AD8421BRMZ

AD8421BRMZ is a low cost, high performance operational amplifier specifically designed for instrumentation, due to its superior noise and distortion performance. It operates with a single-supply voltage, which makes it easy to use in many applications. This article will discuss the application field and working principle of the amplifier.

Application Field

The AD8421BRMZ is ideal for instrumentation, OP Amps, buffer Amps, and many other applications where low noise and distortion performance is needed. It can be used in active filters and signal conditioning in medical and industrial instrumentation, audio, and video systems. Additionally, it performs well in automotive applications and can be used for closed-loop control and feedback, providing accurate and reliable performance.

Working Principle

The AD8421BRMZ is a low cost, high performance operational amplifier consisting of a differential input stage, a phase-compensated internal gain stage, and an output amplifier. It employs an input offset voltage feedback technique to achieve a 3nV/√Hz typ. noise floor while still maintaining a power-supply rejection ratio of 120 dB typ. and a common-mode rejection ratio of 120 dB typ. At the same time, it offers a minimum distortion of < 0.0025% THD typical at 1 kHz.

The output stage is a variable-gain power amplifier with a variable gain/saturation control, offering an output voltage swing of ±28 V (p-p) typ. and a maximum output current of 250 mA. It is protected against damage from load shorts to ground thanks to its thermal shutdown for overload protection and the user-adjustable gain/saturation control.

Conclusion

In conclusion, the AD8421BRMZ is a low cost, high performance operational amplifier ideal for instrumentation, OP Amps, buffer Amps, and many other applications where low noise and distortion performance is needed. It operates with a single-supply voltage and offers a 3nV/√Hz typ. noise floor while still maintaining a power-supply rejection ratio of 120 dB typ. and a common-mode rejection ratio of 120 dB typ. It also offers a minimum distortion of < 0.0025% THD typical at 1 kHz and its thermal protection makes it safe for load shorts to ground. The AD8421BRMZ is a great choice for applications where low noise and distortion are required.