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AD8367ARUZ1 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD8367ARUZ1 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 24 page 500 MHz, Linear-in-dB VGA with AGC Detector AD8367 Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved. 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 input Nominal ZIN = 200 Ω On-chip, square-law detector Single-supply operation: 2.7 V to 5.5 V APPLICATIONS Cellular base stations Broadband access Power amplifier control loops Complete, linear IF AGC amplifiers High speed data I/O FUNCTIONAL BLOCK DIAGRAM VPSI 12 VPSO 11 ENBL 2 DETO 6 GAIN 5 MODE 4 ICOM 14 ICOM 1 INPT 3 ICOM 7 DECL 9 HPFL 13 VOUT 10 OCOM 8 9-STAGE ATTENUATOR BY 5dB GAUSSIAN INTERPOLATOR BIAS SQUARE LAW DETECTOR gm CELLS AD8367 Figure 1. GENERAL DESCRIPTION The AD8367 is a high performance 45 dB variable gain amplifier with linear-in-dB gain control for use from low frequencies up to several hundred megahertz. The range, flatness, and accuracy of the gain response are achieved using Analog Devices’ X-AMP® architecture, the most recent in a series of powerful proprietary concepts for variable gain applications, which far surpasses what can be achieved using competing techniques. The input is applied to a 9-stage, 200 Ω resistive ladder network. Each stage has 5 dB of loss, giving a total attenuation of 45 dB. At maximum gain, the first tap is selected; at progressively lower gains, the tap moves smoothly and continuously toward higher attenuation values. The attenuator is followed by a 42.5 dB fixed gain feedback amplifier—essentially an operational amplifier with a gain bandwidth product of 100 GHz—and is very linear, even at high frequencies. The output third order intercept is +20 dBV at 100 MHz (+27 dBm, re 200 Ω), measured at an output level of 1 V p-p with VS = 5 V. The analog gain-control input is scaled at 20 mV/dB and runs from 50 mV to 950 mV. This corresponds to a gain of −2.5 dB to +42.5 dB, respectively, when the gain up mode is selected and +42.5 dB to −2.5 dB, respectively, when gain down mode is selected. The gain down, or inverse, mode must be selected when operating in AGC in which an integrated square-law detector with an internal setpoint is used to level the output to 354 mV rms, regardless of the crest factor of the output signal. A single external capacitor sets up the loop averaging time. The AD8367 can be powered on or off by a voltage applied to the ENBL pin. When this voltage is at a logic LO, the total power dissipation drops to the milliwatt range. For a logic HI, the chip powers up rapidly to its normal quiescent current of 26 mA at 25°C. The AD8367 is available in a 14-lead TSSOP package for the industrial temperature range of −40°C to +85°C. |
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