TDA18251HN TDA8295HN TDA10023HN OM5785C

TDA18251HN Tuning for a new generation of DVRs and multimedia STBs Total DVR / multimedia STB system costs can be reduced

NXP silicon tuner TDA18251HN TDA18251HN Tuning for a new generation of DVRs and multimedia STBs Total DVR / multimedia STB system costs can be reduced dramatically with NXP Semiconductors 3rd generation of fully integrated silicon tuners. By incorporating all the key, and often costly, components on chip, the TDA18251HN TDA18251HN ensures you can easily and effectively meet industry demands for multi-tuner analog and digital video reception capabilities. It also offers ease-of-design and faster time-to-market, as well as helping you meet current and future performance requirements in HDTV and multimedia applications. Key benefits Ñ Highest performance levels for worldwide digital / analog cable TV reception - equal performance for master and slave tuners Ñ Lowest system cost - eliminates external RF splitter - no costly LNAs, SAW filters and incremental crystal oscillators required Ñ Easy on-board integration Ñ Smallest system PCB footprint Ñ Reduced external components Key features Ñ Full multistandard digital / analog cable reception Ñ Low power consumption Ñ Frequency coverage up to 1002 MHz Ñ All key tuning and RF features integrated on chip - tracking filters for unwanted signal rejection - IF selectivity (eliminating external SAW filters) - tuner alignment - integrated wide band gain control - oscillators with no external components - loop through Ñ Supports multi-tuner application without the need for an external RF splitter Ñ Four standby modes Key applications Ñ Standard and HD (High Definition) set-top-boxes Ñ Multimedia set-top boxes Ñ Home entertainment servers Ñ DVR (Digital Video Recording) By integrating all key tuning functions and RF and IF selectivity on chip, NXP's silicon tuner TDA18251HN TDA18251HN reduces BoM and simplifies design. The architecture also eliminates additional discrete image-rejection filter, RF filters and IF SAW filters. On-chip integration of all these functions enables 4 channel DVR and multimedia cable STB boxes to be easily developed without an external splitter. Targeted at digital and analog cable applications it supports watch, record, video on demand and in home video distribution functions. Used in conjunction with the TDA8295HN TDA8295HN (analog demodulator) and the TDA10023HN TDA10023HN (digital channel demodulator), the TDA18251HN TDA18251HN covers all worldwide digital and analog cable standards. Complete reference board points the way To help cable set-top box makers develop straightforward, cost-effective multi-tuner solutions, a DVR / multimedia STB front-end reference board OM5785C OM5785C is available. Featuring four TDA18251HN TDA18251HN silicon tuners, it also includes four TDA10023HN TDA10023HN QAM demodulators to support digital reception and four TDA8295HN TDA8295HN demodulators for analog cable TV reception. Each TDA10023HN TDA10023HN provides a transport stream output, while each TDA8295HN TDA8295HN provides a CVBS SSIFD output. The received signal spectrum is down-converted and filtered to low-IF signal, which directly feeds the input stage of the demodulator's A/D converter, without the need of conventional and costly external filtering. Operating on a 16 MHz crystal, the ICs buffered clock output can be used to provide the system clock to other tuners and channel decoders. The TDA18251HN TDA18251HN also integrates 3 RF outputs, called MTO (Multi Tuner Output), for driving up to 3 slave tuners. Via Multi-Tuner-Outputs, the master tuner provides Key Parameters (typical) Parameter Value Frequency range 41-1002 MHz Noise figure 7 dB Phase noise -85 dBc @ 10 kHz Power dissipation 800 mW (digital) 1000 mW (analog) CSO / CTB 57 / 63 dBc Image rejection 57 dBc Low Leakage 8 the RF signal and clock frequency to the slave tuners. This in turn feeds the clock frequency to both QAM and analog demodulators. Low profile shielding protects each tuner against EMI from the adjacent tuners and the environment. The user can control both QAM and analog demodulators via the I2C bus, and each QAM demodulator will then control the respective silicon tuner. Unit dBµV TS1 TS0 CVBS0 TS2 CVBS2 TS3 CVBS3 I2C MUX VSYNC IFOUT XTIN TDA8295HN TDA8295HN XTOUT VSYNC XTIN IFOUT AGC TDA10023HN TDA10023HN TDA8295HN TDA8295HN XTOUT VSYNC AGC TDA10023HN TDA10023HN TDA8295HN TDA8295HN IFOUT IFOUT TDA8295HN TDA8295HN XTOUT AGC TDA10023HN TDA10023HN XTOUT 3.3 V SUPPLY REGULATION AND FILTERING 1.2 V AGC TDA10023HN TDA10023HN VSYNC 1.8 V XTIN I2C IN CVBS1 TDA18251HN TDA18251HN TDA18251HN TDA18251HN TDA18251HN TDA18251HN TDA18251HN TDA18251HN SLAVE TUNER 1 MASTER TUNER SLAVE TUNER 2 SLAVE TUNER 3 MTO1 MTO2 MTO3 loop through RF input brb085 OM5785C OM5785C Multimedia DVR / Front End Reference Design www.nxp.com © 2007 NXP B.V. All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. Date of release: November 2007 The information presented in this document does not form part of any quotation or contract, is believed to be accurate and Document order number: 9397 750 16152 reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Printed in the Netherlands Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.