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| Rev 0; 9/06 Automotive Temperature Range Spread-Spectrum Econoscillator General Description The DS1091L is a low-cost clock generator that is factorytrimmed to output frequencies from 130kHz to 66.6MHz with a nominal accuracy of 0.25%. The device can also produce a center- or down-dithered spread-spectrum output with pin-selectable dither magnitude and rate. Assembled in an 8-pin MAX package, the DS1091L is designed to operate with a 3.0V to 3.6V power supply over the automotive temperature range (-40C to +125C). Features Spread-Spectrum Clock Output from 130kHz to 66.6MHz Operating Temperature Range of -40C to +125C Accuracy of 1.75% Across Temperature and Voltage Factory Trimmed Center-Dithered (DS1091LA) or Down-Dithered (DS1091LB) Spread-Spectrum Output Pin-Selectable Center-Dither Magnitude of 0%, 1%, 2%, or 4% Pin-Selectable Down-Dither Magnitude of 0%, -2%, -4%, or -8% Pin-Selectable Dither Rate 3.0V to 3.6V Supply Operation Lead-Free 8-Pin MAX Package DS1091L Applications Automotive Infotainment POS Terminals LCD Displays Printers Industrial Control Ordering Information PART DS1091LUA+027 DS1091LUA+033 DS1091LUA+066 DS1091LUA+xxx DS1091LUB+027 DS1091LUB+033 DS1091LUB+066 DS1091LUB+xxx TEMP RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C PIN-PACKAGE 8 MAX 8 MAX 8 MAX 8 MAX 8 MAX 8 MAX 8 MAX 8 MAX SPREAD SPECTRUM Center Center Center Center Down Down Down Down OUTPUT FREQUENCY (MHz) 27.0 33.3 66.6 Custom (Contact Factory) 27.0 33.3 66.6 Custom (Contact Factory) +Denotes lead-free package. xxx Denotes factory-programmed custom frequencies. Email Custom_EconOscillators_Info@dalsemi.com for information/questions concerning custom frequencies. Typical Operating Circuit VCC fOUT OUT VCC VCC DECOUPLING CAPACITORS 1 2 8 7 DR N.C. Pin Configuration TOP VIEW OUT VCC GND SEL1 1 2 3 4 8 7 6 5 DR N.C. N.C. SEL0 GND 3 DS1091L 6 N.C. VCC DS1091L SEL1 4 5 SEL0 MAX MAX 8 MAX 8 MAX ______________________________________________ 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. Automotive Temperature Range Spread-Spectrum Econoscillator DS1091L ABSOLUTE MAXIMUM RATINGS Voltage on VCC Relative to Ground.......................-0.5V to +6.0V Voltage on DR, SEL0, SEL1 Relative to Ground* ..............................................-0.5V to (VCC + 0.5V) *This voltage must not exceed 6.0V. 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. Operating Temperature Range .........................-40C to +125C Storage Temperature Range .............................-55C to +125C Soldering Temperature...................See J-STD-020 Specification RECOMMENDED OPERATING CONDITIONS (TA = -40C to +125C.) PARAMETER Supply Voltage High-Level Input Voltage (SEL0, SEL1, DR) Low-Level Input Voltage (SEL0, SEL1, DR) SYMBOL VCC VIH VIL (Note 1) CONDITIONS MIN 3.0 0.7 x VCC -0.3 TYP 3.3 MAX 3.6 VCC + 0.3 0.3 x VCC UNITS V V V DC ELECTRICAL CHARACTERISTICS (TA = -40C to +125C; VCC = +3.0V to +3.6V, unless otherwise noted.) PARAMETER High-Level Output Voltage (OUT) Low-Level Output Voltage (OUT) High-Level Input Current (SEL0, SEL1, DR) Low-Level Input Current (SEL0, SEL1, DR) Supply Current (Active) SYMBOL VOH VOL IIH IIL ICC IOL = 4mA VCC = 3.6V VIL = 0 (Note 2) -1 16 CONDITIONS IOH = -4mA, VCC = 3.0V MIN 2.4 0.4 1 TYP MAX UNITS V V A A mA AC ELECTRICAL CHARACTERISTICS (TA = -40C to +125C; VCC = +3.0V to +3.6V, unless otherwise