SL5162

SL5162 ZARLINK | Alldatasheet

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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. RF1 RF2 VCC 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 – 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 75Ω 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 255°C to1150°C 220°C to1150°C 210°C to180°C 20·3V to 17·0 V 20·3V to 17·0V 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 VIDEO INPUT UHF OSC UHF TANK SUBCARRIER 2 PRESCALER OUTPUTS MODULATED OUTPUTS SOUND TANK

11 AUDIO

14 MODE

ELECTRICAL CHARACTERISTICS

TAMB = 125°C (operating range 210°C to180°C), VCC = 15V, (operating range14·5 to15·5V). 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 Eff. white clip level (VC ) Input impedance Video bandwidth 21 dB 2 3dB Video SNR weighted Differential gain Differential phase Line tilt (black level) Clamp accuracy Audio Input Input impedance Audio bandwidth (21dB) Subcarrier frequency FM THD Intercarrier Input Input level FM Performance Audio input for 100% deviation (635kHz) 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 (1ve mod) Characteristic Typ. Conditions 4·5 0·5 250 .46 1·0 1·17 100 0·5 140 100 0·7 100 5·5 1·5 0·5 1·0 Units Min. Max. V mA Vp-p Vp-p V k Ω MHz MHz dB deg mV k Ω kHz MHz mVp-p mVp-p kHz/mV kHz dB dBµV dBµV dB V P = sync to white level, AGC disabled (note 1) VP = sync to white level, AGC enabled VC = 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=1·0V D (black level with and without input video) Determined by external components. In demodulated signal. Input signal =1 kHz sinewave at 635kHz deviation To define 222dBC (peak carrier) At device input Audio input 1kHz sinewave No pre-emphasis, dependent on external components Input = 200mVp-p at 1kHz V P = 1·0V, sync = 0·3V Differential 75Ω output APL 10-90% Relative to peak vision carrier (PVC), V P = 1·0V, all systems (note 4) All systems Pin Value 3, 12 3, 12 1, 2 1, 2 1,2 DSYNC1(16 3 3100)S W NOTES 1. This is the nominal input level to provide the preset video modulation index for the selected standard. Any variation from the nominal level will change the RF modulation index. 2. The actual clip level is set relative to the input video level. The level of 1·17V 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.

ELECTRICAL CHARACTERISTICS (continued) Characteristic Typ. Conditions 210 210 260 246 38·9 216 215 222 500 270 270 270 275 270 270 860 0·2 Units Min. Max. dBC dBC dBC k Ω 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 50Ω Values referred to PAL system G carrier level Note 5 Relative to 83dBµV modulated carrier (note 6) With 1Vp-p video input signal colour bars Pin Value 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 V1(fS2fC ) fV12fC fV12fS fV13fS Spurious (in band) Spurious (ex band) Harmonics: V 3fV Sound in vision Vision in sound Local Oscillator Frequency range Residual FM 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 75Ω modulated output 75Ω 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. fV = vision carrier, fS = sound subcarrier, fC = chroma subcarrier. 6. SUB 2 must be connected to VCC 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 0·5 and 1·5 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, 4·5 - 6·5MHz; its level is nominally at 216dB 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.

NTSC (M) PAL (G) PAL (I) SECAM (L) Negative Negative Negative Positive Mod. index (%) SC freq. (MHz) Sound Modulation 4·5 5·5 6·0 6·5 FM FM FM AM Pre-emphasis ( µs) 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 2·2pF 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 2C and 3-wire bus synthesisers such as SP5611, SP5502, SP5026 should be suitable for use with the SL5162 64µs µs µs µs µs µs µs 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 0·7kHz/mV, therefore a 140mVp-p input signal should give a 650kHz 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 5·74MHz. 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 2C 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.

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 471·25MHz 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 0·5V and 1·5V 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 1·6k Ω resistor from pin 20 to ground. CE CE 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 FM AM Negative Positive Video modulation Audio modulation Table 3 R10* R11* R12 R13 C10 22k Ω 22k Ω 10k Ω 22k Ω 47k Ω 1·6k Ω 75 Ω 75 Ω 0 Ω 0 Ω 10k Ω 18pF 100pF 100pF 220nF 47nF 10nF 5·6pF 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 47µF 150nF 680nF 56pF 10nF 10nF 100pF 1µF 10nF 220nF 100pF 100pF 1·5pF 1·5pF 1·5pF 1·5pF Surface mount 1206 Surface mount 1206 Surface mount 1206 Surface mount 1206 Electrolytic 0·1 inch pitch Surface mount 1206 (X7R) 0·2 inch pitch leaded capacitor Surface mount 1206 Surface mount 0805 Surface mount 0805 Surface mount 1206 Electrolytic 0·1 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…

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 regarding 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 concerning 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 fully 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, which are available on request. All brand names and product names used in this publication are trademarks, registered trademarks or trade names of their respective owners. Internet: http://www.mitelsemi.com © Mitel 1998 Publication No. DS4497 Issue No. 3.0 September 1998 TECHNICAL DOCUMENTATION – NOT FOR RESALE. PRINTED IN UNITED KINGDOM 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

11 VREF

75Ω modulated outputs MSS video mod/standard select Test signal generatorVideo input 5·6k VCC 250µA VCC 6k250µA 6k2k50 2nd subcarrier input Audio input VCC 1·25mA1·25mA 50 50 60k VCC VCC 60k 60k60k 45k 50k Figure 7 I/O interface circuits (continued)

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