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Dual Op Amp extends maintenance system uptime.

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November 15, 2011 - With autozero technology, 20 V Model MAX44251 offers continuous self-calibration, ensuring system accuracy over time, temperature, and power supply variations. Less than 6 µV initial offset over 2.7-20 V operating range minimizes errors during signal conditioning. Unit's 1.15 mA current consumption per channel offers 10 MHz gain bandwidth and 5.9 nV/rt-Hz input referred voltage noise. Operating from -40 to +125°C, op amp is suited for pressure sensors, strain gauges, and medical instrumentation.

High-Voltage and Lowest Noise, Autozero Op Amp

(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)

Maxim Integrated Products
120 San Gabriel Dr.
Sunnyvale, CA, 94086

Press release date: November 14, 2011

Extends System Uptime and Improves Sensor Performance

SUNNYVALE, Calif., -- Maxim Integrated Products (Nasdaq:MXIM) introduces 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 (< 6uV 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/rt-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 6uV (max) and voltage temperature drift of 19nV/degree Celsius (max) offer precision across -40 degrees C to +125 degrees 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 degrees 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 degrees C to +125 degrees C temperature range and is available in 8-pin SOT23 and uMAX(R) packages.

Pricing starts at $1.48 (1000-up, FOB USA). For more information on Maxim's industrial signal-chain solutions please visit:

About Maxim Integrated Products
Maxim makes highly integrated analog and mixed-signal semiconductors. Maxim reported revenue of approximately $2.5 billion for fiscal 2011. For more information, go to

uMAX is a registered trademark of Maxim Integrated Products, Inc.

Drew Ehrlich
Public Relations
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