Eliminate 1/t corner frequency and realize offset drift

TI has released a zero-drift 36V instrumentation amplifier. The new INA188 enables high accuracy and precise DC and low-frequency band measurements in a wide range of applications, such as test and measurement, medical, and industrial process control equipment.


The most distinctive feature is that it eliminates the 1/t corner frequency and realizes offset drift, enabling precise measurements across a wide industrial temperature range. The architecture applied to the INA188 not only enables precise measurements but also achieves a low offset voltage of 2525µV and an offset voltage drift of 80 nV/ºC, which is 33% lower compared to competing solutions, providing long-term temperature stability for finished product use.


It generates noise of only 250 nV _PP from 0.1 Hz to 10 Hz, and there is no 1/f corner frequency between the broadband and near DC. Along with the INA188's broadband noise floor of 12.5 nV/√Hz, it provides precision for low-frequency applications. Finally, the INA188, capable of operating up to 36, generates more gain than low-voltage instrumentation amplifiers, allowing it to maintain signal integrity over the entire temperature range.



The INA188 amplifier can be quickly supported using the following support tools. The performance of the INA188 can be evaluated using the general-purpose instrumentation amplifier EVM (SO8), and board-level signal integrity requirements and device characteristics are verified using the free TINA-TI™ SPICE macromodel. Additionally, a 3-terminal PLC reference design including the INA188 uses a +/-10V or +/-20mA input with a 5V analog-to-digital converter (ADC).
Converts to a single output voltage for.

The INA188 is currently available in a 4.9mm x 3.91mm SOIC package at a price of $1.85 per 1,000-unit quantity. It is scheduled to be available in a 4mm x 4mm WSON (very thin small outline no lead) package early in the fourth quarter.