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Precision op amps feature low noise

Posted: 21 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:precision operational amplifiers? op amp? low voltage noise?

National Semiconductor Corp. has introduced two precision operational amplifiers that it claims offers the industry's lowest input voltage noise and highest accuracy for products operating at low frequencies and low supply voltage. Target applications include industrial and scientific weight scales, pressure sensors and other low ohmic sensor systems.

Built on the company's proprietary VIP50 BiCMOS process technology, the LMP7731 single and LMP7732 dual precision op amps are the latest additions to the company's LMP precision amplifier family and provide low input voltage noise of 2.9nV/square root Hz with a 1/f noise corner of only 3Hz. They also feature 0Hz to 10Hz peak-to-peak noise voltage of 78nVpp. This ensures highly accurate signal conditioning, while minimizing distortion in low-frequency (near DC) sensor applications, said National.

The LMP7731 and LMP7732 are low-noise, low offset voltage, rail-to-rail I/O, low-voltage precision amplifiers. These op amps feature bipolar input stages with input bias cancellation circuitry that lowers the input current to only 1.5nA. They provide low DC offset voltage at 40?V, support a supply voltage range of 1.8V to 5.5V and offer a wide gain bandwidth (GBW) of 22MHz while consuming 2mA of current. This high gain bandwidth along with a high open-loop gain of 130dB enables accurate signal conditioning in systems with high closed-loop gain requirements, said National.

The LMP7731/32 op amps offer performance exceeding 120dB for common mode rejection ratio, power supply rejection ratio and large signal voltage gain. With an input offset voltage drift of 1?V per degrees C, these op amps are able to operate across an extended temperature range of -40C to 125C. The LMP7731 and LMP7732 are available in 5-pin SOT23 and 8-pin SOIC packages, respectively.

Available now, the LMP7731 is priced at $1.15 and the LMP7732 is priced at $1.80, in quantities of 1,000.

- Gina Roos

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