INA819IDRGT

Instrumentation, Op Amps, Buffer Amps Overview

The INA819IDRGT is a precision instrumentation amplifier from Texas Instruments, featuring low offset voltage of 35 µV maximum and 8 nV/√Hz noise. It operates on single supplies from 4.5 V to 36 V or dual supplies from ±2.25 V to ±18 V. The device offers a gain range of 1 to 10,000 set by one external resistor, with bandwidths of 2 MHz at G=1 and 270 kHz at G=100. Input protection extends to ±60 V, and it maintains high common-mode rejection of 110 dB minimum at G=10. Quiescent current is 385 µA maximum, and it functions within –40°C to +125°C.

Instrumentation, Op Amps, Buffer Amps Feature Summary

• Super-beta input transistors provide exceptionally low input offset voltage, drift, bias current, and noise for high-precision signal conditioning.
• Integrated overvoltage protection safeguards inputs against damage up to ±60 V during fault conditions.
• Optimized circuitry ensures high common-mode rejection ratio exceeding 90 dB across the full input common-mode range at unity gain.
• Stable operation is maintained with capacitive loads up to 1 nF without requiring additional compensation components.

Instrumentation, Op Amps, Buffer Amps Applications

• Analog input modules
• Flow transmitters
• Battery test equipment
• Electrocardiogram (ECG) systems
• Process analytics sensors

Instrumentation, Op Amps, Buffer Amps Procurement Notes

Verify the specific package variant corresponding to the 'DRG' suffix, which denotes an 8-pin WSON package. Confirm that the ordering code matches the required thermal pad configuration and tape-and-reel quantity specifications provided in the manufacturer's orderable part list. Ensure compatibility with the intended operating temperature range and supply voltage constraints before finalizing procurement.

Instrumentation, Op Amps, Buffer Amps Selection Notes

Select this component when high precision and low power consumption are critical requirements. The wide supply voltage range supports both single-supply and dual-supply architectures. Consider the gain-setting resistor tolerance if strict gain accuracy is needed, as internal gain error is minimal but external resistor drift affects overall performance. Evaluate thermal dissipation needs based on the WSON package thermal resistance characteristics.

Instrumentation, Op Amps, Buffer Amps Part Context

This device belongs to the INA819 family of precision instrumentation amplifiers designed for industrial and medical applications. It shares architectural similarities with the INA818 and INA821 but differs in pinout and specific electrical characteristics like bandwidth and noise density. The family utilizes super-beta input stages to achieve low offset and drift, distinguishing it from standard chopper-stabilized or bipolar input amplifiers.

Instrumentation, Op Amps, Buffer Amps Replacement Considerations

INA818: Similar specifications but different pinout for gain setting. INA821: Higher bandwidth but slightly higher noise. INA828: Comparable offset and noise levels with similar pinout. Verify pin compatibility and electrical parameter margins when substituting.

Instrumentation, Op Amps, Buffer Amps FAQ

How is the gain of the INA819 configured?

Gain is set by a single external resistor connected between pins 2 and 3, following the equation G = 1 + 50 kΩ / RG.

What is the input overvoltage protection limit?

The inputs are protected against overvoltage up to ±60 V relative to the negative supply rail.

Can the INA819 drive capacitive loads directly?

Yes, the device is stable with capacitive loads up to 1 nF without requiring additional series isolation resistors.