Voltage - Input Offset:	20µV
Base Part Number:	ADA4807
Supplier Device Package:	10-LFCSP-WD (3x3)
Package / Case:	10-WFDFN Exposed Pad, CSP
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Voltage - Supply, Single/Dual (±):	2.7 V ~ 11 V
Current - Output / Channel:	106mA
Current - Supply:	950µA
Series:	--
Current - Input Bias:	1.2µA
-3db Bandwidth:	170MHz
Slew Rate:	145 V/µs
Output Type:	Rail-to-Rail
Number of Circuits:	2
Amplifier Type:	Voltage Feedback
Part Status:	Active
Packaging:	Tape & Reel (TR)

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ADA4807-2ACPZ-R7 Application Field and Working Principle

Introduction

The ADA4807-2ACPZ-R7 from Analog Devices is an instrumentation amplifier and can be used in various applications requiring high accuracy and precise control. It has a highCommon-Mode Rejection Ratio (CMRR) up to 110dB, low input offset voltage of 1.2mV and low input bias current of 0.5uA. It is suitable for medical and instrumentation applications, as well as communications and control systems, making it a versatile and reliablecomponent for high-precision applications.

Input Stage Design

The main feature of the ADA4807-2ACPZ-R7 is its input stage design, which consists of two precision JFETs, one P-channel and one N-channel. The inputs of these two JFETs are connected to the input terminals of the device and the output of each FET is connected to one of the two output terminals of the device. The design of the two FETs ensures a low input offset voltage and low bias current, and can accommodate a differential input voltage range up to ±5V.

Op-Amp Design

The output stage of the ADA4807-2ACPZ-R7 consists of two low noise operational amplifiers (Op-Amps). The first Op-Amp is a single-pole low-pass filter, which provides a signal bandwidth of 2kHz and a high CMRR of up to 110 dB. The second Op-Amp is a unity-gain follower and provides a signal bandwidth of 50kHz and a low noise output. The Op-Amp design also ensures good signal-to-noise ratio and low total harmonic distortion.

Buffer Amplifier Design

The buffer amplifier is used to provide a high impedance to the input terminals of the device and to maintain a constant common mode voltage. The buffer amplifier is designed using a P-channel MOSFET and an N-channel MOSFET, and is designed such that its output voltage is same as its input voltage. This buffer amplifier helps to ensure a low noise performance and also helps to maintain a constant common mode voltage at the inputs of the device.

Output Stage Design

The output stage of the ADA4807-2ACPZ-R7 consists of a low-noise P-channel JFET, which is used to provide a low-noise, high-current output signal. This FET is connected to a low-noise N-channel FET, providing a high-gain output signal which is suitable for driving power MOSFETs and bipolar junction transistors. This FET combination helps to provide a high-speed, high-current output signal with low noise and low distortion.

Application Field and Working Principle

The ADA4807-2ACPZ-R7 is suitable for high-precision analog applications, such as medical and instrumentation applications, communications systems, and high-precision current or voltage control. Its features, such as high CMRR, low input offset voltage, low input bias current and low noise output make it an excellent choice for these applications.The working principle of the ADA4807-2ACPZ-R7 is simple and straightforward. It takes a differential input voltage at its two input terminals and amplifies it by a certain gain, depending on the Op-Amp used in the output stage. The output of this amplifier is then fed to the buffer amplifier and then connected to the output stage, where it is amplified once again and then sent to its output.

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