View TDA4470-DSD_7096946.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

tda4470-d preliminary information telefunken semiconductors rev. a1, 28-aug-96 1 (16) multistandard video-if and quasi parallel sound processing description the tda4470 is an integrated bipolar circuit for multi- standard video/sound if (vif/sif) signal processing in tv/vcr and multimedia applications. the circuit processes all tv video if signals with negative modulation (e.g., b/g standard), positive modulation (e.g., l standard) and the am, fm/nicam sound if signals. features 5 v supply voltage; low power consumption active carrier generation by fpll principle (frequency-phase-locked-loop) for true synchronous demodulation very linear video demodulation, good pulse response and excellent intermodulation figures vco circuit operates at picture carrier frequency, the vco frequency is switchable for l'-mode alignment-free afc without external reference circuit, polarity of the afc curve is switchable vif-agc for negative modulated signals (peak sync. detection) and for positive modulation (peak white/ black level detector) tuner agc with adjustable take over point alignment-free quasi parallel sound (qps) mixer for fm/nicam sound if signals intercarrier output signal is gain controlled (necessary for digital sound processing) complete alignment-free am demodulator with gain controlled af output separate sif-agc with average detection two independent sif inputs parallel operation of the am demodulator and qps mixer (for nicam-l stereo sound) package and relevant pinning is compatible with the single standard version tda4472, which simplifies the design of an universal if module package: sdip28, so28 ordering information extended type number package remarks TDA4470-DSD sdip28 tda4470-dflg3 so28 delivery in taped form
tda4470-d telefunken semiconductors rev. a1, 28-aug-96 preliminary information 2 (16) block diagram ?? ?? ? ? ? ? ? ? agc (vif) tuner agc ? ? ? ?? ?? ? ? ? ? agc (sif) ? ? ? ? ? ? ? ? ? ? 11 10 tuner ? ? ? ? ? ? ? ? ? ? 27 28 3 1 2 ? 5 sif 2 sif 1 vco + phase shift afc standard supply ? ? ? ? l' switch vco 21 20 18 loop filter 14 ? offset comp. (optional) 26 fpll 0 90 vif amp 6 7 8 15 vif c agc c bl take over point sif input switch c agc 22 12 4,9,16 13 standard switch 23 v s ?? ?? 17 c ref intercarrier (fm / nicam) 24 fm det. am det. sif amp 25 af (am) afc video 95 10851 ? video det. control ? ? 19 afc switch ?? ?? ? figure 1. block diagram
tda4470-d preliminary information telefunken semiconductors rev. a1, 28-aug-96 3 (16) circuit description vision if amplifier the video if signal (vif) is fed through a saw filter to the differential input (pin 6-7) of the vif amplifier. this amplifier consists of three ac-coupled amplifier stages. each differential amplifier is gain controlled by the auto- matic gain control (vif-agc). the output signal of the vif amplifier is applied to the fpll carrier generation and the video demodulator. tuner-and vif-agc at pin 8, the vif-agc charges/discharges the agc capacitor to generate a control voltage for setting the gain of the vif amplifier and tuner in order to keep the video output signal at a constant level. therefore, in the case of all negative modulated signals (e.g., b/g standard) the sync. level of the demodulated video signal is the criterion for a fast charge/discharge of the agc capacitor. for positive modulation (e.g., l standard) the peak white level of video signal controls the charge current. in order to reduce reaction time for positive modulation, where a large time constant is needed, an additional black level detector controls the discharge current in the event of decreasing vif input signal. the control voltage (agc voltage at pin 8) is transferred to an internal control signal, and is fed to the tuner agc to generate the tuner agc current at pin 11 (open collector output). the take over point of the tuner agc can be adjusted at pin 10 by a potentiometer or an external dc voltage (from interface circuit or microprocessor). fpll, vco and afc the fpll circuit (frequency phase locked loop) consists of a frequency and phase detector to generate the control voltage for the vco tuning. in the locked mode, the vco is controlled by the phase detector and in unlocked mode, the frequency detector is superimposed. the vco operates with an external resonance circuit (l and c par- allel) and is controlled by internal varicaps. the vco control voltage is also converted to a current and repre- sents the afc output signal at pin 22. at the afc switch (pin 19) three operating conditions of the afc are