Differential buffer amplifier offers low noise

Differential buffer amplifier offers low noise

The LTC6417 fully differential buffer amplifier offers an output-referred noise of 1.5 nV/√Hz. It is well suited for driving high speed 14- and 16-bit pipeline ADCs with input signals from dc to beyond 600 MHz.

At 140 MHz, OIP3 is 46 dBm, and HD3 is –69 dBc with 2.4 Vp-p output swing into a 50 Ω load. The device is configured internally as a unity gain buffer. Because its input impedance is 18.5 kΩ, additional gain can be achieved by applying a 1:4 or 1:8 transformer at the inputs.

The LTC6417 operates from a single 5 V supply. A PWRADJ pin enables the designer to trade off power consumption for HD3 performance. This feature lowers supply current from 123 to 74 mA, and a shutdown mode further reduces current consumption to 24 mA.

Housing is in a 3 x 4 mm 20-lead QFN package with an easy to use flow-through pinout and operating temperature is from 0° to 70°C and –40° to 105°C (case temperature). (From $3.89 ea/1,000 — available now)

By Christina Nickolas

Linear Technology , Milpitas , CA
Sales Office 408-428-2050
www.linear.com