noted.) PARAMETER Output Frequency Range Output Center Frequency Tolerance Power-Up Time Load Capacitance SYMBOL fOUT fOUT tPU CL (Note 3) VCC = 3.3V, TA = +25C Across TA and VCC 0C to +70C, across VCC (Note 4) 15 CONDITIONS MIN 0.130 -0.25 -1.75 -1.2 0 TYP MAX 66.6 +0.25 +1.75 +1.2 0.1 50 ms pF % UNITS MHz 2 _____________________________________________________________________ Automotive Temperature Range Spread-Spectrum Econoscillator AC ELECTRICAL CHARACTERISTICS (continued) (TA = -40C to +125C; VCC = +3.0V to +3.6V.) PARAMETER Duty Cycle Jitter (RMS), 50MHz SYMBOL CONDITIONS < 33.3MHz (Note 3) 33.3MHz (Note 3) 40 0.3 MIN TYP 50 60 MAX UNITS % % DS1091L Note 1: Note 2: Note 3: Note 4: Note 5: All voltages are referenced to ground. Currents entering the IC are specified positive and currents exiting the IC are negative. Supply current measured with CL = 15pF, VCC = 3.6V, TA = 25C, fOUT = 66.6MHz, no dither. No dither. Guaranteed by design. For aging characteristics, contact factory. Typical Operating Characteristics (TA = +25C, VCC = 3.3V, unless otherwise noted.) FREQUENCY VARIATION (%) vs. TEMPERATURE DS1091L toc01 DS1091L toc02 ICC vs. TEMPERATURE 9.2 9.0 8.8 8.6 ICC (mA) 8.4 8.2 8.0 7.8 7.6 7.4 -40 -10 20 50 80 110 TEMPERATURE (C) VCC = 3.0V VCC = 3.3V VCC = 3.6V 1.75 1.25 FREQUENCY VARIATION (%) 0.75 0.25 -0.25 -0.75 -1.25 -1.75 -40 FREQUENCY VARIATION (%) vs. VOLTAGE 0.20 FREQUENCY VARIATION (%) 0.15 0.10 0.05 0.00 -0.05 -0.10 -0.15 -0.20 -0.25 NO DITHER fOUT = 130kHz fOUT = 66MHz DS1091L toc03 0.25 VCC = 3.3V NO DITHER fOUT = 130kHz fOUT = 66MHz -10 20 50 80 110 3.0 3.1 3.2 3.3 VCC (V) 3.4 3.5 3.6 TEMPERATURE (C) DUTY CYCLE vs. VCC DS1091L toc04 DUTY CYCLE vs. TEMPERATURE 58 56 DUTY CYCLE (%) 54 52 50 48 46 fOUT = 130kHz fOUT = 66MHz DS1091L toc05 52.0 51.5 51.0 DUTY CYCLE (%) 50.5 fOUT = 130kHz 50.0 49.5 49.0 48.5 48.0 3.0 3.1 3.2 3.3 VCC (V) 3.4 3.5 NO DITHER fOUT = 66MHz 60 44 42 40 3.6 -40 -15 10 35 60 85 110 TEMPERATURE (C) NO DITHER _____________________________________________________________________ 3 Automotive Temperature Range Spread-Spectrum Econoscillator DS1091L Typical Operating Characteristics (continued) (TA = +25C, VCC = 3.3V, unless otherwise noted.) SPECTRUM ATTENUATION vs. FREQUENCY AT DIFFERENT DITHER AMPLITUDES DS1091L toc07 OUTPUT RISE TIME 3.5 3.0 2.5 OUTPUT (V) 2.0 1.5 1.0 0.5 0.0 TIME (ns) RISE TIME = 1.02ns TYPICAL AT 12pF LOAD DS1091L toc06 OUTPUT FALL TIME 3.5 3.0 2.5 OUTPUT (V) 2.0 1.5 1.0 0.5 0.0 TIME (ns) FALL TIME = 1.13ns TYPICAL AT 12pF LOAD 5 0 -5 ATTENUATION (dB) -10 -15 -20 -25 -30 -35 RBW = 120kHz 0% CENTER DITHER 1% 2% 4% 8dB fOUT = 33.3MHz 11dB 14dB 31.9 32.4 32.9 33.4 33.9 34.4 34.9 FREQUENCY (MHz) Pin Description PIN MAX8 1 2 3 4 5 6, 7 8 NAME OUT VCC GND SEL1 SEL0 N.C. DR Spread-Spectrum Clock Output Supply Voltage Ground Spread Spectrum Dither Magnitude Select Inputs. Selects dither magnitude (see Table 1). No Connection Spread-Spectrum Dither Rate Selector. Selects dither rate (see Table 2). FUNCTION 4 _____________________________________________________________________ DS1091L toc08 Automotive Temperature Range Spread-Spectrum Econoscillator Block Diagram DS1091L DS1091L VCC VCC FACTORY-PROGRAMMED PRESCALER FACTORY-PROGRAMMED MASTER OSCILLATOR fMOSC fMOSC fDITHER fOUT OUT GND DITHER RATE DIVIDER TRIANGLE WAVE GENERATOR (DITHER %) DR WHERE fMOSC IS THE MASTER OSCILLATOR FREQUENCY. SEL1 SEL0 Detailed Description The DS1091L