pos- sible: afc curve arisingo or afallingo and afc aoffo. a practicable vco alignment of the external coil is the adjustment to zero afc output current at pin 22. at center frequency the afc output current is equal to zero. furthermore, at pin 14, the vco center frequency can be switched for setting to the required l' value (l' standard). the optional potentiometer at pin 26 allows an offset compensation of the vco phase for improved sound quality (fine adjustment). without a potentiometer (open circuit at pin 26), this offset compensation is not active. the oscillator signal passes a phase shifter and supplies the in-phase signal (0 ) and the quadrature signal (90 )of the generated picture carrier. video demodulation and amplifier the video if signal, which is applied from the gain controlled if amplifier, is multiplied with the inphase component of the vco signal. the video demodulator is designed for low distortion and large bandwidth. the demodulator output signal passes an integrated low pass filter for attenuation of the residual vision carrier and is fed to the video amplifier. the video amplifier is realized by an operational amplifier with internal feedback and 8 mhz bandwidth (3 db). a standard dependent dc level shift in this stage delivers the same sync. level for positive and negative modulation. an additional noise clipping is provided. the video signal is fed to vif-agc and to the video output buffer. this amplifier with a 6 db gain offers easy adaption of the sound trap. for nominal video if modulation the video output signal at pin 12 is 2 v pp. sound if amplifier and sif-agc the sif amplifier is nearly identical with the 3-stage vif amplifier. only the first amplifier stage exists twice and is switchable by a control voltage at pin 3. therefore with a minimal external expense it is possible to switch between two different saw filters. both sif inputs features excellent cross-talk attenuation and an input impedance which is independent from the switching condition. the sif-agc is related to the average level of am- or fm-carrier and controls the sif amplifier to provide a constant sif signal to the am demodulator and qps mixer. am demodulator the alignment-free am demodulator is realized by a synchronous detector. the modulated sif signal from the sif amplifier output is multiplied in phase with the limited sif signal (am is removed). the af signal of the demodulator output is fed to the output amplifier and to the sif-agc. for all tv standards with negative video modulation (e.g., b/g standard), the af output signal (pin 25) is switched off by the standard switch. quasi-parallel-sound (qps) mixer the qps mixer is realized by a multiplier. the sif signal (fm or nicam carrier) is converted to the intercarrier frequency by the regenerated picture carrier (quadrature signal) which is provided from the vco. the intercarrier signal is fed via an output amplifier to pin 24.
tda4470-d telefunken semiconductors rev. a1, 28-aug-96 preliminary information 4 (16) standard switch to have equal polarity of the video output signal the polarity can be switched in the demodulation stage in accordance with the tv standard. additional a standard dependent dc level shift in the video amplifier delivers the same sync. level. in parallel to this, the correct vif-agc is selected for positive or negative modulated vif signals. in the case of negative modulation (e.g., b/g standard) the am output signal is switched off. for positive modu- lation (l standard) the am demodulator and qps mixer is active. this condition allows a parallel operation of the am sound signal and the nicam-l stereo sound. l' switch with a control voltage at pin 14 the vco frequency can be switched for setting to the required l' value (l' standard). also a fine adjustment of the l'-vco center frequency is possible via a potentiometer. the l' switch is only active for positive modulated video if-signals (standard switch in l mode). afc switch the afc output signal at pin 22 can be controlled by a switching voltage at pin 19. it is possible to select an afc output signal with a rising- or falling afc curve and to switch off the afc. vcr mode for the vcr mode in a tv set (external video source selected), it is recommendable to switch off the if circuit. with an external switching voltage at pin 6 or 7, the if amplifiers are switched off and all signal output levels at pins 12, 24, and 25 are according to the internal dc voltage. internal voltage stabilizer the internal bandgap reference ensures constant perfor- mance independent of supply voltage and temperature.
