Zero drift amp achieves ‘industry’s lowest’ voltage noise
1 min read
Analog Devices has launched what it claims to be the industry's lowest noise, zero drift operational amplifier. The ADA4528 zero drift op amp has been designed for instrumentation and medical applications and achieves an integrated voltage noise of 99nVp-p over 0.1Hz - 10Hz.
According to the semiconductor specialist, it delivers a 26% lower voltage noise at 40% less power consumption than the closest competing amplifiers. ADI says this improves system snr and lowers the noise floor, enabling 24bit resolution over 150kHz in A/D converters while improving system accuracy.
The 5.3-nV/rtHz voltage noise density allows designers to use the zero drift amplifier in broadband applications, such as piezoelectric transducers and precision data acquisition systems.
"This new precision amplifier is a flagship product in ADI's operational amplifier portfolio," said Peter Real, vice president, Linear and Radio Frequency Products and Technology Group, Analog Devices. "ADI's unique, patented chopping technique allows the ADA4528 to achieve the high levels of accuracy required for low frequency sensor measurements in systems such as data acquisition, weigh scale and precision medical instrumentation applications."
The device's zero-drift amplifier offers low offset voltage of 2.5 µV max and guaranteed offset voltage drift of 0.015 µV/°C max – the industry's lowest, according to ADI. It has a 140dB gain and a common mode rejection ratio of 135dB and a 130dB power supply rejection ratio, so is suitable for amplification of low level signals in applications such as position and pressure sensors, strain gages, and medical instrumentation. Fully specified to operate from a 2.2 to 5.5V single voltage supply over the extended industrial temperature range (-40 to 125°C) the devices is available in an 8lead Mini Small Outline Package.
