mt8872c and MT8872P cofdm d emodulator /fec c onsumer and p rofessional dvb-t tv r eceiver and s et -t op b ox a pplications product brief m i c r o t u n e? the mt8872c is an ets 300 477- compliant integrated demodulator and forward error corrector (fec) for dvb terrestrial digital television receivers and set-top boxes. it accepts as data baseband or 1st if cofdm. the 1st if sampling option further decreases system cost. the 10-bit adc samples the incoming signal. the internal microprocessor locks to the ofdm signal fully automatically. the mt8872 can cope with very severe channel distortions due to its state-of-the-art channel estimation unit. the error correction unit corrects remaining errors and outputs a dvb common interface- compliant mpeg-2 transport stream. monitor functions optionally, data transfer to and from the internal blocks of the MT8872P can be provided directly from the pins (e.g., the filtered time-domain signal, the fft output, interpolated pilots and the equalized signal after the channel estimation unit). this enables real-time monitoring of channel characteristics for use in professional applications. applications ? dvb-t tv receivers ? dvb-t set-top boxes features ? integrated 10-bit adc ? 1st if input supported ? no vcxo required because of digital resampling techniques ? quick synchronization after channel switch (<70 ms) ? 6 mhz, 7 mhz, and 8 mhz channel-compliant with only one x-tal ? 8k and 2k modes ? digital afc ? hierarchical modulation supported ? ber, s/n, packet error, constellation diagram readout via i 2 c ? very small package (80 pins tqfp) ? tristatable serial or parallel mpeg output ? serial mpeg2transport stream output ? low power consumption (750 mw) ? excellent performance (in presence of echoes, co-channel, awgn ? real-time channel monitoring options for professional applications (sp8871p only) ? fft window ? constellation diagram ? pilot spectrum cofdm demodulator/fec mt8872c MT8872P
mt8872c and MT8872P cofdm d emodulator /fec c onsumer and p rofessional p roduct b rief dvb-t tv r eceiver and s et -t op b ox a pplications pb-00041 rev 1.0 ? may 2002 page 2 of 2 down converter gain saw gain rf cofdm mpeg2 transport stream if-agc a dc 1 if @ ~36 mhz st mt8872c 61 mhz rf-agc worldwide headquarters ? microtune, inc., 2201 tenth street, plano, tx 75074, usa ? tel: +1-972-673-1600, fax: +1-972-673-1602, e-mail: sales@microtune.com, web site: www.microtune.com for a detailed list of design centers, sales offices, and sales representatives, visit our web site at www.microtune.com . the information in this document is believed to be accurate and reliable. microtune assumes no responsibility for any consequen ces arising from the use of this information, nor from any infringement of patents or the rights of third parties which may result from its use. no license is granted by implication or otherwise under any paten t or other rights of microtune. the information in this publication replaces and supersedes all information previously supplied, and is subject to change without notice. the customer is responsible for assuri ng that proper design and operating safeguards are observed to minimize inherent and procedural hazards. microtune assumes no responsibility for applications assistance or customer product design. the devices described in this document are not authorized for use in medical, life-support equipment, or any other application involving a potential risk of severe property or environmental damage, personal injury, or death without prior express written approval of microtune. any such use is understood to be entirely at the user?s r isk. microtune, microtuner, microstreamer, videocaster, and the microtune logo are trademarks of microtune, inc. all other trademark s belong to their respective companies. microtune?s products are protected by one or more of the following u.s. patents: 5,625,325; 5,648,744; 5,717,730; 5,737,035; 5, 739,730; 5,805,988; 5,847,612; 6,100,761; 6,104,242; 6,144,402; 6,163,684; 6,169,569; 6,177,964; 6,218,899 and additional patents pending or filed. entire contents copyright ? 2002 microtune, inc. s specifications ? agc frequency: 0 to 1 mhz ? digital timing recovery accuracy: <1 ppm ? typical supply voltage: 2.5v ? nominal power dissipation: 0.8w ? input signal: differential baseband or 1st if cofdm ? output signal: mpeg2 transport stream ? control: via serial bus i 2 c compatible ? external clock frequency: 55 mhz, 61 mhz for 1st if ? package: quad flat pack, 80 pins (144 pins for sp8871p) ? ambient operating temperature: 0 to +70c ? ieee 1149.1 boundary scan performance ? co-channel carrier to interferer ratio: <-12 db ? awgn performance: <1 db loss ? echo performance: 0 db block diagram of mt8872c cofdm demodulator/fec
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