tda4470-d preliminary information telefunken semiconductors rev. a1, 28-aug-96 5 (16) pin description 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 tda 4470d v i,sif1 gnd c agc v i,sif1 v sw v i,vif v i,vif c agc gnd r top i tun v o,vid v sw v sw v i,sif2 v i,sif2 r comp v o,am v o,fm v s v afc v vco v vco v sw c ref gnd c bl lf 94 8680 figure 2. pinning pin symbol function 1, 2 v i , sif1 sif1 input (symmetrical) 3 v sw input selector switch 4, 9, 16 gnd ground 5 c agc sif-agc (time constant) 6, 7 v i, vif vif input (symmetrical) 8 c agc vif-agc (time constant) 10 r top take over point, tuner agc 11 i tun tuner agc output current 12 v o,vid video output 13 v sw standard switch 14 v sw l' switch 15 c bl black level capacitor 17 c ref internal reference voltage 18 lf loop filter 19 v sw afc switch 20, 21 v vco vco circuit 22 v afc afc output 23 v s supply voltage 24 v o , fm intercarrier output 25 v o, am af output am sound 26 r comp offset compensation 27, 28 v i, sif2 sif 2 input (symmetrical)
tda4470-d telefunken semiconductors rev. a1, 28-aug-96 preliminary information 6 (16) absolute maximum ratings reference point pin 4 (9, 16), unless otherwise specified parameters symbol value unit supply voltage pin 23 sdip28 package so28 package v s v s 9.0 6.0 v v supply current pin 23 i s 93 ma power dissipation sdip28 package so28 package p p 840 560 mw mw output currents pins 12, 24 and 25 i out 5 ma external voltages pins 1, 2, 5 to 8, 10, 12, 14, 17, 18 and 24 to 28 pins 15, 20 and 21 pin 11 pins 3, 13, 19 and 22 v ext +4.5 +3.5 +13.5 v s v v v v junction temperature t j +125 c storage temperature t stg 25 to +125 c electrostatic handling *) all pins v esd 300 v *) equivalent to discharging a 200 pf capacitor trough a 0 resistor. operating range parameters symbol value unit supply voltage range pin 23 sdip28 package so28 package v s v s 4.5 to 9.0 4.5 to 6.0 v v ambient temperature t amb 10 to +85 c thermal resistance parameters symbol maximum unit junction ambient, when soldered to pcb sdip28 package so28 package r thja r thja 55 75 k/w k/w
tda4470-d preliminary information telefunken semiconductors rev. a1, 28-aug-96 7 (16) electrical characteristics v s = +5 v, t amb = +25 c; reference point pin 4 (9, 16), unless otherwise specified parameters test conditions / pins symbol min. typ. max. unit dc-supply pin 23 supply voltage sdip28 so28 v s v s 4.5 4.5 5.0 5.0 9.0 5.5 v v supply current i s 85 93 ma vif-input pin 6-7 input sensitivity, (rms value) for fpll locked v in 80 120 v rms input impedance see note 1 r in 1.2 k input capacitance see note 1 c in 2 pf vif-agc pins 8 and 15 if gain control range g v 60 65 db agc capacitor pin 8 c agc 2.2 f black level capacitor pin 15 c bl 100 nf switching voltage: vcr mode see note 2 v sw 4.0 v switching current: vcr mode see note 2 i sw 50 a tuner-agc pins 10 and 11 see note 3 available tuner-agc current i tun 1 2 4 ma allowable output voltage v 11 0.3 13.5 v if slip tuner agc current i tun : 10 to 90% d g if 8 10 db if input signal for minimum take over point r top = 10 k (v top = 4.5 v) v in 4 mv if input signal for maximum take over point r top = 0, (v top = 0.8 v) v in 40 mv variation of the take over point by temperature d t amb = 55 c vif-agc: g v = 46 db d v in 2 3 db fpll and vco pins 18, 20, 21 and 26 see note 4 max. oscillator frequency for carrier generation f vco 70 mhz vision carrier capture range f vco = 38.9 mhz, c vco = 8.2 pf d f cap 1.5 2 mhz oscillator drift (free running) as function of temperature see note 5, dt amb = 55 c, c vco = 8.2 pf, f vco = 38.9 mhz d f/ d t 0.3 % video output pin 12 output current source sink i 12 2 5 3 ma ma output resistance see note 1 r out 100 video output signal peak-to-peak value v o , vid 1.8 2.0 2.2 vpp difference of the video signals between b/g and l d v o,vid 10 % sync. level v sync 1.2 v zero carrier level for neg. modulation, ultra white level v 13 = v s v 8 = 3 v v dc 3.4 v zero carrier level for pos. modulation, ultra black level v 13 = 0 v 8 = 3 v v dc 1.15 v supply voltage influence on the ultra white and ultra black level d v/ v 1 %/v video bandwidth (3 db) r l 1 k , c l 50 pf b 6 8 mhz
