Data Sheet
AD8218
Rev. B | Page 3 of 16
SPECIFICATIONS
T
OPR
= 40癈 to +125癈, T
A
= 25癈, R
L
= 25 k& (R
L
is the output load resistor), input common-mode voltage (V
CM
) = 4 V, unless
otherwise noted.
Table 1.
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
GAIN
Initial
20
V/V
Accuracy
?.1
%
V
O
e 0.1 V dc, T
A
Accuracy over Temperature
?.35
%
TOPR
Gain vs. Temperature
?
ppm/癈 T
OPR
VOLTAGE OFFSET
Offset Voltage (RTI
1
)
?00
礦
25癈
Over Temperature (RTI
1
)
?00
礦
TOPR
Offset Drift
?00
nV/癈
T
OPR
INPUT
Bias Current
2
130
礎
T
A
, input common mode = 4 V, V
S
= 4 V
220
礎
TOPR, input common mode = 4 V, VS = 4 V
Common-Mode Input Voltage Range
4
80
V
Common-mode continuous
Differential Input Voltage Range
3
0
250
mV
Differential input voltage
Common-Mode Rejection (CMRR)
90
110
dB
TOPR
OUTPUT
Output Voltage Range Low
0.01
V
Output Voltage Range High
VS 0.1 V
TA
Out ut Im edance
2
&
INTERNAL REFERENCE (ENB PIN CONNECTED TO GND)
Initial Value
80
mV
Voltage at OUT with a differential input of
V n
mm n-m
in
f4V
Offset (RTI
1
)
150
+150
礦
Offset Drift (RTO
4
)
?0
礦/癈
V
S
= NC or V
S
= 5 V
REFERENCE INPUT (REF, PIN 7)
Input Impedance
1.5
M&
Input Current
3
60
礎
Dependent on V
REF
/1.5 M&
Input Voltage Range
0
5
V
ENB not connected to GND
Input-to-Output Gain
1 ?0.0001
V/V
DYNAMIC RESPONSE
Small-Signal 3 dB Bandwidth
450
kHz
Slew Rate
1
V/祍
NOISE
0.1 Hz to 10 Hz (RTI
1
)
2.3
礦 p-p
Spectral Density, 1 kHz (RTI
1
)
110
nV/Hz
POWER SUPPLY
Operating Range (Pin 2 Floating)
4
80
V
Power regulated from common mode,
VS pin floating
V
S
Range (Pin 2)
4
5.5
V
V
S
must be less than 5.5 V if standalone
supply is used
Quiescent Current over Tem erature
800
A
Throu hout in ut common mode
Power Supply Rejection Ratio (PSRR)
90
110
dB
T
OPR
TEMPERATURE RANGE
For Specified Performance
40
+125
癈
1
RTI = referred to input.
2
Refer to Figure 9 for more information on the input bias current. This current varies based on the input common-mode voltage. The input bias current flowing to the
+IN pin is also the supply current to the internal LDO.
3
The differential input voltage is specified as 250 mV because the output is internally clamped to 5.2 V. This ensures that the output voltage does not exceed the typical
ADC input range, preventing damage. The AD8218 can survive up to ? V differentially but will only amplify ~250 mV correctly due to the output clamping function.
4
RTO = referred to output.
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