AD8221ARZ-R7

The AD8221 is a gain-programmable, high-performance instrumentation amplifier with the highest CMRR versus frequency. At G = 1, the minimum CMRR is 80 dB across all grades, extending to 10 kHz. The high CMRR versus frequency enables the AD8221 to reject broadband interference and line harmonics, greatly simplifying filter requirements. Low offset voltage, low offset drift, low gain drift, high gain accuracy, and high CMRR make this device an excellent choice for applications demanding optimal DC performance, such as bridge signal conditioning. Programmable gain provides design flexibility. Gain can be set from 1 to 1000 via a single resistor. The AD8221 operates from single or dual supplies and is particularly well-suited for applications with input voltages of ±10 V. The device is available in low-cost 8-lead SOIC and MSOP packages, both delivering best-in-class performance. The MSOP requires only half the board space of the SOIC, making it ideal for multichannel or space-constrained applications. All grades are rated over the −40°C to +85°C industrial temperature range. In addition, the AD8221 is also functional over the −40°C to +125°C range.

Applications

• Electronic scales
• Industrial process control
• Bridge amplifiers
• Precision data acquisition systems
• Medical instruments
• Strain gauges
• Sensor interfaces

Key features

• Easy to use
• Space-saving MSOP package
• Gain set with 1 external resistor (gain range: 1 to 1000)
• Wide supply voltage range: +2.3V to +18V
• Rated temperature range: -40°C to +85°C
• Operating temperature up to 125°C
• Excellent AC characteristics: CMRR: 80dB (min, 10kHz, G = 1); -3dB bandwidth: 825kHz (G = 1); slew rate: 2V/μs
• Low noise: input voltage noise: 8nV/√Hz (max, 1kHz); 0.25μV p-p input noise (0.1Hz to 10Hz)
• High accuracy DC performance (AD8221BR): CMRR: 90dB (min, G = 1); input offset voltage: 25μV (max); input offset drift: 0.3μV/°C (max); input bias current: 0.4nA (max)