tda4470-d telefunken semiconductors rev. a1, 28-aug-96 preliminary information 8 (16) unit max. typ. min. symbol test conditions / pins parameters video frequency response over the agc range db 2.0 db differential gain error dg 2 5 % differential phase error dp 2 5 deg intermodulation 1.07 mhz see note 6 im 52 60 db video signal to noise ratio weighted, ccir-567 s/ n 56 60 db residual vision carrier fundamental wave 38.9 mhz and second harmonic 77.8 mhz v res1 2 10 mv lower limiting level below sync level d v lim1 400 mv upper limiting level above ultra white level d v lim 2 600 mv ripple rejection see note 1, pin 23/pin 12 rr 35 db standard switch pin 13 control voltage for mode 1: neg. modulated video-if signals and am/nicam sound see note 7 v sw 2.0 v s v control voltage for mode 2: pos. modulated video-if signals and am/l-nicam sound v sw 0 0.8 v switching current i sw 100 a afc output pin 22 control slope d i/ d f 0.7 a/khz frequency drift by temperature related to the picture carrier frequency 0.25 0.6 % output voltage upper limit lower limit v afc v s 0.4 0.4 v v output current i afc 0.2 ma afc switch pin 19 control voltage: afc aoffo afc curve rising afc curve falling see note 8 v sw 0 1.5 3.5 0.8 2.5 v s v v v switching current i sw 100 a l' switch pin 14 control voltage: l' frequency + l'-vco alignment l standard see note 9 v sw 0 3.4 3.0 v s v v switching current v sw = 0 i sw 700 a sif inputs pin 1-2, 27-28 input sensitivity (rms value) output signal at pin 24/25: 3 db v in 80 120 v rms input impedance see note 1 r in 1.2 k input capacitance see note 1 c in 2 pf sif-agc pin 5 if gain control range g v 60 65 db agc capacitor c agc 10 f intercarrier output-fm pin 24 see note 10 dc output voltage v dc 2 v
tda4470-d preliminary information telefunken semiconductors rev. a1, 28-aug-96 9 (16) unit max. typ. min. symbol test conditions / pins parameters output resistance see note 1 r out 150 sound if output voltage (5.5 mhz output voltage) v in = 10 mv v out 180 250 350 mv rms weighted signal to noise ratio: (ccir 468) ref. signal: v in = 10 mv; fm dev. = 27 khz f mod = 1 khz; tested with the double fm demod. u2860b; b/g modulated vif signal black screen: channel 1/2 grid pattern: channel 1/2 grey screen 50%: channel 1/2 s/n s/n s/n 60/58 54/52 60/57 db db db ripple rejection see note 1, pin 23/pin 24 rr 35 db af output-am pin 25 see note 11 dc output voltage v dc 2.2 v output resistance see note 1 r out 150 af output voltage v oaf 400 500 630 mv rms total harmonic distortion m = 54% f mod = 1 khz and 12.5 khz thd 1 2 % signal to noise ratio reference: m = 54 %, f mod = 1 khz, 22 khz low pass filter s/n 65 db ripple rejection see note 1, pin 23/pin 25 rr 28 db sif input selector switch pin 3 control voltage: input 1 active input 2 active see note 12 v sw 2.0 0 v s 0.8 v v switching current i sw 100 a notes 1.) this parameter is given as an application information and not tested during production. 2.) in vcr mode the vif- and sif path is switched off. 3.) adjustment of turn over point (delayed tuner agc) with external resistor r top or external voltage v top possible. 4.) resonance circuit of vco (f o = 38.9 mhz): c vco = 8.2 10 pf, coil l vco with unloaded q-factor q o 60 for an oscillator voltage 100 mv rms at pin 20 21 (e.g. toko coil 7 km, 292 xns - 4051z) 5.) the oscillator drift is related to the picture carrier frequency, at external temperature-compensated lc circuit. 6.) 1.07) = 20 log (4.43 mhz component/1.07 mhz component); (1.07) value related to black-white signal input signal conditions: picture carrier = 0 db, colour carrier = 6 db, sound carrier = 24 db 7.) without external control at pin 13 the ic automatically operates in mode 1: ? negative modulated video-if signals and fm/nicam sound signals. 8.) without control voltage at pin 19 falling afc curve is automatically selected. 9.) with open circuit at pin 14 the l' switch is not active. 10.) picture carrier pc = 38.9 mhz; sound carrier sc 1 = 33.4 mhz, sc 2 = 33.16 mhz; pc/sc 1 =13 db; pc/sc 2 = 20 db; pc unmodulated (equivalent to sync. peak level). 11.) sound carrier sc = 32.4 mhz, modulated with f mod = 1 khz, m = 54%; v in =10 mv 12.) without control voltage at pin 3 the sif input 1 is automatically selected.
