The AD8335 is a quad variable gain amplifier (VGA) with low noise preamplifier intended for cost and power sensitive applications. Each channel features a gain range 48 dB, fully differential signal paths, active input preamplifier matching, and user-selectable maximum gains of 46 dB and 38 dB. Individual gain controls are provided for each channel. The preamplifier (PrA) has a single-ended to differential gain of x8 (18.06 dB) and accepts input signals 625 mV p-p. PrA noise is 1.2 nV/Hz and the combined input referred voltage noise of the PrA and VGA is 1.3 nV/Hz at maximum gain.