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ES51999 Datasheet(PDF) 10 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) 10 Page - Cyrustek corporation

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07/07/06
10
ES51999
4 3/4 and 5 3/4 A/D AUTO
×
×
×
=
×
INT
T
DINT
REF
IN
T
V
C
Buf
dt
t
V
C
Buf
0
int
1
)
(
int
1
where,
)
(t
V
IN
= input signal
REF
V
= reference voltage
INT
T
= integration time (fixed)
DINT
T
= de-integration time (proportional to
)
(t
V
IN
)
If
)
(t
V
IN
is a constant, we can rewrite above equation:
IN
REF
INT
DINT
V
V
T
T
×
=
Besides the INT phase and DINT phase, ES51999 exploits auto zero (AZ) phase and zero
integration (ZI) phase to achieve accurate measurement. In AZ phase, the system offset is
stored. The offset error will be eliminated in DINT phase. Thus a higher accuracy could
be obtained. In ZI phase, the internal status will be recovered quickly to that of zero input.
Thus the succeeding measurements won’t be disturbed by current measurement
especially in case of overload.
input
signal
reference
voltage
Buf
Raz
Cint
integrator
output
integration
time
input signal > 0
Fixed
integration
time
Variable
deintegration
time
integration
time
input signal < 0
Fixed
integration
time
Variable
deintegration
time
fixed slope
fixed slope
different
input
different
input
Figure 2.1 the structure of dual-slope integrator and its output waveform.
As mentioned above, the measurement cycle of ES51999 contains four phases:
(1) auto zero phase (AZ)
(2) input signal integration phase (INT)
(3) reference voltage integration phase (DINT)


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