DS1080CL Datasheet, PDF (5/8 Pages) Maxim Integrated Products – Spread-Spectrum Crystal Multiplier

Spread-Spectrum Crystal Multiplier
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
Clock Multiplier Select. Trilevel digital input.
3
CMSEL
0 = 1x
Open = 2x
1 = 4x
Spread-Spectrum Magnitude Select. Trilevel digital input.
4
SMSEL
0 = ±0.5%
Open = ±1.0%
1 = ±1.5%
Power-Down/Spread-Spectrum Disable. Trilevel digital input.
5
PDN
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.
Block Diagram
8MHz
TO
16MHz
X1
f_IN
CRYSTAL
X2
OSCILLATOR
C_L1
C_L2
1x/2x/4x CLOCK MULTIPLYING
PLL WITH SPREAD SPECTRUM
CMSEL
SMSEL
CONFIGURATION DECODE
AND CONTROL
DS1080CL
V_CC
V_CC
SSO
f_SSO
PDN
GND
f_SSO = 8MHz
TO
64MHz
NOTE: SEE INFORMATION ABOUT C_L1 AND C_L2 IN THE APPLICATIONS INFORMATION SECTION.
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