Spread-Spectrum Crystal Multiplier
Pin Description
PIN
1
NAME
X1
FUNCTION
Crystal Drive/Clock Input. A crystal with the proper loading capacitors is connected across X1 and X2.
Instead of a crystal, a clock can be applied at the X1 input.
2
GND
Signal Ground
Clock Multiplier Select. Tri-level digital input.
0 = 1x
Float = 2x
1 = 4x
3
4
5
CMSEL
SMSEL
Spread-Spectrum Magnitude Select. Tri-level digital input.
0 = 0.5%
Float = 1.0%
1 = 1.5%
Power-Down/Spread-Spectrum Disable. Tri-level digital input.
0 = Power-Down/SSO Tri-Stated
Float = Power-Up/Spread Spectrum Disabled
1 = Power-Up/Spread Spectrum Enabled
PDN
Spread-Spectrum Clock Multiplier Output. Outputs a 1x, 2x, or 4x spread-spectrum version of the crystal
or clock applied at the X1/X2 pins.
6
7
8
SSO
V
Supply Voltage
CC
Crystal Drive Output. A crystal with the proper loading capacitors is connected across X1 and X2.
If a clock is connected to X1, then X2 should be left open circuit.
X2
Block Diagram
V
CC
V
CC
f
IN
X1
X2
16MHz
TO
33.4MHz
f
= 16MHz
TO
134MHz
SSO
CRYSTAL
OSCILLATOR
1x/2x/4x CLOCK MULTIPLYING
PLL WITH SPREAD SPECTRUM
SSO
f
SSO
C
L2
C
L1
PDN
GND
CMSEL
SMSEL
CONFIGURATION DECODE
AND CONTROL
DS1080L
NOTE: SEE INFORMATION ABOUT C AND C IN THE APPLICATIONS INFORMATION SECTION AT THE END OF THE DATA SHEET.
L1
L2
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5
DALLAS [ DALLAS SEMICONDUCTOR ]
