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LMX2301 Datasheet(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2301
Description  PLLatinumTM 160 MHz Frequency Synthesizer for RF Personal Communications
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LMX2301 Datasheet(HTML) 7 Page - National Semiconductor (TI)

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Functional Description (Continued)
PROGRAMMABLE DIVIDER (N COUNTER)
The N counter consists of the 11-bit programmable counter If the Control Bit (last bit shifted into the Data Register) is LOW
data is transferred from the 19-bit shift register into an 11-bit latch which sets the 11-bit programmable Counter Serial data
format is shown below
TLW12458 – 15
Note
R8 to R18 Programmable counter divide ratio control bits (3 to 2047)
7 LSB BITS OF N REGISTER
Divide
N
N
N
N
N
N
N
Ratio
7
6
5
4
3
2
1
X
X
XXXXXX
Note
X e Don’t care state
11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO
Divide
18
N
17
N
16
N
15
N
14
N
13
N
12
N
11
N
10
NN
9
N
8
Ratio
N
3
000000000
1
1
4
000000001
0
0
#
#########
#
#
2047
1
1
1
1
1
1
1
1
1
1
1
Note
Divide ratio 3 to 2047 (Divide ratios less than 3 are prohibited)
EQUATION FOR OUTPUT FREQUENCY
DETERMINATION
fVCO e N c fOSC R
fVCO Output frequency of external voltage controlled oscil-
lator (VCO)
N
Preset divide ratio of binary 11-bit programmable
counter (3 to 2047)
fOSC Output frequency of the external reference frequency
oscillator
R
Preset divide ratio of binary 14-bit programmable ref-
erence counter (3 to 16383)
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