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MAX1401_02 Datasheet, PDF (3/36 Pages) Maxim Integrated Products – +3V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC
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+3V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +2.7V to +3.6V, VDD = +2.7V to +3.6V, VREFIN+ = +1.25V, REFIN- = AGND, fCLKIN = 2.4576MHz, TA = TMIN to TMAX, unless
otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
OFFSET DAC
Offset DAC Range (Note 8)
Unipolar mode
Bipolar mode
-116.7
-58.35
116.7
%FSR
58.35
Offset DAC Resolution
Unipolar mode
Bipolar mode
16.7
%FSR
8.35
Offset DAC Full-Scale Error
Gain = 1, 2, 4, 8, 16, 32, 64 -2.5
Input referred
IGnapin = 128
-3.5
2.5
%FSR
3.5
Offset DAC Zero-Scale Error
0
%FSR
Additional Noise from Offset
DAC (Note 9)
DAC code = 0000
0
µVRMS
ANALOG INPUTS/REFERENCE INPUTS (Specifications for AIN and REFIN, unless otherwise noted.)
At DC
90
For filter notch 50Hz, ±0.02 · fNOTCH,
150
Common-Mode Rejection
CMR MF1 = 0, MF0 = 0, fCLKIN = 2.4576MHz (Note 10)
dB
Normal-Mode 50Hz Rejection
(Note 10)
Normal-Mode 60Hz Rejection
(Note 10)
Common-Mode Voltage Range
(Note 11)
NMR
NMR
For filter notch 60Hz, ±0.02 · fNOTCH,
150
MF1 = 0, MF0 = 0, fCLKIN = 2.4576MHz (Note 10)
For filter notch 50Hz, ±0.02 · fNOTCH,
100
MF1 = 0, MF0 = 0, fCLKIN = 2.4576MHz
For filter notch 60Hz, ±0.02 · fNOTCH,
100
MF1 = 0, MF0 = 0, fCLKIN = 2.4576MHz
REFIN and AIN for BUFF = 0
VAGND
dB
dB
V+
V
Absolute Input Voltage Range
REFIN and AIN for BUFF = 0
VAGND
- 30mV
V+
+ 30mV
V
Absolute and Common-Mode
AIN Voltage Range
BUFF = 1
VAGND
+ 200mV
V+
- 1.5
V
DC Input Leakage Current
(Note 12)
AIN Input Current (Note 12)
REFIN and AIN for
BUFF = 0
BUFF = 1
TA = +25°C
TA = TMIN to TMAX
40
pA
10
nA
10
nA
Gain = 1
34
AIN Input Capacitance
(Note 13)
BUFF = 0
Gain = 2
Gain = 4
38
45
pF
Gain = 8, 16, 32, 64, 128
60
AIN Differential Voltage Range
(Note 14)
BUFF = 1, all gains
Unipolar input range (U/B bit = 1)
Bipolar input range (U/B bit = 0)
30
0 to VREF / gain
V
±VREF / gain
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