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features ? 5v supply voltage active carrier generation by fpll (frequency-phase-locked loop) principle for true synchronous demodulation vco circuit operates at picture ca rrier frequency, the vco frequency is switchable for l?-mode alignment-free afc without external reference circ uit, polarity of the afc curve is switchable vif-agc for negatively modulate d signals (peak synchronous detection) and for positive modu lation (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 contro lled (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) pb-free package, which is compliant with requirements of rohs benefits linear video demodulation good pulse response excellent intermodulation figures 1. description the tda4470 is an integrated bipolar circuit for multistandard video/sound if (vif/sif) signal processing in tv/vcr and multimedia applications. the circuit pro- cesses all tv video if signals with negative modulation (e.g., b/g standard), and the fm/nicam sound if signals. multistandard video-if and quasi parallel sound processing ic tda4470 rev. 4803c?tvvcr?10/05
2 4803c?tvvcr?10/05 tda4470 figure 1-1. 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 video det. control 19 afc switch
3 4803c?tvvcr?10/05 tda4470 2. circuit description 2.1 vision if amplifier the video if signal (vif) is fed through a saw filter to the differential input (pins 6-7) of the vif amplifier. this amplifier consists of three ac-coupled amplifier stages. each differential amplifier is gain controlled by the automatic gain control (vif-agc). the output signal of the vif amplifier is applied to the fpll carrier generation and the video demodulator. 2.2 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 con- stant level. therefore, the synchronous 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 the video signal controls the charge current. in order to reduce the 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 an interface circuit or microprocessor). 2.3 fpll, vco and afc the fpll (frequency-phase-locked loop) circuit consists of a frequency and phase detector to generate the control voltage for the vco tuning. in locked mode, the vco is controlled by the phase detector, in unlocked mode, the frequency detector is superimposed. the vco operates with an external resonance circuit (l and c in pa rallel) and is controlled by internal varicaps. the vco control voltage is also converted to a current and represents the afc output signal at pin 22. at the afc switch (pin 19) three operating conditions of the afc are possible: the afc curve ?rising? or ?fallin g? and afc ?off?. a practicable vco alignment of the external coil is the adjustment to zero afc output current at pin 22. at the center frequency, the afc output current is equal to zero. furthermore, at pin 14, the vco center frequency can be switched to se t it 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.
4 4803c?tvvcr?10/05 tda4470 2.4 video demodulation and amplifier the video if signal, which is applied from the gain-c ontrolled if amplifier, is multiplied with the in-phase 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 stan- dard dependent dc level shift in this stage delivers the same synchronous level for positive and negative modulation. an additional noise clipping is provided. the video signal is fed to the vif-agc and to the video output buffer. this amplifier with a gain of 6 db offers easy adoption of the sound trap. for a nominal video if modulation, the video output signal at pin 12 is 2 v pp . 2.5 sound if amplifier and sif-agc the sif amplifier is nearly identical with the 3-stage vif amplifier, except that the first amplifier stage exists twice and is switchable by a control voltage at pin 3. therefore, it is possible to switch between two different saw filters with mi nimal external expense. both sif inputs fea- tures 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 the am or fm carrier and controls the sif ampli- fier to provide a constant sif signal to the am demodulator and qps mixer. 2.6 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 out- put signal (pin 25) is switched off by the standard switch. 2.7 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 pro- vided from the vco. the intercarrier signal is fed via an output amplifier to pin 24. 2.8 standard switch to have equal polarity of the video output signal the polarity can be switched in the demodula- tion stage in accordance with the tv standard. additionally a standard dependent dc level shift in the video amplifier delivers the same sync. leve l. in parallel to this, the correct vif-agc is selected for positively or negatively modulated vif signals. in the case of negative modulation (e.g., b/g standard) the am output signal is switched off. for positive modulation (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. 2.9 l? switch with a control voltage at pin 14 the vco frequency can be switched in order to set 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 positively modulated video if-signals (standard switch in l mode).
5 4803c?tvvcr?10/05 tda4470 2.10 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 af c curve and to sw itch off the afc. 2.11 vcr mode for vcr mode in a tv set (external video source selected), it is recommended 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. 2.12 internal voltage stabilizer the internal bandgap reference ensures constant performance independent of supply voltage and temperature.
