Data Sheet AD8428
Rev. A | Page 3 of 20
SPECIFICATIONS
V
S
= ±15 V, V
REF
= 0 V, T
A
= 25°C, G = 2000, R
L
= 10 k, unless otherwise noted.
Table 2.
Test Conditions/ A Grade B Grade
Parameter Comments Min Typ Max Min Typ Max Unit
COMMON-MODE REJECTION RATIO
(CMRR)
RTI, V
CM
= ±10 V
DC to 60 Hz 130 140 dB
At 50 kHz 110 120 dB
NOISE (RTI) V
IN
+, V
IN
− = 0 V
Voltage Noise f = 1 kHz 1.3 1.5 1.3 1.5 nV/√Hz
f = 0.1 Hz to 10 Hz 40 50 40 50 nV p-p
Current Noise f = 1 kHz 1.5 1.5 pA/√Hz
f = 0.1 Hz to 10 Hz 150 150 pA p-p
VOLTAGE OFFSET
Input Offset, V
OSI
100 25 μV
Average TC T
A
= −40°C to +85°C 1 0.3 μV/°C
Offset RTI vs. Supply (PSRR) 120 130 dB
INPUT CURRENT
Input Bias Current 200 50 nA
Over Temperature T
A
= −40°C to +85°C 250 250 pA/°C
Input Offset Current 50 10 nA
Over Temperature T
A
= −40°C to +85°C 20 20 pA/°C
DYNAMIC RESPONSE
−3 dB Small Signal Bandwidth 3.5 3.5 MHz
Settling Time to 0.01% 10 V step 0.75 0.75 μs
Settling Time to 0.001% 10 V step 1.4 1.4 μs
Slew Rate 40 50 40 50 V/μs
GAIN
First Stage Gain 200 200 V/V
Subtractor Stage Gain 10 10 V/V
Total Gain Error V
OUT
= −10 V to +10 V 0.2 0.05 %
Total Gain Nonlinearity V
OUT
= −10 V to +10 V 5 5 ppm
Gain Drift 10 5 ppm/°C
INPUT
Impedance (Pin to Ground)
1
1||2 1||2 GΩ||pF
Input Operating Voltage Range V
S
= ±4 V to ±18 V −V
S
+ 2.5 +V
S
− 2.5 −V
S
+ 2.5 +V
S
− 2.5 V
Over Temperature T
A
= −40°C to +85°C −V
S
+ 2.5 +V
S
− 2.5 −V
S
+ 2.5 +V
S
− 2.5 V
OUTPUT
Output Voltage Swing R
L
= 2 kΩ −V
S
+ 1.7 +V
S
− 1.2 −V
S
+ 1.7 +V
S
− 1.2 V
Over Temperature T
A
= −40°C −V
S
+ 2.0 +V
S
− 1.3 −V
S
+ 2.0 +V
S
− 1.3 V
T
A
= +85°C −V
S
+ 1.6 +V
S
− 1.1 −V
S
+ 1.6 +V
S
− 1.1 V
Output Voltage Swing R
L
= 10 kΩ −V
S
+ 1.7 +V
S
− 1.0 −V
S
+ 1.7 +V
S
− 1.0 V
Over Temperature T
A
= −40°C −V
S
+ 1.8 +V
S
− 1.2 −V
S
+ 1.8 +V
S
− 1.2 V
T
A
= +85°C −V
S
+ 1.4 +V
S
− 0.9 −V
S
+ 1.4 +V
S
− 0.9 V
Short-Circuit Current 30 30 mA
REFERENCE INPUT
Input Impedance, R
IN
132 132 kΩ
Input Current, I
IN
V
IN
+, V
IN
− = 0 V 6.5 6.5 μA
Voltage Range −V
S
+V
S
−V
S
+V
S
V
Reference Gain to Output 1 1 V/V
Reference Gain Error 0.01 0.01 %
