Texas Instruments INA333AIDGKR Low Voltage Zero-Drift Precision Instrumentation

The Texas Instruments INA333AIDGKR is a low-power, high-precision instrumentation amplifier designed for exceptional accuracy in demanding applications. Its versatile three-operational-amplifier design, combined with a compact form factor and minimal power consumption, makes it the ideal choice for a broad spectrum of portable and battery-powered systems.

A key feature is its user-configurable gain, set by a single external resistor to achieve any value from 1 to 1000 using the industry-standard equation: G = 1 + (100kΩ/R_G). This flexibility allows for precise signal conditioning across various input levels.

Engineered for precision, the INA333AIDGKR delivers outstanding performance metrics, including a very low input offset voltage of 25µV (at G ≥100), an excellent offset voltage drift of just 0.1µV/°C (at G ≥100), and a high common-mode rejection ratio (CMRR) of 100dB (at G ≥10). It operates from a low supply voltage range of 1.8V to 5.5V (±0.9V) with a remarkably low quiescent current of only 50µA, maximising battery life.

Utilising advanced auto-calibration techniques, the amplifier maintains excellent precision over the extended industrial temperature range from -40°C to 125°C. It also features exceptionally low noise density of 50nV/√Hz (at G ≥100) that extends down to DC, alongside RFI (Radio Frequency Interference) filtered inputs for enhanced performance in electrically noisy environments. The green product design is free from antimony and brominated flame retardants (No Sb/Br).

Applications

• Audio signal conditioning
• Sensing and instrumentation systems
• Medical diagnostic equipment
• Portable measurement devices
• General test and measurement apparatus

With its rail-to-rail output, surface-mount VSSOP package, and combination of micropower operation, zero-drift architecture, and high precision, the INA333AIDGKR provides a reliable and high