235 MHz, DC Coupled VGA and Differential Quad Output Amplifier
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.
- Multi-Channel Data Acquisition
- Positron Emission Tomography
- Gain Trim
- Industrial and Medical Ultrasound
- Radar Receivers
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This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
The AD8264-EVALZ board is shipped fully assembled and tested, and it provides basic functionality as shipped. Standard connectors enable the user to attach standard lab test equipment without having to wait for the rest of the design to be completed. See AD8264 data sheet available on line for complete details.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.