DATA Slillelet TDA3857 Quasi-split sound processor with two FM demodulators Product specification June 1994 Supersedes data of October 1990 File under Integrated Circuits, IC02 PHILIPS | MH 7110826 0078005 Te?Philips Semiconductors Product specification (rrr Quasi-split sound processor with two FM demodulators TDA3857 ee FEATURES QUICK REFERENCE DATA Quasi-split sound processor forall | SYMBOL PARAMETER MIN. | TYP. | MAX. | UNIT FM standards e. g. B/G , Reducing of spurious video signals Ve supply voltage (pin 19) 45 {5 88 |v by tracking function and AFC for Ip supply current - 60 |72 |mA the vision carrier reference circuit; VilF IF input sensitivity (~3 dB) - 70 100 | pV (recommendable for NICAM) Vo AF audio output signal (RMS value) =| 1 - V e Automatic muting of the AF2 signal THD fotal harmonic distortion = os To mm by the input level , ; , - e Stereo matrix correction S/N (W) | weighted signal-to-noise ratio - 68 - dB * Layout-compatible with TDA3856 (24 pins) and TDA3858 (32 pins). GENERAL DESCRIPTION ORDERING INFORMATION Symmetrical IF inputs. PA Gain controlled wideband IF EXTENDED CKAGE PIN amplifier. TYPE NUMBER AGC generation due to peak sync. PINS POSITION MATERIAL CODE Reference amplifier forthe TDA3857 20 DIL plastic SOT146 regeneration of the vision carrier. Optimized limiting amplifier for AM suppression in the regenerated vision carrier signal and 90 phase shifter. Intercarrier mixer for FM sound, output with low-pass filter. Separate signal processing for 5.5 and 5.74 MHz intercarriers. Wide supply voltage range, only 300 mW power dissipation at 5 V. June 1994 2 M@@ 7110426 0074600b Ib3Philips Semiconductors Product specification Quasi-split sound processor with two FM demodulators TDA3857 fo= 38.9 MHz ' 4 fo= 5.5 MHz to resonance o@ 5.5 MHz z Vp=5V reference a -{|H ae T circuit iow 5.74 <$ 14 a fo= 5.74 MHz =| T 19 12 7 (f10~[ 45 17 13 9 8 14 y 4 y 18 | VOLTAGE TRACKING . umiTine | pithy. 8 SUPPLY 3 AMPLIFIER] LATOR 8 g Fi A TDA3857 . AFI 7". FMIF2 |20 _ DRIVER > QUASI-SPLIT [ outputs Vive ' SoyND y_/| y to matrix > L DULATOR [Mute |> FMIF1 acm LIMITING he 6} Slage iF-amplifier AMPLIFIER AF2 AGC DEMODU - STEREO MATRIX . LATOR |e CORRECTION 4 2 16 {4 5 3 = L + L L fg= 5.74 MHz mye MEHO015 Fig.1 Block diagram (standard B/G). June 1994 3 @H 7110426 0078007 a&TT a A .......... tart; NePhilips Semiconductors Product specification Quasi-split sound processor with two FM demodulators TDA3857 PINNING SYMBOL | PIN DESCRIPTION MEHO16 FMIF1 1 IF difference input 1 for B/G standard (38.9 MHz) U Caac 2 |charge capacitor for AGC Fuirt [1] po] FMIF2 MATR 3 _|input for stereo matrix correction FM2R1 4 _|reference circuit for FM2 (5.74 MHz) ase 2 18] e FM2R2 5 [reference circuit for FM2 (5.74 MHz) MATR [3] 6) GND AF2 6 |AF2 output (AF out of 5.74 MHz) ruzrt [4] 77] Far AF1 7 {AF1 output (AF out of 5.5 MHz) FM1R1 8 reference circuit for FM1 (5.5 MHz) Far2 [5] 6] Cara FMiR2 9 _ [reference circuit for FM1 (5.5 MHz) veo fe] ASB Tico VC-R1 10 |reference circuit for the vision carrier (38.9 MHz) VO-R2 41. |reference circuit for the vision carrier (38.9 MHz) ari [7 4] Cart TRACK 12 {DC output level for tracking euirs [6] 3] Fa FMi1I 13 [intercarrier input for FMi (5.5 MHz) Cart 14 |DC decoupling capacitor for FM1 demodulator (AF1) Fuir2 (3 12] TRACK Ico 15 |intercarrier output signal (5.5/5.74 MHz) ve-r1 {10} 1] voR2 Cara 16 |DC decoupling capacitor for FM2 demodulator (AF2) FMa2l 17 _|intercarrier input for FM2 (5.74 MHz) . . GND 18 [ground (0 V) Fig.2 Pin configuration. Vp 19 