High Current Driver Amplifier and Digital VGA/Preamplifier with 3 dB Steps
The AD8260 includes a high current driver, usable as a transmitter, and a low noise, digitally programmable variable gain amplifier (DGA), useable as a receiver, combined in a 5 mm × 5 mm, 32-lead chip scale package.
The receiver section consists of a single-ended input preamplifier, and linear-in-dB, differential-output VGA. Usable at dc and frequencies to 80 MHz; the –3 dB bandwidth is 180 MHz. The driver-amplifier delivers ±300 mA, well suited for driving low impedance loads, even when connected to a 3.3 V supply.
The AD8260 DGA is ideal for trim applications and has a gain span of 30 dB, in 3 dB steps. Excellent bandwidth uniformity is maintained across the entire frequency range. The DGA’s low output-referred noise is advantageous in driving high speed ADCs. The differential output facilitates the interface to modern low voltage high speed ADCs.
Single-supply and dual-supply operation makes the part versatile and enables gain control of negative-going pulses, such as generated by photodiodes or photo-multiplier tubes, as well as processing band-pass signals on a single supply. For maximum dynamic range, it is essential that the part be ac-coupled when operating on a single supply.
The AD8260 preamplifier (PrA) is user configurable with external resistors for gains greater than 6 dB; as with any high frequency op amp, the gain is inverting or noninverting. The DGA is characterized with a noninverting PrA gain of 2×. The attenuator has a range of 30 dB and the output amplifier has a gain of 8× (18.06 dB). The lowest noninverting gain range is −6 dB to +24 dB and shifts up with increased PrA gain. The gain is controlled via a parallel port (Pin GNS0 to Pin GNS3) with 10 gain steps of 3 dB per code. For any nonused code, the preamplifier and DGA are disabled.
The AD8260 can operate with single or dual supplies from 3.3 V to ±5 V. An internal buffer normally provides a split supply reference for single-supply operation; an external reference can also be used when the VMID buffer is shut down.
The operating temperature range is −40°C to +105°C. The AD8260 is available in a 32-lead LFCSP.
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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
The AD8260-EVALZ board is shipped fully assembled, tested and provides basic functionality as shipped. Connectors enable the user to connect standard types of lab test equipment without having to wait for the rest of the design to be completed. See the AD8260 data sheet on-line for complete instruction.
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.