Data Sheet
AD8421
Rev. 0 | Page 3 of 28
SPECIFICATIONS
VS = ±15 V, VREF = 0 V, TA = 25°C, G = 1, RL = 2 kΩ, unless otherwise noted.
AR AND BR GRADES
Table 1.
AR Grade
BR Grade
Parameter
Test Conditions/
Comments
Min
Typ
Max
Min
Typ
Max
Unit
COMMON-MODE REJECTION
RATIO (CMRR)
CMRR DC to 60 Hz with 1 kΩ
Source Imbalance
VCM = 10 V to +10 V
G = 1
86
94
dB
G = 10
106
114
dB
G = 100
126
134
dB
G = 1000
136
140
dB
Over Temperature, G = 1
T = 40°C to +85°C
80
93
dB
CMRR at 20 kHz
VCM = 10 V to +10 V
G = 1
80
dB
G = 10
90
100
dB
G = 100
100
110
dB
G = 1000
110
120
dB
NOISE
VIN+, VIN = 0 V
Input Voltage Noise, eni
3
3.2
3
3.2
nV/√Hz
Output Voltage Noise, eno
60
nV/√Hz
Peak to Peak, RTI
f = 0.1 Hz to 10 Hz
G = 1
2
2.2
μV p-p
G = 10
0.5
μV p-p
G = 100 to 1000
0.07
0.09
μV p-p
Current Noise
Spectral Density
f = 1 kHz
200
fA/√Hz
Peak to Peak, RTI
f = 0.1 Hz to 10 Hz
18
pA p-p
Input Offset Voltage, VOSI
VS = ±5 V to ±15 V
60
25
μV
Over Temperature
TA = 40°C to +85°C
86
45
μV
Average TC
0.4
0.2
μV/°C
Output Offset Voltage, VOSO
350
250
μV
Over Temperature
TA = 40°C to +85°C
0.66
0.45
mV
Average TC
6
5
μV/°C
Offset RTI vs. Supply (PSR)
VS = ±2.5 V to ±18 V
G = 1
90
120
100
120
dB
G = 10
110
120
140
dB
G = 100
124
130
140
150
dB
G = 1000
130
140
150
dB
INPUT CURRENT
Input Bias Current
1
2
0.1
0.5
nA
Over Temperature
TA = 40°C to +85°C
8
6
nA
Average TC
50
pA/°C
Input Offset Current
0.5
2
0.1
0.5
nA
Over Temperature
TA = 40°C to +85°C
2.2
0.8
nA
Average TC
1
pA/°C