Datasheet

AD8221
Rev. C | Page 5 of 24
AR Grade BR Grade
Parameter Conditions Min Typ Max Min Typ Max Unit
TEMPERATURE RANGE
Specified Performance –40 +85 –40 +85 °C
Operating Range
4
–40 +125 –40 +125 °C
1
Total RTI V
OS
= (V
OSI
) + (V
OSO
/G).
2
Does not include the effects of external resistor R
G
.
3
One input grounded. G = 1.
4
See Typical Performance Characteristics for expected operation between 85°C to 125°C.
Table 2.
Parameter Conditions
ARM Grade
Unit Min Typ Max
COMMON-MODE REJECTION RATIO (CMRR)
CMRR DC to 60 Hz with 1 kΩ Source Imbalance V
CM
= −10 V to +10 V
G = 1 80 dB
G = 10 100 dB
G = 100 120 dB
G = 1000 130 dB
CMRR at 10 kHz V
CM
= –10 V to +10 V
G = 1 80 dB
G = 10 90 dB
G = 100 100 dB
G = 1000 100 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 nV/√Hz
Output Voltage Noise, e
NO
75 nV/√Hz
RTI f = 0.1 Hz to 10 Hz
G = 1 2 µV p-p
G = 10 0.5 µV p-p
G = 100 to 1000 0.25 µV p-p
Current Noise f = 1 kHz 40 fA/√Hz
f = 0.1 Hz to 10 Hz 6 pA p-p
VOLTAGE OFFSET
1
Input Offset, V
OSI
V
S
= ±5 V to ±15 V 70 µV
Over Temperature T = −40°C to +85°C 135 µV
Average TC 0.9 µV/°C
Output Offset, V
OSO
V
S
= ±5 V to ±15 V 600 µV
Over Temperature T = −40°C to +85°C 1.00 mV
Average TC 9 µV/°C
Offset RTI vs. Supply (PSR) V
S
= ±2.3 V to ±18 V
G = 1 90 100 dB
G = 10 100 120 dB
G = 100 120 140 dB
G = 1000 120 140 dB
INPUT CURRENT
Input Bias Current 0.5 2 nA
Over Temperature T = −40°C to +85°C 3 nA
Average TC 3 pA/°C
Input Offset Current 0.3 1 nA
Over Temperature T = −40°C to +85°C 1.5 nA
Average TC 3 pA/°C