Rail-to-rail op amp realizes 180MHz at 1mA

Analog Designline Europe (11/13/2009 4:48 AM ET)

Linear Technology's SiGe process has been used to manufacture its latest op amps, which consume 1mA maximum supply current per amplifier to produce 180MHz gain-bandwidth and 90V/µs slew rate.

The LTC6246, LTC6247 and LTC6248 are single, dual and quad devices respectively. Designed to provide the best speed/power efficiency available in a rail-to-rail amplifier, Linear says that it has not sacrificed DC performance – input offset voltage is specified at 500µV max and open loop gain is 45V/mV. These parts all use bias current cancellation to realise a 350nA input bias current over most of the input common mode voltage range. The result is that they can be used in applications with high source resistance, such as portable instrumentation and other battery-powered or heat-constrained precision systems.

The LTC6246 family, which is available in commercial, industrial and high temperature grade packages, boasts a shutdown feature to reduce current consumption to 42µA in a SOT-23 6-lead single and MSOP-10 dual version. The dual LTC6247 comes in a 2 x 2 x 0.55mm package, plus MSOP-8 and SOT-23 8-lead packages. Meanwhile, the LTC6248 is available in a 16-lead MSOP package. For more information, visit Linear Technology's website.