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| MAX1400_02 Datasheet, PDF (3/34 Pages) Maxim Integrated Products – +5V, 18-Bit, Low-Power, Multichannel, Oversampling (Sigma-Delta) ADC | |||
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+5V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +5V ±5%, VDD = +2.7V to +5.25V, VREFIN+ = +2.50V, REFIN- = AGND, fCLKIN = 2.4576MHz, TA = TMIN to TMAX, unless other-
wise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
OFFSET DAC
Offset DAC Range (Note 6)
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
Gain = 128
-3.5
+2.5
+3.5
%FSR
Offset DAC Zero-Scale Error
0
%FSR
Additional Noise from Offset
DAC
DAC code = 0000 (Note 7)
0
µVRMS
ANALOG INPUTS/REFERENCE INPUTS (Specifications for AIN and REFIN, unless otherwise noted.)
At DC
90
Common-Mode Rejection
CMR
For filter notch 50Hz, ±0.02 â fNOTCH,
MF1 = 0, MF0 = 0, fCLKIN = 2.4576MHz (Note 8)
150
dB
For filter notch 60Hz, ±0.02 â fNOTCH,
150
MF1 = 0, MF0 = 0, fCLKIN = 2.4576MHz (Note 8)
For filter notch 50Hz, ±0.02 â fNOTCH,
Normal Mode 50Hz Rejection
NMR MF1 = 0, MF0 = 0, fCLKIN = 2.4576MHz
100
dB
(Note 8)
For filter notch 60Hz, ±0.02 â fNOTCH,
Normal Mode 60Hz Rejection
NMR MF1 = 0, MF0 = 0, fCLKIN = 2.4576MHz
100
dB
Normal Mode 60Hz Rejection
NMR F(Noor tfeilt8e)r notch 60Hz, ±0.02 â fNOTCH,
100
dB
Common-Mode Voltage Range
REFIN and AIN for BUFF = 0 (Note 9)
VAGND
V+
V
Absolute Voltage Range Input
Absolute and Common-Mode
AIN Voltage Range
DC Input Leakage Current
(Note 10)
AIN Input Current
AIN Input Capacitance
(Note 11)
AIN Differential Voltage Range
(Note 12)
REFIN and AIN for BUFF = 0
VAGND
- 30mV
V+
+ 30mV
V
BUFF = 1
VAGND
+ 200mV
V+
- 1.5
V
REFIN and AIN for
BUFF = 0
TA = +25°C
TA = TMIN to TMAX
40
pA
10
nA
BUFF = 1 (Note 10)
10
nA
Gain = 1
34
BUFF = 0
Gain = 2
Gain = 4
38
45
pF
Gain = 8, 16, 32, 64, 128
60
BUFF = 1, all gains
30
Unipolar input range (U/B bit = 1)
Bipolar input range (U/B bit = 0)
0 to VREF /
gain
V
±VREF /
gain
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