AD8638ARJZ-REEL7 Integrated Circuits (ICs)

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• AD8638ARJZ-REEL7 Application Field and Working Principle

Introduction

The AD8638ARJZ-REEL7 is a low-noise, low-power and high-speed single-supply CMOS amplifier. It is suited for a range of general-purpose applications requiring very wideband and low distortion amplification. Typical applications include instrumentation, audio, and video systems. The device features very low-noise, fast settling, and wide bandwidth performance and utilizesan input common-mode voltage range of 0 V to VCC−3V.

Features and Benefits

The AD8638ARJZ-REEL7 is a low-noise, low-power and high-speed single-supply CMOS amplifier. It features high-performance basic characteristics, such as wide bandwidth (DC – 5 MHz), low noise (2.5 nV/√Hz at 5 MHz), high slew rate (100 V/µs) and low distortion (0.1%). In addition, the amplifier has very low DC offset and drift (<200 µV and <100 nV/°C, respectively). The very compact SOT-23-5 package gives the device an excellent thermal performance and minimized board space requirements.

Application Fields

• Video Systems: video amplifiers for video equipment, reference amplifiers for video switching, video line driving amplifiers
• Instrumentation: motor control, industrial process control, remote data acquisition, data display, sensor conditioning
• Audio Systems: programmable logic circuitry, equalizers, mixer/amplifiers

Working Principle

The AD8638ARJZ-REEL7 utilizes an instrumentation amplifier (IA) structure with two input stage transistors and one load transistor to produce a low frequency gain of 20 dB. The amplifier can operate on a single power supply or dual power supplies if higher power supply rejection ratio (PSRR) is desired. The input bias current is typically 10 pA and the CMRR is typically 90 dB.

The amplifier has a low input equivalent noise voltage of 2.5 nV/√Hz at a bandwidth of 5 MHz and a small signal gain of 5 V/V (20 dB). The wide bandwidth coupled with fast settling time allows for a wide variety of high-precision analog signal processing applications. The low input bias current, wide common-mode range and high linearity make it an ideal amplifier for precision instrumentation and data acquisition systems.

Conclusion

The AD8638ARJZ-REEL7 is an ideal amplifier for wideband applications requiring high precision, low noise and low power operation as it features a low input equivalent noise level (2.5nV/√Hz at 5MHz), wide bandwidth (DC to 5MHz) and low distortion (0.1%). The device is suitable for a range of general-purpose applications such as instrumentation, audio and video systems.

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