general description the ds1091l is a low-cost clock generator that is factory trimmed 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). applications automotive infotainment pos terminals lcd displays printers industrial control features s spread-spectrum clock output from 130khz to 66.6mhz s -40c to +125c operating temperature range s 1.75% accuracy across temperature and voltage s factory trimmed s center-dithered (ds1091lua) or down-dithered (ds1091lub) spread-spectrum output s pin-selectable center-dither magnitude of 0%, 1%, 2%, or 4% s pin-selectable down-dither magnitude of 0%, -2%, -4%, or -8% s pin-selectable dither rate s 3.0v to 3.6v supply operation s lead(pb)-free, 8-pin max package custom frequency options custom frequency options are available. see the ordering information or contact the factory by email at custom. oscillators@maximintegrated.com for more information. 19-5768; rev 2; 9/11 ordering information appears at end of data sheet. econoscillator is a trademark and max is a registered trademark of maxim integrated products, inc. typical operating circuit for related parts and recommended products to use with this part, refer to: www.maximintegrated.com/ds1091l.related 8 3 4 2 1 out dr v cc v cc f out decoupling capacitors 7 6 5 sel0 v cc n.c. n.c. sel1 gnd v cc ds1091l ds1091l automotive temperature range spread-spectrum econoscillator? for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com.
2 voltage range on v cc relative to ground ......... -0.5v to +6.0v voltage range on dr, sel0, sel1 relativeto ground ................................ -0.5v to (v cc + 0.5v)* continuous power dissipation (t a = +70c) max (derate 4.5mw/c above +70c) ..................... 362mw operating temperature range ........................ -40c to +125c storage temperature range ............................ -55c to +125c lead temperature (soldering, 10s) ................................ +300c soldering temperature (reflow) ...................................... +260c absolute maximum ratings stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera - tion 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 (t a = -40 n c to +125 n c, unless otherwise noted.) dc electrical characteristics (v cc = +3.0v to +3.6v, t a = -40 n c to +125 n c, unless otherwise noted.) * this voltage must not exceed 6.0v. parameter symbol conditions min typ max units supply voltage v cc (note 1) 3.0 3.3 3.6 v high-level input voltage (sel0, sel1, dr) v ih 0.7 x v cc v cc + 0.3 v low-level input voltage (sel0, sel1, dr) v il -0.3 0.3 x v cc v parameter symbol conditions min typ max units high-level output voltage (out) v oh i oh = -4ma, v cc = 3.0v 2.4 v low-level output voltage (out) v ol i ol = 4ma 0.4 v high-level input current (sel0, sel1, dr) i ih v cc = 3.6v 1 f a low-level input current (sel0, sel1, dr) i il v il = 0v -1 f a supply current (active) i cc (note 2) 16 ma ds1091l automotive temperature range spread-spectrum econoscillator? maxim integrated
3 note 1: all voltages are referenced to ground. currents entering the ic are specified positive and currents exiting the ic are negative. note 2: supply current measured with c l = 15pf, v cc = 3.6v, t a = +25c, f out = 66.6mhz, no dither. note 3: no dither. note 4: guaranteed by design. note 5: for aging characteristics, contact factory. ac electrical characteristics (v cc = +3.0v to +3.6v, t a = -40 n c to +125 n c, unless otherwise noted.) typical operating characteristics (v cc = 3.3v, t a = +25c, unless otherwise noted.) parameter symbol conditions min typ max units output frequency range f out (note 3) 0.130 66.6 mhz output center frequency tolerance d f out v cc = 3.3v, t a = +25 n c -0.25 0 +0.25 % across t a and v cc -1.75 +1.75 0 n c to +70 n c, across v cc -1.2 +1.2 power-up time t pu (note 4) 0.1 ms load capacitance c l 15 50 pf duty cycle < 