j+5 to +8 V supply voltage FMIF2 20 | IF difference input 2 for B/G standard (38.9 MHz) June 1994 4 MH 71108eb 0074006 736 | OOOO errr rrr rrrPhilips Semiconductors Product specification Quasi-split sound processor with two FM demodulators TDA3857 FUNCTIONAL DESCRIPTION The quasi-split sound processor is suitable for all FM standards (e. g. B/G). B/G standard AGC detector uses peak sync level. Sound carrier SC1 (5.5 MHz) provides AF1, sound carrier SC2 (5.74 MHz) provides AF2. Muting With no sound carrier SC2 at pin 17, AF2 output is muted. The mute circuit prevents false signal recognition in the stereo decoder at high IF signal levels when no second sound carrier exists (mono) and an AF signal is present in the identification signal frequency range. With 1 mV at pin 17, under measurement conditions, AF2 is switched on (see limiting amplifier). Weak input signals at pins 1 and 20 generate noise at pin 17, which is present in the intercarrier signal and passes through the 5.74 MHz filter. Noise at pin 17 inhibits muting. No misinterpretation due to white noise occurs in the stereo decoder, when non-correlated noise masks the identification signal frequencies, which may be present in sustained tone signals. The stereo decoder remains switched to mono. June 1994 8 7110826 0078005 b?c i... saaaaaaaaaaaaaaaasaaaaacaaaaaaaaaaaaa aaa tates tac Sound carrier notch filter for an improved intercarrier buzz The series capacitor Cg in the 38.9 MHz resonant circuit provides a notch at the sound carrier frequency in order to provide more attenuation for the sound carrier in the vision carrier reference channel. The ratio of parallel/series capacitor depends on the ratio of VC/SC frequency and has to be adapted to other TV transmission standards if necessary, according to the formula Cs = Cp (fve/tsc)? - Cp. The result is an improved intercarrier buzz (up to 10 dB improvement in sound channel 2 with 250 kHz video modulation for BYG stereo) or suppression of 350 kHz video modulated beat frequency in the digitally-modulated NICAM subcarrier. Intercarrier buzz fine tuning with 250 kHz square wave video modulation The picture carrier for quadrature demodulation in the intercarrier mixer is not exactly 90 degrees due to the shift variation in the integrated phase shift network. The tuning of the LC reference circuit to provide optimal video suppression at the intercarrier output is not the same as that to provide optimal intercarrier buzz suppression. In order to optimize the AF signal performance, a fine tuning for the optimal S/N at the sound channel 2 (from 5.74 MHz) may be performed with a 250 kHz square wave video modulation. Measurements at the demodulators For all signal-to-noise measurements the generator must meet the following specifications: phase modulation errors < 0.5 for B/W-jumps intercarrier signal-to-noise ratio as measured with TV-demodulator AMF2 (weighted S/N) must be > 60 dB at 6 KHz sine wave modulation of the B/W-signal. Signal-to-noise ratios are measured with Af = +50 kHz deviation and fmod = 1 kHz; with a deviation of +80 KHz the S/N ratio is deteriorated by 4.5 dB.Philips Semiconductors Product specification Quasi-split sound processor with two FM demodulators TDA3857 LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL PARAMETER MIN. | MAX. | UNIT Vp supply voltage (pin 19) - 8.8 V 7 voitage (pins 1, 6, 7, 13, 15, 17 and 20) 0 Vp V Prot total power dissipation 0 635 |mWwW Tstg storage temperature -25 |+150 (C Tamb operating ambient temperature 0 +70 = |C VEsp