ABE0111 Datasheet, PDF (1/5 Pages) Abracon Corporation – Low EMI Spread Spectrum Multiplier Clock

ABE0111
Low EMI Spread Spectrum Multiplier Clock
FEATURES
• Spread Spectrum Clock Generator with selectable
multiplier ( 1x, 2x and 4x ).
• Output frequency ranges: 24MHz to 240MHz.
• Selectable center spread modulation rate.
• TTL/CMOS compatible outputs.
• 3.3V Operating Voltage.
• Low short term jitter.
• Available in 8-Pin 150mil SOIC.
DESCRIPTION
The ABE0111 is a Spread Spectrum Clock Generator
designed for the purpose of reducing EMI in high-
speed digital systems, with the selectable Center
Spread modulation amplitude (see table below). The
output frequency is selected by programming 4
multiplier modes. The device operates over a very
wide range of input frequencies and provides 1x to 4x
modulated clock outputs.
PIN CONFIGURATION
FIN 1
S2^ 2
S1^ 3
S0^v 4
8
VD
D
7 S3^v
6 FOUT
5 GND
FIN = 24 ~ 120 Mhz
Note: v: 30kΩ Internal Pull down. ^: 30kΩ Internal Pull up.
OUTPUT CLOCK (FOUT) SELECTION
S3
S2
S1
S0
FIN Range
(MHz)
0
0
0
0
0
0
0
1
0
0
1
0
0
0
1
1
0
1
0
0
0
1
0
1
0
1
1
0
0
1
1
1
1
0
0
0
1
0
0
1
1
0
1
0
1
0
1
1
1
1
0
0
1
1
0
1
1
1
1
0
1
1
1
1
24 - 60
24 - 60
24 - 60
24 - 60
24 - 60
24 - 60
24 - 60
24 - 60
24 - 60
24 - 60
24 - 60
24 - 60
60 - 120
60 - 120
60 - 120
60 - 120
FOUT
X1
X1
X1
X1
X2
X2
X2
X2
X2
X2
X4
X4
X1
X1
X1
X1
Spread Spectrum Modulation
Frequency
Fin / 1024
Magnitude
±0.75%
±1.00%
±1.25%
±1.50%
±0.25%
±0.50%
±0.75%
±1.00%
±1.25%
±1.50%
±0.25%
±0.50%
±0.25%
±0.50%
±0.75%
±1.00%
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: [phone] www.Abracon.com 03/21/05 Page 1