PLL701-21 Datasheet, PDF (1/4 Pages) PhaseLink Corporation – Low EMI Spread Spectrum Multiplier Clock

Preliminary PLL701-21
Low EMI Spread Spectrum Multiplier Clock
FEATURES
• Spread Spectrum Clock Generator with selectable
SST mode.
• Output frequency ranges: 24MHz to 200MHz.
• Selectable Center Spread Modulation.
• TTL/CMOS compatible outputs.
• 3.3V Operating Voltage.
• Low short-term jitter.
• Available in 8-Pin 150mil SOIC.
DESCRIPTION
The PLL701-21 is a Spread Spectrum Clock
Generator designed for the purpose of reducing EMI
in high-speed digital systems, with selectable Center
Spread modulation magnitude (see table below). The
device operates over a very wide range of input
frequencies and provides a 1x modulated clock
output.
PIN CONFIGURATION
FIN 1
S2^ 2
S1^ 3
S0^v 4
8 VDD
7 S3^
6 FOUT
5 GND
FIN = 24 ~ 200 Mhz
Note: v: 30kΩ Internal Pull down. ^: 30kΩ Internal Pull up.
SST BY-PASS SELECTOR
S3
Spread Spectrum Mode
0
OFF
1
ON (See below) Default
Note: S3 has an internal Pull Up. Default=”1”
MODULATION MAGNITUDE SELECTION
S2
S1
S0
FIN Range
(MHz)
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
24 - 200
24 - 200
24 - 200
24 - 200
24 - 200
24 - 200
24 - 200
24 - 200
FOUT
X1
X1
X1
X1
X1
X1
X1
X1
Spread Spectrum Modulation
Frequency
Fin / 1024
Magnitude
±0.75%
±1.00%
±1.25%
±0.125%
±0.25%
±0.50%
±0.375%
±0.625%
47745 Fremont Blvd., Fremont, California 94538 Tel [phone] Fax [phone] www.phaselink.com Rev 05/12/05 Page 1