electrostatic handling (note 1) all pins except pins 1 and 20 +500 |- Vv pins 1 and 20 +400 |- Vv -500 |- V Note to the Limiting Values 1. Equivalent to discharging a 200 pF capacitor through a 0 Q series resistor. June 1994 6 Me 7110826 0078010 394Philips Semiconductors Product specification Quasi-split sound processor with two FM demodulators TDA3857 CHARACTERISTICS Vp =5 V and Tamb = +25 C; measurements taken in Fig.3 with fyc = 38.9 MHz, fsc1 = 33.4 MHz and fgc2 = 33.158 MHz. Vision carrier (VC) modulated with different video signals, modulation depth 100% (proportional to 10% residual carrier). Vision carrier amplitude (RMS value) Vi vc = 10 mV; vision to sound carrier ratios are VC/SC1 = 13 dB and VC/SC2 = 20 dB. Sound carriers (SC1, SC2) modulated with f = 1 kHz and deviation Af = 50 kHz, unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. | TYP. | MAX. | UNIT Vp supply voltage (pin 19) 4.5 5 8.8 Vv Ip supply current (pin 19) 48 60 72 mA IF amplifier (pins 1 and 20) Ri input resistance 1.8 2.2 - kQ Ci input capacitance _ 2.0 2.6 pF Vi DC input voltage - 1.75 - V ViiF (RMS) | maximum input signal (RMS value, Vo = +1 dB 70 100 - mV pins 1-20) input signal sensitivity (RMS value) -3 dB intercarrier signal | 70 100 pV reduction at pin 15 AGy IF gain control 60 63 - dB V2 voltage for gain control (pin 2) 1.7 - 2.6 Vv B IF bandwidth 3 dB 50 70 - MHz Resonance amplifier (pins 10-11) Vo (p-p) vision carrier amplitude fo = 38.9 MHz - 270 - mV (peak-to-peak value) Rio-11 operating resistance - 4 - kQ L inductance Figs 3 and 4 - 0.247 j- nH Cc capacitance - 68 - pF Qu Q-factor of resonant circuit Qo = 90 - 40 - V0, 11 DC voltage (pins 10 and 11) - Ve-1 |- Vv Intercarrier mixer output (pin 15) Vo (AMS) output signal for 5.5 MHz (RMS value) 71 95 125 mV output signal for 5.74 MHz (RMS value) 32 43 56 mV B IF bandwidth -1 dB 6 8.5 - MHz -3 dB 7 10 - MHz Vvio/Vis | residual video AM on intercarrier note 1 - 3 10 % Vvc (RMS) | residual vision carrier (RMS value) 1st/2nd harmonic - 0.5 1 mV (38.9/77.8 MHz) Ris output resistance (emitter follower) 1 mA emitter current - 30 - Q lo allowable AC output current (pin 15) - - +0.7 mA hs allowable DC output current - ~ -2 mA Vis DC voltage LC-circuit atpin10,11 | 1.5 1.75 2.0 Vv adjusted to minimum video content at pin 15 4 June 1994 7 @@ 7110826 0078011 ecoPhilips Semiconductors Quasi-split sound processor with two FM demodulators Product specification TDA3857 SYMBOL | PARAMETER CONDITIONS _| MIN. | TYP. | MAX. | UNIT Limiting amplifiers (pins 13 and 17) Vi(RMS) minimum input signal (RMS value) 3 dB AF signal - 300 450 pV maximum input signal (RMS value) 200 - - mV Ri3, 17 input resistance 450 560 700 Q V13, 17 DC voltage - 0 - V Vi (RMS) level detector threshold for no muting only 5.74 MHz channel [0.8 1.2 1.7 mV (RMS value, pin 17) AVi hysteresis of level detector 4 7 12 dB FM1 and FM2 demodulators Measurements with FM IF input signals of 5.6 MHz and 5.74 MHz with Viir (ams) = 10 mV (fmod = 1 KHz, deviation Af = +50 kHz) at pins 13 and 17 without ceramic filters, Rs = 50.9. De-emphasis 50 ps. Q.