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sl5162 multistandard vhf and uhf television demodulator supersedes september 1996 edition, ds4497-2.1 ds4497-3.0 september 1998 the sl5162 multistandard modulator up-converts a baseband video signal with separate audio frequency input on to a vhf or uhf carrier up to 860mhz. it provides rf signals with negative or positive video modulation and am or fm sound subcarrier to satisfy both pal/ntsc and secam applications. the on-chip local oscillator uses an external resonator tank which may be controlled via any mitel 1.3ghz synthesiser. selection of both video and sound standards are provided by level switching of a single pin. a video agc circuit is provided to ensure constant modulation depth. in pal mode this may be disabled and a white clip circuit switched in to prevent overmodulation if desired. 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 rf1 rf2 v cc 2 loin1 loop1 loop2 loin2 v ee 2 st1 st2 agc video tsg v ee 1 op2 op1 mss sub2 v cc 1 audio sl5162 mp20 figure 1 pin connections C top view features n covers both negative and positive modulation sys- tems n internal agc with disable n control of sound and video standard via single pin n symmetrical 75 w rf outputs for low radiation n audio input with am/fm sound modulator n switchable video test signal generator (tsg) n intercarrier input for second sound channel n esd protection 2 55 c to 1 150 c 2 20 c to 1 150 c 2 10 c to 1 80 c 2 03v to 1 70 v 2 03v to 1 70v absolute maximum ratings storage temperature junction temperature ambient temperature supply voltage voltage at any other pin ordering information sl5162/kg/mp1s miniature plastic package sl5162/kg/mp1t tape and reel mixer driver fm/am select offset adjust uhf mixer audio osc fm agc agc clip clamp 75 video input uhf osc 5 6 4 7 13 19 20 uhf tank subcarrier 2 12 prescaler outputs 15 16 modulated outputs 9 10 sound tank 11 audio input 14 mode select tsg enable clip logic tsg 18 figure 2 block diagram
2 sl5162 electrical characteristics t amb = 1 25 c (operating range 2 10 c to 1 80 c), v cc = 1 5v, (operating range 1 45 to 1 55v). max and min values are guaranteed by either production test or design. they apply within the specified temperature and supply voltage ranges unless otherwise stated. supply voltage supply current video input video input level (v p ) eff. white clip level (v c ) input impedance video bandwidth 2 1 db 2 3db video snr weighted differential gain differential phase line tilt (black level) clamp accuracy audio input input impedance audio bandwidth ( 2 1db) subcarrier frequency fm thd intercarrier input input level fm performance audio input for 100% deviation ( 6 35khz) fm deviation sensitivity max frequency deviation am performance audio modulation depth audio snr (wideband) rf output peak vision carrier: secam (l) pal flatness band 470-860mhz apl d white level, nominal negative modulation sync tip negative modulation positive modulation sync degradation ( 1 ve mod) characteristic typ. conditions 45 05 10 25 60 15 4 250 . 46 12 45 10 117 100 62 6 2 6 2 25 05 140 100 07 80 83 84 17 100 6 1 55 53 15 6 5 6 5 05 5 7 10 2 6 2 22 units min. max. v ma vp-p vp-p v k w mhz mhz db % deg % mv k w khz mhz % mvp-p mvp-p khz/mv khz % db db m v db m v db % % % % % v p = sync to white level, agc disabled (note 1) v p = sync to white level, agc enabled v c = sync to limit level (note 2) except for duration of clamp pulse ccir rec 451-1 (note 3), mono sound system dependent upon video input clamp capacitor v p =10v d (black level with and without input video) determined by external components. in demodulated signal. input signal =1 khz sinewave at 6 35khz deviation to define 2 22dbc (peak carrier) at device input audio input 1khz sinewave no pre-emphasis, dependent on external components input = 200mvp-p at 1khz v p = 10v, sync = 03v differential 75 w output apl 10-90% relative to peak vision carrier (pvc), v p = 10v, all systems (note 4) all systems pin value 3, 12 3, 12 19 11 13 11 11 1, 2 1, 2 1,2 d sync 1 (1 6 3 3 100) s w 7 3 notes 1. this is the nominal input level to provide the preset video modulation index for the selected standard. any variation from th e nominal level will change the rf modulation index. 2. the actual clip level is set relative to the input video level. the level of 117v only applies if the video input signal is correctly proportioned. the white clip circuit operates only when the agc is disabled. 3. measured at ch38 with r&s emfp demodulator and uaf video analyser. 4. measured at ch21 with r&s emfp reference demodulator and uaf video analyser. synchronous demodulation.
