Precision operational amplifier family for ‘Always ON’ sensing applications

31-10-2016 | Texas Instruments | Power

Texas Instruments’ LPV811 (single) and LPV812 (dual) are a ultra-low-power precision operational amplifier family for “Always ON” sensing applications in battery powered wireless and low power wired equipment. With 8kHz of bandwidth from 425nA of quiescent current and a trimmed offset voltage to under 300µV, the amplifiers provide the required precision while minimising power consumption in equipment such as gas detectors and portable electronic devices where operational battery-life is critical. In addition to being ultra-low-power, the amplifiers have CMOS input stages with fempto-amp bias currents which reduces errors commonly introduced in transimpedance amplifier (TIA) configurations with megaohm feedback resistors and high source impedance source applications. The amplifiers also feature a negative-rail sensing input stage and a rail-to-rail output stage that swings within millivolts of the rails, maintaining the widest dynamic range possible. Likewise, EMI protection is designed into the devices in order to reduce system sensitivity to unwanted RF signals from mobile phones, WiFi, radio transmitters, and tag readers. The amplifiers operate with a single supply voltage as low as 1.6V, ensuring continuous performance in low battery situations over the extended temperature range of –40C to 125C. The single and dual channel versions are available in industry standard 5-pin SOT-23 and 8-pin VSSOP packages respectively.

By Craig Dyball