AD8221BR

Part: AD8221 — Analog Devices

Type: Precision Instrumentation Amplifier

Description: A gain-programmable, high-performance instrumentation amplifier with a wide power supply range of ±2.3 V to ±18 V, maintaining 80 dB minimum CMRR to 10 kHz (G=1), and featuring low noise (8 nV/√Hz input voltage noise) and high accuracy (25 μV max input offset voltage for BR grade).

Operating Conditions:

• Supply voltage: ±2.3 V to ±18 V
• Operating temperature: -40°C to +125°C
• Specified performance temperature: -40°C to +85°C
• 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, BR Grade): 90 dB min (VCM = -10V to +10V)
• CMRR at 10 kHz (G=1): 80 dB min (VCM = -10V to +10V)
• Input Voltage Noise, 1 kHz: 8 nV/√Hz max (V IN+, V IN-, V REF = 0)
• Input Offset Voltage (BR Grade): 25 μV max (VS = ±5V to ±15V)
• Input Offset Voltage Average TC (BR Grade): 0.3 μV/°C max
• Input Bias Current (BR Grade): 0.4 nA max
• Small Signal -3 dB Bandwidth (G=1): 825 kHz typ
• Slew Rate (G=1): 2 V/μs typ
• Quiescent Current: 0.9 mA typ

Features:

• Gain set with 1 external resistor (gain range 1 to 1000)
• Wide power supply range: ±2.3 V to ±18 V
• Excellent AC specifications
• Low noise
• High accuracy DC performance (AD8221BR)
• Operates on both single and dual supplies

Applications:

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

Package:

• 8-lead SOIC
• 8-lead MSOP

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 1

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

Figure 3. Pin Configuration

Table 5. Pin Function Descriptions

Table 3.

1 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.