CMOS op amps resemble bipolar amps

Milpitas, Calif. — Linear Technology Corp.'s new family of 50 μA CMOS amplifiers are said to deliver extraordinary DC precision at the lowest possible supply current.

With input DC characteristics similar to the best precision bipolar amplifiers, the LTC6078 dual and LTC6079 quad op amps offer a breakthrough combination of specifications that no other CMOS amplifier on the market can deliver, said Erik Soule, general manager for Linear's signal conditioning products.

Using a unique design architecture, the amplifiers boast a miniscule input offset voltage of 25 μV max and guaranteed offset voltage drift of 0.7 μV/°C max — while drawing only 55 μA per channel quiescent current. This implies a tenfold reduction in power consumption over existing op amps with similar DC accuracy, according to Soule.

Featuring a rail-to-rail input stage, the devices maintain their input precision over the entire common mode range. The low bias current of 1 pA max allows optimum DC accuracy with high source impedance and feedback resistors. In addition, a CMRR of 110dB and high voltage gain of 120dB preserve precision performance. Operating on a 2.V to 5.V supply range, the amplifiers' outputs swing rail-to-rail. Supply current is reduced to less than 2 μA using the shutdown feature.

The LTC6078 dual is offered in the 8-pin MSOP and 3mm x 3mm DFN packages. The LTC6079 quad is available in the 16-pin SSOP and 5mm x 3mm DFN packages.

Pricing starts at $1.49 each for the LTC6078 dual and $2.53 each for the LTC6079 quad in 1,000s. Click here for the LTC6078 data sheet. Click here for the LTC6079 data sheet.

Linear Technology , 1-800-454-6327,

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