INA126 and INA2126 are precision instrumentation amplifiers for accurate, low noise differential signal acquisition. Their two-op-amp design provides excellent performance with very low quiescent current (175µA/chan.). This, combined with wide operating voltage range of ±1.35V to ±18V, makes them ideal for portable instrumentation and data acquisition systems. Gain can be set from 5V/V to 10000V/V with a single external resistor. Laser trimmed input circuitry provides low offset voltage (250µV max), low offset voltage drift (3µV/°C max) and excellent common-mode rejection. Single version package options include 8-pin plastic DIP, SO-8 surface mount, and fine-pitch MSOP-8 surface mount.
The document describes the INA126 and INA2126 precision instrumentation amplifiers designed for accurate, low-noise differential signal acquisition. These devices feature a two-op-amp design with very low quiescent current of 175 µA per channel and operate over a wide supply voltage range from ±1.35V to ±18V.
Key specifications include a maximum input offset voltage of 250 µV, low noise of 35 nV/√Hz at 1kHz, and gain settings adjustable from 5V/V to 10000V/V using a single external resistor. The amplifiers are available in various packages including DIP, SO-8, MSOP-8 for the single version, and SSOP-16, SO-16, and DIP for the dual version.
| Quiescent Current | 175 µA/chan. |
|---|---|
| Supply Voltage Range | ±1.35V to ±18V |
| Input Offset Voltage (Max) | 250 µV |
| Offset Voltage Drift | 3 µV/°C max |
| Voltage Noise (1kHz) | 35 nV/√Hz |
| Gain Range | 5 to 10000 V/V |
| Operating Temperature Range | -40 °C to +85°C |
The gain is set by an external resistor RG using the equation G = 5 + 80kΩ/RG.
The dual version is available in SSOP-16 fine-pitch surface mount, SO-16, and 16-pin DIP.