Rev 0; 9/06 Automotive Temperature Range Spread-Spectrum Econoscillator 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 µMAX package, the DS1091L is designed to operate with a 3.0V to 3.6V power supply over the automotive temperature range (-40°C to +125°C). Applications Automotive Infotainment Features ♦ Spread-Spectrum Clock Output from 130kHz to 66.6MHz ♦ Operating Temperature Range of -40°C to +125°C ♦ 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% POS Terminals LCD Displays ♦ Pin-Selectable Dither Rate Printers ♦ 3.0V to 3.6V Supply Operation Industrial Control ♦ Lead-Free 8-Pin µMAX Package Ordering Information PART TEMP RANGE PIN-PACKAGE SPREAD SPECTRUM OUTPUT FREQUENCY (MHz) DS1091LUA+027 -40°C to +125°C 8 µMAX Center 27.0 DS1091LUA+033 -40°C to +125°C 8 µMAX Center 33.3 DS1091LUA+066 -40°C to +125°C 8 µMAX Center 66.6 DS1091LUA+xxx -40°C to +125°C 8 µMAX Center Custom (Contact Factory) DS1091LUB+027 -40°C to +125°C 8 µMAX Down 27.0 DS1091LUB+033 -40°C to +125°C 8 µMAX Down 33.3 DS1091LUB+066 -40°C to +125°C 8 µMAX Down 66.6 DS1091LUB+xxx -40°C to +125°C 8 µMAX Down Custom (Contact Factory) +Denotes lead-free package. xxx Denotes factory-programmed custom frequencies. Email [email protected] for information/questions concerning custom frequencies. Typical Operating Circuit Pin Configuration VCC fOUT OUT VCC VCC DECOUPLING CAPACITORS GND SEL1 1 8 2 7 3 DS1091L 6 5 4 TOP VIEW DR N.C. N.C. SEL0 VCC OUT 1 8 VCC 2 7 N.C. GND 3 6 N.C. SEL1 4 5 SEL0 DS1091L DR µMAX μMAX μMAX 88 µMAX ______________________________________________ Maxim Integrated Products 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. 1 DS1091L General Description DS1091L Automotive Temperature Range Spread-Spectrum Econoscillator 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) Operating Temperature Range .........................-40°C to +125°C Storage Temperature Range .............................-55°C to +125°C Soldering Temperature...................See J-STD-020 Specification *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. RECOMMENDED OPERATING CONDITIONS (TA = -40°C to +125°C.) PARAMETER SYMBOL Supply Voltage VCC High-Level Input Voltage (SEL0, SEL1, DR) VIH Low-Level Input Voltage (SEL0, SEL1, DR) VIL CONDITIONS (Note 1) MIN TYP MAX UNITS 3.0 3.3 3.6 V 0.7 x VCC VCC + 0.3 V -0.3 0.3 x VCC V MAX UNITS DC ELECTRICAL CHARACTERISTICS (TA = -40°C to +125°C; VCC = +3.0V to +3.6V, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP High-Level Output Voltage (OUT) VOH IOH = -4mA, VCC = 3.0V Low-Level Output Voltage (OUT) VOL IOL = 4mA 2.4 0.4 V V High-Level Input Current (SEL0, SEL1, DR) IIH VCC = 3.6V 1 µA Low-Level Input Current (SEL0, SEL1, DR) IIL VIL = 0 Supply Current (Active) ICC (Note 2) -1 µA 16 mA MAX UNITS 66.6 MHz AC ELECTRICAL CHARACTERISTICS (TA = -40°C to +125°C; VCC = +3.0V to +3.6V, unless otherwise noted.) PARAMETER Output Frequency Range Output Center Frequency Tolerance SYMBOL fOUT ΔfOUT Power-Up Time tPU Load Capacitance CL 2 CONDITIONS MIN TYP (Note 3) 0.130 VCC = 3.3V, TA = +25°C -0.25 Across TA and VCC -1.75 +1.75 0°C to +70°C, across VCC -1.2 +1.2 0 (Note 4) _____________________________________________________________________ 15 +0.25 % 0.1 ms 50 pF Automotive Temperature Range Spread-Spectrum Econoscillator (TA = -40°C to +125°C; VCC = +3.0V to +3.6V.) PARAMETER SYMBOL CONDITIONS MIN TYP < 33.3MHz (Note 3) Duty Cycle UNITS 50 ≥ 33.3MHz (Note 3) 40 % 60 Jitter (RMS), 50MHz Note 1: Note 2: Note 3: Note 4: Note 5: MAX 0.3 % 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 = 25°C, fOUT = 66.6MHz, no dither. No dither. Guaranteed by design. For aging characteristics, contact factory. Typical Operating Characteristics (TA = +25°C, VCC = 3.3V, unless otherwise noted.) FREQUENCY VARIATION (%) VCC = 3.3V 8.2 8.0 VCC = 3.0V 7.8 0.75 0.25 fOUT = 130kHz -0.25 fOUT = 66MHz -0.75 7.4 -10 20 0.15 0.10 0.05 fOUT = 66MHz 0.00 -0.05 fOUT = 130kHz -0.10 50 80 110 NO DITHER -0.20 -1.75 -0.25 -40 -10 TEMPERATURE (°C) 20 50 80 110 3.0 3.1 3.2 TEMPERATURE (°C) 3.4 3.5 3.6 DUTY CYCLE vs. TEMPERATURE DUTY CYCLE vs. VCC 60 51.5 58 56 DUTY CYCLE (%) fOUT = 66MHz 50.5 fOUT = 130kHz 50.0 49.5 DS1091L toc05 52.0 51.0 3.3 VCC (V) DS1091L toc04 -40 0.20 -0.15 -1.25 7.6 DUTY CYCLE (%) ICC (mA) 8.6 0.25 DS1091L toc03 1.25 8.8 8.4 VCC = 3.3V NO DITHER FREQUENCY VARIATION (%) VCC = 3.6V DS1091L toc02 1.75 DS1091L toc01 9.2 9.0 FREQUENCY VARIATION (%) vs. VOLTAGE FREQUENCY VARIATION (%) vs. TEMPERATURE ICC vs. TEMPERATURE 54 fOUT = 66MHz 52 50 fOUT = 130kHz 48 46 49.0 44 NO DITHER 48.5 42 48.0 40 3.0 3.1 3.2 3.3 VCC (V) 3.4 3.5 3.6 NO DITHER -40 -15 10 35 60 85 110 TEMPERATURE (°C) _____________________________________________________________________ 3 DS1091L AC ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (TA = +25°C, VCC = 3.3V, unless otherwise noted.) 2.5 2.0 1.5 3.0 FALL TIME = 1.13ns TYPICAL AT 12pF LOAD 2.5 2.0 1.5 0 RBW = 120kHz 0% CENTER DITHER -10 8dB ±2% 11dB 14dB ±4% -15 -20 1.0 1.0 0.5 0.5 -30 0.0 0.0 -35 -25 31.9 TIME (ns) fOUT = 33.3MHz ±1% -5 ATTENUATION (dB) RISE TIME = 1.02ns TYPICAL AT 12pF LOAD 3.5 OUTPUT (V) 3.0 5 DS1091L toc07 DS1091L toc06 3.5 SPECTRUM ATTENUATION vs. FREQUENCY AT DIFFERENT DITHER AMPLITUDES OUTPUT FALL TIME DS1091L toc08 OUTPUT RISE TIME OUTPUT (V) DS1091L Automotive Temperature Range Spread-Spectrum Econoscillator 32.4 TIME (ns) 32.9 33.4 33.9 34.4 34.9 FREQUENCY (MHz) Pin Description PIN µMAX8 4 NAME FUNCTION 1 OUT Spread-Spectrum Clock Output 2 VCC Supply Voltage 3 GND Ground 4 SEL1 5 SEL0 6, 7 N.C. 8 DR 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). _____________________________________________________________________ Automotive Temperature Range Spread-Spectrum Econoscillator DS1091L VCC fMOSC GND fMOSC FACTORY-PROGRAMMED MASTER OSCILLATOR DITHER RATE DIVIDER DR fDITHER TRIANGLE WAVE GENERATOR (DITHER %) SEL1 FACTORY-PROGRAMMED PRESCALER VCC fOUT OUT SEL0 WHERE fMOSC IS THE MASTER OSCILLATOR FREQUENCY. 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 (-40°C to +125°C). 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. 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 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 DITHER MAGNITUDE DS1091LA DS1091LB 0 0 No Dither No Dither 0 1 ±1% -2% 1 0 ±2% -4% 1 1 ±4% -8% Table 2. OUTPUT FREQUENCY fOUT (MHz) n fOUT (min) fOUT (max) DR = LOGIC LEVEL 1 DR = LOGIC LEVEL 0 0.130 0.260 4 5 0.261 0.521 5 6 0.522 1.042 6 7 1.043 2.083 7 8 2.084 4.167 8 9 4.168 8.333 9 10 8.334 16.667 10 11 16.668 33.333 11 12 33.334 66.667 12 13 _____________________________________________________________________ 5 DS1091L Block Diagram Application Information IF DITHER AMOUNT = 0% fOUT PROGRAMMED fOUT+ (1%, 2%, OR 4% OF fOUT) PROGRAMMED fOUT PROGRAMMED fOUT(1%, 2%, OR 4% OF fOUT) DITHER AMOUNT (±1%, ±2%, OR ±4%) 1 DITHER FREQ 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 0.01µF and 0.1µF. 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. Requesting Custom Frequencies TIME Email [email protected] 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. DS1091L Frequency Spreading Profile as a Function of Dither % Chip Topology TRANSISTOR COUNT: 4887 SUBSTRATE CONNECTED TO GROUND Package Information For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo. IF DITHER AMOUNT = 0% PROGRAMMED fOUT DITHER AMOUNT (-2%, -4%, OR -8%) PROGRAMMED fOUT(2%, 4%, OR 8% OF fOUT) fOUT DS1091L Automotive Temperature Range Spread-Spectrum Econoscillator 1 DITHER FREQ 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 © 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. is a registered trademark of Dallas Semiconductor Corporation. Springer