Product category:
Analogue and Mixed Signal ICs
News Release from: Analog Devices | Subject: AD8260
Edited by the Electronicstalk Editorial
Team on 07 February 2008
VGA integrates output driver and pre-amp
Digitally programmable variable gain amplifier is designed for driving signals over power lines, cables and other applications with low impedance.
A new digitally programmable VGA (variable gain amplifier) with transmit driver from Analog Devices is claimed to set a new standard of performance for driving signals over power lines, cables and other applications with low impedance The AD8260 operates on a single 3.3V power supply and has a transmit driver that produces +/-200mA output up to 100kHz, and greater than +/-100mA above that frequency
This article was originally published on Electronicstalk on 14 Sep 2001 at 8.00am (UK)
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This is an improvement over competing solutions using a discrete VGA, output driver and pre-amp, which consume 90% more board space, and require multiple power supplies.
The AD8260 VGA operates at -3dB bandwidth of 200MHz and includes a 30dB gain range digitally adjustable in 3dB gain steps providing the headroom needed for losses introduced in various cabling systems.
The new VGA features 2.4nV/(rt)Hz input voltage noise and driver with a built-in gain of 1.5, which is ideal for converting DAC (digital-to-analogue convertor) differential output signals to a voltage that can directly drive very low impedances.
The AD8260 can fully drive a 10ohm load with 2V peak-peak at 10MHz.
In addition, the chip dissipates just 93mW of power, which is less than half that of competing devices.
The AD8260 includes a high-current driver, usable as a transmitter, and a low-noise digitally programmable VGA, which is useable as a receiver, combined in a 5 x 5mm chip-scale package.
The receiver section consists of a single-ended input preamplifier and linear-in-decibels, differential-output VGA.
The differential output facilitates the interface to modern low-voltage, high-speed ADCs (analogue-to-digital convertors).
Versatile single- and dual-supply operation allow gain control of negative-going pulses, such as generated by photodiodes or photomultiplier tubes, and allows for the processing of band-pass signals on a single supply.
The AD8260 preamplifier is user-configurable with external resistors for gains greater than 6dB.
The driver is set up to be driven by modern current output DACs, like the high-speed AD9742 12bit, 3.3V supply DAC.
The AD8260 is sampling now, with full volume production scheduled for March 2008.
The AD8260 is available in a 32-Lead LFCSP (lead-frame chip-scale package) over the extended industrial temperature range -40 to +105C and is priced at US $3.79 in 1000-unit quantities.
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