3 sl5162 electrical characteristics (continued) characteristic typ. conditions 2 10 2 10 2 60 2 46 389 2 16 2 15 2 22 2 3 500 30 2 70 2 70 2 70 2 75 2 70 2 70 860 02 units min. max. dbc dbc dbc k w mvp-p dbc dbc dbc dbc dbc dbc dbc dbc dbc dbc mhz khz relative to pvc (note 4) relative to pvc, with no audio modulation applied relative to pvc single ended from 50 w values referred to pal system g carrier level note 5 relative to 83db m v modulated carrier (note 6) with 1vp-p video input signal colour bars pin value 18 1, 2 4,5,6,7 mod index control sound subcarrier level, negative video modulation sound subcarrier level, positive video modulation second sound subcarrier video test sig. generator negative impedance ceramic resonator impedance prescaler output amplitude distortions intermodulation: f v 1 (f s 2 f c ) f v 1 2f c f v 1 2f s f v 1 3f s spurious (in band) spurious (ex band) harmonics: 2f v 3f v sound in vision vision in sound local oscillator frequency range residual fm 1 2 3 4 5 6 7 8 9 1o 11 12 13 14 15 16 17 18 19 20 uhf prescaler output 1 uhf prescaler output 2 positive supply for uhf circuits uhf tank uhf tank uhf tank uhf tank uhf ground sound tank 1 sound tank 2 audio 1 input positive supply for baseband circuits intercarrier (sound) input video modulation/standard select 75 w modulated output 75 w modulated output baseband ground test signal generator input video input agc capacitor/disable switch rf 1 rf 2 v cc 2 loin 1 loop 1 loop 2 loin 2 v ee 2 st 1 st2 audio v cc 1 sub 2 mss op 1 op2 v ee 1 tsg vid agc pin name function notes 5. f v = vision carrier, f s = sound subcarrier, f c = chroma subcarrier. 6. sub 2 must be connected to v cc to achieve this performance. table 1 pin descriptions video input section a composite signal of the selected standard is applied to the device via a coupling capacitor also acting as the clamp storage capacitor. a minimum level clamp is used to dc restore the video signal in the ic to an internally defined reference voltage. the agc will give a constant output level with input signals between 05 and 15 vp-p. if a controlled 1vp-p video signal is available, the agc may be disabled, in which case a white clip circuit is switched in, to prevent possible overmodulation. selection of negative or positive modulation is via a single pin (14). the voltage on this pin controls an offset which is fed to the uhf mixer, thus determining both modulation depth, and sense of modulation. sound section the sound is ac coupled and am or fm modulated onto the pre-selected carrier, 45 - 65mhz; its level is nominally at 2 16db relative to the peak vision carrier. uhf modulated output modulation and relative levels of vision and sound carrier levels are preset for the selected broadcast standard. table 2 gives the output options available. modulation index is fixed at 83% for all negative modulation systems and at 94% for secam standard l. selection of sound tank frequency is defined by off-chip tank components.