-factor = 11 for resonant circuits at pins 4-5 and 8-9 (including IC). Vic(RMs) __|intercarrier signals - 100 - mV (RMS values, pins 4-5 and 8-9) Vv DC voltage (pins 4, 5, 8 and 9) - 1.8 - Vv Vo (RMS) AF output signals 0.84 0.95 1.07 V (RMS values, pins 6 and 7) AVo difference of AF signals between note 2 - - 1 dB channels (pins 6 and 7) Re,7 output resistance 75 100 130 Q V6.7 DC voltage 1.8 2.1 2.4 Vv le. 7(M) allowed AC current of emitter output note 3 - - $1.5 mA (peak value) l6,7 maximum allowed DC output current - - -2 mA THD total harmonic distortion - 0.5 1.0 % Vo (RMS) AF output signal (RMS value) THD = 1.5% 1.25 - - Vv QAM AM suppression 1 kHz;m=03 48 54 - dB S/N(W) weighted signal-to-noise ratio CCIR468-3 64 68 - dB B AF bandwidth (-3 dB) lower limit - - 20 Hz upper limit 100 - - kHz CCR crosstalk attenuation (pins 6-7) 60 70 - dB V3 adjustment voltage for AF2 note 4 minimum output signal |- 0 - Vv maximum output signal |- 5 - Vv AGarFamin {gain for minimum Vout V3 =0V -1.5 2.5 - dB AGaFamax | gain for maximum Vout Va=5V 1.0 1.5 - dB Vi14,16 DC voltage (pins 14 and 16) - 1.8 - Vv Tracking Automatic Frequency Control (AFC) of the vision carrier reference circuit Vo 12 tracking output voltage (pin 12) note 5 Vp -3.3/ Vp-1 IV Fta tracking reducing factor for black picture - 9 - white test picture - 4 - 50% grey picture - 6 - June 1994 8 MB 7110826 0078012 167Philips Semiconductors Product specification Quasi-split sound processor with two FM demodulators TDA3857 SYMBOL PARAMETER CONDITIONS MIN. | TYP. | MAX. | UNIT Ss AFC steepness (open loop) for black picture - -8 ~ mV/kKHz white test picture - -3 - mV/kHz 50% grey picture ~- -5.5 - mV/kKHz AF signal switches input signals: FM intercarrier into pin 13 see part FM demodulator no signal in pin 17 (AF2) the output signals are related to the signals described in the demodulator part. Vo/Vomute AF2 mute attenuation (pin 6) 70 - - dB dV6 DC jump at the AF2 output switching to Mute - 5 25 mV AF performance for FM operation (standard B/G) input signals: B/G IF input signal (pin 1, 20) unmodulated sound carriers different video modulation (100%) the output signals are related to the signals described in the demodulator part. (S+N)/N(W) | weighted signal-to-noise ratio CCIR468-3; de-emphasis 50 us black picture fi = 5.5 MHz 59 63 - dB 2T/20T pulses with white bar fi = 5.5 MHz 57 61 - dB 6 kHz sine wave, BAW-modulated fi = 5.5 MHz 52 56 - dB 250 kHz square wave, B/W-modulated fi = 5.5 MHz 50 54 - dB black picture fi = 5.742 MHz 57 61 - dB 2T/20T pulses with white bar fi = 5.742 MHz 55 59 ~ dB 6 kHz sine wave, BAV-modulated fi = 5.742 MHz 50 54 - dB 250 kHz square wave, B/W-modulated fi = 5.742 MHz 48 52 - dB Ripple rejection of the AF outputs RR ripple rejection VRip-p) = 200 mV; 30 40 - dB Vripple On Vp / Vripple On Vout fa = 70 Hz Notes to thec 1. Spurious intercarrier AM: m = (A B)/A haracteristics 2. AF signal can be adjusted by V3. 3. For larger current: RL > 2.2 kQ (pin 6 or 7 to GND) in order to increase the bias current of the output emitter follower. 4. lf not used, pin 3 should not be connected. 5. Automatic Frequency Control (AFC) of the vision carrier reference circuit (pins 10 and 11) for reducing spurious video signals in the stereo/dual sound modes. The factor of reducing F1r at a deviation Afvc specifies the ratio of spurious signals with/without tracking function. June 1994 Me 7110826 a a a 0076013 OT3 @ (A = signal at sync; B = signal with 100% picture modulation).Philips Semiconductors Product specification Quasi-split sound processor with two FM demodulators TDA3857 Vp=5V fps S74MHz = 5.5 MHz | 5600 5600 0.1 uF B/G-standard 22 UF iM i} ! tracki t_ tacking oe ; fel] 10 nF | 27 pF 2x BB 809! ' i | fey 20 19 18 17 16 15 14 ~= 13 3 Wi 68 ) F i | > TDA3857 = oamt~ Cp BH | oT L 470 470 _ 4.7 pF Q, = 40 fp = 38.9 MHz 7 MEHO017 f Fig.3 Test and application circuit for standard B/G (for application SAW-filters must be used). 