NXP公司的CX24109是高度集成的直接下變換數字衛星電視調諧器,適用于數字視頻,音頻和數據接收器.和CX24121 QPSK 解調器/FEC譯碼器,芯片組提供完整的寬帶衛星前端解決方案,能在最苛刻的衛星環境提供1-45MSps的速率,并和國際標準如DVB與DSS兼容.本文介紹了CX24109的主要特性,功能方框圖以及簡化的芯片組應用電路圖.

CX24109: Digital Satellite Tuner

The CX24109 is a highly integrated, direct down-conversion satellite tuner intended for high-volume digital video, audio, and data receivers. When combined with the CX24121 QPSK demodulator/FEC decoder, the chip set provides a complete broadband satellite front-end solution capable of operating from 1–45 MSps in the most demanding satellite environments. It is compatible with international standards such as DVB and DSS. The highly integrated CX24109 reduces the tuner BOM cost and simplifies the RF layout.

CX24109主要特性:

Zero-IF architecture eliminates the need for image reject filtering

Integrated LNA

Integrated LO with onboard VCO and synthesizer

Single +5 V supply

Reference oscillator output for demodulator

CX24109主要應用:

DBS set-top boxes

Commercial digital video, audio, and data receivers

Digital VCRs
 

                                                            圖1.CX24109功能方框圖

                                                           圖2.CX24109 QPSK解調應用方框圖

 

                                                           圖3.簡化CX24109應用電路圖(1/2)

 

                                                             圖4.簡化應用電路圖(2/2)