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PDF DS1080L Data sheet ( Hoja de datos )
| Número de pieza | DS1080L | |
| Descripción | Spread-Spectrum Crystal Multiplier | |
| Fabricantes | Dallas Semiconductor | |
| Logotipo |  |
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Rev 1; 3/06
Spread-Spectrum Crystal Multiplier
General Description
The DS1080L is a low-jitter, crystal-based clock gener-
ator with an integrated phase-locked loop (PLL) to gen-
erate spread-spectrum clock outputs from 16MHz to
134MHz. The device is pin-programmable to select the
clock multiplier rate as well as the dither magnitude.
The DS1080L has a spread-spectrum disable mode
and a power-down mode to conserve power.
Automotive
Cable Modems
Cell Phones
Computer Peripherals
Copiers
Infotainment
PCs
Printers
Applications
Features
♦ Generates Spread-Spectrum Clocks from 16MHz
to 134MHz
♦ Selectable Clock Multiplier Rates of 1x, 2x, and 4x
♦ Center Spread-Spectrum Dithering
♦ Selectable Spread-Spectrum Modulation
Magnitudes of ±0.5%, ±1.0%, and ±1.5%
♦ Spread-Spectrum Disable Mode
♦ Low Cycle-to-Cycle Jitter
♦ Power-Down Mode with High-Impedance Output
♦ Low Cost
♦ Low Power Consumption
♦ 3.0V to 3.6V Single-Supply Operation
♦ -40°C to +125°C Temperature Operation
♦ Small 8-Lead µSOP Package
www.DataSheet4U.com
Pin Configuration
TOP VIEW
X1 1
GND 2
CMSEL 3
SMSEL 4
DS1080L
8 X2
7 VCC
6 SSO
5 PDN
Ordering Information
PART
DS1080L+
TEMP RANGE
-40°C to +125°C
+Denotes lead-free package.
PIN-PACKAGE
8 µSOP
µSOP
______________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
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. Tri-level digital input.
3
CMSEL
0 = 1x
Float = 2x
1 = 4x
Spread-Spectrum Magnitude Select. Tri-level digital input.
4
SMSEL
0 = ±0.5%
Float = ±1.0%
1 = ±1.5%
Power-Down/Spread-Spectrum Disable. Tri-level digital input.
5
PDN
0 = Power-Down/SSO Tri-Stated
Float = 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 VCC 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
16MHz
TO
33.4MHz
X1 fIN
CRYSTAL
X2 OSCILLATOR
CL1 CL2
1x/2x/4x CLOCK MULTIPLYING
PLL WITH SPREAD SPECTRUM
CMSEL
SMSEL
CONFIGURATION DECODE
AND CONTROL
DS1080L
VCC
VCC
SSO
fSSO
PDN
fSSO = 16MHz
TO
134MHz
GND
NOTE: SEE INFORMATION ABOUT CL1 AND CL2 IN THE APPLICATIONS INFORMATION SECTION AT THE END OF THE DATA SHEET.
_____________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet DS1080L.PDF ] | |
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