AD8421BRMZ-RL

Instrumentation, Op Amps, Buffer Amps Overview

The AD8421BRMZ-RL is a low power, extremely low noise instrumentation amplifier from Analog Devices. It features a maximum supply current of 2.3 mA and an input voltage noise density of 3.2 nV/√Hz at 1 kHz. The device offers a small signal bandwidth of 10 MHz at unity gain and a slew rate of 35 V/µs. It operates on single supplies from 5 V to 36 V or dual supplies from ±2.5 V to ±18 V. Gain is programmable from 1 to 10,000 using a single external resistor. The BRM grade specifies a minimum CMRR of 90 dB at G=1 over temperature.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Extremely low input voltage noise density combined with ultralow bias current for high source impedance applications
• High-speed performance with 10 MHz bandwidth and 35 V/µs slew rate suitable for multiplexed systems
• Robust input protection allowing voltages up to 40 V beyond the opposite supply rail without damage
• Single-resistor gain setting capability ranging from 1 to 10,000

Instrumentation, Op Amps, Buffer Amps Applications

• Medical instrumentation
• Precision data acquisition
• Microphone preamplification
• Vibration analysis
• Multiplexed input applications

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific BRM grade specifications against the official datasheet, as they differ slightly from the standard BRZ grade. Confirm that the MSOP-8 package matches the design requirements. Ensure the reel packaging aligns with automated assembly processes. Cross-reference the ordering code suffix to confirm the exact temperature range and electrical tolerances intended for the application.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when low noise and high speed are critical in a low power environment. The AD8421 is suitable for driving ADCs in multiplexed systems due to its fast settling time. Consider the input bias current characteristics if interfacing with high-impedance sensors. Verify that the required gain range fits within the single-resistor configuration limits defined by the internal architecture.

Instrumentation, Op Amps, Buffer Amps Part Context

The AD8421 belongs to a family of instrumentation amplifiers designed for signal conditioning. The BRM variant utilizes an 8-lead MSOP package, offering a compact footprint compared to larger SOIC options. This series is engineered to provide high common-mode rejection while maintaining low quiescent current consumption across a wide operating temperature range.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

Check for AD8421ARMZ-RL for the same electrical performance in an MSOP package. The AD8421ARZ-RL provides equivalent specs in an SOIC-8 package. Verify pin compatibility and thermal characteristics when substituting between package types.