AD8251ARMZ-R7

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The AD8251ARMZ-R7 is a low-noise, single-channel, CMOS variable-gain amplifier (VGA) that operates from 1.8V to 5.5V supply voltage. It is designed to provide a differential input with a single-ended output in the very small outline (VSM2) package. The device is suitable for use in a variety of amplifier applications, including instrumentation, OP amps, buffers, audio, and scientific applications.

Application Field

The AD8251ARMZ-R7 is primarily used in instrumentation, OP amps, and buffer amplifiers applications. It can be used to provide gain options ranging from 0.14 × to 19.2 × differential gains with a wide input common mode range from -2.7V to +2.7V. It features a low offset voltage, low noise, wide bandwidth and high CMRR, which makes the device suitable for giving low-noise, low-distortion signals in differential filters, sample-and-hold amplifiers and linear transimpedance amplifiers.

The AD8251ARMZ-R7 is also intended for use in audio applications such as mixing, mixing amplifiers and audio/speech logarithmic amplifiers. It is suitable for low-level audio signals such as microphone preamplifiers and can provide up to 40dB of gain with a wide 3V dynamic range. Additionally, it is designed to possess excellent inter-channel phase matching, which makes it well-suited for use in demanding applications such as Audio over IP.

Finally, the AD8251ARMZ-R7 can be employed as a fast output voltage switch. It has a fast switching time that allows it to deliver high-speed voltage changes without large transients. In addition, the wide gain range and small corresponding gain steps make it well-suited for precision filtering and switching applications.

Working Principle

The AD8251ARMZ-R7 is a CMOS variable-gain amplifier that operates from 1.8V to 5.5V supply voltage. It features a wide gain range from 0.14× to 19.2× differential gain with a low offset voltage and low noise. It features a differential input and single-ended output in the very small outline (VSM2) package.

The AD8251ARMZ-R7 consists of a transconductance amplifier, a high-resolution digital-to-analog converter (DAC) and a level-shift buffer The transconductance amplifier is used to generate the output voltage from its differential inputs. The high-resolution 16-bit DAC is used to digitally control the gain of the amplifier by converting the digital code into an analog gain control voltage. The level-shift buffer is used to ensure that the output voltage is between ground and the power supply voltage.

The gain of the amplifier change slightly with temperature and supply voltage, which make the AD8251ARMZ-R7 ideal for precision applications because it offers excellent low-noise and distortion performance. The amplifier also has a shutdown control pin which can be used to put the amplifier into a low-power sleep mode when not in use.

The AD8251ARMZ-R7 provides a wide range of adjustable gain settings, precise control, and low noise and distortion performance. Its low voltage operation and wide gain range make it suitable for use in instrumentation, OP amp and buffer amplifiers audio applications, sample-and-hold amplifiers, linear transimpedance amplifiers, and high speed voltage switching.

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