10/28/03 rev 0.12 motorola semiconductor technical data product brief single chip cmos broadband tuner the mc44c800/801 silicon tuner ics are highly integrated single chip broadband tuners for cable data and set - top applications. they receive 50 mhz to 861 mhz cabl e signals and convert them to a second if of 36 mhz to 46 mhz. typical applications include cable data modems, cable digital and analog settop boxes, voip telephony boxes, etc. these tuners meet all docsis requirements for 64 and 256 qam. they utiliz e a double conversion architecture with an external first if saw filter at 1120 mhz, and a second if in the range of 36 mhz to 46 mhz. both the mc44c800 and the MC44C801 are identical, with the exception that the MC44C801 has a bus programmable variable g ain lna with 21 db of gain control. the mc44c800 does not have the lna. a summary of the features is given below: integrated frequency synthesizers and prescalers. one fully integrated vco and one vco requiring only an external inductor. up conversion m ixer. down conversion mixer. variable gain lna with 21 db gain control (MC44C801 only). reference oscillator circuit (using an external 25 mhz crystal). minimum ctb of ? 66 dbc, cso of ? 60 dbc and xmod of ? 57 db with +3 dbmv agc attack point. typical noise figure of MC44C801 is 6.2 db. phase noise @ 10 khz offset of ? 94 dbc/hz, typical. single 5 v supply operation. spi bus interface. internal self - diagnostic circuits. power down mode with fast start - up. no external image filter required. tqfp48ep package exposed pad 0.50 mm pitch 1 47 46 45 44 43 42 41 40 39 38 37 13 14 15 16 17 18 19 20 21 22 23 24 2 3 4 5 6 7 8 9 10 11 12 36 35 34 33 32 31 30 29 28 27 26 25 48 vss mixom1 mixop1 vss vss rfbypass 7 8 9 10 11 12 vss vss vss vdd3.6 vss vss ss sclk so vss xtal1 xtal2 lf2 vss vdd3.6 vss ldtest si vss l2 l1 vss vdd3.6 lf2rtn vss mixom2 mixop2 vss rfin2p rfin2m vss rbias rbiasrtn refop refom vdd3.6 3.3bypass rfin1p rfin1m vdd5 reg3.6cntl vdd5 vss mc44c800/801 pin connections mc44c800/801 silicon tuner ic ordering information device version temp. range package mc44c800fta non - lna - 10 c to +75 c tqfp 48 ep MC44C801fta lna - 10 c to +75 c tqfp 48 ep
mc44c800/801 _ __________________________________________________________________________ 2 of 4 rev 0.12 ? mc44c800/801 1 functional descr iption the simplified block diagrams below shows the major sections of the ic. input frequency range is 50 to 861 mhz. on the MC44C801, the gain of the internal lna is set via the spi bus depending on the input signal level. the mc44c800 utilizes an ext ernal variable gain device. the signal is then up converted to 1120 mhz and passed through the first if filter. the filtered signal is then routed back on chip where it is downconverted to the second if frequency. additional filtering, gain and agc are n eeded before the signal enters the demodulator. 2 absolute maximum ratings symbol parameter min max unit vdd3.6 3.6 v supply voltage 3.8 v vdd5 5.0 v supply voltage 5.5 v ta operating ambient temperature - 10 75 c tstg storage temperature - 65 150 c 3 electrical characteristics 3.1 specification conditions: unless otherwise stated: vdd = 5.0 v & 3.6 v, t amb. = 25 c. parameter min. typical max. units notes vdd3.6 @ 3.6 v 3.49 3.6 3.71 volts vdd3.6 total supply current 82 ma all sections active vdd 3.6 power down mode 18.4 ma vdd5 @ 5.0 v 4.75 5.0 5.25 volts vdd5 total supply current 245 ma including lna vdd5 power down mode 5.6 ma 3.2 power supply voltage connections the power supplies connections for this part can be configured in two d ifferent ways. both 3.6 v and 5 v power supplies can be connected to the part or just a 5 v power supply can be connected and the internal tracking regulator will provide the 3.6 v. the internal tracking regulator requires an external 2n2222 pass transis tor. the power supply tolerance requirements are different depending on this configuration, as shown in the table below. supply vdd3.6 tolerance vdd5 tolerance 3.6 v and 5 v supplies used + 3% + 5% only 5v supply used n/a + 3%
mc44c800/801 _ __________________________________________________________________________ 3 of 4 rev 0.12 ? mc44c800/801 4 overall tuner character istics, mc44c800 4.1 electrical specifications unless otherwise stated: vdd = 5.0v & 3.6v, t amb. = 25 c. parameter min. typ. max. units frequency rf 50 861 mhz conversion gain 30 db ssb noise figure at max gain 8 9 db passband gain flatness, + 2 mhz from center + 0.5 db lo sideband noise @ 10 khz - 94 dbc/hz lo sideband noise @ 100 khz - 100 dbc/hz cso, +3 dbmv attack, 137 chan @ +15 dbmv - 60 - 64 db ctb, +3 dbmv attack, 137 chan @ +15 dbmv - 66 - 68 db crossmodulation, +3 dbmv attack, 137 c han @ +15 dbmv - 57 - 59 db second if image rejection - 63 db 4.2 reference design block diagram vco bpf vco dual synth osc 50 - 861 mhz 1120 mhz 1st if 36 to 46 mhz 25 mhz mixer spi if output mc44c800 simplified reference tuner. rf input mixer 4:1 balun bpf simple lc filter 5 v 5 v transistor amplifier 1:1 balun hpf lpf upstream side of diplexer motorola silicon tuner ic pad
mc44c800/801 _ __________________________________________________________________________ 4 of 4 rev 0.12 ? mc44c800/801 5 overall tuner characteristics, MC44C801 5.1 electrical specifications unless otherwise stated: vdd = 5.0v & 3.6v, t amb. = 25 c. parameter min. typ. max. units frequency rf 50 861 mhz conversion gain 38 db gain control range 21 db ssb noise figure at max lna step 6.2 db passband gain flatness, + 2 mhz from center + 0.5 db lo sideband noise @ 10 khz - 94 dbc/hz lo sideband noise @ 100 khz - 100 dbc/hz cso - 66 db ctb - 63 db crossmodulation - 58 db second if image rejection - 68 db 5.2 reference design block diagram a complete MC44C801 reference design is available. contact motorola sales for details. vco bpf vco dual synth osc 50 - 861 mhz 1120 mhz 1st if 36 to 46 mhz 25 mhz amp mixer spi if output MC44C801 simplified reference tuner. rf input mixer 4:1 balun bpf simple lc filter 5 v 5 v transistor amplifier 1:1 balun hpf lpf upstream side of diplexer motorola silicon tuner ic motorola reserves the right to make changes without further notice to any products herein to improve reliability, function or design. motorola does not assume an y liability arising out of the application or use of any product or circuit described herein; neither does it convert any license under its patent rights of others. motorola products are not authorized for use as components in life support devices or syst ems intended for surgical implant into the body or intended to support or sustain life. buyer agrees to notify motorola of any such intended end use whereupon motorola shall determine availability and suitability of its products for the use intended. mot orola and are registered trademarks of motorola, inc. motorola, inc. is an equal employment opportunity/affirmative action employer.
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