High-voltage and lowest noise, autozero op amp extends system uptime and improves sensor performance

SUNNYVALE, USA: Maxim Integrated Products introduced the MAX44251 a 20V, ultra-precise, low-noise dual op amp that extends maintenance system uptime and maximizes sensor performance. Proprietary autozero technology enables continuous self-calibration which, in turn, ensures system accuracy over time, temperature, and power-supply variations. The precision (< 6µV initial offset) over the wide 2.7V to 20V operating range is unmatched by the competition.

This excellent precision improves system accuracy and minimizes errors during signal conditioning. The accuracy over the extended voltage range also makes the op amp more flexible for a range of designs and applications. The MAX44251 provides excellent RF immunity filters that remove the unwanted RF signals often found in industrial and medical applications. Superior efficiency and power savings come with no sacrifice in performance.

The low 1.15mA current consumption per channel offers excellent 10MHz gain bandwidth and the industry’s lowest noise (5.9nV/√Hz input referred voltage) for a high-voltage autozero op amp. The MAX44251 is ideally suited for high-voltage applications that require ultra-low noise and ultra-high DC precision, such as interfacing with pressure sensors, strain gauges, precision weight scales, and medical instrumentation.

The MAX44251 has near-zero DC offset and drift through the use of a proprietary autocorrelating, zeroing technique. Autozeroing constantly measures and compensates the input offset, thus eliminating drift over time and temperature and the effect of 1/f noise. The low-input offset voltage of 6μV (max) and voltage temperature drift of 19nV/°C (max) offer precision across -40°C to +125°C. Autozero offset calibration also eliminates the effects of power-supply variations and even common-mode variations.

Along with the lowest noise in its class, the MAX44251 high-speed (10MHz) autozero op amp adds high-precision capabilities. The device’s power-supply rejection ratio (PSRR), common-mode rejection ratio (CMRR), and large-signal voltage gain (AVOL) exceed 135dB at +25°C. This accuracy over its wide voltage range increases the flexibility of the design and minimizes the errors during signal conditioning.

The MAX44521 is rated over the -40°C to +125°C temperature range and is available in 8-pin SOT23 and µMAX® packages. Pricing starts at $1.48 (1000-up, FOB USA).