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AD8369 데이터시트(PDF) 1 Page - Analog Devices |
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AD8369 데이터시트(HTML) 1 Page - Analog Devices |
1 / 24 page REV. 0 AD8369 45 dB Digitally Controlled VGA LF to 600 MHz 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. Trademarks and registered trademarks are the property of their respective companies. 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 © 2002 Analog Devices, Inc. All rights reserved. FUNCTIONAL BLOCK DIAGRAM BIAS GAIN CODE DECODE FILT VPOS PWUP SENB DENB BIT3 BIT0 BIT2 BIT1 OPHI OPLO CMDC COMM COMM INLO INHI Gm CELLS 3dB STEP FEATURES Digitally Controlled Variable Gain in 3 dB Steps –5 dB to +40 dB (RL = 1 k ) –10 dB to +35 dB (RL = 200 ) Less than 0.2 dB Flatness over a +20 MHz Bandwidth up to 380 MHz 4-Bit Parallel or 3-Wire Serial Interface Differential 200 Input and Output Impedance Single 3.0 V–5.5 V Supply Draws 37 mA at 5 V Power-Down <1 mA Maximum APPLICATIONS Cellular/PCS Base Stations IF Sampling Receivers Fixed Wireless Access Wireline Modems Instrumentation OPHI and OPLO. The overall gain depends upon the source and load impedances due to the resistive nature of the input and output ports. Digital control of the AD8369 is achieved using either a serial or a parallel interface. The mode of digital control is selected by connecting a single pin (SENB) to ground or the positive sup- ply. Digital control pins can be driven with standard CMOS logic levels. The AD8369 may be powered on or off by a logic level applied to the PWUP pin. For a logic high, the chip powers up rapidly to its nominal quiescent current of 37 mA at 25ºC. When low, the total dissipation drops to less than a few milliwatts. The AD8369 is fabricated on an Analog Devices proprietary, high performance 25 GHz silicon bipolar IC process and is available in a 16-lead TSSOP package for the industrial temperature range of –40 ∞C to +85∞C. A populated evaluation board is available. PRODUCT DESCRIPTION The AD8369 is a high performance digitally controlled variable gain amplifier (VGA) for use from low frequencies to a –3 dB frequency of 600 MHz at all gain codes. The AD8369 delivers excellent distortion performance: the two-tone, third-order intermodulation distortion is –69 dBc at 70 MHz for a 1 V p-p composite output into a 1 k W load. The AD8369 has a nominal noise figure of 7 dB when at maximum gain, then increases with decreasing gain. Output IP3 is +19.5 dBm at 70 MHz into a 1 k W load and remains fairly constant over the gain range. The signal input is applied to pins INHI and INLO. Variable gain is achieved via two methods. The 6 dB gain steps are implemented using a discrete X-AMP ® structure, in which the input signal is progressively attenuated by a 200 W R-2R ladder network that also sets the input impedance; the 3 dB steps are implemented at the output of the amplifier. This combination provides very accurate 3 dB gain steps over a span of 45 dB. The output imped- ance is set by on-chip resistors across the differential output pins, |
유사한 부품 번호 - AD8369_15 |
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유사한 설명 - AD8369_15 |
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