器件名称: ABE0121SC
功能描述: Low EMI Spread Spectrum Multiplier Clock
文件大小: 50.06KB 共4页
简 介:ABE0121
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.
PIN CONFIGURATION
FIN S2^ S1^ S0v 1 8 VDD S3^ FOUT GND
ABE0121
2 3 4
7 6 5
FIN = 24 ~ 200 Mhz
Note: v: 30k Internal Pull down. ^: 30k Internal Pull up.
DESCRIPTION
The ABE0121 is a Spread Spectrum Clock Generator designed for the purpose of reducing EMI in highspeed 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.
SST BY-PASS SELECTOR
S3
0 1
Spread Spectrum Mode
OFF ON (See below) Default
Note: S3 has an internal Pull Up. Default=”1”
MODULATION MAGNITUDE SELECTION
S2
0 0 0 0 1 1 1 1
S1
0 0 1 1 0 0 1 1
S0
0 1 0 1 0 1 0 1
FIN Range (MHz)
24 24 24 24 24 24 24 24 200 200 200 200 200 200 200 200
Spread Spectrum Modulation FOUT
X1 X1 X1 X1 X1 X1 X1 X1
Frequency
Magnitude
± 0.75% ± 1.00% ± 1.25% ± 0.125% ± 0.25% ± 0.50% ± 0.375% ± 0.625%
Fin / 1024
30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 03/21/05 Page 1
ABE0121
Low EMI Spread Spectrum Multiplier Clock
BLOCK DIAGRAM
FIN
PLL SST
FOUT
S(0:3)
Control Logic
PIN DESCRIPTIONS
Name
FIN S2 S1 S0 GND FOUT S3 ……
