AD8279ARZ-R7

Voltage - Input Offset:	50µV
Base Part Number:	AD8279
Supplier Device Package:	14-SOIC
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply, Single/Dual (±):	2 V ~ 36 V, ±2 V ~ 18 V
Current - Output / Channel:	15mA
Current - Supply:	300µA
Series:	--
Gain Bandwidth Product:	1MHz
Slew Rate:	1.4 V/µs
Output Type:	Rail-to-Rail
Number of Circuits:	2
Amplifier Type:	Differential
Part Status:	Active
Packaging:	Tape & Reel (TR)

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AD8279ARZ-R7 Application Field and Working Principle

AD8279ARZ-R7 is a dual, high-impedance instrumentation amplifier with a low-noise and low-drift design. It provides excellent input impedance and high common-mode rejection (CMRR) over a wide range of common-mode and normal-mode input voltages. The dual design of the AD8279ARZ-R7 offers maximum flexibility and allows the user to configure each amplifier as an inverting or non-inverting configuration for a variety of applications, including signal conditioning of low-level signals, measuring weak signals in noisy environments, filtering sensor inputs, and driving active loads directly from sensors.

Field of Use:

The AD8279ARZ-R7 has a wide range of applications in the instrumentation field due to its low noise and wide dynamic range. It has good power-supply rejection across the common-mode and normal-mode voltage range, making it an ideal choice for applications in medical, laboratory, industrial and other high-reliability systems. It is also used in data acquisition systems where isolation, accuracy, and repeatability of measurements are critical.In addition, the device’s high accuracy and small size make it suitable for the following applications:

• Audio systems
• Data Acquisition Systems
• Sensor Interface Circuits
• Signal Conditioning Circuits
• Data Transmission Systems

Working Principle:

The high input impedance and wide common-mode and normal-mode range of the AD8279ARZ-R7 is achieved through the use of an internal wiring block that divides the amplifier into two sections: an input differential amplifier stage and an output voltage buffer. The differential amplifier stage is designed to amplify the differences between two input signals. The differential amplifier is formed by two input resistors and two internal transistors. The resistors and capacitors condition the signals before they are amplified. Voltage gain of the differential amplifier is adjustable thanks to the external feedback resistors and the internal gain adjustment resistor. This feature helps optimizing the performance of the amplifier in terms of gain and bandwidth.The output voltage buffer stage is used to isolate the load from the input and improve the CMRR. This stage is composed of an operational amplifier and an enabling transistor. When the enable input is active, the buffer amplifies the output of the differential amplifier and drives the load with it. The buffer is designed to emulate a low source impedance so the load sees a voltage source rather than a current source.

Conclusion:

The AD8279ARZ-R7 from Analog Devices is a dual, high impedance instrumentation amplifier optimized for low noise, low drift, and high overall accuracy. Its unique combination of features and performance makes it suitable for a wide variety of instrumentation applications. Its high input impedance and wide common-mode and normal-mode range enable it to work effectively in extreme environments, while its flexible configuration options make it ideal for a variety of signal conditioning and data acquisition tasks.

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