Linear Technology’s new LTC6417 is a fully differential buffer amplifier with only 1,5 nV/√Hz output-referred noise. It is capable of driving a differential 50 Ω load and is optimised for driving 14- and 16-bit pipeline ADCs.
The IC can be DC- or AC-coupled at its inputs, and achieves excellent distortion performance for signals up to and 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.
Several features are included to simplify interfacing with ADCs: the LTC6417 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 device’s low-impedance output helps manage the capacitive charge injection common to pipeline ADCs. Fast output clamps can be programmed with a single pin to prevent ADC over-range conditions. An over-range pin signals when the clamps limit the output voltage. An output common mode pin makes it easy to match the LTC6417 output swing to the input range of the ADC.
The IC operates from a single 5 V supply. A PWRADJ pin enables the designer to trade off power consumption for HD3 performance. This feature dynamically lowers supply current from 123 mA to 74 mA, and a shutdown mode further reduces current consumption to 24 mA.
The LTC6417 is available in a 3 x 4 mm 20-lead QFN package with an easy to use flow-through pinout. It is fully specified for 0°C to 70°C and -40°C to 105°C (case temperature) operation ranges.
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