Differential Amplifier Drives dc-Coupled, Ground-Referenced 100MHz Signals with Low Noise & Low Distortion

Built on an advanced SiGe BiCMOS process, the LTC6409 features 10GHz gain-bandwidthproduct, 100dB SFDR up to 40MHz, and 1 percent settling time of 1.9ns. It isideal for driving the latest high speed ADCs such as the 1.8V 14-bit 150MspsLTC2262-14. The LTC6409 features wide input common mode range of 0 to 3.5V andoutput common mode range of 0.5 to 3.5V when using a single 5V supply, makingit easy to interface ground-referenced signals to differential pipeline ADCs.

Gain and feedback resistors are external, allowing the designer to configurethe exact gain needed for each application. The amplifier is unity gain stableand high output current of up to 95mA allows it to drive lower value feedbackand gain resistors, such as 150Ohm, resulting in very low output noise.

The LTC6409 is fully specified tooperate with either a 3 or 5V single supply. Despite its wide bandwidth and lownoise performance, supply current power consumption is just 56mA max and ashutdown mode reduces this to 500uA when turned off. Turn-on time is typically160ns.

The LTC6409 will find use in pulsed signal applications such as radar signalprocessing, imaging, high speed test and measurement and communicationsapplications.

The LTC6409 is available in a 2 x 3 mm QFN package, fully specified over theC- (0 to 70C),
I- (-40 to 85C) and H- (-40 to 125C) temperature grade ranges. Prices start at$4.50 each in 1,000 piece quantities.

Differential Amplifier Drives dc-Coupled, Ground-Referenced 100MHz Signals with Low Noise & Low Distortion_A