OPA228U/2K5

Voltage - Input Offset:	5µV
Base Part Number:	OPA228
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 (±):	5 V ~ 36 V, ±2.5 V ~ 18 V
Current - Output / Channel:	45mA
Current - Supply:	3.7mA
Series:	--
Current - Input Bias:	2.5nA
Gain Bandwidth Product:	33MHz
Slew Rate:	11 V/µs
Output Type:	--
Number of Circuits:	1
Amplifier Type:	General Purpose
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The OPA228U/2K5 is an instrumentation amplifier with low noise, low input bias current and high common mode rejection ratio. It is designed for low voltage and low power applications, such as audio equipment and medical instruments. The OPA228U/2K5 amplifier has a wide input range, low temperature drift and low input bias current, making it suitable for both low and high signal level operations. The OPA228U/2K5 application field and working principle will be discussed in this article.

Application Field

The OPA228U/2K5 amplifier is mainly used in audio applications. The OPA228U/2K5 amplifier has low noise and wide bandwidth performance, and can be used to amplify the signal from a microphone, CD or vinyl record player, and is commonly found in preamplifiers and receivers. The OPA228U/2K5 is also used in medical instruments, such as CT scans and MRI machines, which must be extremely sensitive and accurate in order to produce reliable images. The OPA228U/2K5 amplifier is also used for measuring vibration and temperature, allowing for precise monitoring and control over a wide range of applications.

Working Principle

The OPA228U/2K5 amplifies the input signal by utilizing three differential inputs. Each input is connected to the positive terminal of the amplifier, while the output of the amplifier is connected to the negative terminal. The input signal is applied to the negative terminal of the amplifier, and the amplified signal is taken from the positive terminal. The OPA228U/2K5 amplifies the input signal by comparing it to a reference voltage, which is applied to the amplifier’s negative terminal. The reference voltage is referred to as the common-mode voltage, and the amplifier’s output is the difference between the common-mode voltage and the input signal. The OPA228U/2K5 amplifier has a high common-mode rejection ratio, meaning that any signal present in the common-mode voltage will be ignored. The output of the amplifier is proportional to the input signal, and the gain can be adjusted by changing the reference voltage. The OPA228U/2K5 also has a low input bias current, which means that it will not produce a signal when no input is present, prevention distortion from occurring in the signal path. The OPA228U/2K5 also has a wide input range, which is adjustable from -5 to +5V, with the high-end being capable of up to +12V. The low temperature drift and low input bias current make the OPA228U/2K5 suitable for both low and high signal level operations.

Conclusion

OPA228U/2K5 is an instrumentation amplifier good for low power applications, such as audio equipment and medical instruments. The working principle of OPA228U/2K5 is comparing an input signal with a reference voltage, in order to amplify it. The OPA228U/2K5 has a low noise, wide bandwidth performance and a low input bias current, making it suitable for both low and high signal level operations.

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