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P701-31SC

Description
Low EMI Spread Spectrum Multiplier Clock
File Size196KB,5 Pages
ManufacturerPLL (PhaseLink Corporation)
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P701-31SC Overview

Low EMI Spread Spectrum Multiplier Clock

PLL701-31
Low EMI Spread Spectrum Multiplier Clock
FEATURE
Spread Spectrum Clock Generator with 1x
outputs.
Output frequency ranges: 10MHz to 30MHz.
Accepts input from crystal or reference clock.
Selectable Center, Down or Asymmetric Spread
Modulation.
Selectable Modulation magnitude.
TTL/CMOS compatible outputs.
3.0V (+/-10%) Supply Voltage.
Low short-term jitter.
Available in 8-Pin 150mil SOIC.
PIN CONFIGURATION
XIN/FIN
XOUT/SD*^
SC0^
SC1^
1
8
VDD
SC2^
FOUT
GND
PLL701-31
2
3
4
7
6
5
XIN/FIN = 10 ~ 30 MHz
Note:
^: Internal pull-up resistor (120kΩ for SD, 30 kΩ for
SC0-SC2).
*: The value of SD is latched upon power-up. The
internal pull-up resistor results in a default high value
when no pull-down resistor is connected to this pin
(recommended external pull-down resistor of 27 kΩ).
DESCRIPTION
The PLL701-31 is a Spread Spectrum Clock
Generator designed to reduce EMI in high-speed
digital systems. The device is designed to operate
from a crystal or reference clock input and provides a
1x modulated clock output. Center, Down and
Asymmetric spread types are selectable as well as
the modulation magnitude.
OUTPUT CLOCK SELECTION
SST Modulation
SD
0
1
1
1
1
1
0
0
0
0
SC2
1
0
0
1
1
1
0
0
0
0
SC1
1
0
1
0
0
1
0
0
1
1
SC0
Magnitude
0
1
0
0
1
0
0
1
0
1
3.75%
3.50%
3.75%
3.25%
3.50%
3.75%
3.25%
3.50%
3.75%
0.00%
Fin / 512
Freq.
D
D
A
D
A
A
C
C
C
Type
-3.75%
-3.50%
+0.125%, -3.625%
-3.25%
+0.125%, -3.375%
+0.25%, -3.5%
+/-1.625 %
+/-1.75%
+/-1.875%
SST OFF
Notes:
A: Asymmetric Spread. D: Down Spread. C: Center Spread.
47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991
www.phaselink.com
Rev 11/28/05 Page 1

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