4 sl5162 modulation video standard ntsc (m) pal (g) pal (i) secam (l) negative negative negative positive mod. index (%) sc freq. (mhz) sound modulation 83 83 83 94 45 55 60 65 fm fm fm am pre-emphasis ( m s) 75 50 50 through table 2 video modulation/standard selection figure 3 tsg waveform application notes the key to achieving acceptable modulator performance is to ensure a well planned circuit layout with good rf decoupling of all supplies and sensitive pins. ground loops should be avoided or kept as small as possible since rf coupling is the single most important characteristic in degrading modulator performance. where possible, double sided board with a ground plane should be used and care taken to decouple all sensitive pins as close to the device as possible. oscillator design and layout the oscillator layout should be kept as small as possible to minimise parasitics. it is also recommended that the ground plane is kept as far away from the oscillator itself since this will minimise the unwanted capacitance from the tank components to the ground plane. this has two advantages: 1. it increases the oscillator tuning range 2. it minimises the amount of rf coupled into the ground plane by the oscillator. the circuit diagram shown in figure 4 can be used for uhf or vhf applications. surface mount components should be used wherever possible since these will minimise parasitics and also allow a more compact circuit design. for applications at vhf the values of the tuning components must be modified: the coupling capacitors should be increased to a value of 22pf or greater. for fixed frequency applications up to 100mhz (or limited tuning range applications) 15pf coupling capacitors can be used. varactor tuning of the sl5162 should not be attempted unless the oscillator is synthesised, due to the wide temperature variation of varactor diodes. the application shown in figure 4 uses a mitel 1.3ghz tv synthesiser. this provides the required stability and tuning for the vco. any of the of the mitel media products i 2 c and 3-wire bus synthesisers such as sp5611, sp5502, sp5026 should be suitable for use with the sl5162 64 m s 4 m s 20 m s 4 m s 4 m s 12 m s 20 m s white black sync modulated outputs the routing of the modulated outputs requires special attention since these are particularly vulnerable to coupling from the vco: unwanted coupling of the lo frequency to the rf output will modify the modulation depth. typically, in instances where rf coupling is present, the amount of coupling (and the phase) will vary as the oscillator is tuned across the band, causing the modulation index to be either higher or lower than the situation where no rf coupling is present. thus the modulation index will vary as the device is tuned from one channel to another. for vhf and other applications below 500mhz, oscillator coupling is not such an issue, however similar care should still be taken with the layout in order to maximise device performance. use of a balun it is possible to further improve device performance with the use of a balun to remove the effects of common mode coupling. although using a balun will add to component cost, it may be the best way to achieve maximum performance at higher frequencies where common mode noise has made it impossible to achieve the required snr or dynamic range in the output signal. a low cost balun wound on a ferrite bead former should be sufficient to provide adequate performance in the majority of applications. sound tank circuit it is recommended that the sound tank shown in figure 4 is used. for pal g, ntsc or secam applications, the value of the inductor may be modified to achieve the required subcarrier frequency. the tank circuit can be tuned between 4mhz and 7mhz. the sound subcarrier is automatically gain controlled to a value which gives a 16db picture-to-sound carrier ratio when the sl5162 is set to negative modulation. the audio input signal is ac coupled through pin 11. the fm sensitivity of the of the sound section is 07khz/mv, therefore a 140mvp-p input signal should give a 6 50khz deviation of the sound subcarrier. stereo sound for stereo applications, a previously modulated second subcarrier should be input via the sub 2 input (pin 13). for example, with the german panda system, this would normally be at 574mhz. an input level of 200mv p-p should provide the required picture carrier/sound carrier ratio of 22db. video modulation/standard selection the sl5162 may be switched between negative and positive modulation standards via mss, pin 14. this configures both the sense of video modulation (negative or positive), and switches the modulation on the sound subcarrier to am when positive video modulation is selected. these standards are switched as shown in table 3. to ensure reliable startup over the entire v cc range it is recommended that the sound tank circuit is started via an effective pulse from the i 2 c bus synthesiser used in the system. this is shown in the demon- stration board circuit, figure 4. to do this, one of the test signal generator (tsg) the internal test signal generator is driven from a 500khz ceramic resonator. the tsg waveform is shown in figure 3 and has an effective input video amplitude of 1v sync tip to white. note that when tsg is enabled, the sound subcarrier modulation is disabled and so the audio is muted.
