Zero-drift op amps are small for wearables

11 June 2014

STMicroelectronics’ TSZ121 family of zero-drift op amps are in small-outline packages for use in wearable devices.

With input-offset voltage of 5µV at 25°C, and temperature stability of 30nV/°C, the chopper-stabilized op amps can be used for front-end signal conditioning or low-side current measurement in temperature sensors, wellness and fitness monitors, and automotive controls.
The level of precision guarantees accuracy without trimming, says the company, thereby saving component count and manufacturing overhead. Ultra-low temperature drift prevents system-performance degradation at higher temperature without requiring self-calibration.
 
The single-channel TSZ121 is pin- and package-compatible with comparable devices from other manufacturers. The dual-channel TSZ122 is in MiniSO-8 and SO-8 packages with the option of a miniature 2 x 2mm DFN8. The TSZ124 quad op amp is in TSSOP-14 and 3 x 3mm QFN16.



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