6 4803c?tvvcr?10/05 tda4470 3. pin configuration figure 3-1. pinning so28/sso28 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 vi,sif1 gnd cagc vsw vi,vif cagc gnd rtop itun vo,vid vsw vsw vi,sif2 rcomp vo,am vo,fm vs vafc vvco vsw cref gnd cbl lf vi,sif1 vi,vif vvco vi,sif2
7 4803c?tvvcr?10/05 tda4470 table 3-1. pin description pin symbol function 1, 2 vi,sf1 sif1 input (symmetrical) 3 vsw input selector switch 4, 9, 16 gnd ground 5 cagc sif-agc (time constant) 6, 7 vi,vif vif input (symmetrical) 8 cagc vif-agc (time constant) 10 rtop take-over point, tuner agc 11 itun tuner agc output current 12 vo,vid video output 13 vsw standard switch 14 vsw l? switch 15 cbl black level capacitor 17 cref internal reference voltage 18 lf loop filter 19 vsw afc switch 20, 21 vvco vco circuit 22 vafc afc output 23 vs supply voltage 24 vo,fm intercarrier output 25 vo,am af output - am sound 26 rcomp offset compensation 27, 28 vi,sif2 sif 2 input (symmetrical)
8 4803c?tvvcr?10/05 tda4470 4. absolute maximum ratings stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions beyond t hose indicated in the operational sections of this specification is not implied. exposure to absolute maximum rati ng conditions for extended periods may affect device reliability . reference point pin 4 (9, 16), unless otherwise specified parameters symbol value unit supply voltage, pin 23 so28 and sso28 package v s 6.0 v supply current, pin 23 i s 93 ma power dissipation so28 and sso28 package p 560 mw output currents, pins 12, 24 and 25 i out 5ma external voltages pins 1, 2, 5 to 8, 10, 12, 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 (1) , all pins v esd 300 v note: 1. equivalent to discharging a 200 pf capacitor through a 0 ? resistor. 5. thermal resistance parameters symbol value unit junction ambient, when soldered to pcb so28 package sso28 package r thja r thja 75 130 k/w k/w 6. operating range parameters symbol value unit supply voltage range, pin 23 so28 and sso28 package v s 4.5 to 6.0 v ambient temperature t amb ?10 to +85 c
9 4803c?tvvcr?10/05 tda4470 7. electrical characteristics v s = +5v, t amb = +25c; reference point pin 4 (9 , 16), unless otherwise specified. parameters test conditions pin symbol min. typ. max. unit dc-supply 23 supply voltage, so28, sso28 v s 4.5 5.0 5.5 v supply current i s 85 93 ma vif-input 6-7 input sensitivity (rms value) for fpll locked v in 80 120 v rms input impedance (1) r in 1.2 k ? input capacitance (1) c in 2pf vif-agc 8 and 15 if gain control range g v 60 65 db agc capacitor 8 c agc 2.2 f black level capacitor 15 c bl 100 nf switching voltage: vcr mode (2) v sw 4.0 v switching current: vcr mode (2) i sw 50 a tuner-agc 10 and 11 (3) available tuner-agc current i tun 124ma allowable output voltage v 11 0.3 13.5 v if slip - tuner agc current i tun : 10% to 90% ? g if 810db if input signal for minimum take-over point r top = 10 k ? (v top = 4.5v) v in 4mv if input signal for maximum take-over point r top = 0, (v top = 0.8v) v in 40 mv variation of the take-over point by temperature ? t amb = 55c vif-agc: g v = 46 db ? v in 23db notes: 1. this parameter is given as an application in formation and has not been tested during production. 2. in vcr mode, the vif- and sif path is switched off. 3. the adjustment of the turn over point (delay ed tuner agc) with the external resistor r top or external voltage v top is possible. 4. resonance circuit of vco (f o = 38.9 mhz): cvco = 8.2 - 10 pf, coil lvco 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 pi cture carrier frequency, given that the exte rnal lc circuit is temperature-compensat ed. 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 t he ic automatically operates in mode 1: ? negatively modulated video-if signals and fm/nicam sound signals. 8. without a control voltage at pin 19 the fa lling afc curve is automatically selected. 9. with an 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 synchronous peak level). 11. sound carrier sc = 32.4 mhz, modulated with f mod = 1 khz, m = 54%; v in =10 mv 12. without a control voltage at pin 3 the sif input 1 is automatically selected.
