The INA500 is a cost-effective, integrated difference amplifier designed to provide better performance, and smaller solution size for applications employing discrete implementation of difference amplifiers using commodity amplifiers and discrete resistors. The device incorporates one low power operational amplifier and four precision matched integrated resistors. INA500 can be used in 8-bit system without any calibration. Further calibration of offset and gain error at a system level can improve system resolution and accuracy, enabling use in 10-bit and 12-bit systems.

The INA500 is offered in three gain options across three variants. The INA500A version offers gain option of 1, while the INA500B and INA500C versions offer gain options of 0.50 and 0.25 respectively. Optimized for voltage sensing applications, the INA500 offers 75dB of minimum common-mode rejection ratio (CMRR) and ±0.05% of maximum gain error. A high input impedance of >1MΩ along with just 13.5μA of quiescent current is one of the key features of the INA500, which is very useful in single cell battery monitoring applications. All of the errors including offset, offset drift, CMRR and so forth are referred to the output so as to enable easy calculation of signal-to-noise ratio (SNR) and effective number of bits (ENOB) close to the analog-to-digital converter (ADC).

The INA500 gain options are designed for level translation applications that interface with a wide variety of differential (±12V, ±10V, ±5V, and so forth) and single-ended (0V to 12V, 0V to 10V, 0V to 5V, and so forth) high voltage signals into low voltage (0V to 5V, 0V to 3V, 0V to 2.5V, and so forth) ADCs. This would be useful in a variety of end equipments such as Battery testers, Solar string inverters, Power tools, Analog input modules, Battery energy storage systems and so forth where multiple high voltage signals and supply domains are required to be monitored. When routing signals differentially for common-mode noise immunity, the INA500 in G = 1 would be useful in converting the differential signal back to single-ended signal for easy interface to single-ended ADCs while rejecting the common-mode noise. The device also has enough bandwidth of 125kHz to directly drive low-speed (≤10ksps) ADCs.

The INA500 is an excellent choice for use in space-constrained applications such as wearable fitness and activity monitors, cell phones, and so forth as it is offered in ultra-small, 0.8mm² X2SON package. For easy use in industrial applications, it is also available in industry standard packages including SOT-23 and SC70.