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## ES51999 Datasheet(PDF) 16 Page - Cyrustek corporation

 Part No. ES51999 Description 4 3/4 and 5 3/4 A/D AUTO Download 21 Pages Scroll/Zoom 100% Maker CYRUSTEK [Cyrustek corporation] Homepage http://www.cyrustek.com.tw Logo

## ES51999 Datasheet(HTML) 16 Page - Cyrustek corporation

 16 / 21 page 07/07/0616ES519994 3/4 and 5 3/4 A/D AUTO▪ 40Hz range:(D2+1)×106100×D0Frequency =5×(150,950+D1), Duty cycle =150950+D1%▪ 400Hz range(D2+1)×106100×D0Frequency =150,950+D1,Duty cycle =150,950+D1%▪ 4000Hz range(D2+1)×107100×D0Frequency =150,950+D1,Duty cycle =150,950+D1%▪ 40KHz to 400MHz range (D2 is not needed.)when C[0] = 0D0Frequency = 10×D1 ,Duty cycle =200%when C[0] = 1D0Frequency = D1 ,Duty cycle =200%ES51999 can measure frequency from 0.5Hz to 409.6MHz. For each range, themeasurable frequencies and resolution are shown in the following table:Range Measured frequency rangeResolutions40Hz 0.5Hz ~ 40Hz0.001Hz400Hz 2.5Hz ~ 400Hz0.01Hz4000Hz 25Hz ~ 4000Hz0.1Hz40KHz 0 ~ 40.96KHz1Hz400KHz 0 ~ 409.6KHz10Hz4MHz 0 ~ 4.096MHz100Hz40MHz 0 ~ 40.96MHz1KHz400MHz 0 ~ 409.6MHz10KHzAt 40/400/4000Hz, if the input frequency is less than its measurable range, it’s underflow,and UL will set to ‘H’. At the same ranges, if the input frequency is greater than itsmeasurable range, it’s overflow, and OL will set to ‘H’. When UL or OL occur, the dataD0, D1, and D2 will not be correct, please ignore them. At 40KHz ~ 400MHz ranges, OLand UL are always ‘L’, but it’s overflow when the output counts is 40,960.At different range, the conversion time is different. At 40/400/4000Hz, the conversiontime is according to the input frequency. At other ranges, the conversion time is fixed at110ms or 1.1s with C[0] = 0 or 1, respectively.