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AD8321 датащи(PDF) 1 Page - Analog Devices |
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AD8321 датащи(HTML) 1 Page - Analog Devices |
1 / 20 page Gain Programmable a CATV Line Driver AD8321 FEATURES FUNCTIONAL BLOCK DIAGRAM Linear in dB Gain Response Over >53 dB Range Drives Low Distortion >11 dBm Signal into 75 � Load: VCC GND –53 dBc SFDR at 42 MHz APPLICATIONS Gain Programmable Line Driver HFC High Speed Data Modems Interactive CATV Set-Top Boxes CATV Plant Test Equipment AD8321 POWER- DOWN/ SWITCH INTER ATTENUATOR CORE INV DATA SHIFT REGISTER DATA LATCH PWR AMP DATEN CLK REVERSE AMP SDATA General Purpose IF Variable Gain Block DESCRIPTION The AD8321 is packaged in a low cost 20-lead SOIC, operates The AD8321 is a low cost digitally controlled variable gain from a single +9 V supply, and has an operational temperature amplifier optimized for coaxial line driving applications such as range of –40 ∞C to +85∞C. cable modems that are designed to the DOCSIS * (upstream) Very Low Output Noise Level Maintains Constant 75 � Output Impedance Power-Up and Power-Down Condition No Line Transformer Required VIN+ Upper Bandwidth: 235 MHz (Min Gain) VIN– 9V Single Supply Operation Power-Down Functionality Supports SPI Interface Low Cost VOUT PD standard. An 8-bit serial word determines the desired output gain over a 53.4 dB range, resulting in gain changes of 0.75 dB/LSB. –40 The AD8321 comprises a digitally controlled variable attenuator of 0 dB to –53.4 dB, which is preceded by a low noise, fixed –50 fO = VIN = (PIN = 4 137mV –15dB 2MHz p-p m) (POUT MAX = 11d GAIN) Bm @ HD3 HD2 gain buffer and followed by a low distortion high power ampli fier. The AD8321 accepts a differential or single-ended input signal. The output is specified for driving a 75 W load, such as coaxial cable, although the AD8321 is capable of driving other loads. Performance of –53 dBc is achieved with an output level up to 11 dBm at 42 MHz bandwidth using a 9 V supply. –60 –70 A key performance and cost advantage of the AD8321 results from the ability to maintain a constant 75 W output impedance during power-up and power-down conditions. This eliminates the need for external 75 W termination, resulting in twice the effective output voltage when compared to a standard opera tional amplifier, thus eliminating the need for a transformer. *Data-Over-Cable Service Interface Specifications REV. 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. Trademarks and registered trademarks are the property of their respective owners. –80 –90 0 8 16 24 32 40 48 56 64 72 GAIN CONTROL – Decimal Figure 1. Harmonic Distortion vs. Gain Control 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. |
Аналогичный номер детали - AD8321 |
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Аналогичное описание - AD8321 |
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