INA101CM

Overview

The INA101CM is a high-accuracy instrumentation amplifier manufactured by Texas Instruments. It features a gain set by a single external resistor, offering a range from 1 V/V to 1000 V/V with a gain error of 0.002%. Key electrical parameters include a maximum input offset voltage of 50 µV, a minimum common-mode rejection ratio (CMRR) of 106 dB, and a bandwidth of 300 kHz. The device operates on dual supplies ranging from ±5 V to ±20 V, consuming 6.7 mA of supply current. It is housed in a 14-pin CDIP package.

Feature Summary

• Provides very high accuracy instrumentation amplification suitable for precision data acquisition systems.
• Features a unity-gain buffer configuration option via a single external resistor for simplified circuit design.
• Delivers exceptional common-mode rejection capabilities to isolate small differential signals from large common-mode voltages.

Applications

• Precision data acquisition systems requiring high CMRR
• Medical instrumentation such as ECG and EEG front-ends
• Industrial process control sensor interfaces

Procurement Notes

Verify the specific suffix and manufacturer origin, as the INA101 was originally a Burr-Brown product acquired by Texas Instruments. Confirm availability status as legacy components may have limited production runs or obsolescence notices. Ensure the package type matches the required footprint, typically CDIP for this part number. Cross-reference datasheet revisions to confirm pinout compatibility with existing designs.

Selection Notes

Select the INA101CM when high DC accuracy and low drift are critical for signal conditioning applications. The fixed internal architecture minimizes component count compared to discrete op-amp solutions. Consider the thermal performance within the CDIP package if operating at elevated temperatures. Verify that the required gain setting resistor tolerance aligns with the system's overall accuracy requirements.

Part Context

The INA101 series belongs to the family of high-performance instrumentation amplifiers designed for precision measurement tasks. Originally developed by Burr-Brown, these devices are now supported under the Texas Instruments portfolio. The CM variant denotes a commercial temperature range and ceramic DIP packaging, distinguishing it from military or plastic package alternatives within the same functional family.

Replacement Considerations

Direct replacements include the INA101AG or INA101CP depending on package and temperature grade requirements. For modern equivalents, consider the INA333 or INA826 families, though pinouts and gain configurations may differ. Verify that substitute parts meet the original 106 dB CMRR and 50 µV offset voltage specifications.