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DS1091LUA-330+T Datasheet(PDF) 6 Page - Maxim Integrated Products |
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DS1091LUA-330+T Datasheet(HTML) 6 Page - Maxim Integrated Products |
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6 / 9 page  DS1091L Automotive Temperature Range Spread-Spectrum EconOscillator™ 6 Maxim Integrated Detailed Description The DS1091L clock generator is capable of output fre- quencies from 130kHz to 66.6MHz over the full automo- tive temperature range (-40°C to +125°C). 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, fOUT, 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 tPU 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 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 TIME 1 DITHER FREQ PROGRAMMED fOUT+ (1%, 2%, OR 4% OF fOUT) PROGRAMMED fOUT- (1%, 2%, OR 4% OF fOUT) PROGRAMMED fOUT DITHER AMOUNT (±1%, ±2%, OR ±4%) IF DITHER AMOUNT = 0% TIME 1 DITHER FREQ PROGRAMMED fOUT PROGRAMMED fOUT- (2%, 4%, OR 8% OF fOUT) DITHER AMOUNT (-2%, -4%, OR -8%) IF DITHER AMOUNT = 0% |
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