The AD8264 is a 4-channel, linear-in-dB, general-purpose variable gain amplifier (VGA) with a preamplifier (preamp), and a flexible differential output buffer. Intended for a broad range of applications, dc coupling combined with wide band-width 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 multi-output, digital-to-analog converter (DAC), each section of the AD8264 can be used for active calibration or as a trim amplifier.
The gain range of the VGA section is 24 dB. Operation from a dual polarity power supply enables amplification of negative voltage pulses that are generated by current-sinking pulses into a grounded load, such as is typical of photodiodes or photo-multiplier tubes (PMT). Delay-free processing of wide-band video signals is also possible. The differential output amplifier permits convenient level shifting and interfacing to single-supply ADCs using the VOCM and OFSx pins.
The AD8264 is available in a 40-lead, 6 mm × 6 mm LFCSP with an operating temperature range of −40°C to +105°C.
|Title||Content Type||File Type|
|AD8264: Quad, 235 MHz, DC Coupled VGA and Differential Output Amplifier Data Sheet (Rev A, 01/2011) (pdf, 309 kB)||Data Sheets|
RF Source Booklet
(pdf, 815 kB)
RF IC Product Overview - Version O (11/2012)
|RAQs index||Rarely Asked Questions||HTML|
|What are Variable Gain Amplifiers (VGA's) and how are they used?||FAQs/RAQs||HTML|
|Glossary of EE Terms||Glossary||HTML|
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