Datasheet

AD8220
Rev. B | Page 5 of 28
A Grade B Grade W Grade
Parameter Test Conditions Min Typ Max Min Typ Max Min Typ Max Unit
POWER SUPPLY V
Operating Range ±2.25
4
±18
±2.25
4
±18 ±2.25
4
±18 μA
Quiescent Current T
A
750 750 750 μA
Over Temperature T
OPR
850 850 1000 μA
TEMPERATURE RANGE
For Specified
Performance
T
OPR
−40 +85 −40 +85 −40 +125 °C
1
When the output sinks more than 4 mA, use a 47 pF capacitor in parallel with the load to prevent ringing. Otherwise, use a larger load, such as 10 kΩ.
2
Differential and common-mode input impedance can be calculated from the pin impedance: Z
DIFF
= 2(Z
PIN
); Z
CM
= Z
PIN
/2.
3
The AD8220 can operate up to a diode drop below the negative supply but the bias current increases sharply. The input voltage range reflects the maximum
allowable voltage where the input bias current is within the specification.
4
At this supply voltage, ensure that the input common-mode voltage is within the input voltage range specification.
V
S
+ = 5 V, V
S
− = 0 V, V
REF
= 2.5 V, T
A
= 25°C, T
OPR
= −40°C to +85°C for A and B grades. T
OPR
= −40°C to +125°C for W grade, G = 1,
R
L
= 2 kΩ
1
, unless otherwise noted.
Table 2.
A Grade B Grade W Grade
Parameter Test Conditions Min Typ Max Min Typ Max Min Typ Max Unit
COMMON-MODE REJECTION
RATIO (CMRR)
T
A
for A, B grades,
T
OPR
for W grade
CMRR DC to 60 Hz with
1 kΩ Source Imbalance
V
CM
= 0 to 2.5 V
G = 1 78 86 77 dB
G = 10 94 100 92 dB
G = 100 94 100 92 dB
G = 1000 94 100 92 dB
CMRR at 5 kHz V
CM
= 0 to 2.5 V
G = 1 74 80 72 dB
G = 10 84 90 80 dB
G = 100 84 90 80 dB
G = 1000 84 90 80 dB
NOISE RTI noise = √(e
ni
2
+
(e
no
/G)
2
), T
A
Voltage Noise, 1 kHz V
S
= ±2.5 V
Input Voltage Noise, e
ni
V
IN
+, V
IN
− = 0 V, V
REF
=
0 V
14 14 17 14 nV/√Hz
Output Voltage Noise, e
no
V
IN
+, V
IN
− = 0 V, V
REF
=
0 V
90 90 100 90 nV/√Hz
RTI, 0.1 Hz to 10 Hz
G = 1 5 5 5 μV p-p
G = 1000 0.8 0.8 0.8 μV p-p
Current Noise f = 1 kHz 1 1 1 fA/√Hz
VOLTAGE OFFSET V
OS
= V
OSI
+ V
OSO
/G
Input Offset, V
OSI
T
A
−300 +300 −200 +200 −300 +300 μV
Average TC T
OPR
−10 +10 −5 +5 −10 10 μV/°C
Output Offset, V
OSO
T
A
−800 +800 −600 +600 −800 +800 μV
Average TC T
OPR
−10 +10 −5 +5 −10 +10 μV/°C
Offset RTI vs. Supply (PSR) T
A
for A, B grades,
T
OPR
for W grade
G = 1 86 86 80 dB
G = 10 96 100 92 dB
G = 100 96 100 92 dB
G = 1000 96 100 92 dB