Process boosts op amp performance

Santa Clara, Calif. — National Semiconductor Corp. today rolled out nine operational amplifiers (op amps) based on its VIP50 BiCMOS process that are said to feature improvements in accuracy, power consumption and voltage noise for industrial, medical, automotive and portable applications.

Five low-power, low-voltage amplifiers, the LPV531, LMV654, LMV792, LMV796 and LMV797, tout world-class, gain-bandwidth product performance.

The LMV654 quad amplifier, for example, provides 50 percent power savings over competing devices, according to National. It consumes 400 microamps, while maintaining a 12-MHz unity-gain bandwidth and a low input referred noise voltage of 17 nV/√ Hz. The amp, housed in a 14-lead TSSOP, provides an input offset voltage of less than 1.5 millivolts, 100 dB common mode rejection ratio (CMRR) and 95 dB power supply rejection ratio (PSRR).

The LMV792 series features noise of 5.8 nV/√ Hz and low input bias currents of 100 femtoAmps (fA) across a wide temperature range (-40°C to 125°C).

National is adding four precision amplifiers to its VIP50 portfolio — LMP7704, LMP7712, LMP7715 and LMP7716. The single, dual and quad amplifiers provide sub-220 microvolts of input offset with guaranteed input bias of less than 50 picoamps (pA), and up to 12-volt operation.

The LMP7712 dual amplifier offers low current (50 fA) metal oxide silicon (MOS) inputs while providing less than 6 nV/√ Hz performance.

The LMP7704 quad precision amp, which is available in a 14-lead TSSOP, operates from 2.7-V to 12-V supply voltages and has rail-to-rail CMOS inputs with input-bias currents of 200 fA.

The LMV792, LMV796 and LMV797 low-noise, CMOS input, dual operational amplifiers offer 5.8 nV/√ Hz of flat band noise. Their low offset voltage of less than 1.35 millivolts and low temperature co-efficient of less than 1.8 uV/° C are said to improve overall system accuracy. The LMV792 is available in a 10-lead MSOP package. The LMV796 and LMV797, offered in 5-lead SOT23 and 8-lead MSOP packages, target applications where system shutdown replaces localized shutdown requirements.

These nine products are designed on National's VIP50 technology, a silicon-on-insulator BiCMOS process with trimmable, highly-accurate thin-film resistors. National introduced the first six amplifiers manufactured on this process in September 2005.

Typical Application Circuit (LPV531)

All nine new products are available now with prices ranging from 75 cents to $2.49 in 1,000-unit quantities. Click here for the data sheets.

National Semiconductor Corp. , 1-800-272-9959,

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