LMX2330L National Semiconductor Corporation, LMX2330L Datasheet - Page 14

• Manufacturer Part Number: LMX2330L
• Description: Pllatinum? Low Power Dual Frequency Synthesizer For Rf Personal Communications
• Manufacturer: National Semiconductor Corporation

www.national.com
Functional Description
7-BIT SWALLOW COUNTER DIVIDE RATIO (A COUNTER)
PULSE SWALLOW FUNCTION
f
VCO
f
B:
A:
f
R:
P:
VCO
OSC
= [(P x B) + A] x f
: Output frequency of external voltage controlled oscillator (VCO)
: Output frequency of the external reference frequency oscillator
Preset divide ratio of binary 11-bit programmable counter (3 to 2047)
Preset divide ratio of binary 7-bit swallow counter
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
(0
Notes: Divide ratio: 0 to 127
Divide
Ratio
127
A
A
0
1
•
B
127 {RF}, 0
A
N
7
0
0
1
•
OSC
N
6
0
0
1
•
/R
11-BIT PROGRAMMABLE COUNTER DIVIDE RATIO (B COUNTER)
RF
N
5
0
0
1
•
Note: Divide ratio: 3 to 2047 (Divide ratios less than 3 are prohibited)
Divide
N
A
4
0
0
1
•
Ratio
2047
B
3
4
•
B
N
15 {IF}, A
3
0
0
1
•
A
(Continued)
N
2
0
0
1
•
18
N
0
0
1
•
N
1
0
1
1
•
LMX2331L/32L: P = 64 or 128)
17
N
0
0
1
•
B)
16
N
0
0
1
•
15
N
0
0
1
•
14
14
N
0
0
1
•
13
N
0
0
1
•
12
N
0
0
1
•
11
N
0
0
1
•
X = DON’T CARE condition
Divide
Ratio
15
10
A
0
1
N
0
1
1
•
•
N
9
1
0
1
•
N
X
X
X
7
•
N
8
1
0
1
•
N
X
X
X
6
•
IF
01280608
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
•