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AD8367-EVAL Fiches technique(PDF) 1 Page - Analog Devices |
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AD8367-EVAL Fiches technique(HTML) 1 Page - Analog Devices |
1 / 16 page REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD8367 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2001 500 MHz, Linear-in-dB VGA with AGC Detector FUNCTIONAL BLOCK DIAGRAM GAUSSIAN INTERPOLATOR AD8367 VPSO VPSI HPFL ICOM DECL VOUT ENBL OCOM DETO GAIN MODE INPT ICOM ICOM SQUARE LAW DETECTOR gm CELLS 9-STAGE ATTENUATOR BY 5dB BIAS 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 On-Chip Square-Law Detector Single-Supply Operation: 2.7 V to 5.5 V APPLICATIONS Cellular Base Station Broadband Access Power Amplifier Control Loops Complete, Linear IF AGC Amplifiers High-Speed Data I/O GENERAL DESCRIPTION The AD8367 is a high-performance 45 dB variable gain ampli- fier with linear-in-dB gain control for use from low frequencies up to several hundred megahertz. The range, flatness, and accu- racy 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 200 Ω resistive ladder network, having nine sections each of 5 dB loss, for 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 ampli- fier 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 interface is very simple to use. It is scaled at 20 mV/dB, and the control voltage, VGAIN, runs from 50 mV at –2.5 dB to 950 mV at +42.5 dB. In the inverse-gain mode of operation, selected by a simple pin-strap, the gain decreases from +42.5 dB at VGAIN = 50 mV to –2.5 dB at VGAIN = 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 up the loop averaging time. The AD8367 may 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. X-AMP is a registered trademark of Analog Devices, Inc. |
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Description similaire - AD8367-EVAL |
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