ARA1400S12

A FEATURES · · · · · · Low cost integrated monolithic GaAs amplifier and step attenuator with output disconnect switch. Meets DOCSIS distortion requirements at +60 dBmV Frequency range: 5 – 100 MHz Attenuation Range: 0 – 56 dB, variable in 4 dB steps 5 Volt operation Low distortion & Low noise figure APPLICATIONS · · · MCNS/DOCSIS Compliant Cable Modems CATV Interactive Set-Top Box Telephony over Cable Systems ARA1400S12 CATV Reverse Amplifier with Step Attenuator Advanced Product Information Rev. 2 28 1 S12 28 PIN SSOP PACKAGE DESCRIPTION The ARA1400S12 is a GaAs IC designed to perform 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. It is capable of meeting the MCNS/DOCSIS harmonic distortion specifications while only requiring a single polarity +5V supply. This part is a single ended design that does not require an output ABSOLUTE MAXIMUM RATINGS balun to achieve –52 dBc 2nd harmonic performance at +60 PARAMETER PARAMETER dBmV output levels. Both the V DD (P INS 4,12,17) 9 VD C input and output are matched to 75 ohms. The precision V RFIN (P INS 10, 26) 0 to -3 VD C attenuator provides up to 56 dB of attenuation in 4 dB ATTIN (3) ATTOUT (28)V 5 VD C increments. The ARA1400S12 V ISET (P INS 11, 27) 2 VD C is supplied in a 28-pin SSOP packag...