AD8682ARMZ

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The AD8682ARMZ is a low-noise, low-distortion, low-power precision instrumentation amplifier and programmable gain amplifier, which belongs to the category of linear amplifiers, instrumentation amplifiers, operational amplifiers (OP amps), and buffer amplifiers etc. The device is suitable for acquisition systems and medical and industrial instrumentation applications. It offers significant features that include rail-to-rail output, high common-mode rejection, low supply current, and low offset voltage.

Key Features of AD8682ARMZ

• Low noise: 2.5 nV/√Hz maximum
• Low distortion: –95 dB at 20 kHz
• High common-mode rejection: 98 dB at DC
• Low offset voltage:1 mV maximum
• Low supply current: 4 mA typical
• Low power: 125 mW maximum
• Rail-to-rail outputs
• Programmable gain from 0.2 to 116 dB
• Wide signal bandwidth: 1.9 MHz Gain = 1, 0.75 MHz Gain = 10
• High output drive: ±7 mA

Application Fields of AD8682ARMZ

The AD8682ARMZ provides ultra-low noise and distortion performance together with wide signal bandwidth, making it suitable for a variety of applications, such as high-precision signal conditioning and instrumentation systems, medical and industrial instruments, weigh scales and balance systems, data acquisition systems to amplify instrumentation signals, power management systems, tilt and vibration sensors, as well as audio preamplifiers, and RF signal conditioning circuit. It is also suitable for applications that require extremely low power while achieving high performance and easy gain settings, such as in battery-powered systems.

Working Principle of AD8682ARMZ

The AD8682ARMZ consists of two independent high-gain, low-noise amplifier stages, with a high common-mode rejection ratio of 98 dB. These two stages make use of an input buffer and a programmable gain amplifier (PGA). The PGA provides gain up to 125 dB. The signal then passes through a high voltage follower outside the amplifier in order to maintain a signal bandwidth of about 1.9 MHz at a gain of 1 and 0.75 MHz at a gain of 10.

The AD8682ARMZ has an adjustable output voltage swing and is capable of support self-biased or externally biased input and output configurations. The device can also be used in low-noise, single-supply applications, where the negative supply is replaced with the common-mode voltage at the inputs. Moreover, it can also be used in low-power applications, wherein the output swing is adjusted accordingly to reduce power consumption.

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