Rainbow Electronics MAX1400 - Manual (Page 3)

MAX1400
+5V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
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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
UNITS MIN TYP MAX SYMBOL PARAMETER
%FSR
-58.35 58.35
Offset DAC Range (Note 6)
Input referred %FSR -2.5 2.5 Offset DAC Full-Scale Error
For filter notch 50Hz, ±0.02 · f NOTCH ,
MF1 = 0, MF0 = 0, f CLKIN = 2.4576MHz (Note 8)
DAC code = 0000
For filter notch 50Hz, ±0.02 · f NOTCH ,
MF1 = 0, MF0 = 0, f CLKIN = 2.4576MHz
150
dB 100 NMR
Normal Mode 50Hz Rejection
(Note 8)
At DC
µV RMS 0
Additional Noise from Offset
DAC (Note 7)
90
REFIN and AIN for BUFF = 0 V V AGND V+
Common-Mode Voltage Range
(Note 9)
BUFF = 1
BUFF = 1 10 AIN Input Current (Note 10) nA
V
V AGND V+
+ 200mV - 1.5
Absolute and Common-Mode
AIN Voltage Range
pA 40 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
CMR Common-Mode Rejection
For filter notch 60Hz, ±0.02 · f NOTCH ,
MF1 = 0, MF0 = 0, f CLKIN = 2.4576MHz
dB 100 NMR
Normal Mode 60Hz Rejection
(Note 8)
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
%FSR 0 Offset DAC Zero-Scale Error
OFFSET DAC
ANALOG INPUTS/REFERENCE INPUTS (Specifications for AIN and REFIN, unless otherwise noted.)