Power

Precision CMOS op amps deliver zero drift operation

18th December 2014
Nat Bowers
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Datasheets

Providing zero drift operation and claimed industry leading quiescent current for front-end amplifier circuits and power management designs, ON Semiconductor has announced a family of affordable, precision CMOS op amps. Enhancing the accuracy of motor control feedback and power supply control loops, the NCS325 and NCS333 op amps are suited for industrial, white goods, telecomms, wearables, IoT, test equipment and instrumentation applications.

The family is complemented by the NCV333 automotive-qualified op amp offering similar functional performance for power train, braking, electronic power steering, valve controls, fuel pump and fuel injection system applications.

Featuring high DC precision parameters, such as the 10µV maximum input offset voltage at ambient temperature and the 30nV/°C of offset temperature drift, make these amplifier devices extremely well optimised for low side current sensing and voltage differential measurement on front-end sensor functions. Minimal voltage variations over temperature along with close to zero offset ensure the efficiency of systems exposed to wide operating temperature ranges without the need for complex software calibration algorithms, resulting in a more manageable design and longer product lifespan.

The NCS325 and NCS333 provide rail-to-rail input and output performance and are optimised for low voltage operation of 1.8 to 5.5V, with a best in class quiescent currents of 21 and 17µA respectively at 3.3V. The devices operate with a gain bandwidth of 350kHz with ultra-low peak to peak noise down to 1.1µV from 0.1 to 10Hz.

Simon Keeton, Vice President, Integrated Circuit Products, ON Semiconductor, commented: “By offering precision op amps that deliver industry-leading analogue performance, these new devices meet the stringent objectives of our customer’s projects as well as addressing the ever growing industry demand for more energy efficient end designs. Historically, engineers have preferred to utilise zero drift precision op amps but the traditionally high cost of such solutions has discouraged implementation. With the introduction of this family of amplifiers, we have been able to make precision affordable.”

The NCS325 is offered in a 3x1.5mm 5-pin TSOP package for $0.35 in 3,000 unit quantities. The NCS333 is offered in a 1.5x3mm SOT23-5 package or in a 2x1.25mm SC70-5 package for $0.50 each in 3,000 unit quantities.

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