Part: AD8221, Analog Devices

Type: Precision Instrumentation Amplifier

Description: The AD8221 is a gain programmable, high performance instrumentation amplifier with a gain range of 1 to 1000, delivering 80 dB minimum CMRR to 10 kHz (G=1), 825 kHz bandwidth (G=1), and operating from ±2.3 V to ±18 V supplies.

Operating Conditions:

• Supply voltage: ±2.3 V to ±18 V
• Operating temperature: -40°C to +85°C (for specified performance)
• Gain range: 1 to 1000

Absolute Maximum Ratings:

• Max supply voltage: ±18 V
• Max junction/storage temperature: -65°C to +150°C

Key Specs:

• CMRR DC to 60 Hz (G=1, VCM = -10 V to +10 V): 80 dB min
• CMRR at 10 kHz (G=1, VCM = -10 V to +10 V): 80 dB min
• Input Voltage Noise, eNI (1 kHz): 8 nV/√Hz max
• Input Offset, VOSI (VS = ±5 V to ±15 V): 60 μV max
• Input Offset Average TC: 0.4 μV/°C max
• Input Bias Current: 1.5 nA max
• Small Signal –3 dB Bandwidth (G=1): 825 kHz typ
• Slew Rate (G=1): 1.5 V/μs min, 2 V/μs typ

Features:

• Easy to use
• Available in space-saving MSOP
• Gain set with 1 external resistor (gain range 1 to 1000)
• Wide power supply range: ±2.3 V to ±18 V
• Temperature range for specified performance: -40°C to +85°C (Operational up to 125°C)
• Excellent AC specifications (80 dB min CMRR to 10 kHz (G=1), 825 kHz -3 dB bandwidth (G=1), 2 V/μs slew rate)
• Low noise (8 nV/√Hz @ 1 kHz max input voltage noise, 0.25 μV p-p input noise (0.1 Hz to 10 Hz))
• High accuracy dc performance (AD8221BR

Easy to use Available in space-saving MSOP

Gain set with 1 external resistor (gain range 1 to 1000)

Wide power supply range: ±2.3 V to ±18 V

Temperature range for specified performance:

-40°C to +85°C

Operational up to 125°C1

Excellent AC specifications

80 dB minimum CMRR to 10 kHz (G = 1)

825 kHz, -3 dB bandwidth (G = 1)

2 V/μs slew rate

Low noise

8 nV/√Hz, @ 1 kHz, maximum input voltage noise

0.25 μV p-p input noise (0.1 Hz to 10 Hz)

High accuracy dc performance (AD8221BR)

90 dB minimum CMRR (G = 1)

25 μV maximum input offset voltage

0.3 μV/°C maximum input offset drift

0.4 nA maximum input bias current

Weigh scales Industrial process controls Bridge amplifiers Precision data acquisition systems Medical instrumentation Strain gages Transducer interfaces

AD8221ARZ — 8-SOIC Pinout

Notes

• RG pins (2, 3): Connect an external resistor between these two pins to set gain according to G = 1 + (49.4 kΩ / RG).
• REF pin (6): Drive with a low-impedance voltage source to level-shift the output.
• Pin numbering confirmed from the TOP VIEW diagram in the datasheet.

Table 3.

Temperature range for specified performance is –40°C to +85°C. See Typical Performance Characteristics for expected operation from 85°C to 125°C.

Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

THERMAL CHARACTERISTICS

Specification for a device in free air.

Table 4.

ESD CAUTION

Specification for a device in free air.

Table 4.