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LMX2330A Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2330A
Description  PLLatinum??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)

LMX2330A Datasheet(HTML) 11 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
Bits are 10 or 11 (10 for IF counter and 11 for RF counter) data is transferred from the 22-bit shift register into a 4-bit or 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. For the IF N counter bits 5, 6, and 7 are don’t care bits. The RF N counter does not have don’t care
bits.
7-BIT SWALLOW COUNTER DIVIDE RATIO (A COUNTER)
RF
Divide
Ratio
A
N
7
N
6
N
5
N
4
N
3
N
2
N
1
0
0000000
1
0000001
•••••••
127
1111111
Note: Divide ratio: 0 to 127
B
≥ A
IF
Divide
Ratio
A
N
7
N
6
N
5
N
4
N
3
N
2
N
1
0
X
X
X
0000
1
X
X
X
0001
•••••••
15
X
X
X
1111
X = DON’T CARE condition
11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO (B COUNTER)
Divide
Ratio
B
N
18
N
17
N
16
N
15
N
14
N
13
N
12
N
11
N
10
N
9
N
8
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 ≤ 127 {RF}, 0 ≤ A ≤ 15 {IF}, 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 (for IF ;P = 8or16;
for RF ; LMX2330A: P = 32 or 64
LMX2331A/32A: P = 64 or 128)
PROGRAMMABLE MODES
Several modes of operation can be programmed with bits R16–R20 including the phase detector polarity, charge pump
TRI-STATE and the output of the F
oLD pin. The prescaler and powerdown modes are selected with bits N19 and N20. The pro-
grammable modes are shown in
Table 1. Truth table for the programmable modes and F
oLD output are shown in Table 2 and
Table 3.
DS012331-15
www.national.com
11


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