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Zero-drift op amps target precision sensing in wearables

06 Jun 2014

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Zero-drift op amps

STMicroelectronics introduced its TSZ121 family of zero-drift op amps, which comes in popular packages and small-outline alternatives, offering 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-stabilised op amps are ideal 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.

High accuracy and stability, combined with an excellent speed/power consumption ratio, make ST's zero-drift op amps ideal 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, so 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. By also offering the TSZ124 quad op amp in TSSOP-14 and 3mm x 3mm QFN16, this family provides the industry's broadest choice of zero-drift op amps.

The TSZ121 family is in mass production now, priced from $0.95 for the TSZ121 in SC70-5 or SOT-25L package for orders of 1,000 pieces. Corresponding prices for dual TSZ122 and quad TSZ124 versions start from $1.24 and $1.62, respectively. Pricing for other package options is available on request.




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