ADC driver offers high-speed performance

27 June 2007 Analogue, Mixed Signal, LSI

Linear Technology's new LTC6400-20 ADC driver achieves superb performance on a single 3 V supply. It includes a gain setting resistor, simplifying the challenge of driving the highest performance high-speed ADCs. It provides a fixed gain of 20 dB with -93 dBc third-order intermodulation distortion (IMD3) performance and noise figure of 6,5 dB for a 140 MHz input fre-quency. At 240 MHz, IMD3 is better than -70 dBc. The LTC6400-20 achieves this performance operating on a 3 V supply voltage, providing a differential output voltage swing of 4,4 V peak-to-peak. In addition to minimising power consumption, this eliminates the need for a separate 5 V supply in applications using the latest 3 V and 3,3 V ADCs. To further simplify interfacing to high speed ADCs such as the LTC2208, a VOCM pin sets the output common mode voltage to match the input range of the ADC. An optional on-chip filter helps to handle charge injection common to the capacitive inputs characteristic of pipelined ADCs. Inputs may be AC- or DC-coupled. While fully differential, the LTC6400-20 can be used to easily convert single-ended inputs to differential outputs. It is available in a tiny 3 mm x 3 mm QFN package.

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