Data Sheet
AD8420
Rev. 0 | Page 3 of 28
SPECIFICATIONS
+VS = +5 V, VS = 0 V, VREF = 0 V, V+IN = 0 V, VIN = 0 V, TA = 25°C, G = 1 to 1000, RL = 20 kΩ, specifications referred to input, unless
otherwise noted. All Table 2 limits are valid from VS = 3 V to VS = ±5 V, unless otherwise specified. Table 2.
Parameter
Test Conditions/Comments
Min
Typ
Max
Unit
COMMON-MODE REJECTION RATIO (CMRR)
VCM = 0 V to 2.7 V
CMRR DC to 60 Hz
100
dB
CMRR at 1 kHz
100
dB
NOISE
Voltage Noise
Spectral Density
f = 1 kHz, VDIFF ≤ 100 mV
55
nV/√Hz
Peak to Peak
f = 0.1 Hz to 10 Hz, VDIFF ≤ 100 mV
1.5
μV p-p
Current Noise
Spectral Density
f = 1 kHz
80
fA/√Hz
Peak to Peak
f = 0.1 Hz to 10 Hz
3
pA p-p
VOLTAGE OFFSET
Offset
VS = 3 V to VS = 5 V
125
μV
VS = ±5 V
150
μV
Average Temperature Coefficient
TA = 40°C to +85°C
1
μV/°C
Offset RTI vs. Supply (PSR)
VS = 2.7 V to 5 V
86
dB
INPUTS
Valid for REF and FB pair, as well
as +IN and IN
TA = +25°C
20
27
nA
TA = +85°C
24
nA
TA = 40°C
30
nA
Average Temperature Coefficient
TA = 40°C to +85°C
30
pA/°C
Input Offset Current
TA = +25°C
1
nA
TA = +85°C
1
nA
TA = 40°C
1
nA
Average Temperature Coefficient
TA = 40°C to +85°C
0.5
pA/°C
Input Impedance
Differential
130||2
MΩ||pF
Common Mode
1000||2
MΩ||pF
Differential Input Operating Voltage
TA = –40°C to +85°C
1
+1
V
Input Operating Voltage (+IN, IN, REF, or FB)
TA = +25°C
VS 0.15
+VS 2.2
V
TA = +85°C
VS 0.05
+VS 1.8
V
TA = –40°C
VS 0.2
+VS 2.7
V
DYNAMIC RESPONSE
Small Signal 3 dB Bandwidth
G = 1
250
kHz
G = 10
25
kHz
G = 100
2.5
kHz
G =1000
0.25
kHz
Settling Time 0.01%
VS = ±5 V
G = 1
1 V to +1 V output step
3
μs
G = 10
4.5 V to +4.5 V output step
130
μs
G = 100
4.5 V to +4.5 V output step
1
ms
Slew Rate
1
V/μs