ARA05050RS12P1

ara05050 Reverse Amplifier with Step Attenuator Data Sheet - Rev 2.5 features Low Cost Integrated Monolothic GaAs Amplifier With Step Attenuator Attenuation Range: 0-30 dB, Adjustable In 2dB Increments Via a 4 Wire Parallel Control Meets DOCSIS Distortion Requirements at +58dBmV Output Signal Level Low Distortion and Low Noise Low Signal toNoise Ratio at All Gain Levels Frequency Range: 5-100 MHz 5 Volt Operation RoHS-Compliant Package Option applications MCNS/DOCSIS Compliant Cable Modems s12 package CATV Interactive Set-Top Box 28 pin ssop with Heat slug OpenCable Set-Top Box Fiber Nodes Cable Modem Termination Systems (CMTS) product description The ARA05050 is a GaAs IC designed to provide the performance at a +58dBmV output level while requiring r e v e r s e p a t h a m p l i fi c a t i o n a n d o u t p u t l e v e l c o n t r o l only a single polarity +5V supply. Both the input functions in a CATV Set-Top Box or Cable Modem. and the output are single-ended and matched to 75 It incorporates a digitally controlled precision step Ohms. The precision attenuator provides up to 30 dB attenuator that is preceded by an ultra low noise of attenuation in 2 dB increments. The ARA05050 is amplifier stage, and followed by an ultra-linear output offered in a 28-pin SSOP package that features a heat d r i v e r a m p l i fi e r. T h i s d e v i c e i s c a p a b l e o f m e e t i n g slug on the bottom of the package, and is available in the MCNS/DOCSIS requirements for harmonic a RoHS-compliant option. 4 Attenuation Control Upstream ARA05050 LPFLPF Balun QPSK/16QAM Switch RAM ROM Modulator Clock Data Transmit Enable/Disable Microcontroller 5-42 MHz MAC with Ethernet MAC Clock Data 44 MHz Double- QAM Receiver 54-860 MHz SAW RJ45 10Base-T Diplexer Conversion with FEC Connector Filter Transceiver Tuner figure 1. cable Modem or set t op Box application diagram 08/2008ara05050 RF ATT ATT RF OUT1 IN OUT IN2 30 dB, 2dB step digital attenuator section A1 A2 RF RF IN OUT2 I 16 dB 8 dB 4 dB 2 dB I SET1 SET2 figure 2: functional Block diagram 1 N/C N/C 28 Bypass 2 N/C 27 ATTIN ATTOUT 3 26 RFOUT1 ISET2 4 25 VREF1 RFIN2 5 24 ATTACG1 ATTACG2 6 23 ATTACG1 ATTACG2 7 22 ATTACG1 ATTACG2 8 21 ATTACG2 ATTACG1 9 20 10 RFIN VREF2 19 ISET1 RFOUT2 11 18 VATT GND 12 17 16 dB 2 dB 13 16 8 dB 4 dB 14 15 figure 3: pinout Data Sheet - Rev 2.5 2 08/2008