Diodes reveals its first precision op

Diodes has entered the precision low-voltage low-power op-amp fray with a dual-channel 8μV(typ) input offset voltage device consuming 12μA quiescent per amplifier.

AS2333, as it will be known, uses chopper stabilisation which reduces drift over time and temperature.

Update: Diodes automotive-qualified this part in 2022

Operation is across 1.8V to 5.5V and -40°C to +125°C, and it has rail-to-rail inputs (100mV beyond rails) and outputs (50mV inside rails).

Chopper stabilisation "also provides reduced 1/f noise and input crossover-distortion – present in most rail-to-rail input op-amps", according to the company. "Single or dual supplies as low as 1.8V and up to 5V [±0.9V to ±2.5V] can cover a wide number of battery topologies. Precision and micropower make the AS2333 suitable for high amplification of very low-level signals from sensors in a variety of battery powered applications."

Noise is 1.1μVp-p (0.01Hz – 10Hz), 350kHz bandwidth is available, as is 0.12V/μs(typ) slewing.

Packaging is SO-8, MSOP-8 or U-DFN3030-8 (Type E).

Regarding the bridge amplifier circuit above, the company said: Sensors to measure strain, pressure, and temperature are often configured in a Wheatstone bridge circuit. In the measurement, the voltage change that is produced is relatively small and needs to be amplified before going into an ADC. Precision amplifiers are recommended in these types of applications due to their high gain, low noise, and low offset voltage.

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