5 sl5162 open collector outputs is initially turned on. this is then released when the mode selection (pal/ntsc or secam) is made or at any other convenient point (e.g. when frequency data is sent) in pal/ntsc mode. as an example, to synthesise 47125mhz send the data words as shown in table 4. care must be taken to ensure that the mss pin is adequately decoupled as close to the pin as possible. the routing of any control line to this pin should also be layed out to ensure maximum separation from the lo components whilst still remaining as short as possible. in pal/ntsc (mono) applications, pin 13 (sub 2) may be left open circuit or decoupled to ground via a 1nf capacitor. in secam (mono) applications pin 13 must be directly connected to v cc to disable the intercarrier sound circuitry. for optimum performance it is recommended that in single ended output applications, pin15 is used for positive modulation, and pin 16 used for negative modulation. test signal generator (tsg) a tsg is provided which may be enabled by connecting a 500khz ceramic resonator via a 56pf capacitor to the tsg pin (pin 18) as shown in figure 4. the tsg is disabled by connecting pin 18 to ground. the waveform that the tsg produces (shown in figure 3) will create two white bars on a standard tv screen. it should be noted that standard (video) modulation depth specification for the sl5162 in its normal application does not apply to the tsg facility, since it is only intended as a tuning or test mode. agc/white clip the sl5162 is provided with an agc circuit which should ensure correct modulation depth provided a composite video signal between 05v and 15v sync tip to peak white is applied to the video input, pin 19. if desired, the agc may be disabled and a white clip circuit switched in to prevent overmodulation. this clipping level is set to a nominal 17% above peak white level, thus ensuring that even with a standard pal i 95% saturated, 100% amplitude colour bars test signal, no clipping should take place. the agc is enabled by connecting the pin 20 to ground via a 150nf capacitor; white clip is enabled by connecting a 16k w resistor from pin 20 to ground. c2 1d 74 ce b0 ce 10 stop address synthesiser msb frequency information lsb frequency information charge pump high mode, standard operation turn on port 5 to switch sound tank on resend of byte 4 turn on port 5, turn off port 4 (to configure sl5162 to pal/ntsc operation) stop bit (if required) data word description table 4 mss pin voltage 0v 5v fm am negative positive video modulation audio modulation table 3 r1 r2 r4 r5 r7 r8 r9 r10* r11* r12 r13 c1 c2 c3 c4 c5 c6 c7 c8 c9 c10 22k w 22k w 10k w 22k w 47k w 16k w 75 w 75 w 0 w 0 w 10k w 18pf 100pf 100pf 220nf 47nf 10nf - 56pf 100pf 10nf surface mount 1206 surface mount 1206 surface mount 1206 surface mount 1206 surface mount 1206 surface mount 1206 surface mount 1206 surface mount 1206 surface mount 0805 surface mount 1206 surface mount 1206 surface mount 0805 100v cog surface mount 1206 surface mount 1206 surface mount 1206 surface mount 1206 surface mount 1206 bb515 varactor diode surface mount 0805 surface mount 0805 surface mount 1206 circuit ref. value type c11 c12 c13 c14 c15 c16 c17 c18 c19 c20 c21 c22 c23 c24 c25 c26 c27 c28 c29 c30 10nf 10nf 150pf 33nf 47 m f 150nf 680nf 56pf 10nf 10nf 100pf 1 m f 10nf 220nf 100pf 100pf 15pf 15pf 15pf 15pf surface mount 1206 surface mount 1206 surface mount 1206 surface mount 1206 electrolytic 01 inch pitch surface mount 1206 (x7r) 02 inch pitch leaded capacitor surface mount 1206 surface mount 0805 surface mount 0805 surface mount 1206 electrolytic 01 inch pitch surface mount 1206 surface mount 1206 surface mount 1206 surface mount 1206 surface mount 0603 surface mount 0603 surface mount 0603 surface mount 0603 circuit ref. value type *not fitted table 5 sl5162 demonstration board components parts list contd