10 4803c?tvvcr?10/05 tda4470 fpll and vco 18, 20, 21 and 26 (4) maximum oscillator frequency for carrier generation f vco 70 mhz vision carrier capture range f vco = 38.9 mhz, c vco = 8.2 pf ? f cap 1.5 2 mhz oscillator drift (free running) as function of temperature (5) ? t amb = 55c, c vco = 8.2 pf, f vco = 38.9 mhz ? f/ ? t ?0.3 % video output 12 output current - source - sink i 12 2 5 3 ma ma output resistance (1) r out 100 ? video output signal peak-to-peak value v o,vid 1.8 2.0 2.2 v pp difference of the video signals between b/g and l ? v o,vid 10 % synchronous level v sync 1.2 v zero carrier level for negative modulation, ultra white level v 13 = v s v 8 = 3v v dc 3.4 v zero carrier level for positive modulation, ultra black level v 13 = 0 v 8 = 3v v dc 1.15 v supply voltage influence on the ultra white and ultra black level ? v/ v 1%/v video bandwidth (?3 db) r l 1 k ? , c l 50 pf b 6 8 mhz video frequency response over the agc range ? b2.0db differential gain error ? g25% 7. electrical characteristics (continued) v s = +5v, t amb = +25c; reference point pin 4 (9 , 16), unless otherwise specified. parameters test conditions pin symbol min. typ. max. unit notes: 1. this parameter is given as an application in formation and has not been tested during production. 2. in vcr mode, the vif- and sif path is switched off. 3. the adjustment of the turn over point (delay ed tuner agc) with the external resistor r top or external voltage v top is possible. 4. resonance circuit of vco (f o = 38.9 mhz): cvco = 8.2 - 10 pf, coil lvco 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 pi cture carrier frequency, given that the exte rnal lc circuit is temperature-compensat ed. 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 t he ic automatically operates in mode 1: ? negatively modulated video-if signals and fm/nicam sound signals. 8. without a control voltage at pin 19 the fa lling afc curve is automatically selected. 9. with an 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 synchronous peak level). 11. sound carrier sc = 32.4 mhz, modulated with f mod = 1 khz, m = 54%; v in =10 mv 12. without a control voltage at pin 3 the sif input 1 is automatically selected.
11 4803c?tvvcr?10/05 tda4470 differential phase error ? p 2 5 deg intermodulation 1.07 mhz (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 210mv lower limiting level below synchronous level ? v lim1 400 mv upper limiting level above ultra white level ? v lim2 600 mv ripple rejection pin 23/pin 12 (1) rr 35 db standard switch 13 control voltage for mode 1: negatively modulated video-if signals and am/nicam sound (7) v sw 2.0 v s v control voltage for mode 2: positively modulated video-if signals and am/l-nicam sound v sw 00.8v switching current i sw 100 a afc output 22 control slope ? i/ ? 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 7. electrical characteristics (continued) v s = +5v, t amb = +25c; reference point pin 4 (9 , 16), unless otherwise specified. parameters test conditions pin symbol min. typ. max. unit notes: 1. this parameter is given as an application in formation and has not been tested during production. 2. in vcr mode, the vif- and sif path is switched off. 3. the adjustment of the turn over point (delay ed tuner agc) with the external resistor r top or external voltage v top is possible. 4. resonance circuit of vco (f o = 38.9 mhz): cvco = 8.2 - 10 pf, coil lvco 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 pi cture carrier frequency, given that the exte rnal lc circuit is temperature-compensat ed. 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 t he ic automatically operates in mode 1: ? negatively modulated video-if signals and fm/nicam sound signals. 8. without a control voltage at pin 19 the fa lling afc curve is automatically selected. 9. with an 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 synchronous peak level). 11. sound carrier sc = 32.4 mhz, modulated with f mod = 1 khz, m = 54%; v in =10 mv 12. without a control voltage at pin 3 the sif input 1 is automatically selected.
