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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
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Maker  CYRUSTEK [Cyrustek corporation]
Homepage  http://www.cyrustek.com.tw
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ES51999 Datasheet(HTML) 16 Page - Cyrustek corporation

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07/07/06
16
ES51999
4 3/4 and 5 3/4 A/D AUTO
▪ 40Hz range:
(D2+1)×106
100×D0
Frequency =
5×(150,950+D1)
, Duty cycle =
150950+D1
%
▪ 400Hz range
(D2+1)×106
100×D0
Frequency =
150,950+D1
,
Duty cycle =
150,950+D1
%
▪ 4000Hz range
(D2+1)×107
100×D0
Frequency =
150,950+D1
,
Duty cycle =
150,950+D1
%
▪ 40KHz to 400MHz range (D2 is not needed.)
when C[0] = 0
D0
Frequency = 10×D1 ,
Duty cycle =
200
%
when C[0] = 1
D0
Frequency = D1 ,
Duty cycle =
200
%
ES51999 can measure frequency from 0.5Hz to 409.6MHz. For each range, the
measurable frequencies and resolution are shown in the following table:
Range Measured frequency range
Resolutions
40Hz 0.5Hz ~ 40Hz
0.001Hz
400Hz 2.5Hz ~ 400Hz
0.01Hz
4000Hz 25Hz ~ 4000Hz
0.1Hz
40KHz 0 ~ 40.96KHz
1Hz
400KHz 0 ~ 409.6KHz
10Hz
4MHz 0 ~ 4.096MHz
100Hz
40MHz 0 ~ 40.96MHz
1KHz
400MHz 0 ~ 409.6MHz
10KHz
At 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 its
measurable range, it’s overflow, and OL will set to ‘H’. When UL or OL occur, the data
D0, D1, and D2 will not be correct, please ignore them. At 40KHz ~ 400MHz ranges, OL
and 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 conversion
time is according to the input frequency. At other ranges, the conversion time is fixed at
110ms or 1.1s with C[0] = 0 or 1, respectively.


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