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New CMOS amplifiers with voltage noise like bipolar amplifiers

Posted: 14 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? cmos amplifier? amplifier? ltc6241? ltc6242?

Generally known for their low input bias current, CMOS amplifiers are inherently noisier than bipolar designs, said Linear Technology Corp. And to address this performance trade off, the company announced a new class of CMOS amplifiers with voltage noise like bipolar amplifiers.

With a low noise of 550nVp-p in the 0.1Hz to 10Hz region, the LTC6241 dual and LTC6242 quad amplifiers offer a threefold reduction in voltage noise over existing CMOS amplifiers. This performance, previously unattainable from a CMOS amplifier, delivers maximum signal resolution in a variety of high-end instrumentation, medical and communication applications requiring high impedance inputs. Not only do these amplifiers minimize a crucial error source, voltage noise, but they also provide excellent DC precision, said Linear Tech. These two new products feature 1pA bias current and less than 125?V input offset voltage. Offset voltage drift is guaranteed under 2.5?V/C while the high voltage gain of 124dB keeps system error to a minimum. The 18MHz gain bandwidth and 10V/?s slew rate at a low supply current of 2.2mA max per amplifier make these amplifiers extremely versatile and perfect for use in a wide variety of signal processing applications, added the company. In addition, the low input capacitance of 3pF makes them suitable for high source impedance applications.

"Both the LTC6241 and LTC6242 are the industry's lowest noise CMOS amplifiers. Prior to the release of these devices, designers requiring high input precision had to either compromise noise by using chopper-stabilized amplifiers or increase system cost with more expensive low noise bipolar and BiFET amplifiers. These devices put an end to the performance trade-off," said design manager Bill Jett. "For the first time, designers of high precision systems can obtain superb DC precision with unprecedented low noise at an affordable price."

Operating from supply voltages as low as 2.8V and up to 12V (HV version), the LTC6241 dual is offered in an 8-pin SOIC and 3-by-3mm DFN packages. The LTC6242 quad is available in a 16-pin SSOP package and 5-by-3mm DFN. Fully specified to operate over the commercial and industrial temperature ranges, 1,000-piece pricing starts at $1.25 each for the LTC6241 and $2.25 for the LTC6242.

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