33.3mhz (note 3) 50 % r 33.3mhz (note 3) 40 60 jitter (rms), 50mhz 0.3 % 7.4 7.8 7.6 8.4 8.2 8.0 9.0 8.8 8.6 9.2 -40 20 -10 50 80 110 supply current vs. temperature ds1091l toc01 temperature (c) i cc (ma) v cc = 3.6v v cc = 3.3v v cc = 3.0v -1.75 -0.75 -1.25 0.25 -0.25 1.25 0.75 1.75 -40 20 50 -10 80 110 frequency variation vs. temperature ds1091l toc02 temperature (c) frequency variation (%) v cc = 3.3v no dither f out = 130khz f out = 66mhz -0.25 -0.10 -0.15 -0.20 -0.05 0.00 0.05 0.10 0.15 0.20 0.25 3.0 3.2 3.1 3.3 3.4 3.5 3.6 frequency variation vs. voltage ds1091l toc03 v cc (v) frequency variation (%) f out = 66mhz f out = 130khz no dither ds1091l automotive temperature range spread-spectrum econoscillator? maxim integrated
4 typical operating characteristics (continued) (v cc = 3.3v, t a = +25c, unless otherwise noted.) 48.0 48.5 49.0 49.5 50.0 50.5 51.0 51.5 52.0 3.0 3.2 3.1 3.3 3.4 3.5 3.6 duty cycle vs. supply voltage ds1091l toc04 v cc (v) duty cycle (%) f out = 66mhz f out = 130khz no dither 40 46 44 42 50 48 58 56 54 52 60 -40 -15 10 35 60 85 110 duty cycle vs. temperature ds1091l toc05 temperature (c) duty cycle (%) f out = 66mhz f out = 130khz no dither 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 output rise time ds1091l toc06 time (ns) output (v) rise time = 1.02ns typical at 12pf load 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 output fall time ds1091l toc07 time (ns) output (v) fall time = 1.13ns typical at 12pf load -35 -30 -25 -20 -15 -10 -5 0 5 31.9 32.9 32.4 33.4 33.9 34.4 34.9 spectrum attenuation vs. frequency at different dither amplitudes ds1091l toc08 frequency (mhz) attenuation (db) 0% 1% 2% 4% 8db 11db 14db f out = 33.3mhz rbw = 120khz center dither ds1091l automotive temperature range spread-spectrum econoscillator? maxim integrated
5 pin configuration pin description block diagram pin name function 1 out spread-spectrum clock output 2 v cc supply voltage 3 gnd ground 4 sel1 spread-spectrum dither magnitude select inputs. selects dither magnitude (see table 1 ). 5 sel0 6, 7 n.c. no connection 8 dr spread-spectrum dither rate selector. selects dither rate (see table 2 ). 1 2 3 4 8 7 6 5 dr n.c. + n.c. sel0 sel1 gnd v cc out max top view ds1091l factory-programmed master oscillator dither rate divider triangle-wave generator (dither %) factory-programmed prescaler sel0 sel1 dr out f out v cc v cc gnd f mosc is the master oscillator frequency. f mosc f dither f mosc ds1091l ds1091l automotive temperature range spread-spectrum econoscillator? maxim integrated
6 detailed description the ds1091l clock generator is capable of output fre- quencies from 130khz to 66.6mhz over the full automo- tive temperature range (-40c to +125c). the device can also produce a spread-spectrum (dithered) square- wave output using four pin-selectable dither percent- ages. both center (ds1091lua) and down (ds1091lub) 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 can 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 pro - grammed frequency (for the ds1091lub 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, f out , as well as the set - ting of the dr pin (see the equation below). figure 1a and figure 1b show a plot of the output frequency vs. time. out n f dither rate 2 = 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 = 1 and 6.6khz for dr = 0. 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 ini - tial power-up. ds1091l frequency spreading profile as a function of dither % figure 1a. center dithered figure 1b. down dithered table 1. dither magnitude table 2. value of n w.r.t. output frequency sel1 logic level sel0 logic level dither magnitude (%) ds1091lua ds1091lub 0 0 no dither no dither 0 1 q 1 -2 1 0 q 2 -4 1 1 q 4 -8 output frequency f out (mhz) n f out (min) f out (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 time 1 dither freq programmed f out + (1%, 2%, or 4% of f out ) programmed f out - (1%, 2%, or 4% of f out ) programmed f out dither amount (1%, 2%, or 4%) if dither amount = 0% f out time 1 dither freq programmed f out programmed f out - (2%, 4%, or 8% of f out ) dither amount (-2%, -4%, or -8%) if dither amount = 0% f out ds1091l automotive temperature range spread-spectrum econoscillator? maxim integrated
