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LMX2336L Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LMX2336L
Description  PLLatinum??Low Power 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)

LMX2336L Datasheet(HTML) 11 Page - National Semiconductor (TI)

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Functional Description (Continued)
PROGRAMMABLE DIVIDER (N COUNTER)
Each N counter consists of the 7-bit swallow counter (A counter) and the 11-bit programmable counter (B counter). If the Control
Bits are 10 or 11 (10 for RF2 counter and 11 for RF1 counter) data is transferred from the 20-bit shift register into a 7-bit latch
(which sets the Swallow (A) Counter) and an 11-bit latch (which sets the 11-bit programmable (B) Counter), MSB first. Serial data
format is shown below.
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
0000000
1
0000001
•••••••
127
1111111
Notes:
Divide ratio: 0 to 127
B
≥ A
A < P
11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO (B COUNTER)
Divide
N
18
N
17
N
16
N
15
N
14
N
13
N
12
N
11
N
10
N
9
N
8
Ratio
B
3
00000000011
4
00000000100
•••••••••••
2047
11111111111
Note:
Divide ratio: 3 to 2047 (Divide ratios less than 3 are prohibited)
B
≥ A
PULSE SWALLOW FUNCTION
f
VCO = [(P xB)+ A]xfOSC/R
f
VCO:
Output frequency of external voltage controlled oscillator (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
≤ A ≤ P; A ≤ B)
f
OSC:
Output frequency of the external reference frequency oscillator
R:
Preset divide ratio of binary 15-bit programmable reference counter (3 to 32767)
P:
Preset modulus of dual moduIus prescaler (P = 64 or 128)
PROGRAMMABLE MODES
Several modes of operation can be programmed with bits R16–R20 including the phase detector polarity, charge pump tristate
and the output of the F
oLD pin. The prescaler and power down modes are selected with bits N19 and N20. The programmable
modes are shown in
Table 1. Truth table for the programmable modes and F
oLD output are shown in Table 2 and Table 3.
DS012807-7
www.national.com
11


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