The AD8264 is a quad, linear-in-dB, general-purpose, variable gain amplifier (VGA) with a preamplifier (preamp), and a flexible differential output buffer. DC coupling, combined with wide bandwidth, makes this amplifier a very good pulse processor. Each channel includes a single-ended input preamp/VGA section to preserve the wide bandwidth and fast slew rate for low distortion pulse applications. A 6 dB differential output buffer with common-mode and offset adjustments enable direct coupling to most modern high speed analog-to-digital converters (ADCs), using the converter reference output for perfect dc matching levels. The −3 dB bandwidth of the preamp/VGA is dc to 235 MHz, and the bandwidth of the differential driver is 80 MHz. The floating gain control interface provides a precise linear-in-dB scale of 20 dB/V and is easy to interface to a variety of external circuits. The gain of each channel is adjusted independently, and all channels are referenced to a single pin, GNLO. Combined with a multioutput, digital-to-analog converter (DAC), each section of the AD8264 can be used for active calibration or as a trim amplifier. Operation from a bipolar power supply enables amplification of negative voltage pulses generated by current-sinking pulses into a grounded load, such as is typical of photodiodes or photomultiplier tubes (PMT). Delay-free processing of wideband video signals is also possible. Applications * Multichannel data acquisition * Positron emission tomography * Gain trim * Industrial and medical ultrasound * Radar receivers * Low noise * Voltage noise: 2.3 nV/√Hz * Current noise: 2 pA/√Hz * Wide bandwidth * Small signal: 235 MHz (VGAx); 80 MHz (output amplifier) * Large signal: 80 MHz (1 V p-p) https://elecena.pl/product/857884/quad-235-mhz-dc-coupled-vga-and-differential-output-amplifier 2009-06-08 https://elecena.pl/product/857884/quad-235-mhz-dc-coupled-vga-and-differential-output-amplifier 2018-03-29 https://elecena.pl/product/857884/quad-235-mhz-dc-coupled-vga-and-differential-output-amplifier 2025-01-21