V CC TOP VIEW. f SSO = 20MHz to 134MHz (DITHERED)
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1 19-013; Rev 1; 10/11 0MHz to 13MHz Spread-Spectrum General Description The is a spread-spectrum clock modulator IC that reduces EMI in high clock-frequency-based, digital electronic equipment. Using an integrated phase-locked loop (PLL), the accepts an input clock signal in the range of 0MHz to 13MHz and delivers a spread-spectrum modulated output clock signal. The PLL modulates, or dithers, the output clock about the center input frequency at a pin-selectable magnitude and dither rate, allowing direct EMI control and optimization. In addition, through an enable pin the dithering can be enabled or disabled for easy comparison of system performance during EMI testing. This same input pin also allows the output to be three-stated. By dithering the system clock, all the address, data, and timing signals generated from this signal are also dithered so that the measured EMI at the fundamental and harmonic frequencies is greatly reduced. This is accomplished without changing clock rise/fall times or adding the space, weight, design time, and cost associated with mechanical shielding. The is provided in an -pin TSSOP package and operates over a full automotive temperature range of -0 C to +15 C. Applications LCD Panels for TVs, Desktop Monitors, and Notebook and Tablet PCs Automotive Telematics and Infotainment Printers Features Modulates a 0MHz to 13MHz Clock with Center Spread-Spectrum Dithering Selectable Spread-Spectrum Modulation Magnitudes of: ±0.5% ±1.0% ±1.5% ±.0% Low 75ps Cycle-to-Cycle Jitter Spread-Spectrum Disable Mode Pin Compatible with Alliance/PulseCore Semiconductor P00 Series Devices Clock Output Disable Low Power Consumption 3.3V Single Voltage Supply -0 C to +15 C Temperature Range Small -Pin TSSOP Package Ordering Information PART TEMP RANGE PIN-PACKAGE E+ -0 C to +15 C TSSOP E+T -0 C to +15 C TSSOP +Denotes a lead(pb)-free/rohs-compliant package. T = Tape and reel. Typical Operating Circuit appears at end of data sheet. Block Diagram Pin Configuration TOP VIEW CLKIN f IN = 0MHz TO 13MHz PLL WITH CENTER- DITHERED SPREAD SPECTRUM SSO f SSO = 0MHz to 13MHz (DITHERED) CLKIN SMSEL1 1 7 CRSEL CRSEL SMSEL1 SMSEL CONFIGURATION DECODE AND CONTROL ENABLE LOGIC SSEN GND SMSEL GND 3 5 SSO SSEN Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1--9-, or visit Maxim s website at
2 ABSOLUTE MAXIMUM RATINGS Voltage Range on Relative to GND V to +3.3V Voltage Range on Any Pin Relative to GND V to ( + 0.5V), not to exceed +3.3V Operating Temperature Range...-0 C to +15 C Continuous Power Dissipation (T A = +70 C) TSSOP (derate.1mw/ C above +70 C)...7mW Storage Temperature Range C to +15 C Lead Temperature (soldering, 10s) C Soldering Temperature (reflow)...+0 C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING CONDITIONS (TA = -0 C to +15 C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage (Note 1) V 0. x + Input Logic 1 V IH x Input Logic 0 V IL -0.3 V 0V < (Voltage applied to SSEN or Input Logic Open (SSEN, CRSEL) I OPEN ±1 μa CRSEL) < SSO < 0MHz 15 SSO Load C L pf 0MHz SSO < 13MHz 7 CLKIN Frequency f IN 0 13 MHz CLKIN Duty Cycle f INDC 0 0 % DC ELECTRICAL CHARACTERISTICS ( = +3.0V to +3.V, T A = -0 C to +15 C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS V Supply Current I CC C L = 7pF f IN = 13MHz 15 ma SMSEL1/SMSEL/CLKIN Input Leakage I IL:1 0V < V IN < μa CRSEL/SSEN Input Leakage I IL: 0V < V IN < μa Output Leakage (SSO) I OZ SSEN = open μa Low-Level Output Voltage (SSO) V OL I OL = ma 0. V High-Level Output Voltage (SSO) V OH I OH = -ma. V AC ELECTRICAL CHARACTERISTICS ( = +3.0V to +3.V, T A = -0 C to +15 C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SSO Duty Cycle f SSODC Measured at / 0 0 % SSO Rise Time t R C L = 7pF 1 ns SSO Fall Time t F C L = 7pF 1 ns Peak Cycle-to-Cycle Jitter t J T A = -0 C to +5 C, 10,000 cycles 75 ps Power-Up Time t POR (Note ) 50 ms Note 1: All voltages referenced to ground. Currents into the IC are positive and out of the IC are negative. Note : Time between power applied to device and stable output.
