MAX11129_12 Datasheet, PDF (27/36 Pages) Maxim Integrated Products – 3Msps, Low-Power, Serial 12-/10-Bit,8-/16-Channel ADCs

MAX11129–MAX11132
3Msps, Low-Power, Serial 12-/10-Bit,
8-/16-Channel ADCs
Table 8. Analog Input Configuration and Unipolar/Bipolar Waveforms
ANALOG INPUT
CONFIGURATION
SUPPORTED WAVEFORMS
REFSEL = 0
REFSEL = 1
UNIPOLAR/BIPOLAR
REGISTER SETTING
Single-
Ended
REF+
VIN+
RANGE: 1V - VDD
REF+
VIN+
RANGE: 1V - VDD
Table 10. Unipolar Register:
Set desired channel(s) to 0
Unipolar
REF+
REF+
(Binary
or PDIFF_COM to 1.
Coding)
1V
Counterpart Register
GND, AIN15
PDIFF_COM = 1
REF-
0V
-0.3V
Table 11. Bipolar Register:
Set desired channel(s) to 0.
Fully
Differential
Unipolar
(Binary
Coding)
VIN+
REF+ _VIN-
VIN-
REF+
RANGE: 1V - VDD
VIN+
REF+
VIN-
(DC OFFSET
VIN-
OR
(DC OFFSET
SINUSOID)
OR
GND
SINUSOID)
REF+
RANGE: 1V - VDD
1V
REF-
0V
-0.3V
Table 10. Unipolar Register:
Set desired channel(s) to 1.
Counterpart Register
Table 11. Bipolar Register:
Set desired channel(s) to 0.
Fully
Differential
Bipolar
(2’s
Complement)
VIN+
REF+
VIN-
REF+
RANGE: 1V - VDD
REF+
REF+
2
VIN+
VIN-
GND
REF+
RANGE: 1V - VDD
1V
REF-
0V
-0.3V
Table 11. Bipolar Register:
Set desired channel(s) to 1.
Counterpart Register
Table 10. Unipolar Register:
Set desired channel(s) to 0.
Table 9. ADC Output as a Function of Unipolar/Bipolar Register Settings
CHANNEL SELECTION
BIT NAME
AIN0 Selection:
CHSEL[3:0] = 0000
CHSCAN0 = 1
UNIPOLAR REGISTER
UCH0/1 PDIFF_COM
0
0
0
0
1
0
1
0
X
1
0
0
0
0
AIN1 Selection:
1
0
CHSEL[3:0] = 0001
CHSCAN1 = 1
1
0
X
1
BIPOLAR REGISTER
BCH0/1
0
1
0
1
X
0
1
0
1
X
FUNCTION
AIN0 (binary, unipolar)
AIN0/1 pair (two’s complement, bipolar)
AIN0/1 pair (binary, unipolar)
AIN0/1 pair (binary, unipolar); Unipolar register
takes precedence
AIN0 referred to REF-/AIN15 (binary, unipolar)
AIN1 (binary, unipolar)
AIN0/1 pair (two’s complement, bipolar)
AIN0/1 pair (binary, unipolar)
AIN0/1 pair (binary, unipolar), Unipolar register
takes precedence
AIN1 referred to REF-/AIN15 (binary, unipolar)
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