ES51993
11,000 Counts ADC
Besides the INT phase and DINT phase, ES51993 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.
As mentioned above, the measurement cycle of ES51993 contains four phases:
(1) auto zero phase (AZ)
(2) input signal integration phase (INT)
(3) reference voltage integration phase (DINT)
(4) zero integration phase (ZI)
The time ratios of these four phases, AZ, INT, DINT and ZI to the entire
measurement cycle are 8.8%, 32%, 35.2% and 24% respectively. However the actual
duration of each phase depends on conversion rate. An example is shown in the table
below. A user can easily deduce other cases based on the table.
Voltage:
CR (times/sec)
ZI (ms)
AZ (ms) INT (ms) DINT (ms)
8
Voltge+PEAK:
CR (times/sec)
30
11
40
44
Note: reference voltage = -100 mV.
ZI (ms)
AZ (ms) INT (ms) DINT (ms)
8
30
11
40
60
Note: reference voltage = -100 mV.
5
06/09/20
CYRUSTEK [ Cyrustek corporation ]
