Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsDS1080CLU+

DS1080CL

Spread-Spectrum Crystal Multiplier

________________________________________________________________

Maxim Integrated Products

19-6068; Rev 1; 10/11

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.

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.

Applications

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

SSO

PDNSMSEL

GND

CMSEL

TOP VIEW

DS1080CL

Pin Configuration

Denotes a lead-free package.

/V denotes an automotive qualified part.

T = Tape and reel.

Ordering Information

PART TEMP RANGE PIN-PACKAGE

DS1080CLU+ -40°C to +125°C 8 μSOP

DS1080CLU+T -40°C to +125°C 8 μSOP

DS1080CLU/V+ -40°C to +125°C 8 μSOP

DS1080CLU/V+T -40°C to +125°C 8 μSOP

Automotive

Cable Modems

Cell Phones

Computer Peripherals

Copiers

Infotainment

PCs

Printers

NOTE: IN THE ABOVE CONFIGURATION WITH PDN CONNECTED TO V

, 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%.

SSO

PDN

CRYSTAL

DECOUPLING

CAPACITOR

GND

CMSEL

SMSEL

DS1080CL

Typical Operating Circuit

Summary of content (8 pages)

PAGE 1
9-6068; Rev 1; 10/11 Spread-Spectrum Crystal Multiplier Features The DS1080CL is a low-jitter, crystal-based clock generator 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.
PAGE 2
DS1080CL Spread-Spectrum Crystal Multiplier ABSOLUTE MAXIMUM RATINGS Voltage Range on VCC Relative to GND .............-0.5V to +3.63V Voltage Range on Any Pin Relative to GND ...............-0.5V to (VCC + 0.5V), not to exceed +3.63V Continuous Power Dissipation (TA = +75°C) µSOP (derate 4.5mW/°C above +70°C).......................362mW Operating Temperature Range .........................-40°C to +125°C Storage Temperature Range .............................
PAGE 3
Spread-Spectrum Crystal Multiplier DS1080CL AC ELECTRICAL CHARACTERISTICS (VCC = +3.0 to +3.6V, TA = -40°C to +125°C, unless otherwise noted.) PARAMETER SSO Duty Cycle SYMBOL SSODC CONDITIONS Measured at VCC/2 MIN TYP 45 MAX 55 UNITS % Rise Time tR (Note 6) 1.6 ns Fall Time tF (Note 6) 1.
PAGE 4
Typical Operating Characteristics (VCC = 3.3V, TA = +25°C, unless otherwise noted.) 6 CMSEL = 1x 4 2 10 CMSEL = 2x 8 6 4 CMSEL = 1x 3.45 3.55 3.65 -40 -15 SUPPLY VOLTAGE (V) CMSEL = 4x 51 50 CMSEL = 2x CMSEL = 1x 48 60 85 8 110 CMSEL = 4x 53 CMSEL = 2x 50 49 64 CMSEL = 1x -15.6dB -40 -50 -60 -70 -80 -90 45 TEMPERATURE (°C) 56 -30 46 110 48 -11dB -14.
PAGE 5
Spread-Spectrum Crystal Multiplier PIN NAME 1 X1 2 GND 3 4 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. Signal Ground CMSEL Clock Multiplier Select. Trilevel digital input. 0 = 1x Open = 2x 1 = 4x 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.
PAGE 6
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 spreadspectrum clocks from 8MHz to 64MHz.
PAGE 7
Spread-Spectrum Crystal Multiplier Crystal Selection The DS1080CL requires a parallel resonating crystal operating in the fundamental mode, with an ESR of less than 90Ω. The crystal should be placed very close to the device to minimize excessive loading due to parasitic capacitances. Power-Supply Decoupling To achieve best results, it is highly recommended that a decoupling capacitor is used on the IC power-supply pins. Typical values of decoupling capacitors are 0.001μF and 0.1μF.
PAGE 8
DS1080CL Spread-Spectrum Crystal Multiplier Revision History REVISION NUMBER REVISION DATE 0 5/08 1 10/11 DESCRIPTION Initial release PAGES CHANGED — Updated the Ordering Information table and the Absolute Maximum Ratings section; added the land pattern no. to the Package Information table 1, 2, 7 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.