User Guide

PAMS Technical Documentation 3. System Module
NSD-5
Issue 1 05/02 Nokia Corporation Page 51
7-Bit Swallow Counter Divide Ratio (A Counter)
RF
IF
X = Don’t Care condition
11-Bit Programmable Counter Divide Ratio (B Counter)
Determination of Output Frequency
f
VCO
=[(Px B)x f
OSC
/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 < 127 {RF}, 0 < A < 15 {IF}, A < B)
Divide
Ratio
A
R
7
R
6
R
5
R
4
R
3
R
2
R
1
0 0000000
1 0000001
. .......
127 1111111
Divide
Ratio
A
R
7
R
6
R
5
R
4
R
3
R
2
R
1
0 XXX0000
1 XXX0001
. .......
15 XXX1111
Divide
Ratio
B
R
18
R
17
R
16
R
15
R
14
R
12
R
11
R
10
R
9
R
8
3 0000000011
4 0000000100
. ..........
20471111111111