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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ARA2004 데이터시트(PDF) 1 Page - ANADIGICS, Inc |
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ARA2004 데이터시트(HTML) 1 Page - ANADIGICS, Inc |
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1 / 20 page  07/2005 ARA2004 Reverse Amplifier with Step Attenuator Data Sheet - Rev 2.1 FEATURES • Low Cost Integrated Amplifier with Step Attenuator • Attenuation Range: 0-58 dB, adjustable in 1 dB increments via a 3 wire serial control • Meets DOCSIS distortion requirements at +60 dBmV output signal level • Low distortion and low noise • Frequency range: 5-100 MHz • 5 Volt operation • -40 to +85 oC temperature range • RoHS Compliant Package Option APPLICATIONS • MCNS/DOCSIS Compliant Cable Modems • CATV Interactive Set-Top Box • Telephony over Cable Systems • OpenCable Set-Top Box • Residential Gateway PRODUCT DESCRIPTION The ARA2004 is designed to provide the reverse path amplification and output level control functions in a CATV Set-Top Box or Cable Modem. It incorporates a digitally controlled precision step attenuator that is preceded by an ultra low noise amplifier stage, and followed by an ultra-linear output driver amplifier. This device uses a balanced circuit design that exceeds the MCNS/DOCSIS requirement for harmonic Figure 1: Cable Modem or Set Top Box Application Diagram S12 Package 28 Pin SSOP with Heat Slug Diplexer ARA2004 SAW Filter Double- Conversion Tuner MAC Upstream QPSK/16QAM Modulator QAM Receiver with FEC Balun Low Pass Filter Transmit Enable/Disable Enable Data Clock Microcontroller with Ethernet MAC RAM ROM 10Base-T Transceiver RJ45 Connector Clock Clock Data Data 54-860 MHz 44 MHz 5-42 MHz performance at a +60 dBmV output level while only requiring a single polarity +5 V supply. Both the input and output are matched to 75 ohms with an appropriate transformer. The precision attenuator provides up to 58 dB of attenuation in 1 dB increments via a three-wire serial interface. With external passive components, this device meets IEC 1000-4-12 and ANSI/IEEE C62.41-1991 100KHz ringwave tests, as well as IEC1000-4-5 1.2/50 µS surge tests. The ARA2004 is offered in a 28-pin SSOP package featuring a heat slug on the bottom of the package. |
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