12 4803c?tvvcr?10/05 tda4470 afc switch 19 control voltage: afc ?off? afc curve rising afc curve falling (8) v sw 0 1.5 3.5 0.8 2.5 v s v v v switching current i sw 100 a l? s w i t c h 1 4 control voltage: l? frequency + l?-vco alignment v sw 03.0v l standard (9) 3.4 v s v switching current v sw = 0 i sw 700 a sif inputs 1-2, 27-28 input sensitivity (rms value) output signal at pin 24/25: ?3 db v in 80 120 v rms input impedance (1) r in 1.2 k ? input capacitance (1) c in 2pf sif-agc 5 if gain control range g v 60 65 db agc capacitor c agc 10 f intercarrier output-fm 24 (10) dc output voltage v dc 2v output resistance (1) r out 150 ? sound if output voltage (5.5 mhz output voltage) v in = 10 mv v out 180 250 350 mv rms 7. electrical characteristics (continued) v s = +5v, t amb = +25c; reference point pin 4 (9 , 16), unless otherwise specified. parameters test conditions pin symbol min. typ. max. unit notes: 1. this parameter is given as an application in formation and has not been tested during production. 2. in vcr mode, the vif- and sif path is switched off. 3. the adjustment of the turn over point (delay ed tuner agc) with the external resistor r top or external voltage v top is possible. 4. resonance circuit of vco (f o = 38.9 mhz): cvco = 8.2 - 10 pf, coil lvco 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 pi cture carrier frequency, given that the exte rnal lc circuit is temperature-compensat ed. 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 t he ic automatically operates in mode 1: ? negatively modulated video-if signals and fm/nicam sound signals. 8. without a control voltage at pin 19 the fa lling afc curve is automatically selected. 9. with an 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 synchronous peak level). 11. sound carrier sc = 32.4 mhz, modulated with f mod = 1 khz, m = 54%; v in =10 mv 12. without a control voltage at pin 3 the sif input 1 is automatically selected.
13 4803c?tvvcr?10/05 tda4470 weighted signal-to-noise ratio: (ccir 468) reference signal: v in = 10 mv fm deviation = 27 khz f mod = 1 khz tested with the double fm demodulated 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 (1) 23, 24 rr 35 db af output-am 25 (11) dc output voltage v dc 2.2 v output resistance (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 pin 23/pin 25 (1) rr 28 db sif input selector switch 3 control voltage: - input 1 active - input 2 active (12) v sw 2.0 0 v s 0.8 v v switching current i sw 100 a 7. electrical characteristics (continued) v s = +5v, t amb = +25c; reference point pin 4 (9 , 16), unless otherwise specified. parameters test conditions pin symbol min. typ. max. unit notes: 1. this parameter is given as an application in formation and has not been tested during production. 2. in vcr mode, the vif- and sif path is switched off. 3. the adjustment of the turn over point (delay ed tuner agc) with the external resistor r top or external voltage v top is possible. 4. resonance circuit of vco (f o = 38.9 mhz): cvco = 8.2 - 10 pf, coil lvco 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 pi cture carrier frequency, given that the exte rnal lc circuit is temperature-compensat ed. 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 t he ic automatically operates in mode 1: ? negatively modulated video-if signals and fm/nicam sound signals. 8. without a control voltage at pin 19 the fa lling afc curve is automatically selected. 9. with an 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 synchronous peak level). 11. sound carrier sc = 32.4 mhz, modulated with f mod = 1 khz, m = 54%; v in =10 mv 12. without a control voltage at pin 3 the sif input 1 is automatically selected.
