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AD8328ACPZ-REEL Datasheet(PDF) 1 Page - Analog Devices |
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AD8328ACPZ-REEL Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page 5 V Upstream Cable Line Driver AD8328 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 Supports DOCSIS and EuroDOCSIS standards for reverse path transmission systems Gain programmable in 1 dB steps over a 59 dB range Low distortion at 60 dBmV output −57.5 dBc SFDR at 21 MHz −54 dBc SFDR at 65 MHz Output noise level @ minimum gain 1.2 nV/√Hz Maintains 300 Ω output impedance Tx-enable and Tx-disable condition Upper bandwidth: 107 MHz (full gain range) 5 V supply operation Supports SPI interfaces APPLICATIONS DOCSIS and EuroDOCSIS cable modems CATV set-top boxes CATV telephony modems Coaxial and twisted pair line drivers FUNCTIONAL BLOCK DIAGRAM DIFF OR SINGLE INPUT AMP 8 8 8 AD8328 VIN+ VERNIER BYP GND RAMP POWER-DOWN LOGIC POWER AMP ATTENUATION CORE DECODE DATA LATCH SHIFT REGISTER VIN– SDATA CLK TXEN ZOUT DIFF = 300Ω VOUT– VOUT+ ZIN (SINGLE) = 800Ω ZIN (DIFF) = 1.6kΩ DATEN SLEEP Figure 1. GENERAL DESCRIPTION The AD83281 is a low cost amplifier designed for coaxial line driving. The features and specifications make the AD8328 ideally suited for MCNS-DOCSIS and EuroDOCSIS applications. The gain of the AD8328 is digitally controlled. An 8-bit serial word determines the desired output gain over a 59 dB range, resulting in gain changes of 1 dB/LSB. The AD8328 accepts a differential or single-ended input signal. The output is specified for driving a 75 Ω load through a 2:1 transformer. Distortion performance of −53 dBc is achieved with an output level up to 60 dBmV at 65 MHz bandwidth over a wide temperature range. This device has a sleep mode function that reduces the quiescent current to 2.6 mA and a full power-down function that reduces power-down current to 20 μA. The AD8328 is packaged in a low cost 20-lead LFCSP and a 20-lead QSOP. The AD8328 operates from a single 5 V supply and has an operational temperature range of −40°C to +85°C. FREQUENCY (MHz) –70 –68 –66 –64 –62 –60 –58 –56 –54 –52 –50 VOUT = 60dBmV @ MAX GAIN, THIRD HARMONIC VOUT = 60dBmV @ MAX GAIN, SECOND HARMONIC 5 1525 35 4555 65 Figure 2. Worst Harmonic Distortion vs. Frequency 1 Patent pending. |
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