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DS1080CL Schematic ( PDF Datasheet ) - Maxim Integrated Products

Teilenummer DS1080CL
Beschreibung Spread-Spectrum Crystal Multiplier
Hersteller Maxim Integrated Products
Logo Maxim Integrated Products Logo 




Gesamt 8 Seiten
DS1080CL Datasheet, Funktion
www.DataSheet.co.kr
19-6068; Rev 1; 10/11
Spread-Spectrum Crystal Multiplier
General Description
The DS1080CL is a low-jitter, crystal-based clock gen-
erator with an integrated phase-locked loop (PLL) to
generate spread-spectrum clock outputs from 8MHz to
64MHz. The device is pin programmable to select the
clock multiplier rate as well as the dither magnitude.
The DS1080CL has a spread-spectrum disable mode
and a power-down mode to conserve power.
Automotive
Cable Modems
Cell Phones
Computer Peripherals
Applications
Copiers
Infotainment
PCs
Printers
Pin Configuration
TOP VIEW
+
X1 1
GND 2
CMSEL 3
DS1080CL
SMSEL 4
8 X2
7 VCC
6 SSO
5 PDN
Features
Generates Spread-Spectrum Clocks from 8MHz to
64MHz
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-Power Consumption
3.0V to 3.6V Single-Supply Operation
-40°C to +125°C Temperature Operation
Small 8-Pin µSOP Package
Ordering Information
PART
TEMP RANGE
DS1080CLU+
-40°C to +125°C
DS1080CLU+T
-40°C to +125°C
DS1080CLU/V+
-40°C to +125°C
DS1080CLU/V+T -40°C to +125°C
+Denotes a lead-free package.
/V denotes an automotive qualified part.
T = Tape and reel.
PIN-PACKAGE
8 μSOP
8 μSOP
8 μSOP
8 μSOP
Typical Operating Circuit
CRYSTAL
CL1 CL2
X1
GND
CMSEL
SMSEL
1
2
3
4
DS1080CL
X2
8
7 VCC
SSO
6
PDN
5
VCC
DECOUPLING
CAPACITOR
fSSO
VCC
NOTE: IN THE ABOVE CONFIGURATION WITH PDN CONNECTED TO VCC, SMSEL CONNECTED TO GND, AND CMSEL OPEN, THE DEVICE IS IN NORMAL
OPERATION WITH 2x CLOCK MULTIPLICATION AND A SPREAD-SPECTRUM MAGNITUDE OF ±0.5%.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Datasheet pdf - http://www.DataSheet4U.net/






DS1080CL Datasheet, Funktion
www.DataSheet.co.kr
Spread-Spectrum Crystal Multiplier
Detailed Description
The DS1080CL is a crystal multiplier with center
spread-spectrum capability. An 8MHz to 16MHz crystal
is connected to the X1 and X2 pins. Alternately, an
8MHz to 16MHz clock can be applied to X1 in place of
the crystal. In such applications, X2 would be left open
circuit. Using the CMSEL input, the user selects
whether the attached crystal or input clock is multiplied
by 1, 2, or 4. The DS1080CL can generate spread-
spectrum clocks from 8MHz to 64MHz.
The PLL can dither the output clock about its center fre-
quency at a user-selectable magnitude. Using the
SMSEL input, the user selects the dither magnitude.
The PDN input can be used to place the device into a
low-power standby mode where the SSO output is high
impedance. If the PDN pin is open, the SSO output is
active but the spread-spectrum dithering is disabled.
The spread-spectrum dither rate is fixed at fIN/512 to
keep the dither rate above the audio frequency range.
On power-up, the output clock (SSO) remains high
impedance until the PLL reaches a stable frequency
(fSSO) and dither (fDITHER). A power cycle is needed
for the PLL whenever there is a change in input fre-
quency, CMSEL, or SMSEL.
+1.5%
+1.0%
+0.5%
fO
-0.5%
-1.0%
-1.5%
DITHER CYCLE RATE = fDITHER = fIN/512
t
Figure 1. Spread-Spectrum Frequency Modulation
6 _______________________________________________________________________________________
Datasheet pdf - http://www.DataSheet4U.net/

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