Datasheet

DS1080CL
Spread-Spectrum Crystal Multiplier
_______________________________________________________________________________________ 5
CRYSTAL
OSCILLATOR
1x/2x/4x CLOCK MULTIPLYING
PLL WITH SPREAD SPECTRUM
CONFIGURATION DECODE
AND CONTROL
V
CC
V
CC
GND
NOTE: SEE INFORMATION ABOUT C
L1
AND C
L2
IN THE APPLICATIONS INFORMATION SECTION.
PDN
SSO
CMSEL
SMSEL
X1
X2
8MHz
TO
16MHz
f
SSO
= 8MHz
TO
64MHz
C
L1
C
L2
f
IN
f
SSO
DS1080CL
Block Diagram
Pin Description
PIN NAME FUNCTION
1 X1
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
3 CMSEL
Clock Multiplier Select. Trilevel digital input.
0 = 1x
Open = 2x
1 = 4x
4 SMSEL
Spread-Spectrum Magnitude Select. Trilevel digital input.
0 = ±0.5%
Open = ±1.0%
1 = ±1.5%
5 PDN
Power-Down/Spread-Spectrum Disable. Trilevel digital input.
0 = Power-Down/SSO High Impedance
Open = Power-Up/Spread Spectrum Disabled
1 = Power-Up/Spread Spectrum Enabled
6 SSO
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.
7 V
CC
Supply Voltage
8 X2
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.