is a clock generator that is capable of output frequencies from 130kHz to 66.6MHz over the full automotive temperature range (-40C to +125C). The device also is capable of producing a spreadspectrum (dithered) square-wave output using four pinselectable dither percentages. Both center (DS1091LA) and down (DS1091LB) dithering options are available. The device also features two selectable dither rates. The DS1091L is shipped from the factory programmed to a customer-specified frequency. where n is defined in Table 2 as a function of output frequency. For example, for an output frequency of 27.0MHz, the dither rate would be 13.2kHz for DR = 0 and 6.6kHz for DR = 1. Table 1. SEL1 SEL0 LOGIC LEVEL LOGIC LEVEL 0 0 1 1 0 1 0 1 DITHER MAGNITUDE DS1091LA No Dither 1% 2% 4% DS1091LB No Dither -2% -4% -8% Spread Spectrum The DS1091L has the ability to reduce radiated emission peaks. The dither percentage is controlled by the state of the SEL0 and SEL1 pins. The output frequency can be dithered at 0%, 1%, 2%, and 4%, centered around the programmed frequency (for the DS1091LB this can be down dithered by 0%, -2%, -4%, and -8%). The two select pins SEL0 and SEL1 provide a means of selecting the dither magnitudes as follows: A triangle wave generator injects a control signal into the master oscillator to dither its output. The dither rate is a function of the output frequency, fOUT as well as the setting of the DR pin (see the equation below). Figure 1 shows a plot of the output frequency versus time. DITHER RATE = fOUT 2n Table 2. OUTPUT FREQUENCY fOUT (MHz) fOUT (min) 0.130 0.261 0.522 1.043 2.084 4.168 8.334 16.668 33.334 fOUT (max) 0.260 0.521 1.042 2.083 4.167 8.333 16.667 33.333 66.667 DR = LOGIC LEVEL 1 4 5 6 7 8 9 10 11 12 n DR = LOGIC LEVEL 0 5 6 7 8 9 10 11 12 13 _____________________________________________________________________ 5 Automotive Temperature Range Spread-Spectrum Econoscillator DS1091L IF DITHER AMOUNT = 0% PROGRAMMED fOUT+ (1%, 2%, OR 4% OF fOUT) PROGRAMMED fOUT PROGRAMMED fOUT(1%, 2%, OR 4% OF fOUT) 1 DITHER FREQ fOUT DITHER AMOUNT (1%, 2%, OR 4%) Application Information Power-Supply Decoupling To achieve best results, it is highly recommended that decoupling capacitors are used on the IC power-supply pins. Typical values of decoupling capacitors are 0.01F and 0.1F. Use a high-quality, ceramic, surface-mount capacitor, and mount it as close as possible to the VCC and GND pins of the IC to minimize lead inductance. TIME Requesting Custom Frequencies Email Custom_EconOscillators_Info@dalsemi.com for information/questions concerning custom frequencies. Figure 1A. Center Dithered Power-Up Upon the application of power, the DS1091L output is held in the low state until t PU has elapsed. This removes any possibility of erroneous output transitions during initial power-up. Chip Topology TRANSISTOR COUNT: 4887 SUBSTRATE CONNECTED TO GROUND Package Information For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo. DS1091L Frequency Spreading Profile as a Function of Dither % IF DITHER AMOUNT = 0% PROGRAMMED fOUT PROGRAMMED fOUT(2%, 4%, OR 8% OF fOUT) DITHER AMOUNT (-2%, -4%, OR -8%) 1 DITHER FREQ fOUT TIME Figure 1B. Down Dithered 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. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. is a registered trademark of Dallas Semiconductor Corporation. Springer |
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