easy and cost effective digital cable stb solution are you faced with the challenge of supporting high-performance emerging applications while still requiring analog loop-through capabilities for major markets like india and china? nxp semiconductors 3 rd generation, fully integrated silicon tuner tda18252hn helps you create high-performance, low-cost digital cable set-top box solutions for all markets. nxp silicon tuner tda18252hn key benefts lowers system cost by eliminating costly components ` such as low noise amplifers and saw flters fully meets sarft requirements ` supports single tuner receiver boxes and enables ` dvr confguration supports other world standards including scte-40, ` j-qam and nordig easy on-board integration ` reduced external component count ` smallest system pcb footprint, enabling further size ` reduction of application board offers optimized front end solution with tda10024hn ` (latest nxp qam demodulator) key features multi-standard digital cable reception ` low power consumption (< 800 mw) ` frequency coverage up to 1002 mhz ` fully integrated if selectivity, eliminating the need for ` external saw flters fully integrated oscillators with no external components ` on-chip loopthrough with analog capability ` input signal strength indicator and die temperature sensor ` (via i 2 c-bus) device standby modes to further reduce power consumption ` single 3.3 v power supply ` key applications dvb-c and digital cable set-top box applications ` dedicated to digital cable set-top box applications in fast growing asian markets like china and india, our highly integrated silicon tuner tda18252hn helps you reduce your total application bill-of-materials. simplifying your system design, the ic incorporates the tuning function along with the if selectivity - eliminating the need for discrete image-rejection, rf and if saw flters.
www.nxp.com ? 2008 nxp b.v. all rights reserved. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. no liability will be accepted by the publisher for any consequence of its use. publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights. date of release: march 2008 document order number: 9397 750 16486 printed in the netherlands front-end om3853c/c1 reference design ns om3853/c1 single cannel digital cable front-end reference design elps cable aers in cina deelop straigtforard and cost effectie receiers long it our 185n incorporating lo-profle sielding for mi protection it also features te m deodulator 1n e 1n controls te tuner gain by deliering te c control oltage for te m deodulator an on-board 18 supply oltage is aailable ? nim om3865c/c1 reference design our om3865/c1 lets you uicly ealuate te 185n in your eisting platfors it is pin-to-pin copatible it conentional can tuners currently used in te cinese aret brb168 rf in lt as sc ls da cp k vt k xt out_p xt out_n v if_agc if out_n if out_p xt al p xt al n synthesizer att lna stepped agc if agc bandpas s filter xtal osc if filter mixer level control i 2 c interf ace brb169 silicon tuner loop through rf input xt out if out agc i 2 c in ts 3.3 v suppl y regula tion and fil tering tda18252 tda10024 1.80 v the received signal spectrum is down-converted and ltered to low-if signal. this directly feeds the qam demodulator, without needing conventional high cost external ltering. the tda18252hn provides a low if frequency of 4 mhz from a 6 mhz bandwidth, 4.5 mhz from a 7 mhz bandwidth and 5 mhz from an 8 mhz bandwidth. working with a single 16 mhz crystal, the ic?s buffered clock output can provide the system clock for other tuners and for channel decoders. the tda18252hn also includes an integrated analog loop-through function. nxp offers a number of complete reference designs based on the tda18252hn, further reducing your time and effort when developing new set-top box solutions. key parameters parameter value (typical) reuency range 1 12 oise gure db pase noise 85 dbc 1 k power dissipation 8 m stb 5 dbc mage reection dbc ow leakage 8 dbv tda18252 block diagram
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