New zero-drift op amps look to maximise precision sensing in wearable products

STMicroelectronics’ new TSZ121 family of zero-drift op amps has been developed to provide greater choice, accuracy, and precision for Internet-of-Things (IoT) or wearable-device applications including temperature sensors, wellness and fitness monitors, and automotive controls.

With input-offset voltage of 5µV at 25°C, and temperature stability of 30nV/°C, these chopper-stabilized op amps are intended for front-end signal conditioning or low-side current measurement. Their precision guarantees accuracy without trimming, thereby saving component count and manufacturing overhead. Ultra-low temperature drift prevents system-performance degradation at higher temperature without requiring self-calibration, resulting in a better end-user experience.

Very high accuracy and stability, combined with speed/power consumption ratio, mean that ST’s new zero-drift op amps make a suitable choice for sensor and control interfaces in a wide range of battery-powered IoT applications.

The TSZ121, TSZ122 and TSZ124 expand ST’s high-precision line-up, which also includes non-switching op amps such as the TSV711 and TSV731, offering versatile choices for a wide range of system and application requirements. The devices operate from 1.8V to 5.5V, with quiescent current below 40µA at 5V, gain-bandwidth product of 400kHz, and ultra-low input bias current.

The single-channel TSZ121 is pin- and package-compatible with comparable devices from other manufacturers. The dual-channel TSZ122 offers popular MiniSO-8 and SO-8 packages plus the option of a miniature 2mm x 2mm DFN8.


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