AD8228BRZ

Instrumentation, Op Amps, Buffer Amps Overview

The AD8228BRZ is a precision instrumentation amplifier from Analog Devices featuring internal laser-trimmed resistors for high gain accuracy. It offers pin-strappable gains of 10 and 100, eliminating the need for external components. The device operates on dual or single supplies ranging from ±2.3 V to ±18 V. Key electrical specifications include a maximum input offset voltage of 50 μV, a gain drift of 2 ppm/°C, and a common-mode rejection ratio (CMRR) of 100 dB at DC. It provides a –3 dB bandwidth of 650 kHz at Gain = 10 and consumes 850 μA of quiescent current. The component is housed in an 8-lead SOIC package.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Pin-strappable gain configuration allows selection between 10 and 100 by connecting or leaving open specific gain pins.
• Internal laser-trimmed resistors ensure superior gain accuracy and low gain drift compared to typical instrumentation amplifiers.
• High common-mode rejection ratio maintains performance across frequency ranges, providing immunity to line noise and harmonics.
• Wide supply voltage range supports operation with both single and dual power sources up to ±18 V.

Instrumentation, Op Amps, Buffer Amps Applications

• Weigh scales
• Industrial process controls
• Bridge amplifiers
• Precision data acquisition systems
• Medical instrumentation

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the B grade designation ensures compliance with specified DC parameters including 50 μV max offset voltage and 2 ppm/°C gain drift. Confirm the SOIC-8 package matches the required PCB footprint. Ensure the operating environment stays within the industrial temperature range of −40°C to +85°C for guaranteed performance. Check that supply voltages do not exceed ±18 V to prevent damage.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when high DC accuracy and low drift are critical for signal conditioning applications. The fixed internal gains simplify circuit design by removing external resistor matching requirements. Consider the 650 kHz bandwidth if higher frequency response is needed at Gain = 10. Evaluate the 850 μA quiescent current against power constraints. Use the REF pin for output level shifting if interfacing with single-supply ADCs.

Instrumentation, Op Amps, Buffer Amps Part Context

The AD8228 belongs to the AD822x family of instrumentation amplifiers designed for precision applications. Unlike adjustable gain models such as the AD8221, this part provides fixed gains via pin strapping. It shares architectural similarities with other three-op-amp topologies but distinguishes itself through integrated laser trimming for enhanced CMRR and gain stability over temperature variations.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

The AD8221 is noted as a pin-compatible alternative offering a wider gain range of 1 to 1000. Verify pin compatibility and package dimensions before substitution. Review specific DC and AC parameter differences to ensure the replacement meets system accuracy and bandwidth requirements.

Instrumentation, Op Amps, Buffer Amps FAQ

How is the gain configured on the AD8228?

The gain is set using Pins 2 (G1) and Pin 3 (G2). Leave these pins unconnected for a gain of 10, or short them together to achieve a gain of 100.

What is the function of the REF pin?

The REF pin sets the output voltage reference level. It allows the output signal to be offset relative to ground, which is useful for level-shifting signals to match single-supply ADC input ranges.

Can the AD8228 operate with a single supply?

Yes, the AD8228 operates on both single and dual supplies. The total supply voltage range is from 4.6 V to 36 V (±2.3 V to ±18 V).