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INTEGRATED CIRCUITS
DATA SHEET
TDA8741; TDA8741H Satellite sound circuit with noise reduction
Product specification Supersedes data of November 1992 File under Integrated Circuits, IC02 October 1994
Philips Semiconductors
Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
FEATURES * Demodulation of main audio signal using wide band PLL (lock range selectable) * Demodulation of secondary audio signals using wide band PLL * Noise reduction of the secondary audio signals * Output selection: stereo, language 1, language 2, main audio and external * Mute control * Line outputs (SCART level). QUICK REFERENCE DATA SYMBOL Supply VP VIN3(rms) fOM supply voltage PARAMETER APPLICATIONS * Satellite receivers * TV sets * Video recorders.
TDA8741; TDA8741H
GENERAL DESCRIPTION The TDA8741; TDA8741H is a multi-function sound IC for use in satellite receivers, television sets and video recorders. The pin numbers given in parenthesis throughout this document refer to the QFP44 package.
CONDITIONS
MIN.
TYP.
MAX.
UNIT
8 S/N(A) = 40 dB - 5.5 10.0 -9 A-weighted 62
12
13.2
V
Main channel input sensitivity pin 18 (14) (RMS value) lock range PLL demodulator either or VOM S/N(A) output voltage pin 23 (19) signal-to-noise ratio - - -6 70 7.5 11.5 -4 - MHz MHz dBV dB 1.0 2.0 mV
Secondary channels VIN1,IN2(rms) input sensitivity pins 8 and 16 (3 and 11) (RMS value) S/N(A) = 40 dB - fOS1,2 VOR,OL S/N(A) Crosstalk S/M M/S S/S crosstalk from secondary to main channel crosstalk from main to secondary channel crosstalk between secondary channels - - - 74 74 74 - - - dB dB dB lock range PLL demodulators output voltage pins 24 and 25 (20 and 21) signal-to-noise ratio A-weighted 10.0 -8 72 0.8 - -6 80 1.5 11.5 -4 - mV MHz dBV dB
ORDERING INFORMATION TYPE NUMBER TDA8741 TDA8741H Note 1. When using IR reflow soldering it is recommended that the Drypack instructions in the "Quality Reference Handbook" (order number 9398 510 63011) are followed. October 1994 2 PACKAGE NAME SDIP42 QFP44(1) DESCRIPTION plastic shrink dual in-line package; 42 leads (600 mil) plastic quad flat package; 44 leads (lead length 1.3 mm); body 10 x 10 x 1.75 mm VERSION SOT270-1 SOT307-2
Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
BLOCK DIAGRAM
TDA8741; TDA8741H
The pin numbers in parenthesis refer to the QFP44 package.
Fig.1 Block diagram.
October 1994
3
Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
PINNING SYMBOL n.c. n.c. n.c. n.c. n.c. n.c. MCS IN-1 HFGND n.c. SCD n.c. MUTE n.c. Osel L IN-2 Osel R IN-3 VREF CD M CC M VP OM OR OL EXT/INT EXTR EXTL CATT/REC R RECTR CNR D R CD R CC R AFGND CC L CD L CNR D L RECTL CATT/REC L October 1994 PIN SDIP42 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 PIN QFP44 1 5 7 9 12 39 2 3 4 40 6 41 8 42 10 11 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 not connected not connected not connected not connected not connected not connected
TDA8741; TDA8741H
DESCRIPTION
main channel PLL lock-in range select/disable intercarrier input for secondary Channel 1 (left) ground for HF section not connected secondary channels PLLs disable not connected mute switch not connected output select switch bit 1 (left) intercarrier input for secondary Channel 2 (right) output select switch bit 2 (right) intercarrier input for main channel decoupling capacitor for reference voltage de-emphasis capacitor for main channel audio pass-through capacitor input for main channel positive supply voltage main channel output right channel output left channel output output switch bit 3 (external/internal) external audio input (right) external audio input (left) attack/recovery capacitor (right) rectifier DC decoupling (right) noise reduction de-emphasis capacitor (right) fixed de-emphasis capacitor (right) audio pass-through capacitor input for right channel ground for AF section audio pass-through capacitor input for left channel fixed de-emphasis capacitor (left) noise reduction de-emphasis capacitor (left) rectifier DC decoupling (left) attack/recovery capacitor (left) 4
Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
TDA8741; TDA8741H
SYMBOL CDC L CDC M CDC R n.c. n.c.
PIN SDIP42 40 41 42 - -
PIN QFP44 36 37 38 43 44
DESCRIPTION DC decoupling capacitor (left) DC decoupling capacitor (main) DC decoupling capacitor (right) not connected not connected
Fig.2 Pin configuration (SDIP42).
October 1994
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Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
TDA8741; TDA8741H
Fig.3 Pin configuration (QFP44).
