KDK NEWS

Date: Oct 1st, 2005

Technical Report for Spread Spectrum Type Oscillators
EMI noise become a one of critical concern of high speed equipments.
High speed equipments requires high speed system clock, but it also cause the EMI noise.
The spread spectrum type oscillators newly developed for one of option to reduce EMI noise.

It is Surface Mount Type(7.5x5.0mm) package, and any frequency 8MHZ to 170MHZ is possible to produce by customer request.

 
 

Spread Spectrum Type:

Model: Size: Frequency: Spread Type:

CET- TYPE 7.5x5.0mm 8.0~170Mhz Center Spread
Down Spread

 
           

Model Name:

(1) (2) (3) (4) (5) (6)

 

CET 3 0 A C 025  
(1)  Model Name (CET)
(2) Voltage Option (Only 3=3.3V)
(3) Frequency Stability at Spread Off (0=+-100ppm,  5=+-50ppm)
(4) Temperature Range (A=-10~70C, F=-40~85C)
(5) Spread Type (C=Center Spread, D=Down Spread)
(6) Modulation Ratio (3digit: 0.25%=025, 1.00%=100)


Center Spread:
  +-0.25% +-0.5% +-0.75% +-1.0% +-1.50% +-2.0%
Model CET30AC025 CET30AC050 CET30AC075 CET30AC100 CET30AC150 CET30AC200
Down Spread:
  -0.50% -1.00% -1.50% -2.00% -3.00% -4.00%
Model CET30AD050 CET30AD100 CET30AD150 CET30AD200 CET30AD300 CET30AD400
 






Center Spread:
Reduce EMI symmetrically from output frequency


Down Spread:
Reduce EMI down-side from output frequency

Center Spread Down Spread
Specification:
Parameters Conditions CET30AC CET30AD
Input Current (max.) Frequency Ranges

8.0~170MHz  50mA  (Load=15pF)

Modulation Rate Center/Down Spread

+-0.25%, +-0.5%, +-0.75%
+-1.0%, +-1.5%, +-2.0%

-0.5%, -1.0%, -1.5%
-2.0%, -3.0%, -4.0%

Symmetry (max.) At 0.5Vdd

45%/55%

Output Voltage       Voh
                              Vol
"0" Level (max.)
"1" Level (min.)

0.33V (lol: 8mA)
2.97V(lol:8mA)

Rise/Fall Time
 
At 0.2Vdd~0.8Vdd

3.0ns
 

Jitter Cycle to Cycle
 
400ps max(<133MHZ) (SS ON)
250ps max >=133MHZ) (SS ON)
Modulation Frequency  

30kHz~33kHz

Start-Up Time (max.) Frequency Range 10ms
E/D Function #1  Open
#1 >=0.7Vdd
#1 <=0.3Vdd
#4 Active
#4 Active
#4 High Z

 

Center Spread Spectrum:
   
Spread Off   Spread +-2.0%   Clock Form at Spread +-2.0%
         

Down Spread Spectrum:

   
Spread Off   Spread -4.0%   Clock Form at Spread -4.0%
 
 
Applications
Laser Printer, Scanner, Fax, Modem,  Wireless LAN terminal, Printer Server, ADSL terminal, Storage Systems(CD-ROM, VCD, DVD and HDD)

< Download >  
SPEC SHEET (CET-Type )
 
 

Please contact us for any Questions and Requests.
KYUSHU DENTSU CO., LTD. (KDK)
340 Fukushige Omura Nagasaki 856-0006 Japan
TEL:+81-957-55-1313    FAX:+81-957-27-4018
EMAIL:  kdk@kdk-group.co.jp

http://www.kdk-group.co.jp