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LMX2305 Datasheet(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2305
Description  PLLatinumTM 550 MHz 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)

LMX2305 Datasheet(HTML) 7 Page - National Semiconductor (TI)

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Functional Description (Continued)
PROGRAMMABLE DIVIDER (N COUNTER)
The N counter consists of the 7-bit swallow counter (A counter) and the 11-bit programmable counter (B counter) If the Control
Bit (last bit shifted into the Data Register) is LOW data is transferred from the 19-bit shift register into a 7-bit latch which sets
the 7-bit Swallow (A) Counter and an 11-bit latch which sets the 11-bit programmable (B) Counter Serial data format is shown
below
TLW12459 – 15
Note
S8 to S18 Programmable counter divide ratio control bits (3 to 2047)
7-BIT SWALLOW COUNTER DIVIDE RATIO
(A COUNTER)
Divide
N
7
N
6
N
5
N
4
N
3
N
2
N
1
Ratio
A
0
0
000000
1
0
000001
#
#
######
127
1111111
Note
Divide ratio 0 to 127
B t A
11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO
(B COUNTER)
Divide
18
N
17
N
16
N
15
N
14
N
13
N
12
N
11
N
10
NN
9
N
8
Ratio
B
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)
B t A
PULSE SWALLOW FUNCTION
fVCO e (P c B) a A c fOSC R
fVCO Output frequency of external voltage controlled oscil-
lator (VCO)
B
Preset divide ratio of binary 11-bit programmable
counter (3 to 2047)
A
Preset divide ratio of binary 7-bit swallow counter
(0 s A s 127 A s B)
fOSC Output frequency of the external reference frequency
oscillator
R
Preset divide ratio of binary 14-bit programmable ref-
erence counter (3 to 16383)
P
Preset modulus of dual modulus prescaler (64 or 128)
http
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7


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