Low-power Zero Crossover Op Amp for Battery Powered Portable
Texas Instruments introduced a low power zero-crossover operational amplifier (op amp). Featuring a unique single-input-stage architecture, the OPA369 achieves rail-to-rail performance without input crossover to solve the common design problem of input offset distortion due to the change in common mode voltage that is very prominent in low-voltage, rail-to-rail applications. Combined with 1 µA quiescent current, SC70 package and operation down to 1.8V, the OPA369 simplifies high-performance designs in battery powered, portable products. The single-input stage architecture offers an offset voltage of 750 µV over the entire rail-to-rail input range and a common-mode rejection ratio (CMRR) of 100 dB minimum, thereby maximizing the useable input dynamic range for low supply voltage applications. Other features include low noise of 120 nV/rtHz, gain bandwidth of 12 kHz on 1 µA, low input bias current of 50 pA maximum, low voltage offset drift of 1.75 µV/°C (max), PSRR of 94 dB and low 1/f noise of 3.6 µVp-p (0.1 to 10Hz). Suggested resale pricing for the OPA2369 starts at $1.20 in 1,000-piece quantities.