INA128U

Voltage - Input Offset:	10µV
Base Part Number:	INA128
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 (±):	4.5 V ~ 36 V, ±2.25 V ~ 18 V
Current - Output / Channel:	15mA
Current - Supply:	700µA
Series:	--
Current - Input Bias:	2nA
-3db Bandwidth:	1.3MHz
Slew Rate:	4 V/µs
Output Type:	--
Number of Circuits:	1
Amplifier Type:	Instrumentation
Part Status:	Active
Packaging:	Tube

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INA128U Application Field and Working Principle
Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps

The INA128U is an integrated, low power, low noise, current-feedback instrumentation amplifier designed for use in a variety of analog and digital applications. The device utilizes a minimum number of external components to achieve a wide range of gain configurations from a single gain setting of 1 to a maximum of 81. The current-feedback architecture ensures low output impedance, fast frequency response, and wide bandwidth.The amplifier is designed for low-voltage, single-supply operation and is available in the two-wire serial interface format. This format offers a high degree of flexibility and convenience for controlling the amplifier gain and other features. Additionally, the amplifier\'s rail-to-rail output swing allows it to drive load impedances as low as 600Ω while consuming low power of only 2mA.The INA128U also offers exceptional output headroom and over-current protection as well as excellent CMRR and PSRR performance over a wide range of supply voltages and temperatures. With its robust features, low cost, and small size, the INA128U is an ideal solution for many applications including medical and consumer applications, sensors, process control, audio designs, instrumentation amplifiers, industrial monitoring, and more.Working Principle

The INA128U is a single-stage instrumentation amplifier designed to accept a small, low-level differential signal as an input and amplify it in the presence of common-mode interference signals that usually accompany a differential signal. The amplifier uses an active current-feedback scheme instead of a traditional voltage-feedback scheme, which allows it to achieve high gain bandwidth product, low input offset voltage, and high common-mode rejection ratio.The input amplifier is a three-stage, differential-to-single-ended structure with two matched bipolar transistors in the input stage and two other transistors in the last stage. The input stage includes the two matched bipolar transistors connected in a differential common-base configuration, providing a high level of linearity and gain. A third bipolar transistor is connected as a common-collector configuration to act as a voltage gain stage, providing voltage amplification with low gain-bandwidth product, low distortion, and low noise.The output stage is a current-feedback combination of two transistors and an operational amplifier (OPAMP), providing the total gain desired from the amplifier. The current feedback output circuit is designed to drive even the smallest loads with minimal ringing and ringing can be adjusted by external components. This output stage also allows for an extended bandwidth and frequency and offers excellent over-current protection. The overall result is a low-noise, low-distortion amplifier with good common-mode rejection, high slew rate, adjustable output stage overload protection, and low power consumption. In addition to its excellent performance, the INA128U also features enhanced system-level protection, such as a built-in ESD protection to guard against damage from electrostatic discharge, thermal protection to avoid damage from overheating, and over-current protection. The amplifier also supports an integrated low voltage logic reference for easy integration into other ICs and systems.Conclusion

The INA128U is a versatile integrated instrumentation amplifier that offers exceptional performance in a variety of applications. The current-feedback architecture ensures low output impedance, fast frequency response, and wide bandwidth, while the three-stage input amplifier provides the high linearity and gain necessary for driving all types of loads. The amplifier\'s low voltage operation, small size, and low power consumption make it ideal for low-power applications. In addition, the integrated protection features and low voltage logic reference make it easy to integrate into other ICs and systems.

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