PRODUCT DESCRIPTION
The ARA1400 is a GaAs IC 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. The device is capable of meeting the MCNS/DOCSIS requirements for harmonic performance at a +60dBmV output level while requiring only a single polarity +5V supply. Both the input and the output are single-ended and matched to 75 Ohms, and a precision attenuator provides up to 56 dB of attenuation in 4 dB increments. The device is offered in a 28-pin SSOP package featuring a heat slug on the bottom of the package.

FEATURES
• Low cost integrated monolothic GaAs amplifier with step attenuator
• Attenuation Range: 0-56 dB, adjustable in 4 dB increments via a 4 wire parallel control
• Meets DOCSIS distortion requirements at +60 dBmV output signal level
• Low distortion and low noise
• Frequency range: 5-100 MHz
• 5 Volt operation
• 0 to +85 °C temperature range

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