3 (T A = +5 C, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE 1 SUPPLY CURRENT (ma) 1 CLKIN = 13MHz 10 CLKIN = MHz CLKIN = 0MHz toc01 SUPPLY CURRENT (ma) SUPPLY CURRENT vs. TEMPERATURE CLKIN = 13MHz CLKIN = MHz CLKIN = 33MHz Typical Operating Characteristics toc0 SUPPLY CURRENT (ma) SUPPLY CURRENT vs. FREQUENCY = 3.V = 3.0V toc SUPPLY VOLTAGE (V) TEMPERATURE ( C) FREQUENCY (MHz) DUTY CYCLE vs. TEMPERATURE DUTY CYCLE vs. SUPPLY VOLTAGE SPECTRUM ATTENUATION vs. FREQUENCY AT DIFFERENT DITHER AMPLITUDES DUTY CYCLE (%) CLKIN = MHz toc0 DUTY CYCLE (%) CLKIN = MHz toc05 ATTENUATION (db) ±1.5% ±% ±1% 0.5% 3dB f OUT = 0MHz.5dB db toc f OUT = 0MHz RBW = 10KHz CENTER DITHER TEMPERATURE ( C) SUPPLY VOLTAGE (V) FREQUENCY (MHz) 3
4 PIN NAME FUNCTION 1 CLKIN Clock Input. 0MHz to 13MHz clock input (f IN ). SMSEL1 3 SMSEL GND Ground 5 SSEN SSO Pin Description Spread-Spectrum Magnitude Select Inputs. These digital inputs select the desired spread-spectrum magnitude as shown in the table below. SMSEL SMSEL1 MAGNITUDE SELECTED 0 0 ±.0% 0 1 ±1.5% 1 0 ±1.0% 1 1 ±0.5% Spread-Spectrum Enable. Three-level input to enable/disable spread-spectrum and to three-state the output. 0 = Power-up/spread-spectrum enabled. Open = SSO three-stated. 1 = Power-up/spread-spectrum disabled (not a bypass mode). Spread-Spectrum Clock Output. Outputs a center-dithered spread-spectrum version of the clock input at CLKIN. 7 CRSEL Supply Voltage Clock Range and Dither Rate Select. Three-level input that determines the dither rate. See the Detailed Description section for details. CRSEL CLKIN RANGE DITHER RATE 0 MHz to 13MHz f IN /0 Open 33MHz to 0MHz f IN /10 1 0MHz to 3MHz f IN /51 Detailed Description The modulates an input clock to generate a center-dithered spread-spectrum output. A 0MHz to 13MHz clock is applied to the CLKIN pin. An internal PLL dithers the output clock about its center frequency at a user-selectable magnitude. Spread-Spectrum Dither Magnitude The can generate dither magnitudes up to ±%. The desired magnitude is selected using input pins SMSEL1 and SMSEL as shown in Table 1. Table 1. Spread-Spectrum Dither Magnitude SMSEL SMSEL1 MAGNITUDE 0 0 ±.0% 0 1 ±1.5% 1 0 ±1.0% 1 1 ±0.5% Spread-Spectrum Dither Rate The output spread-spectrum dither rate is determined by the input frequency to maximize EMI reduction and to ensure that the dither rate is always above the audio frequency range. The user must configure CRSEL, based on Table, depending on the input frequency (f IN ) so that the appropriate dither rate is programmed. Table. Spread-Spectrum Dither Rate CRSEL CLKIN RANGE DITHER RATE 0 MHz to 13MHz f IN /0 Open 33MHz to 0MHz f IN /10 1 0MHz to 3MHz f IN /51
5 Spread-Spectrum Enable On power-up, the output clock (SSO) remains three-stated until the internal PLL reaches a stable frequency. The SSEN input can be used to disable the spread-spectrum modulation and to three-state the SSO output. If the SSEN pin is pulled high, the spread-spectrum modulation is turned off, but the device still uses the internal PLL to generate the clock signal at SSO. If the SSEN pin is open, the output is three-stated. Applications Information 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 0.01µF and 0.1µF. Use a high-quality, ceramic, surface-mount capacitor, and mount it as close as possible to the and GND pins of the IC to minimize lead inductance. IF SSEN = 1 f IN + (0.5%, 1.0%, 1.5%, OR.0% OF f IN ) f IN f IN - (0.5%, 1.0%, 1.5%, OR.0% OF f IN ) DITHER AMOUNT (±0.5%, ±1.0%, ±1.5%, OR ±.0%) f SSO 1 DITHER CYCLE RATE CLKIN RANGE (MHz) DITHER RATE TO 13 f IN /0 33 TO 0 f IN /10 0 TO 3 f IN /51 TIME Figure 1. Spread-Spectrum Frequency Modulation Typical Operating Circuit f IN = 0MHz TO 13MHz CLKIN SMSEL1 SMSEL GND CRSEL SSO SSEN f SSO DITHERED DECOUPLING CAPACITOR NOTE: IN THE ABOVE CONFIGURATION WITH SMSEL1, SMSEL, AND SSEN CONNECTED TO GND AS WELL AS CRSEL CONNECTED TO AND SSEN CONNECTED TO GND, THE DEVICE IS CONFIGURED WITH A SPREAD-SPECTRUM MAGNITUDE OF ±.0%, AND ALLOWS A CLKIN BETWEEN 0MHz and 3MHz. Package Information For the latest package outline information and land patterns (footprints), go to Note that a +, #, or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. TSSOP H
6 REVISION NUMBER REVISION DATE DESCRIPTION Revision History PAGES CHANGED 0 /07 Initial release 1 10/11 Updated the Absolute Maximum Ratings, Recommended Operating Conditions, and DC Electrical Characteristics; corrected pin number error in the Pin Description; added the Package Information table,, 5 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 10 San Gabriel Drive, Sunnyvale, CA Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
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