NXP公司的CX24109是高度集成的直接下變換數(shù)字衛(wèi)星電視調(diào)諧器,適用于數(shù)字視頻,音頻和數(shù)據(jù)接收器.和CX24121 QPSK 解調(diào)器/FEC譯碼器,芯片組提供完整的寬帶衛(wèi)星前端解決方案,能在最苛刻的衛(wèi)星環(huán)境提供1-45MSps的速率,并和國(guó)際標(biāo)準(zhǔn)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(jiǎn)化的芯片組應(yīng)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(yīng)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(diào)應(yīng)用方框圖

 

                                                           圖3.簡(jiǎn)化CX24109應(yīng)用電路圖(1/2)

 

                                                             圖4.簡(jiǎn)化應(yīng)用電路圖(2/2)