AD8231
Rev. B | Page 3 of 24
SPECIFICATIONS
VS = 5 V, VREF = 2.5 V, G = 1, RL = 10 kΩ, TA = 25°C, unless otherwise noted.
Table 2.
Parameter
Conditions
Min
Typ
Max
Unit
INSTRUMENTATION AMPLIFIER
Offset Voltage
VOS RTI = VOSI + VOSO/G
Input Offset, VOSI
4
15
μV
Average Temperature Drift
TA = 40°C to +125°C
0.01
0.05
μV/°C
Output Offset, VOSO
15
30
μV
Average Temperature Drift
TA = 40°C to +125°C
0.05
0.5
μV/°C
Input Currents
Input Bias Current
250
500
pA
TA = 40°C to +125°C
5
nA
Input Offset Current
20
100
pA
TA = 40°C to +125°C
0.5
nA
Gains
1, 2, 4, 8, 16, 32, 64, or 128
Gain Error
G = 1
0.05
%
G = 2 to 128
0.8
%
Gain Drift
TA = 40°C to +125°C
G = 1 to 32
3
10
ppm/°C
G = 64
4
20
ppm/°C
G = 128
10
30
ppm/°C
Linearity
0.2 V to 4.8 V, 10 kΩ load
3
ppm
0.2 V to 4.8 V, 2 kΩ load
5
ppm
CMRR
G = 1
80
dB
G = 2
86
dB
G = 4
92
dB
G = 8
98
dB
G = 16
104
dB
G = 32
110
dB
G = 64
110
dB
G = 128
110
dB
Noise
en = √(eni2 + (eno/G)2), VIN+, VIN = 2.5 V
Input Voltage Noise, eni
f = 1 kHz
32
nV/√Hz
f = 1 kHz, TA = 40°C
27
nV/√Hz
f = 1 kHz, TA = 125°C
39
nV/√Hz
f = 0.1 Hz to 10 Hz
0.7
μV p-p
Output Voltage Noise, eno
f = 1 kHz
58
nV/√Hz
f = 1 kHz, TA = 40°C
50
nV/√Hz
f = 1 kHz, TA = 125°C
70
nV/√Hz
f = 0.1 Hz to 10 Hz
1.1
μV p-p
Current Noise
f = 10 Hz
20
fA/√Hz
Other Input Characteristics
Common-Mode Input Impedance
10||5
GΩ||pF
Power Supply Rejection Ratio
100
115
dB
Input Operating Voltage Range
0.05
4.95
V
Reference Input
Input Impedance
28
kΩ
Voltage Range
0.2
+5.2
V