INA338AIDGSRG4

Instrumentation, Op Amps, Buffer Amps Overview

The INA338AIDGSRG4 is a wide-temperature, precision instrumentation amplifier featuring an integrated shutdown function. It operates on a single supply voltage ranging from +2.7V to +5.5V and is housed in a 10-pin MSOP package. The device provides a maximum input offset voltage of 100 µV with a drift of 0.4 µV/°C over the specified temperature range of –40°C to +125°C. It offers a common-mode rejection ratio of 120 dB at 5V and supports gains up to 10,000 V/V via external resistors.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Integrated shutdown capability reduces quiescent current to approximately 2 µA when disabled.
• True single-supply operation with input common-mode range extending beyond the positive rail.
• High common-mode rejection ratio achieved through unique internal current-mode topology.
• Low 1/f noise and excellent long-term stability ensure high DC accuracy.

Instrumentation, Op Amps, Buffer Amps Applications

• Low-level transducer amplification for bridges and load cells
• Wide dynamic range sensor measurements
• Medical instrumentation systems
• Multi-channel data acquisition systems

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify that the specific suffix 'RG4' corresponds to the RoHS-compliant, lead-free variant as documented in the manufacturer's packaging addendum. Confirm the package designation matches the 10-pin MSOP (DGS) form factor required for the shutdown pin functionality. Ensure the ordering quantity aligns with the standard tape and reel specifications provided in the official documentation.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when a shutdown feature is required to minimize power consumption in battery-operated applications. It is suitable for designs needing true single-supply operation with inputs capable of exceeding the positive rail. Consider the external gain-setting resistor requirements for optimal noise performance and bandwidth trade-offs. Verify that the 120 dB CMRR meets the system's common-mode noise rejection needs.

Instrumentation, Op Amps, Buffer Amps Part Context

This part belongs to the INA337/INA338 family of precision instrumentation amplifiers. The INA338 specifically includes an enable/shutdown pin, distinguishing it from the INA337 which lacks this control feature. Both devices share identical electrical characteristics regarding offset, drift, and bandwidth, differing primarily in package pin count and control functionality.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

The INA337AIDGSRG4 serves as a functional substitute if the shutdown pin is not utilized in the design. Other Texas Instruments instrumentation amplifiers such as the INA114 or INA128 may be considered for different bias current or bandwidth requirements, though they lack the specific rail-to-rail input characteristics of this series.

Instrumentation, Op Amps, Buffer Amps FAQ

How does the shutdown function affect the output state?

When the Enable pin is driven low, the amplifier enters shutdown mode, reducing supply current to approximately 2 µA. The output assumes a high-impedance state during this period.

What is the recommended method for setting the gain?

Gain is set using two external resistors, R1 and R2, according to the equation G = 2(R2/R1). For best performance, R1 should be selected based on the maximum input voltage to maximize input stage gain.

Why is filtering recommended at Pin 5?

Filtering at Pin 5 minimizes noise generated by the internal auto-correction circuitry. Insufficient filtering can cause nonlinearity with large output voltage swings near the supply rails.