7 applications 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 v cc and gnd pins of the ic to minimize lead inductance. chip information substrate connected to ground package information for the latest package outline information and land patterns (foot - prints), go to www.maximintegrated.com/packages . 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. 8 max u8+1 21-0036 90-0092 ds1091l automotive temperature range spread-spectrum econoscillator? maxim integrated
8 ordering information v denotes an automotive qualified part. + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. xxx denotes factory-programmed custom frequencies. email custom.oscillators@maximintegrated.com for more information. part temp range spread spectrum output frequency (mhz) pin-package ds1091lua-027+ -40 n c to +125 n c center 27.0 8 f max ds1091lua-027+t -40 n c to +125 n c center 27.0 8 f max ds1091lua-033/v+ -40 n c to +125 n c center 33.3 8 f max ds1091lua-033/v+t -40 n c to +125 n c center 33.3 8 f max ds1091lua-033+ -40 n c to +125 n c center 33.3 8 f max ds1091lua-033+t -40 n c to +125 n c center 33.3 8 f max ds1091lua-040/v+ -40 n c to +125 n c center 40.0 8 f max ds1091lua-040/v+t -40 n c to +125 n c center 40.0 8 f max ds1091lua-040+ -40 n c to +125 n c center 40.0 8 f max ds1091lua-040+t -40 n c to +125 n c center 40.0 8 f max ds1091lua-066/v+ -40 n c to +125 n c center 66.6 8 f max ds1091lua-066/v+t -40 n c to +125 n c center 66.6 8 f max ds1091lua-066+ -40 n c to +125 n c center 66.6 8 f max ds1091lua-066+t -40 n c to +125 n c center 66.6 8 f max ds1091lua-10a/v+ -40 n c to +125 n c center 10.38 8 f max ds1091lua-10a/v+t -40 n c to +125 n c center 10.38 8 f max ds1091lua-200/v+ -40 n c to +125 n c center 0.20 8 f max ds1091lua-200/v+t -40 n c to +125 n c center 0.20 8 f max ds1091lua-200+ -40 n c to +125 n c center 0.20 8 f max ds1091lua-200+t -40 n c to +125 n c center 0.20 8 f max ds1091lua-330/v+ -40 n c to +125 n c center 33.0 8 f max ds1091lua-330/v+t -40 n c to +125 n c center 33.0 8 f max ds1091lua-330+ -40 n c to +125 n c center 33.0 8 f max ds1091lua-330+t -40 n c to +125 n c center 33.0 8 f max ds1091lua-xxx+ -40 n c to +125 n c center custom (contact factory) 8 f max ds1091lub-008+t -40 n c to +125 n c down 8.0 8 f max ds1091lub-027+ -40 n c to +125 n c down 27.0 8 f max ds1091lub-027+t -40 n c to +125 n c down 27.0 8 f max ds1091lub-033+ -40 n c to +125 n c down 33.3 8 f max ds1091lub-033+t -40 n c to +125 n c down 33.3 8 f max ds1091lub-066+ -40 n c to +125 n c down 66.6 8 f max ds1091lub-066+t -40 n c to +125 n c down 66.6 8 f max DS1091LUB-XXX+ -40 n c to +125 n c down custom (contact factory) 8 f max ds1091l automotive temperature range spread-spectrum econoscillator? maxim integrated
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. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 9 ? 2012 maxim integrated products, inc. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. revision history revision number revision date description pages changed 0 9/06 initial release 1 3/11 added the continuous power dissipation numbers, lead temperature, and soldering tem - perature to the absolute maximum ratings section; updated the custom frequency tech - nical support information; updated the ordering information table; added the land pattern no. to the package information table 1, 2, 7 2 9/11 updated the ordering information table 7 ds1091l automotive temperature range spread-spectrum econoscillator?
|
