CX24128

Set-top Box Solutions Satellite Digital Satellite Dual Tuner RF IC CX24128 Industry’s First Dual Tuner for DVR Applications Conexant’s portfolio includes a comprehensive suite of semiconductor solutions for broadband communications, enterprise networks and the digital home. The CX24128 is Conexant’s innovative dual stream direct down-conversion satellite tuner RF IC intended for high-volume digital video, audio, and data receivers. The CX24128 offers excellent phase noise performance and very low implementation loss, required for advanced modulation systems such as 8PSK and DVB-S2. The CX24128 provides bill of materials (BOM) savings over two single tuners and simplifies layout for DVR set-top boxes (STBs). The CX24128 has a built-in auto-tuning machine that eliminates the need for software calibration routine and accelerates the calibration time. The on-chip fractional synthesizers enable fine frequency step size without adversely affecting lock time. The CX24128 requires a single 3.3 V power supply and has an improved power supply rejection ratio (PSRR) that reduces the need for power supply conditioning components required for proper operation. The CX24128 does not require a Balun, thus reducing external BOM cost. Its highly integrated design saves valuable board space and simplifies RF layout. Distinguishing Features w PLL Dividers, Phase Detector and Charge Pump Variable Low AGC Pass Filter Amplifier State of the art isolation between two channels I Channel Output...