Datasheet

AD8290
Rev. B | Page 3 of 20
SPECIFICATIONS
V
CC
= 2.6 V to 5.0 V, T
A
= 25°C, C
FILTER
= 6.8 nF, output antialiasing capacitor = 68 nF, R
SET
= 3 kΩ, common-mode input = 0.6 V, unless
otherwise noted.
Table 1.
Parameter Test Conditions Min Typ Max Unit
COMMON-MODE REJECTION RATIO (CMRR)
Input voltage (V
INP
− V
INN
)
range of 0.2 V to V
CC
− 1.7 V
CMRR DC 110 120 dB
NOISE
Amplifier and VREF Input referred, f = 0.1 Hz to 10 Hz 0.75 μV p-p
VOLTAGE OFFSET
Output Offset
Reference is internal and set to
900 mV nominal
865 900 935 mV
Output Offset TC −40°C < T
A
< +85°C −300 ±50 +300 μV/°C
PSR 120 dB
INPUT CURRENT
Input Bias Current −1000 ±100 +1000 pA
Input Offset Current −2000 ±200 +2000 pA
DYNAMIC RESPONSE
Small Signal Bandwidth –3 dB
With external filter capacitors,
C
FILTER
= 6.8 nF and output
antialiasing capacitor = 68 nF
0.25 kHz
GAIN
Gain 50 V/V
Gain Error −1.0 ±0.5 +1.0 %
Gain Nonlinearity ±0.0075 %
Gain Drift −40°C < T
A
< +85°C −25 ±15 +25 ppm/°C
INPUT
Differential Input Impedance 50||1 MΩ||pF
Input Voltage Range 0.2 V
CC
− 1.7 V
OUTPUT
Output Voltage Range
V
OUT
= Gain × (V
INP
− V
INN
) +
Output Offset
0.075 V
CC
− 0.075 V
Output Series Resistance 10 ± 20% kΩ
CURRENT EXCITATION
Excitation Current Range Excitation current = 0.9 V/R
SET
300 1300 μA
Excitation Current Accuracy −1.0 +1.0 %
Excitation Current Drift −40°C < T
A
< +85°C −250 ±50 +250 ppm/°C
External Resistor for Setting
Excitation Current (R
SET
)
692 3000 Ω
Excitation Current Power
Supply Rejection
−2.0 +0.2 +2.0 μA/V
Excitation Current Pin Voltage 0 V
CC
− 1.0 V
Excitation Current Output Resistance 100 MΩ
Required Capacitor from Ground to
Excitation Current Pin (C
BRIDGE
)
0.1 μF
ENABLE
ENBL High Level V
CC
< 2.9 V V
CC
− 0.5 V
CC
V
V
CC
> 2.9 V 2.4 V
CC
V
ENBL Low Level GND 0.8 V
Start-Up Time for ENBL 5.0 ms