6 sl5162 sk1-4 p1-2 p5 lk1 sw1 ic1 ic2 - - - - - - - bnc straight square socket 3-way pcb header 2-way pcb header link 2 3 spst dil switch mitel sp5611 mitel sl5162 circuit ref. value type tr1 l1 l2 l3 x1 x2 - 56 m h - - 4mhz 500khz npn transistor, bcw31, sot23 toko choke 1 turn 5mm diameter 22 swg 2 turns 5mm diameter 22 swg iqd crystal ceramic resonator circuit ref. value type table 5 sl5162 demonstration board components parts list (continued) figure 4 sl5162 demonstration board figure 5 demonstration board layout ic2 sl5162 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 c16 150n r8 16k sw1/p3 sw1/ p4 c17 680n c17 680n c18 56p x2 500khz r9 75 sk1 sk2 video i/p rf o/p c19 100p c20 100p r10 75 1 5v 1 5v p5/lk1 c21 100p sk4 sk3 sub 2 audio i/p c22 1 m ic1 sp5611 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 1 5v c23 10n c3 47n r7 22k c2 220n tr1 bcw31 r4 10k r5 22k c6 10n c24 220n 1 30v 1 5v p1 c3 100p p2 data clock c1 18p x1 4mhz c2 100p gnd c26 100p r2 22k c10 10n c11 10n c27 c12 10n c25 100p 15p c28 15p c29 15p c30 15p l3 2t l2 1t c9 100p c8 56p r7 47k c7 bb 515 r13 10k c13 150p l1 56 m h c15 47 m c14 33n
7 sl5162 ic2 sl5162 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 150n 680n 56p 500khz 75 video i/p rf o/p 100p 100p 75 1 5v audio i/p 1 m ic1 sp5611 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 1 5v 10n 47n 22k 220n bcw31 10k 22k 10n 220n 1 30v 1 5v 100p sda scl 18p 4mhz 100p 22k 10n 10n 10n 15p 15p 15p 15p 2t 1t 100p 56p 47k bb 515 150p 47 m 33n 56 m h figure 6 pal (mono) application prescaler outputs rf oscillator agc sound tank 50 50 1 2 v cc 1ma 7 4 v cc v cc 5 6 v ref 120 120 5k 5k v cc 1k 1k 9 10 20 v cc v cc figure 7 i/o interface circuits contd
8 sl5162 customer service centres l france & benelux les ulis cedex tel: (1) 69 18 90 00 fax: (1) 64 46 06 07 l germany munich tel: (089) 419508-20 fax: (089) 419508-55 l italy milan tel: (02) 6607151 fax: (02) 66040993 l japan tokyo tel: (03) 5276-5501 fax: (03) 5276-5510 l korea seoul tel: (2) 5668141 fax: (2) 5697933 l north america scotts valley, usa tel: (408) 438 2900 fax: (408) 438 5576/6231 this publication is issued to provide information only which (unless agreed by the company in writing) may not be used, applied or reproduced for any purpose nor form part of any order or contract nor to be regarded as a representation relating to the products or services concerned. no warranty or guarantee express or implied is made regard ing the capability, performance or suitability of any product or service. the company reserves the right to alter without prior notice the specification, design or price of any product or service. information con cerning possible methods of use is provided as a guide only and does not constitute any guarantee that such methods of use will be satisfactory in a specific piece of equipment. it is the user's responsibility to f ully determine the performance and suitability of any equipment using such information and to ensure that any publication or data used is up to date and has not been superseded. these products are not suitable for use in any medical products whose failure to perform may result in significant injury or death to the user. all products and materials are sold and services provided subject to the company's conditions of sale, w hich are available on request. all brand names and product names used in this publication are trademarks, registered trademarks or trade names of their respec tive owners. internet: http://www.mitelsemi.com ? mitel 1998 publication no. ds4497 issue no. 3.0 september 1998 technical documentation C not for resale. printed in united k ingdom l south east asia singapore tel: (65) 333 6193 fax: (65) 333 6192 l sweden stockholm tel: 46 8 702 97 70 fax: 46 8 640 47 36 l taiwan, roc taipei tel: 886 2 25461260 fax: 886 2 27190260 l uk, eire, denmark, finland & norway swindon tel: (01793) 726666 fax: (01793) 518582 these are supported by agents and distibutors in major countries worldwide. 25k 5p 11 v ref 1ma 13 v ref 10k 10k 75 w modulated outputs mss video mod/standard select test signal generator video input 18 56k v cc 250 m a 8k v cc 19 6k 250 m a 6k 6k 2k 50 2nd subcarrier input audio input v cc 15 16 48 48 125ma 125ma 50 50 60k v cc 14 v cc 60k 60k 60k 45k 50k figure 7 i/o interface circuits (continued)
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