TIINA148UA
Overview
The INA148UA is a high common-mode voltage difference amplifier designed to extract small differential signals in the presence of large common-mode voltages up to plus or minus 200V. It features a fixed unity gain and maintains a high CMRR of 86dB, making it ideal for high-side current sensing and industrial signal conditioning. Operating on a wide supply range from 2.7V to 36V, it consumes only 260uA of quiescent current.
Why Choose This Part
The primary advantage is the massive plus or minus 200V common-mode range, which allows the IC to operate safely on high-voltage rails that would destroy conventional amplifiers. It integrates precision-matched internal resistors to achieve 86dB CMRR and a fixed gain of 1V/V without requiring external trimming. The low 260uA supply current makes it suitable for power-constrained remote sensing applications.
Applications
Key Specifications
Getting Started
When designing with the INA148UA, ensure that the power supply pins are decoupled with 0.1uF ceramic capacitors placed close to the 8-SOIC package. The REF pin must be connected to a low-impedance voltage source to set the output level, typically ground for bipolar supplies or mid-rail for unipolar operation. Evaluation can be performed by prototyping on a standard SOIC-8 breakout board or using a custom PCB with short traces to the shunt resistor.
