AD8643ARZ-REEL

Voltage - Input Offset:	70µV
Base Part Number:	AD8643
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Voltage - Supply, Single/Dual (±):	5 V ~ 26 V, ±2.5 V ~ 13 V
Current - Output / Channel:	12mA
Current - Supply:	200µA
Series:	--
Current - Input Bias:	0.25pA
Gain Bandwidth Product:	3.5MHz
Slew Rate:	3 V/µs
Output Type:	Rail-to-Rail
Number of Circuits:	4
Amplifier Type:	J-FET
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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AD8643ARZ-REEL application field and working principle

AD8643ARZ-REEL is a quad-channel low noise operational amplifier, belonging to the category of instrumentation, operational amplifiers, buffer systems. It integrates four low noise amplifiers into a single package, and is designed for a wide range of applications such as optical fiber communications, portable electronic equipment, and test and instrumentation.

Overview

An operational amplifier is used as an amplifier, low-pass filter, high-pass filter, amplifier equalizer, and level shifter. They are ideal for differentiating, summing voltages, and providing gain. The AD8643ARZ-REEL is a particularly low-noise amplifier capable of bridging the often small voltage differences in sensing equipment. It is optimized for both dc and low-frequency (1Hz to 10kHz) signal amplification.

Features

The AD8643ARZ-REEL has several features that make it well-suited for instrumentation applications. These include:

• Low-noise – The amplifier has an input noise of 11 nV/√Hz maximum, with a gain of 1000. This ensures that any small signals can be accurately amplified without introducing too much noise.
• Offset voltage compensation – The amplifier is designed with an input offset voltage of ±10 μV. This helps to ensure that the amplifier does not introduce extra noise or drift over time.
• Wide range of gain – The device is capable of providing gains between -10 and +10, in an adjustable fashion.

Applications

The AD8643ARZ-REEL is primarily used as an amplifier in test and instrumentation applications, such as in medical instrumentation, biomedical research, gas chromatographic and mass spectrometric systems, and optical fiber communications. It is also used in portable electronic equipment, where its low noise, high gain, and wide range of gain help to ensure the accuracy and precision of the measurement.

Working Principle

The AD8643ARZ-REEL operates on the same principle as all operational amplifiers. It consists of two input terminals and one output terminal, usually involving a source or sensor, an operational amplifier and an output circuit. The operational amplifier is a differential amplifier, meaning that it takes two input signals and amplifies the difference between them instead of amplifying either one of them. The input signal is applied to the two input terminals respectively and the output of the amplifier is obtained at the output terminal. The input signals to the two input terminals determine the gain of the amplifier which is set by the difference between the two inputs. The output is then amplified by the factor of the gain and is obtained at the output terminal.The basic principles of the AD8643ARZ-REEL are common to most operational amplifiers. It has high gain, low noise, adjustable gain, and can be used to accurately amplify small signals without introducing noise or drift. The AD8643ARZ-REEL is specially designed for low noise applications, and is a good choice for instrumentation and test equipment.

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