4 1 Vy So a fo= 5.5 MHz Vp &=5.74MHz matrix AF2 AFi (1) Cp = 47 pF with optional use of correction (FM2) (FM1/AM) tracking (because of C, of the varicaps). MEHO12 106B (1) simple resonant circuit Cs = Cp (fvc/fsc) Cp Cs = 27 pF (see Fig.3) (2) resonant circuit with Cp = 68 pF 33.4 38.9 f (MHz) 2 MHz fo rH Fig.4 Frequency response of the 38.9 MHz reference circuit. June 1994 10 MB 7110826 0078014 TIT OO... eee rrrerrarrrrre_ errr rrr= Philips Semiconductors Product specification Quasi-split sound processor with two FM demodulators TDA3857 APPLICATION INFORMATION + 19 O+- + a 18 all inputs * protected voltage supply Inputs: 3.6V 1.8V 5kQ 1.1kQ ! ) 1.1kQ 20O4 ~ 7.5kQ 1 150Q 150Q IF input 10 TE 1.8V 30k 10 pF 13 of 17 560.Q limiter amplifier Reference circuits: + 50 pF 1OkQ reference | circuit 24V it | 1.8V 1OkKQ fy . Oy 5o0r8 L 50 pF 1st sound IF circuit 2nd sound IF circuit 2 o 14 MEHO13 Fig.5 Internal circuits (continued in Fig.6). June 1994 11 MB 7110626 0078015 17bPhilips Semiconductors Product specification Quasi-split sound processor with two FM demodulators TDA3857 Driver outputs and decouplings: + + + 75 kQ 1000 150.2 AF driver intercarrier 12 100Q 60r7 16 all inputs and outputs tracki protected 2mA 1 mA raenng Capacitor pins: * + 16kQ I 21V 2 14 0r 16 kQ AF 4 1 | MEHO19 Fig.6 Internal circuits (continued from Fig.5). June 1994 12 M@@ 7110826 0078016 402Philips Semiconductors Quasi-split sound processor with two FM demodulators Product specification TDA3857 --aAeee eee PACKAGE OUTLINE seating plane 26.92 26.54 | it | 32 42 360 | , OF 3.05 yooh oot i ~ 2.0 LL oleae 0.53 max Ey 0.254 | Dimensions in mm. Fig.7 20-lead dual in-line; plastic (SOT146). MSA268 June 1994 13 MH 71106e6 0076017 745 oy aaa sasaasasaaaaaaaaaaaaaaaaaaaaaaas sama maaanPhilips Semiconductors Product specification Quasi-split sound processor with two FM demodulators TDA3857 SOLDERING Plastic dual in-line packages BY DIP OR WAVE The maximum permissible temperature of the solder is 260 C; this temperature must not be in contact with the joint for more than 5 s. The total contact time of successive solder waves must not exceed s. The device may be mounted up to the seating plane, but the temperature of the plastic body must not exceed the specified storage maximum. If the printed-circuit board has been preheated, forced cooling may be necessary immediately after soldering to keep the temperature within the permissible limit. REPAIRING SOLDERED JOINTS Apply the soldering iron below the seating plane (or not more than 2 mm above it). If its temperature is below 300 C it must not be in contact for more than 10 s; if between 300 and 400 C, for not more than 5 s. June 1994 14 @ 7110826 0074016 645Philips Semiconductors Product specification Quasi-split sound processor with two FM demodulators TDA3857 DEFINITIONS Data sheet status Objective specification This data sheet contains target or goal specifications for product development. Preliminary specification | This data sheet contains preliminary data; supplementary data may be published later. Product specification This data sheet contains final product specifications. Limiting values Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of this specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information Where application information is given, it is advisory and does not form part of the specification. LIFE SUPPORT APPLICATIONS These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips for any damages resulting from such improper use or sale. June 1994 15 mm 9272NaPR AnzaAnia S11.