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INA111AU

TIINA111AU

Texas Instruments
Instrumentation Amplifier 1 Circuit 16-SOIC
Active935 in stock

Overview

The INA111AU is a high-speed FET-input instrumentation amplifier that combines a 2 MHz bandwidth with an impressive 17 V/us slew rate. It features extremely low input bias current of 2 pA, making it ideal for high-impedance signal conditioning and fast data acquisition systems.

Why Choose This Part

The INA111AU offers a superior combination of speed and precision, featuring a low 200 uV offset voltage and a wide 450 kHz bandwidth at higher gain settings. Its current-feedback architecture ensures that high gains can be achieved without the severe bandwidth limitations of traditional instrumentation amplifiers.

Applications

Photodiode Preamplifiers
Utilizes the 2 pA FET-input bias current to amplify signals from high-impedance optical sensors with minimal error.
Fast Data Acquisition
The 17 V/us slew rate and high bandwidth support accurate signal capture in multi-channel multiplexed systems.
Medical Instrumentation
Provides the high input impedance and low noise (10 nV/rtHz) required for sensitive biopotential measurements.

Key Specifications

Slew Rate 17V/us
Mounting Type Surface Mount
-3db Bandwidth 2 MHz
Amplifier Type Instrumentation
Package / Case 16-SOIC (0.295", 7.50mm Width)
Current - Supply 3.3mA
Number of Circuits 1
Current - Input Bias 2 pA
Operating Temperature -40degC ~ 85degC
Voltage - Input Offset 200 uV
Supplier Device Package 16-SOIC
Current - Output / Channel 30 mA
Voltage - Supply Span (Max) 36 V
Voltage - Supply Span (Min) 12 V

Getting Started

Designing with the INA111AU requires a single external resistor to set the gain from 1 to 1000. Ensure high-quality decoupling capacitors are placed close to the 16-SOIC power pins to maintain stability during high-speed transients, and use a guard ring layout to preserve the low 2 pA input bias current performance.

INA111 Family

Comparing specs that differ across variants. The current part is highlighted.

Part Number Package Voltage - Input Offset Stock
INA111AU (this part) SOIC-16 200 uV 935
INA111AP DIP-8 200 uV 219
INA111BP DIP-8 100 uV 36

Also Consider

INA128UA TITexas Instruments - Consider this if you require lower supply current and high precision but can trade off the FET-input's high-speed slew rate.
AD8221ARZ Analog Devices - Offers industry-leading CMRR over frequency, though with higher input bias current compared to the FET-input INA111.

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