INA146

The INA146 from Texas Instruments is a precision difference amplifier designed for accurately attenuating high differential voltages and rejecting high common-mode voltages. This makes it suitable for signal processing applications requiring compatibility with common voltage levels. Its high-voltage capability also provides inherent input protection.

The device features a wide supply range, supporting single supplies from 4.5V to 36V and dual supplies from ±2.25V to ±18V. It offers a programmable voltage gain ranging from 0.1V/V to 100V/V, which can be set with external resistors without affecting the common-mode input range. The amplifier boasts a high common-mode rejection ratio (CMRR) of 76 dB and a low input offset voltage of ±0.005V.

With an input common-mode range extending beyond both supply rails, the INA146 is well-suited for both single and dual supply configurations. On-chip precision resistors are laser-trimmed for accurate gain and high common-mode rejection, with excellent TCR tracking ensuring consistent precision over temperature. The INA146 is available in an 8-pin SOIC surface-mount package.

Key specifications include a 1-channel configuration, a quiescent current of 0.6mA typical, and a small-signal bandwidth of 500kHz typical. The operating temperature range is -40°C to 85°C. The amplifier's gain error is a maximum of 0.1%, and its gain drift is 1 ppm/°C maximum.