Voltage - Input Offset:	500µV
Base Part Number:	OPA129
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply, Single/Dual (±):	10 V ~ 36 V, ±5 V ~ 18 V
Current - Output / Channel:	10mA
Current - Supply:	1.2mA
Series:	Difet®
Current - Input Bias:	0.03pA
Gain Bandwidth Product:	1MHz
Slew Rate:	2.5 V/µs
Output Type:	--
Number of Circuits:	1
Amplifier Type:	General Purpose
Part Status:	Active
Packaging:	Tube

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OPA129UBG4 Application Field and Working Principle

Introduction

The OPA129UBG4 is a low-noise JFET-input operational amplifier that has been optimized for high-accuracy, low-noise operation in a variety of linear and audio applications. This high-performance op-amp is ideal for instrumentation, signal conditioning, and buffer amplifier uses. The OPA129UBG4 has a few vital features, such as its low noise, low offset voltage and low input bias current, that facilitate its performance in high-accuracy, noise-sensitive designs. The device is provided in an 8-pin SOIC package.

Application Field

The OPA129UBG4 belongs to the Linear-Amplifiers-Instrumentation, OP Amps, and Buffer Amps categories because it is designed to perform as an operational amplifier, buffer amplifier, and instrumentation amp.Instrumentation: The high-accuracy OPA129UBG4 is particularly suitable for applications that require low offsets, low noise, and high accuracy, such as data acquisition systems.Buffer Amplifier: As a buffer amplifier, the OPA129UBG4 can be used to increase the input impedance and improve the accuracy of readings taken from low-impedance sources, in addition to providing high input voltage and low output voltage range.Signal Conditioning: The low-noise OPA129UBG4 is suitable for use in a variety of signal conditioning applications, such as DC level shifting and impedance transformation.Other Applications: The OPA129UBG4 can be used in a wide range of other applications, such as speech and audio transmission and recording, and high-precision active filters.

Operating Principle

The OPA129UBG4 is a JFET-input operational amplifier that uses an input stage composed of an NMOS transistor and source-follower LED. It provides the necessary low noise and high input impedance performance. The op-amp provides an open-loop gain of typically 125 dB, a speed of 740 V/µs, and a Unity Gain Bandwidth of 3MHz.The OPA129UBG4 has a temperature-compensated internal offset operating with a bias current of typically 10 pA. The offset drift is less than 0.1 µV/°C at the -25°C to 85°C temperature range. The minimum total harmonic distortion is -92 dB, and the output conservatively exhibits a voltage swing of ±6 V. The device also features rail-to-rail input and output, clipping at only 6.5V from rail.The OPA129UBG4 is offered in an 8-pin SOIC package for an efficient, space-saving design. It also offers short-circuit protection, as well as an adjustable output current limit.

Conclusion

The OPA129UBG4 is an exceptional low-noise JFET-input operational amplifier that has been optimized for use in a variety of linear and audio applications. The device has excellent characteristics such as low noise levels, low offset voltage, low input bias current, and high-gain bandwidth of 3MHz, making it perfect for high-accuracy and noise-sensitive design applications. The OPA129UBG4 is classified in the Linear-Amplifiers-Instrumentation, OP Amps and Buffer Amps categories due to its functionality and intended use.

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