14 4803c?tvvcr?10/05 tda4470 figure 7-1. test circuit 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 5 4 6 78 9 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' (1) (1) external l/c circuit (vco 38.9 mhz) with toko coil 7km, 292 xns - 4051z 2.2 f 10 f 22 k
15 4803c?tvvcr?10/05 tda4470 figure 7-2. basic application circuit 2 8 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 1 9 1 8 1 7 1 6 1 5 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 8 . 2 p f 1 0 n f 2 2 f 1 0 n f 5 1 k ? + 5 v a f c i n t e r c a r r i e r ( f m / n i c a m ) 1 0 n f o f f s e t c o m p . 1 0 k ? l o o p f i l t e r 4 7 0 n f 1 5 0 ? c r e f a f c s w i t c h s i f 2 s i f 1 i n p u t s w i t c h s 3 s a w : a m s 2 b p : 3 3 . 4 m h z a g c ( s i f ) 1 0 k ? t u n e r a g c c v c o s a w : f m v i f a g c ( v i f ) s a w : v i f t u n e r v i d e o + 1 2 v 1 0 n f 1 0 n f 5 0 ? i f i n 1 2 3 4 8 7 6 5 u 4 7 4 4 b s a w d r i v e r ( 1 ) 1 0 f 2 . 2 f b p : 3 2 . 4 m h z 2 . 2 k ? 3 . 3 n f a f ( a m ) 2 v c b l 1 0 0 n f s 1 s 4 l ' a d j u s t s t a n d a r d s w i t c h l / l ' s w i t c h (1) external l/c circuit (vco: 38.9 mhz) with toko coil 7km, 292 xns - 4051z 2 . 2 f l v c o 5 1 k ?
16 4803c?tvvcr?10/05 tda4470 8. internal pin configuration figure 8-1. sound if inputs (pins 1-2, 27-28) figure 8-2. input selector switch (pin 3) figure 8-3. sif-agc time constant (pin 5) 1, 27 2, 28 2 k ? 20 k ? 3 v 2 k ? 3 10 k ? 3.5 v 60 k ? 5
17 4803c?tvvcr?10/05 tda4470 figure 8-4. video if input (pins 6-7) figure 8-5. vif-agc time constant (pin 8) figure 8-6. tuner agc - take-over point (pin 10) 2 k ? 2.3 v 4.2 v 2 k ? 8 6.5 k ? 3.5 v 6 k ?
18 4803c?tvvcr?10/05 tda4470 figure 8-7. tuner agc - output (pin 11) figure 8-8. video output (pin 12) figure 8-9. standard switch (pin 13) 2.6 ma 15.5 k ? 3.5 v 13 23 k ? 17 k ?
19 4803c?tvvcr?10/05 tda4470 figure 8-10. black level capacitor (pin 15) figure 8-11. internal reference voltage (pin 17) figure 8-12. loop filter (pin 18) 15 2.7 v 5 k ? 3.5 v 2.75 v
20 4803c?tvvcr?10/05 tda4470 figure 8-13. afc switch (pin 19) figure 8-14. vco (pins 20-21) figure 8-15. afc output (pin 22) 10.5 k ? 3.5 v 19 30 k ? 7 k ? 7 k ?
21 4803c?tvvcr?10/05 tda4470 figure 8-16. intercarrier output (pin 24) figure 8-17. af output am sound (pin 25) figure 8-18. vco offset compensation (pin 26) 1 ma 24 100 ? 25 100 ? 1.4 ma 10 k ? 3.5 v 10 k ?
22 4803c?tvvcr?10/05 tda4470 10. package information 9. ordering information extended type number package remarks standard package quantitiy TDA4470-MFLY so28, pb-free delivery in tubes 1,500 tda4470-mflg3y so28, pb-free delivery in taped form 2,000 tda4470-mfsy sso28, pb-free delivery in tubes 3,000 tda4470-mfsg3y sso28, pb-free delivery in taped form 4,000 technical drawings according to din specifications 0.25 0.10 package so28 dimensions in mm 0.4 1.27 16.51 18.05 17.80 2.35 7.5 7.3 9.15 8.65 10.50 10.20 0.25 28 15 114
23 4803c?tvvcr?10/05 tda4470 technical drawings according to din specifications package sso28 dimensions in mm 9.10 9.01 0.15 0.05 0.25 0.65 8.45 1.30 5.7 5.3 4.5 4.3 6.6 6.3 0.1 5 28 15 114
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