tda4470-d telefunken semiconductors rev. a1, 28-aug-96 preliminary information 10 (16) 28 27 26 25 24 23 22 21 20 19 18 17 16 15 12 35 4 6789 10 11 12 13 14 8.2 pf l vco c vco loop filter 150 470 nf afc switch afc +v s intercarrier (fm/nicam) af (am) 10 k loop comp. sif 2 c ref 22 f black level 470 nf 10 k tuner delay tuner agc video video neg/pos agc (vif) vif agc (sif) sif input switch sif 1 l' 94 9291 tda4470d *) * ) external l/c circuit (vco 38.9 mhz) with toko coil 7km, 292 xns 4051z 2.2 f 10 f 22 k figure 3. test circuit
tda4470-d preliminary information telefunken semiconductors rev. a1, 28-aug-96 11 (16) 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 34 5 6 7 8 9 10 11 12 13 14 8.2 pf 10 nf 22 10 nf 51 k 51 k +5 v afc intercarrier (fm/nicam) 10 nf offset comp. 10 k loop filter 470 nf 150 c ref afc switch sif 2 sif 1 input switch s3 saw: am s2 bp: 33.4 mhz agc (sif) 10 k tuner agc l vco c vco saw: fm vif agc (vif) saw: vif tuner video +12 v 10 nf 10 nf 50 if in 1 2 3 4 8 7 6 5 u4744b tda4470d 94 8497 saw driver *) 10 2.2 bp: 32.4 mhz 2.2 k 3.3 nf af(am) 2 v c bl 100 nf s1 s4 l'adjust standard switch l/l' switch f f f *) external l/c circuit (vco: 38.9 mhz) with toko coil 7km, 292 xns 4051z 2.2 f figure 4. basic application circuit
tda4470-d telefunken semiconductors rev. a1, 28-aug-96 preliminary information 12 (16) internal pin configuration 1, 27 2, 28 2 k 2 k 20 k 3 v 94 8521 figure 5. sound if inputs (pin 1-2, 27-28) 3 10 k 60 k 94 8522 3.5 v figure 6. input selector switch (pin 3) 94 8523 5 figure 7. sif-agc time constant (pin 5) 94 8524 2 k 2 k 2.3 v 4.2 v figure 8. video if input (pin 6-7) 94 8525 8 figure 9. vif-agc time constant (pin 8) 6 k 6.5 k 94 8526 3.5 v figure 10. tuner agc take over point (pin 10)
tda4470-d preliminary information telefunken semiconductors rev. a1, 28-aug-96 13 (16) 94 8527 figure 11. tuner agc output (pin 11) 94 8528 2.6 ma figure 12. video output (pin 12) 15.5 k 17 k 94 8529 3.5 v 13 23 k figure 13. standard switch (pin 13) 94 8530 15 2.7 v 5 k figure 14. black level capacitor (pin 15) 94 8531 3.5 v figure 15. internal reference voltage (pin 17) 94 8532 2.75 v figure 16. loop filter (pin 18)
tda4470-d telefunken semiconductors rev. a1, 28-aug-96 preliminary information 14 (16) 10.5 k 30 k 94 8533 3.5 v 19 figure 17. afc switch (pin 19) 94 8534 7 k 7 k figure 18. vco (pin 20-21) 94 8535 figure 19. afc output (pin 22) 94 8536 1 ma 24 100 figure 20. intercarrier output (pin 24) 94 8537 25 100 1.4 ma figure 21. af output am sound (pin 25) 94 8538 10 k 10 k 3.5 v figure 22. vco offset compensation (pin 26)
tda4470-d preliminary information telefunken semiconductors rev. a1, 28-aug-96 15 (16) dimensions in mm package: sdip28 95 10610 95 10610 package: so28 95 9932
tda4470-d telefunken semiconductors rev. a1, 28-aug-96 preliminary information 16 (16) ozone depleting substances policy statement it is the policy of temic telefunken microelectronic gmbh to 1. meet all present and future national and international statutory requirements. 2. regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. it is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( odss). the montreal protocol ( 1987) and its london amendments ( 1990) intend to severely restrict the use of odss and forbid their use within the next ten years. various national and international initiatives are pressing for an earlier ban on these substances. temic telefunken microelectronic gmbh semiconductor division has been able to use its policy of continuous improvements to eliminate the use of odss listed in the following documents. 1. annex a, b and list of transitional substances of the montreal protocol and the london amendments respectively 2 . class i and ii ozone depleting substances in the clean air act amendments of 1990 by the environmental protection agency ( epa ) in the usa 3. council decision 88/540/eec and 91/690/eec annex a, b and c ( transitional substances ) respectively. temic can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. we reserve the right to make changes to improve technical design and may do so without further notice . parameters can vary in different applications. all operating parameters must be validated for each customer application by the customer. should the buyer use temic products for any unintended or unauthorized application, the buyer shall indemnify temic against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. temic telefunken microelectronic gmbh, p.o.b. 3535, d-74025 heilbronn, germany telephone: 49 ( 0 ) 7131 67 2831, fax number: 49 ( 0 ) 7131 67 2423

▲Up To Search▲

Price & Availability of TDA4470-DSD

	To Download TDA4470-DSD Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .