Features and Benefits
- 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)
- Gain range
- 0 to 24 dB (input to VGA output)
- 6 to 30 dB (input to differential output)
- Gain scaling: 20 dB/V
- Single-ended input and differential output
- Supplies: ±2.5 V to ±5 V
- Low power: 140 mW per channel at ±3.3 V
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.
- Multichannel data acquisition
- Positron emission tomography
- Gain trim
- Industrial and medical ultrasound
- Radar receivers
Product Lifecycle Recommended for New Designs
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.
Evaluation Kits (1)
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.
Sample & Buy
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