
Note: R15 to R18 are test modes and should be zero for normal operation.
Data is shifted in MSB first.
www.national.com
7


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