INA105KUE4

Overview

The INA105KUE4 is a precision unity-gain differential amplifier manufactured by Texas Instruments. It integrates a high-precision operational amplifier with laser-trimmed on-chip metal film resistors to achieve accurate gain and high common-mode rejection without external components. The device operates within a supply voltage range of ±5V to ±18V, supporting single or dual supplies up to 36V total. Key electrical specifications include a minimum common-mode rejection ratio of 72dB, a maximum offset voltage of 500µV, and a bandwidth of 1MHz. It is housed in an 8-pin SOIC package and functions across an operating temperature range of -40°C to 85°C.

Feature Summary

• Monolithic integration of a precision op amp and laser-trimmed resistor network for accurate unity-gain difference amplification
• High common-mode rejection ratio ensuring effective noise suppression in differential signal applications
• Extended input common-mode voltage range that exceeds the positive and negative supply rails
• Low gain error and drift characteristics maintained through excellent thermal coefficient tracking of internal resistors

Applications

• Battery cell formation and test equipment
• Sensor tags and data logging systems
• Servo drive position feedback circuits
• Industrial level transmitters
• String inverter monitoring systems

Procurement Notes

Verify the specific fabrication flow and chip site origin (CSO) required for your application, as performance parameters may vary between sources. Ensure the ordering suffix matches the desired package and grade. Confirm compliance with current RoHS standards and check for any recent documentation updates or design changes before finalizing procurement.

Selection Notes

Select this component when a fixed unity-gain difference amplifier configuration is required without the need for discrete precision resistor matching. It is suitable for applications demanding high common-mode rejection and low offset voltage. Consider the thermal resistance and power dissipation limits if operating at high temperatures or with significant load currents.

Part Context

The INA105 belongs to the Burr-Brown heritage product line acquired by Texas Instruments, known for high-precision analog signal conditioning. The K grade denotes a specific performance tier within the family, offering robust common-mode rejection and offset specifications suitable for general-purpose precision instrumentation. The E4 suffix indicates lead-free packaging compliant with environmental directives.

Replacement Considerations

Official substitutes are not explicitly listed in the provided datasheet. Designers should evaluate other precision differential amplifiers from the manufacturer's portfolio, ensuring compatibility with supply voltage ranges, package dimensions, and electrical performance metrics such as CMRR and offset voltage.

FAQ

What is the maximum input common-mode voltage range?

The operating common-mode input voltage range extends beyond the supply rails, specified as -20V to +20V when powered by ±15V supplies.

How does the device handle source impedance mismatches?

Source impedances connected to the inputs must be nearly equal to maintain optimal common-mode rejection. A mismatch can degrade CMRR; adding a series resistor to balance the impedance can preserve performance.

Can the INA105 be configured for gains other than unity?

Yes, while it is optimized for unity-gain difference amplification, the internal op amp allows for various configurations including non-inverting, inverting, and instrumentation amplifier setups using external resistors.