Datenblatt-Suchmaschine für elektronische Bauteile |
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AD8328ARQ Datenblatt(PDF) 1 Page - Analog Devices |
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AD8328ARQ Datenblatt(HTML) 1 Page - Analog Devices |
1 / 16 page REV. 0 a 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. 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., 2002 AD8328* 5 V Upstream Cable Line Driver 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 Output Impedance TX-Enable and Transmit-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 Driver GENERAL DESCRIPTION The AD8328 is a low cost amplifier designed for coaxial line driving. The features and specifications make the AD8328 ideally suited for MCNS-DOCSIS and Euro-DOCSIS applica- tions. 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 tempera- ture 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 package and a 20-lead QSOP package. The AD8328 operates from a single 5V supply and has an operational temperature range of –40 °C to +85 °C. FUNCTIONAL BLOCK DIAGRAM DIFF OR SINGLE INPUT AMP ATTENUATION CORE ZOUT DIFF = 300 8 8 8 ZIN (SINGLE) = 800 ZIN (DIFF) = 1.6k AD8328 DATEN SDATA CLK TXEN SLEEP VOUT+ VOUT– VIN+ VIN– VERNIER DECODE DATA LATCH SHIFT REGISTER POWER-DOWN LOGIC POWER AMP BYP GND RAMP 5 15 25 35 45 55 65 FREQUENCY – MHz VOUT = 60dBmV @MAX GAIN, THIRD HARMONIC VOUT = 60 dBmV @MAX GAIN, SECOND HARMONIC –70 –68 –66 –64 –62 –60 –58 –56 –54 –52 –50 Figure 1. Worst Harmonic Distortion vs. Frequency *Patent Pending |
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