LMX2331LSLBX National Semiconductor, LMX2331LSLBX Datasheet - Page 15

• Manufacturer Part Number: LMX2331LSLBX
• Description: PLL Frequency Synthesizer Dual 45MHz to 2000MHz 24-Pin LAM CSP T/R
• Manufacturer: National Semiconductor
• Type: PLL Frequency Synthesizerr

Specifications of LMX2331LSLBX

• Package: 24LAM CSP
• Number Of Elements Per Chip: 2
• Operating Temperature: -40 to 85 °C
• Operating Supply Voltage: 3 V

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)
Notes: Divide ratio: 0 to 127
Note: Divide ratio: 3 to 2047 (Divide ratios less than 3 are prohibited)
PULSE SWALLOW FUNCTION
f
VCO
f
B:
A:
f
R:
P:
VCO
OSC
= [(P × B) + A] × f
B
B
:
:
≥
≥
A
A
Output frequency of external voltage controlled oscillator (VCO)
Preset divide ratio of binary 11-bit programmable counter (3 to 2047)
Preset divide ratio of binary 7-bit swallow counter
Output frequency of the external reference frequency oscillator
Preset divide ratio of binary 15-bit programmable reference counter (3 to 32767)
Preset modulus of dual moduIus prescaler (for IF; P = 8 or 16;
for RF; LMX2330L: P = 32 or 64
Divide
Ratio
127
(0
A
0
1
•
≤
A
≤
N
7
0
0
1
OSC
•
127 {RF}, 0
/R
N
6
0
0
1
•
RF
11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO (B COUNTER)
N
5
0
0
1
•
Divide
N
4
0
0
1
Ratio
•
2047
≤
12806 Version 9 Revision 2
B
3
4
•
A
N
3
0
0
1
•
≤
N
2
0
0
1
15 {IF}, A
•
18
N
0
0
1
•
N
1
0
1
1
•
LMX2331L/32L: P = 64 or 128)
17
N
0
0
1
•
≤
16
N
0
0
1
B)
•
15
N
0
0
1
•
Print Date/Time: 2011/07/11 15:54:42
15
14
N
0
0
1
•
X = DON'T CARE condition
13
N
0
0
1
•
12
N
0
0
1
•
11
N
0
0
1
•
Divide
Ratio
15
10
A
N
0
1
0
1
1
•
•
N
9
1
0
1
•
N
X
X
X
7
•
N
8
1
0
1
•
N
6
X
X
X
•
IF
1280608
N
X
X
X
5
•
N
4
0
0
1
•
N
3
0
0
1
•
N
2
0
0
1
•
N
1
0
1
1
•
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