Diodes Inc. has released its first precision operational amplifier (op amp) with ultra-low input offset voltage and low noise. The AS2333 uses chopper stabilization to achieve an ultra-low input offset voltage of 8 µV (typical) and near-zero drift (0.02 µV/degree C, typical) over time and temperature. Chopper stabilization also addresses the low frequency 1/f noise and offset voltage crossover distortion typically found in rail-to-rail op amps.
Key features include a typical common-mode rejection ratio of 120 dB and a typical open loop gain of 130 dB, which is useful for small signal sensors that measure parameters such as pressure, sound, light, temperature, voltage, and current, said Diodes. Typical applications include transducers, medical equipment, chemical detectors, and handheld test instruments.
The high precision, dual-channel amplifier also features high impedance inputs with a common-mode range 100 mV beyond the rails and an output swing that is within 50 mV of the rails. For battery-operated applications, the op amp offers a typical quiescent current of 12 μA and supplies as low as 1.8 V (±0.9 V).
The device supports single or dual supplies as low as 1.8 V (±0.9V) and up to 5V (±2.5V), which covers a a variety of battery topologies, including NiMH cells as well as Li-rechargeable cells.
The AS2333 is available in SO-8 and MSOP-8 packages and is priced at $0.38 in quantities of 2500. The operating temperature range is – 40°C to +125°C.
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