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ISL26132, ISL26134
16
FN6954.1
September 9, 2011
Offset Calibration Control
The offset internal to the ADC can be removed by performing an
offset calibration operation. Offset calibration can be initiated
immediately after reading a conversion word with 24 SCLKs by
issuing two additional SCLKs. The offset calibration operation will
begin immediately after the 26th SCLK occurs. Figure 32
illustrates the timing details for the offset calibration operation.
During offset calibration, the analog inputs are shorted internally
and a regular conversion is performed. This conversion generates
a conversion word that represents the offset error. This value is
stored and used to digitally remove the offset error from future
conversion words. The SDO/RDY output will fall to indicate the
completion of the offset calibration operation.
TABLE 10. INTERFACE TIMING CHARACTERISTICS
PARAMETER
DESCRIPTION
MIN
TYP
MAX
UNITS
t2
SDO/RDY Low to first SLK
0
ns
t3
SCLK pulsewidth, Low or High
100
ns
t4
SCLK High to Data Valid
50
ns
t5
Data Hold after SCLK High
0
ns
t6
Register Update Time
39
s
t7
Conversion Period
SPEED = 1
12.5
ms
SPEED = 0
100
ms
FIGURE 31. OUTPUT DATA WAVEFORMS FOR SDO/RDY POLLING
NEW DATA READY
DATA READY
SDO/RDY
SCLK
23
22
21
0
24
1
25
DATA
25TH SCLK FORCES
SDO/RDY HIGH
FIGURE 32. OFFSET CALIBRATION WAVEFORMS
DATA READY AFTER CALIBRATION
CALIBRATION BEGINS
SDO/RDY
SCLK
23
22
21
0
23
24
25
26
1
t8
FIGURE 33. STANDBY MODE WAVEFORMS
DATA READY
START
CONVERSION
STANDBY MODE
SDO/RDY
SCLK
23
22
21
0
1
24
t11
t10
t9
23
TABLE 11. SDO/RDY DELAY AFTER CALIBRATION
PARAMETER
MIN
MAX
UNITS
t8
SPEED = 1
108
109
ms
SPEED = 0
808
809
ms
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