Datasheet
Normal Mode 60Hz Rejection NMR 100 dB
For filter notch 60Hz, ±0.02
✕
f
NOTCH
,
MAX1400
+5V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
________________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +5V ±5%, V
DD
= +2.7V to +5.25V, V
REFIN+
= +2.50V, REFIN- = AGND, f
CLKIN
= 2.4576MHz, T
A
= T
MIN
to T
MAX
, unless other-
wise noted. Typical values are at T
A
= +25°C.)
Unipolar mode
CONDITIONS
-116.7 +116.7
Bipolar mode
UNITSMIN TYP MAXSYMBOLPARAMETER
%FSR
-58.35 +58.35
Offset DAC Range (Note 6)
-2.5 +2.5
For filter notch 50Hz, ±0.02
✕
f
NOTCH
,
MF1 = 0, MF0 = 0, f
CLKIN
= 2.4576MHz (Note 8)
DAC code = 0000 (Note 7)
For filter notch 50Hz, ±0.02
✕
fNOTCH,
MF1 = 0, MF0 = 0, fCLKIN = 2.4576MHz
(Note 8)
150
dB100NMRNormal Mode 50Hz Rejection
At DC
µV
RMS
0
Additional Noise from Offset
DAC
90
REFIN and AIN for BUFF = 0 (Note 9) VV
AGND
V+Common-Mode Voltage Range
BUFF = 1
BUFF = 1 (Note 10) 10AIN Input Current nA
V
V
AGND
V+
+ 200mV - 1.5
Absolute and Common-Mode
AIN Voltage Range
pA40
DC Input Leakage Current
(Note 10)
Unipolar mode 16.7
Bipolar mode
%FSR
8.35
Offset DAC Resolution
For filter notch 60Hz, ±0.02
✕
f
NOTCH
,
MF1 = 0, MF0 = 0, f
CLKIN
= 2.4576MHz (Note 8)
dB
150
CMRCommon-Mode Rejection
For filter notch 60Hz, ±0.02
✕
f
NOTCH
,
MF1 = 0, MF0 = 0, f
CLKIN
= 2.4576MHz
(Note 8)
dB100NMRNormal Mode 60Hz Rejection
REFIN and AIN for BUFF = 0 V
V
AGND
V+
- 30mV + 30mV
Absolute Voltage Range Input
REFIN and AIN for
BUFF = 0
T
A
= +25°C
T
A
= T
MIN
to T
MAX
10 nA
34
38
45
BUFF = 0
60
BUFF = 1, all gains 30
AIN Input Capacitance
(Note 11)
pF
Bipolar input range (U/B bit = 0)
±V
REF
/
gain
AIN Differential Voltage Range
(Note 12)
V
Gain = 1
Gain = 2
Gain = 4
Gain = 8, 16, 32, 64, 128
Unipolar input range (U/B bit = 1)
0 to V
REF
/
gain
%FSR0Offset DAC Zero-Scale Error
Input referred %FSR
-3.5 +3.5
Offset DAC Full-Scale Error
Gain = 1, 2, 4, 8, 16, 32, 64
Gain = 128
OFFSET DAC
ANALOG INPUTS/REFERENCE INPUTS (Specifications for AIN and REFIN, unless otherwise noted.)