October 1994
6
Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
FUNCTIONAL DESCRIPTION Satellite sound The baseband signal coming from a satellite tuner contains the demodulated video signal plus a number of sound carriers to facilitate reception of a PAL/NTSC/SECAM satellite signal. Nearest to the video signal is the main sound carrier which carries the single channel sound related to the video. This is an FM modulated carrier with a fixed pre-emphasis. The carrier frequency can be in the range of 5.8 to 6.8 MHz. Additionally, a number of optional secondary sound carriers may be present which can be used for stereo or multi-language sound related to the video, or for unrelated radio sound. These carriers are also FM modulated, but for better sound quality (improved signal-to-noise performance) broadcast satellites (e.g. `ASTRA') use a noise reduction system (adaptive pre-emphasis circuit, combined with a fixed pre-emphasis). These secondary carrier frequencies can be in the range of 6.30 to 8.28 MHz. For accurate tuning to the many sound carriers an external frequency synthesizer and mixer is used to transpose the sound carriers to intermediate frequencies of 10.7 and 10.52 MHz. The TDA8741; H contains all circuitry for processing the main channel and for two secondary channels, from IF signal to line (SCART) output drivers. The desired frequencies can be routed to the TDA8741; H via bandpass filters. Main channel (see Fig.1) The lock-in range of the main channel PLL can be switched between 5.5 to 7.5 MHz, PLL off and 10.0 to 11.5 MHz using the MCS signal at pin 7 (2) [when pin 7 (2) is at logic 0, being a voltage from 0 to 1.2 V, the lock-in range = 5.5 to 7.5 MHz; when pin 7 (2) is at logic 1, being a voltage from 3.5 V until VP, the lock-in range = 10.0 to 11.5 MHz; when pin 7 (2) is in the mid voltage position, being a voltage from 1.8 to 2.8 V, the main channel PLL is switched off]. The voltage is then determined by the resistor divider at this pin between VP and ground. If only one fixed carrier frequency for the main channel is to be demodulated (e.g. 6.5 MHz), the lock-in range of the PLL should be switched to 5.5 to 7.5 MHz. The baseband signal is applied to the main channel input, pin 18 (14) via a 6.5 MHz ceramic bandpass filter. Alternatively, if there is a requirement to demodulate different main channel frequencies, these frequencies can be transferred to a fixed intermediate frequency (e.g. 10.7 MHz) using an
TDA8741; TDA8741H
external mixer and oscillator-frequency synthesizer. In this event the lock-in range of the PLL should be switched to 10.0 to 11.5 MHz. The IF signal is applied to the main channel input, pin 18 (14) via a 10.7 MHz ceramic bandpass filter. The filtered signal is AC-coupled to a limiter/amplifier and then to a PLL demodulator. The PLL FM demodulator ensures that the demodulator is alignment-free. High gain and DC error signals from the PLL, which are superimposed on the demodulator output, require DC decoupling. A buffer amplifier is used to amplify the signal to the same level as the secondary channels and decouples DC using an electrolytic capacitor connected to pin 41 (37). The demodulator output signal is fed to pin 20 (16) via an internal resistor. The output signal can be de-emphasized by means of this resistor and an external capacitor connected to ground. Capacitor value = de-emphasis time constant per 1500 (for 50 s: 33 nF). From here the signal is fed to the output selectors. The signal is amplified to 500 mV (RMS) (i.e. -6 dBV) in the output amplifiers. Secondary channels An external mixer and oscillator frequency synthesizer transfers the secondary sound carriers to fixed intermediate frequencies e.g. 10.7 and 10.52 MHz. Two secondary channel inputs are available at pins 8 and 16 (3 and 11). The signals are routed to the inputs via external ceramic bandpass filters which are tuned to the required intermediate frequencies. For stereo applications the TDA8741; TDA8741H contains two identical secondary sound processing channels. Secondary Channel 1 will also be referred to as `LEFT' or `LANGUAGE 1' and secondary Channel 2 will also be referred to as `RIGHT' or `LANGUAGE 2'. From the inputs the signals are coupled to limiter/amplifiers and then to the PLL demodulators. Processing is similar to the main channel. The demodulator output signal is amplified in a buffer amplifier and DC decoupled using electrolytic capacitors connected to pins 40 (36) (left) and 42 (38) (right). The output level is set with a resistor connected in series with the capacitor. High frequency components in the amplified PLL output signal are filtered out in the audio LPF block (4th order Butterworth low-pass filter) to prevent unwanted influence on the noise reduction.
