Precision op amps tout low noise

Santa Clara, Calif. — National Semiconductor Corp. has introduced two precision operational amplifiers (op amps) 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 2.9 nV/sqrt Hz with a 1/f noise corner of only 3 Hz. They also feature 0 Hz to 10 Hz peak-to-peak noise voltage of 78 nVpp. 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 input and output (RRIO), low-voltage precision amplifiers. These op amps feature bipolar input stages with input bias cancellation circuitry that lowers the input current to only 1.5 nA. They provide low DC offset voltage at 40 uV, support a supply voltage range of 1.8 V to 5.5 V and offer a wide gain bandwidth (GBW) of 22 MHz while consuming 2 mA of current. This high gain bandwidth along with a high open-loop gain of 130 dB enables accurate signal conditioning in systems with high closed-loop gain requirements, said National.

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

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

Product information: LMP7731, LMP7732, amplifiers and Amplifiers Made SimpleSM WEBENCH online design tool

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