Datasheet

AD8221
Rev. C | Page 3 of 24
SPECIFICATIONS
V
S
= ±15 V, V
REF
= 0 V, T
A
= 25°C, G = 1, R
L
= 2 kΩ, unless otherwise noted.
Table 1.
AR Grade BR Grade
Parameter Conditions Min Typ Max Min Typ Max Unit
COMMON-MODE REJECTION RATIO
CMRR DC to 60 Hz with 1 kΩ
Source Imbalance
V
CM
= −10 V to +10 V
G = 1 80 90 dB
G = 10 100 110 dB
G = 100 120 130 dB
G = 1000 130 140 dB
CMRR at 10 kHz V
CM
= −10 V to +10 V
G = 1 80 80 dB
G = 10 90 100 dB
G = 100 100 110 dB
G = 1000 100 110 dB
NOISE
RTI noise =
√
e
NI
2
+ (e
NO
/G)
2
Voltage Noise, 1 kHz
Input Voltage Noise, e
NI
V
IN+
, V
IN−
, V
REF
= 0 8 8 nV/√Hz
Output Voltage Noise, e
NO
75 75 nV/√Hz
RTI f = 0.1 Hz to 10 Hz
G = 1 2 2 μV p-p
G = 10 0.5 0.5 μV p-p
G = 100 to 1000 0.25 0.25 μV p-p
Current Noise f = 1 kHz 40 40 fA/√Hz
f = 0.1 Hz to 10 Hz 6 6 pA p-p
VOLTAGE OFFSET
1
Input Offset, V
OSI
V
S
= ±5 V to ±15 V 60 25 μV
Over Temperature T = −40°C to +85°C 86 45 μV
Average TC 0.4 0.3 μV/°C
Output Offset, V
OSO
V
S
= ±5 V to ±15 V 300 200 μV
Over Temperature T = −40°C to +85°C 0.66 0.45 mV
Average TC 6 5 μV/°C
Offset RTI vs. Supply (PSR) V
S
= ±2.3 V to ±18 V
G = 1 90 110 94 110 dB
G = 10 110 120 114 130 dB
G = 100 124 130 130 140 dB
G = 1000 130 140 140 150 dB
INPUT CURRENT
Input Bias Current 0.5 1.5 0.2 0.4 nA
Over Temperature T = −40°C to +85°C 2.0 1 nA
Average TC 1 1 pA/°C
Input Offset Current 0.2 0.6 0.1 0.4 nA
Over Temperature T = −40°C to +85°C 0.8 0.6 nA
Average TC 1 1 pA/°C
REFERENCE INPUT
R
IN
20 20 kΩ
I
IN
V
IN+
, V
IN−
, V
REF
= 0 50 60 50 60 μA
Voltage Range –V
S
+V
S
–V
S
+V
S
V
Gain to Output 1 ± 0.0001 1 ± 0.0001 V/V