AD8221BRZ

Part: AD8221ARZ — Analog Devices

Type: Precision Instrumentation Amplifier

Description: Gain-programmable instrumentation amplifier (G = 1 to 1000, set by one resistor) with ±2.3 V to ±18 V supply, 825 kHz bandwidth at G = 1, and 80 dB minimum CMRR to 10 kHz.

Operating Conditions:

• Supply voltage: ±2.3 V to ±18 V
• Operating temperature: -40 to +125 °C (specified performance -40 to +85 °C)
• Gain range: 1 to 1000 V/V, G = 1 + (49.4 kΩ/RG)

Absolute Maximum Ratings:

• Max supply voltage: ±18 V
• Internal power dissipation: 200 mW
• Output short-circuit current: indefinite
• Input voltage (common-mode and differential): ±VS
• Storage temperature: -65 to +150 °C

Key Specs:

• CMRR (DC to 60 Hz, 1 kΩ source imbalance, AR grade): 80 dB min at G = 1, 100 dB at G = 10, 120 dB at G = 100, 130 dB at G = 1000
• CMRR at 10 kHz, G = 1: 80 dB min
• Input voltage noise: 8 nV/√Hz max at 1 kHz; 0.25 μV p-p (0.1–10 Hz, G = 100 to 1000)
• Input offset voltage (AR grade): 60 μV max; drift 0.4 μV/°C max (VS = ±5 V to ±15 V)
• Input bias current (AR grade): 1.5 nA max at 25 °C; 2.0 nA max over -40 to +85 °C
• Quiescent current: 0.9 mA typ, 1 mA max at 25 °C; 1.2 mA max over -40 to +85 °C
• Bandwidth (-3 dB): 825 kHz at G = 1, 562 kHz at G = 10, 100 kHz at G = 100, 14.7 kHz at G = 1000
• Slew rate: 1.5 V/μs min, 2 V/μs typ at G = 1
• Settling time to 0.01% (10 V step): 10 μs at G = 1 to 100; 80 μs at G = 1000
• Gain error (AR grade, G = 1): 0.03% max
• Short-circuit current: 18 mA typ

Features:

• Gain set with one external resistor (1 to 1000)
• Wide supply range, ±2.3 V to ±18 V
• Excellent AC CMRR performance, maintained to 10 kHz
• Low noise and high DC accuracy
• Available in space-saving MSOP
• Operates on 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 (θJA 121 °C/W, 4-layer JEDEC board)
• 8-lead MSOP (θJA 135 °C/W, 4-layer JEDEC board)

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.