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LTC6930HMS8-8.00-PBF Datasheet(PDF) 9 Page - Linear Technology |
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LTC6930HMS8-8.00-PBF Datasheet(HTML) 9 Page - Linear Technology |
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9 / 12 page  LTC6930-X.XX 9 6930fa MONTHS 0 40 0.045 0.040 0.035 0.030 0.025 0.020 0.015 0.010 0.005 0 6930 F02 20 80 60 10ppm/√kHr 30ppm/√kHr 60ppm/√kHr APPLICATIONS INFORMATION state. The 2ns rise and fall times of the LTC6930 mean that the instantaneous power supply current required during the rise and fall portions of the waveform is much greater than the average. The instantaneous power supply current may be calculated by a similar formula: IC V t PEAK LOAD SWING rf = •• 1 where trf is the rise/fall time of the signal. In this case, 14mA spikes are generated by driving 5.5V into a 5pF load. Power is supplied to the output driver of the LTC6930 from the V+ and GND pins on each side of the output pin (Pins 6 and 8). Allowances must be made in the design to provide for output load related supply current spikes, especially in high accuracy applications. A 0.1μF ceramic capacitor connected between V+ and GND (Pins 6 and 8) as close as possible to the device will decouple the rest of the circuit from spikes caused by powering a capacitive output load of up to 50pF. See Figure 1. Startup Time The startup time of the LTC6930 is typically 50μs from the time that valid power is applied to the first output pulse. The output is held low for the first 50μs to prevent any glitches, runt pulses, or invalid frequency output during startup. Long-Term Drift Long-term stability of silicon oscillators is specified in ppm/√kHr, which is typical of other silicon devices such as operational amplifiers and voltage references. Because drift in silicon-based oscillators is generated primarily by movement of ions in the silicon, most of the drift is ac- complished early in the life of the device and the drift can be expected to level off in the long term. The ppm/√kHr unit models this time variant decay. Crystal oscillators are often specified with drift measured in ppm/year be- cause their drift mechanism is different. A comparison of various drift rates over a five year time period is shown in Figure 2. When calculating the amount of drift to be expected, it is important to consider the entire time in the calculation, because the relationship to time is not linear. The drift for 5 years is not 5 times the drift for one year. A sample Figure 2. 5 Year Drift at Various Rates Switching the DIV Pins The LTC6930 is designed to quickly and cleanly respond to the digital inputs. The output will respond to the DIV pins within a single clock cycle without introducing any sliver or runt pulses. 6930 F01 OUT V+ C2 0.1μF C1 0.1μF GND GND Figure 1. Recommended Layout |
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