FD7745T Pletronics, Inc., FD7745T Datasheet - Page 11

• Manufacturer Part Number: FD7745T
• Description: Fd7t Series Multi-output Cmos Clock Oscillator
• Manufacturer: Pletronics, Inc.

Example of the PLL synthesizing a frequency.
25MHz Reference Frequency
Multiply by 8 to 200MHz
Divide the 200MHz PLL output by 8
Phase noise plot of the resulting 25MHz on Out 2
30
25
20
15
10
5
0
10
9
8
7
6
5
4
3
2
1
0
10 30 50 70 90 110 130 150 170 190 210 230
10 30 50 70 90 110 130 150 170 190 210 230
V
FD7xxxTL V
DDOUT
No Load
www.pletronics.com
=3.3V
Fout (MHz)
FD7xxxT
Fout (MHz)
DD
= V
DDOUT
I
DDOUT
=1.8V
20
18
16
14
12
10
8
6
4
2
0
10 30
V
425-776-1880
DDOUT
No Load
Current for Various Number of Outputs On
50 70
=2.5V
7 Outputs On
6 Outputs On
5 Outputs On
4 Outputs On
3 Outputs On
2 Outputs On
1 Output On
All outputs Off
90 110 130 150 170 190 210 230
Fout (MHz)
FD7T Series Multi-Output
VDD=1.8V
CMOS Clock Oscillator
90
80
70
60
50
40
30
20
10
0
Phase noise of the reference signal, Out1.
25MHz Reference Frequency
RMS jitter is 1.4pS from 10Hz to 2MHz
10
30
FD7 Series I
V
50 70
DD
14
12
10
8
6
4
2
0
=1.8V
10 30 50 70 90 110 130 150 170 190 210 230
V
PLL Frequency (MHz)
DDOUT
90 110 130 150 170 190 210 230
=1.8V
DD
Fout (MHz)
versus PLLs Used
May 2008
11
4 PLLs On
3 PLLs On
2 PLLs On
1 PLL On
All PLLs Off
7 Outputs On
6 Outputs On
5 Outputs On
4 Outputs On
3 Outputs On
2 Outputs On
1 Output On
All outputs Off