Datasheet

MAX110/MAX111
Low-Cost, 2-Channel, ±14-Bit Serial ADCs
16 ______________________________________________________________________________________
X = Don't Care
Table 3. Procedure to Calibrate the ADC
0010
0
or
1
00XX
No
Change
001
Performs an offset-null conversion with the
internal ADC inputs shorted to the selected
input channel's negative input (IN1- or IN2-).
The next operation performs the first signal
conversion with the new setup.
3
0001X00XX
No
Change
001
Performs a gain-calibration conversion with
the null register contents as the starting value.
The result is stored in the calibration register.
2
0011X00XX
New
Data
001
Sets the new conversion speed (if required)
and performs an offset correction conversion
with the internal ADC inputs shorted to REF-.
The result is stored in the null register.
(This step also selects the speed/resolution
for the ADC.)
1
PD
PDXNULCALCHS
Not
Used
DV2 &
DV4
CONV1-
CONV4
Not
Used
NNOO--OOPP
DESCRIPTIONSTEP
CONTROL WORD
X = Don't Care
Table 2. Allowable Input Multiplexer Configurations
Input control word is not transferred to the control register. ADC
configuration remains unchanged and no new conversion starts when CS
returns high.
No
Change
No
Change
0XXX
REF+ and REF- connected to the ADC inputs; gain-calibration mode
selected. Autocal conversion begins when CS returns high, and the results are
stored in the 16-bit I/O register.
REF-REF+1X01
REF- connected to the ADC inputs; offset-null mode selected. Autonull conversion
begins when CS returns high, and the results are stored in the null register.
REF-REF-1X11
IN2- connected to the ADC inputs; offset-null mode selected. Autonull conversion
begins when CS returns high, and the results are stored in the null register.
IN2-IN2-1110
IN1- connected to the ADC inputs; offset-null mode selected. Autonull conversion
begins when CS returns high, and the results are stored in the null register.
IN1-IN1-1010
Channel 2 connected to ADC inputs. Conversion begins when CS returns high.
IN2-IN2+1100
Channel 1 connected to ADC inputs. Conversion begins when CS returns high.
IN1-IN1+1000
DESCRIPTIONADC IN-ADC IN+
NNOO--OOPP
CHSNULCAL