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LMX2355TM Datasheet(PDF) 18 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LMX2355TM
Description  PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer
PDF  23 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX2355TM Datasheet(HTML) 18 Page - National Semiconductor (TI)

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Programming Description (Continued)
5.2.2 N REGISTER — (8/9/12/13) PRESCALER OPERATING IN FRACTIONAL MODE
(RF_N[6]–RF_N[20])
RF_N_CNTR [14:0]
Divide
Ratio
C Word
B Word
A Word
1–23
Divide Ratios Less than 24 are impossible since it is required that C>=3
24–39
Some of these N values are Legal Divide Ratios, some are not
40
00000000101000
0
41
00000000101000
1
...
...........
0
.
.
.
16383
11111111111011
1
N REGISTER — (16/17/20/21) PRESCALER OPERATING IN FRACTIONAL MODE
(RF_N[6]–RF_N[20])
RF_N_CNTR [14:0]
Divide
Ratio
C Word
B Word
A Word
1–47
Divide Ratios Less than 48 are impossible since it is required that C>=3
48–79
Some of these N values are Legal Divide Ratios, some are not
80
00000000101000
0
81
00000000101000
1
...
...........
0
.
.
.
32767
11111111111111
1
5.2.3 FRACTIONAL MODULUS ACCUMULATOR (FRAC_CNTR)
(RF_N[2]–RF_N[5])
Fractional Ratio (F)
FRAC_CNTR
Modulus 15
Modulus 16
RF_N[5]
RF_N[4]
RF_N[3]
RF_N[2]
0
0000
0
1/15
1/16
0
0
0
1
2/15
2/16
0
0
1
0
•
••••
•
14/15
14/16
1
1
1
0
N/A
15/16
1
1
1
1
www.national.com
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