AD8367ARU Datasheet

Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps


The AD8367ARU is a high-performance 45 dB variable gain amplifierwith linear-in-dB gain control for use from low frequenciesup to several hundred megahertz. The range, flatness, and accuracyof the gain response are achieved using Analog Devices’X-AMP® architecture, the most recent in a series of powerfulproprietary concepts for variable gain applications, which farsurpasses what can be achieved using competing techniques.The input is applied to a 200 Ω resistive ladder network, havingnine sections each of 5 dB loss, for a total attenuation of 45 dB.At maximum gain, the first tap is selected; at progressively lowergains, the tap moves smoothly and continuously toward higherattenuation values. The attenuator is followed by a 42.5 dBfixed gain feedback amplifier—essentially an operational amplifierwith a gain bandwidth product of 100 GHz—and is verylinear, even at high frequencies. The output third order intercept is+20 dBV at 100 MHz (+27 dBm re 200 Ω), measured at anoutput level of 1 V p-p with VS = 5 V.The analg gain-control interface is very simple to use. It isscaled at 20 mV/dB, and the control voltage, VGAIN, runs from50 mV at –2.5 dB to 950 mV at +42.5 dB. In the inverse-gainmode of operation, selected by a simple pin-strap, the gaindecreases from +42.5 dB at VGAIN = 50 mV to –2.5 dB atVGAIN = 950 mV. This inverse mode is needed in AGC applications,which are supported by the integrated square-law detector,whose set point is chosen to level the output to 354 mV rms,regardless of the waveshape. A single external capacitor sets upthe loop averaging time.The AD8367 may be powered on or off by a voltage applied tothe ENBL pin. When this voltage is at a logic LO, the total powerdissipation drops to the milliwatt range. For a logic HI, the chippowers-up rapidly to its normal quiescent current of 26 mA at25°C. The AD8367 is available in a 14-lead TSSOpackage forthe industrial temperature range of –40°C to +85°C. AD8367ARU Features • Broad Range Analog Variable Gain–2.5 dB to +42.5 dB• 3 dB Cutoff Frequency of 500 MHz• Gain Up and Gain Down Modes• Linear-in-dB, Scaled 20 mV/dB• Resistive Ground Referenced InputNominal ZIN  200 • On-Chip Square-Law Detector• Single-Supply Operation: 2.7 V to 5.5 V AD8367ARU Applications • Cellular Base Station• Broadband Access• Power Amplifier Control Loops• Complete, Linear IF AGC Amplifiers• High-Speed Data I/O


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Manufacturer information


Atmel (Microchip Technology) - Atmel was acquired by Microchip in April 2016. Atmel Corporation is an industry leader in the design and manufacture of advanced semiconductors, with focus on microcontrollers, nonvolatile memory, logic, radio frequency (RF) components and sensors. These functions are marketed as standard products, application-specific standard products (ASSPs) or customer-specific products (ASICs) in order to provide a rapid and flexible response to the needs of Atmel’s customers.

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