'Step Attenuator' related articles 1

  1. 2009/06/15 ARA2004 - Reverse Amplifier with Step Attenuator
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 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.

*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

*MCNS/DOCSIS Compliant Cable Modems
*CATV Interactive Set-Top Box
*Telephony over Cable Systems
*OpenCable Set-Top Box
*Residential Gateway

ARA2004S12P1, ARA2004RS12P1

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