Datasheet

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MAX31180

Spread-Spectrum Crystal Multiplier

General Description

The MAX31180 is a low-jitter, crystal-based clock gen-

erator with an integrated phase-locked loop (PLL) to

generate 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

MAX31180 has a spread-spectrum disable mode and a

power-down mode to conserve power.

Applications

Automotive

Cable Modems

Cell Phones

Computer Peripherals

Copiers

Infotainment

PCs

Printers

Features

S Generates Spread-Spectrum Clocks from 16MHz

to 134MHz

S Selectable Clock Multiplier Rates of 1x, 2x, and 4x

S Center Spread-Spectrum Dithering

S Selectable Spread-Spectrum Modulation

Magnitudes of ±0.5%, ±1.0%, and ±1.5%

S Spread-Spectrum Disable Mode

S Low Cycle-to-Cycle Jitter

S Power-Down Mode with High-Impedance Output

S Low Power Consumption

S 3.0V to 3.6V Single-Supply Operation

S -40°C to +125°C Operating Temperature Range

S Small 8-Pin µSOP Package

Typical Operating Circuit

19-6524; Rev 1; 3/13

Ordering Information appears at end of data sheet.

For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/MAX31180.related

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

SPREAD-SPECTRUM MAGNITUDE OF ±0.5%.

SSO

PDN

CRYSTAL

DECOUPLING

CAPACITOR

GND

CMSEL

SMSEL

MAX31180

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

Summary of content (9 pages)

PAGE 1
MAX31180 Spread-Spectrum Crystal Multiplier General Description The MAX31180 is a low-jitter, crystal-based clock generator with an integrated phase-locked loop (PLL) to generate 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 MAX31180 has a spread-spectrum disable mode and a power-down mode to conserve power.
PAGE 2
MAX31180 Spread-Spectrum Crystal Multiplier ABSOLUTE MAXIMUM RATINGS (Voltages relative to GND.) Voltage Range on VCC..........................................-0.3V to +4.3V Voltage Range on Any Pin....................... -0.3V to (VCC + 0.3V), not to exceed +4.3V Continuous Power Dissipation (TA = +70°C) μSOP (derate 4.5mW/°C above +70°C).......................362mW Operating Temperature Range......................... -40°C to +125°C Storage Temperature Range.............................
PAGE 3
MAX31180 Spread-Spectrum Crystal Multiplier DC ELECTRICAL CHARACTERISTICS (VCC = +3.0V to +3.6V, TA = -40°C to +125°C, unless otherwise noted.
PAGE 4
MAX31180 Spread-Spectrum Crystal Multiplier Typical Operating Characteristics (VCC = 3.3V, TA = +25°C, unless otherwise noted.) 11 10 9 8 AT 16MHz CMSEL = 1x 11 10 9 17 15 13 11 8 7 3.2 9 7 3.4 10 -40 SUPPLY VOLTAGE (V) 60 110 60 MAX31180 toc04 0.04 0.03 0.02 AT 16MHz 58 56 DUTY CYCLE (%) PDN SUPPLY CURRENT (mA) 31 DUTY CYCLE vs. TEMPERATURE AT 16MHz CMSEL = 1x 0.05 26 FREQUENCY (MHz) PDN SUPPLY CURRENT vs. TEMPERATURE 0.06 21 16 TEMPERATURE (°C) MAX31180 toc05 3.
PAGE 5
MAX31180 Spread-Spectrum Crystal Multiplier Pin Configuration TOP VIEW + 8 X2 7 VCC 3 6 SSO SMSEL 4 5 PDN X1 1 GND 2 CMSEL MAX31180 µSOP Pin Description 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. Tri-level digital input. 0 = 1x Open = 2x 1 = 4x SMSEL Spread-Spectrum Magnitude Select.
PAGE 6
MAX31180 Spread-Spectrum Crystal Multiplier Block Diagram VCC X1 16MHz TO 33.4MHz X2 CL1 VCC fIN CRYSTAL OSCILLATOR 1x/2x/4x CLOCK MULTIPLYING PLL WITH SPREAD SPECTRUM SSO fSSO fSSO = 16MHz TO 134MHz CL2 PDN CMSEL SMSEL GND CONFIGURATION DECODE AND CONTROL MAX31180 NOTE: SEE INFORMATION ABOUT CL1 AND CL2 IN THE APPLICATIONS INFORMATION SECTION AT THE END OF THE DATA SHEET. Detailed Description The MAX31180 is a crystal multiplier with center spreadspectrum capability. A 16MHz to 33.
PAGE 7
MAX31180 Spread-Spectrum Crystal Multiplier fSSO DITHER CYCLE RATE = fDITHER = fIN/992 +1.5% +1.0% +0.5% f0 -0.5% -1.0% -1.5% t Figure 1. Spread-Spectrum Frequency Modulation Crystal Capacitor Selection The load capacitors CL1 and CL2 are selected based on the crystal specifications (from the data sheet of the crystal used). The crystal parallel load capacitance is calculated as follows: CL1 × CL2 CL = + CIN C L1 + CL2 Equation 1 For the MAX31180 use CL1 = CL2 = CLX.
PAGE 8
MAX31180 Spread-Spectrum Crystal Multiplier Package Information Ordering Information PART TEMP RANGE PIN-PACKAGE MAX31180AUA+ -40NC to +125NC 8 FSOP MAX31180AUA+T -40NC to +125NC 8 FSOP MAX31180AUA/V+ -40NC to +125NC 8 FSOP MAX31180AUA/V+T -40NC to +125NC 8 FSOP +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. /V denotes an automotive qualified part. Maxim Integrated For the latest package outline information and land patterns (footprints), go to www.maximintegrated.
PAGE 9
MAX31180 Spread-Spectrum Crystal Multiplier Revision History REVISION NUMBER REVISION DATE 0 12/12 Initial release — 1 3/13 Added automotive qualified parts to Ordering Information 8 DESCRIPTION PAGES CHANGED Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.