ICS309
S
ERIAL
P
ROGRAMMABLE
T
RIPLE
PLL SS V
ERSA
C
LOCK
S
YNTHESIZER
Description
The ICS309 is a versatile serially-programmable, triple
PLL with spread spectrum clock source. The ICS309
can generate any frequency from 250kHz to 200 MHz,
and up to 6 different output frequencies simultaneously.
The outputs can be reprogrammed on-the-fly, and will
lock to a new frequency in 10 ms or less.
To reduce system EMI emissions, spread spectrum is
available that supports modulation frequencies of
31 kHz and 120 kHz, as well as modulation amplitudes
of +/-0.25% to +/-2.0%. Both center and down-spread
options are available.
The device includes a PDTS pin which tri-states the
output clocks and powers down the entire chip.
The ICS309 default for non-programmed start-up are
buffered reference clock outputs on all clock output
pins.
ICS鈥?VersaClock programming software allows the
user to configure up to 9 outputs with target
frequencies, spread spectrum capabilities or buffered
reference clock outputs. The VersaClock
TM
software
automatically configures the PLLs for optimal overall
performance.
TM
Features
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Packaged in 20-pin SSOP (QSOP)
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Highly accurate frequency generation
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M/N Multiplier PLL: M = 1..2048, N = 1..1024
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Serially programmable: user determines the output
frequency via a 3-wire interface
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Spread Spectrum frequency modulation for reduced
system EMI
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Center or Down Spread up to 4% total
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Selectable 32 kHz and 120 kHz modulation
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Eliminates need for custom quartz oscillators
Input crystal frequency of 5 - 27 MHz
Input clock frequency of 3 - 50 MHz
Output clock frequencies up to 200 MHz
Operating voltage of 3.3 V
Up to 9 reference clock outputs
Power down tri-state mode
Very low jitter
Block Diagram
V DD
3
STROBE
SCLK
DATA
P LL1 w ith
S pread
S pectrum
CLK1
CLK2
Divide
Logic
and
Output
Enable
Control
CLK3
CLK4
CLK5
CLK6
CLK7
CLK8
P LL2
C rystal or
clock input
X 1/IC LK
C rystal
O scillator
X2
P LL3
CLK9
E xternal capacitors are
required w ith a crystal input.
GND
2
P D TS
MDS 309 G
I n t e gra te d C i r c u i t S y s t e m s
鈼?/div>
1
5 25 Race Stre et, San Jo se, CA 9 5126
鈼?/div>
Revision 122704
te l (40 8) 2 97-12 01
鈼?/div>
w w w. i c st . c o m
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英文版
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Triple PLL Field Programmable SS VersaClock Synthesizer
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