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Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
NOISE REDUCTION (NR) The noise reduction can be regarded as an input level-dependent low-pass filter (adaptive de-emphasis system) followed by a fixed de-emphasis. With maximum input level (0 dB) the frequency response of the first part (i.e. without the fixed de-emphasis) is virtually flat. As the input level is lowered by x-dB, the higher output frequencies will be reduced an extra x-dB with respect to the lower frequencies (1 : 2 expansion). The NR output signal is fed to pin 36 (32) (left) and pin 32 (28) (right) via an internal resistor. Fixed de-emphasis is achieved by these resistors and external capacitors connected to ground. The signals are DC decoupled via pins 36/35 (32/31) and 32/33 (28/29) and then routed to the output selectors. OUTPUT SELECTION With the output selector (see Table 1) the outputs at pins 25 and 24 (21 and 20) can be switched to the different channels. Both outputs can be switched to both secondary channels, to the main channel and to the external inputs at pin 28 and 27 (24 and 23) for IC chaining purposes. Pin 23 (19) is a separate output which delivers the main channel only, thereby creating the possibility of having three different output channels simultaneously e.g. for use in hi-fi VCRs. The outputs at pins 25 and 24 (21 and 20) can be muted by setting the MUTE signal at pin 13 (8) to logic 1 (switch positions 6 and 7). The output at pin 23 (19) can be muted by setting the MUTE signal and the EXT/INT signal at pin 26 (22) both logic 1 (switch position 7). All outputs at pins 23, 24 and 25 (19, 20 and 21) are line drivers with SCART level capability and are short-circuit protected by 125 output resistors. Output level of all channels = -6 dBV typical when frequency deviation of FM signal is 54% of maximum frequency deviation (i.e. 0.54 x 85 kHz = 46 kHz for the main channel and 0.54 x 50 kHz = 27 kHz for the secondary channels) at 1 kHz modulation frequency (reference level). ABBREVIATIONS
TDA8741; TDA8741H
fMOD = modulating frequency. fM = frequency deviation of the main Channel. fS1 = frequency deviation of secondary Channel 1 (left). fS2 = frequency deviation of secondary Channel 2 (right). fOM = carrier frequency of main Channel. fOS1 = carrier frequency of secondary Channel 1. fOS2 = carrier frequency of secondary Channel 2. LPF = Low-Pass Filter. NR = Noise Reduction. PLL = Phase-Locked-Loop.
October 1994
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Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL VP VI Vn PARAMETER supply voltage input voltage level on pins 8 and 16 (3 and 11) CONDITIONS note 1 note 2 0 0 0
TDA8741; TDA8741H
MIN. 1 9
MAX. 13.2 V V V
UNIT
voltage on pins 11, 13, 15, 17, 20, 21, note 2 23 to 26, 31, 33, 35, 37, 40, 41, and 42 (6, 8, 10, 13, 16, 17, 19, 20 to 22, 27, 29, 31, 33, 36, 37 and 38) voltage on pins 7, 18, 19, 27 to 30, 32, 36, 38 and 39 (2, 14, 15, 23 to 26, 28, 32, 34 and 35) storage temperature operating ambient temperature note 1
Vn
0
VP
V
Tstg Tamb Notes
-55 -20
+150 +70
C C
1. All voltages referenced to ground pins 9 and 34 (4 and 30). 2. All voltages referenced to ground pins 9 and 34 (4 and 30). These voltages must not exceed VP or maximum value at any time. THERMAL CHARACTERISTICS SYMBOL Rth j-a SDIP42 QFP44 PARAMETER thermal resistance from junction to ambient in free air 53 69 K/W K/W VALUE UNIT
DC CHARACTERISTICS All voltages referenced to ground at pins 9 and 34 (4 and 30). Measured in test circuit Fig.4; VP = 12 V; Tamb = 25 C; fM = fS1 = fS2 = 0 kHz (no modulation); fOM = 6.5 MHz; fOS1 = 10.7 MHz; fOS2 = 10.52 MHz; HF level at pin 18 (14): 40 mV (RMS); HF level at pins 8 and 16 (3 and 11): 20 mV (RMS); MCS = logic 0 [V7 (V2) = 0 V]; SCD = logic 0 [V11 (V6) = 0 V]; unless otherwise specified. SYMBOL VP IP Ptot Vn VREF VIN1,IN2 VCDCL,CDCR VCDCM IIN3 supply voltage supply current total power dissipation voltage on pins 20, 21, 23, 24, 25, 27, 28, 30, 32, 33, 35, 36 and 38 (16, 17, 19, 20, 21, 23, 24, 26, 28, 29, 31, 32 and 34) input reference voltage on pin 19 (15) voltage on pins 8 and 16 (3 and 11) voltage on pins 40 and 42 (36 and 38) voltage on pin 41 (37) input current at pin 18 (14) PARAMETER - - - 3.7 - - - - MIN. 8.0 TYP. 12 38 - 3.8 3.8 0 3.0 2.8 - MAX. 13.2 45 600 - 3.9 - - - 1 V mA mW V V V V V A UNIT
October 1994
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Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
TDA8741; TDA8741H
AC CHARACTERISTICS All voltages referenced to ground at pins 9 and 34 (4 and 30). Measured in test circuit Fig.4; VP = 12 V; Tamb = 25 C; fMOD = 1 kHz; fOM = 6.5 MHz; fM = 46 kHz; fS1 = fS2 = 27 kHz (reference levels); fOS1 = 10.7 MHz; fOS2 = 10.52 MHz; HF level at pin 18 (14): 40 mV (RMS); HF level at pins 8 and 16 (3 and 11): 20 mV (RMS); MCS = logic 0 [V7 (V2) = 0 V]; SCD = logic 0 [V11 (V6) = 0 V]; unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN. - - - - MCS = logic 1 fOM RCDM VCDM VCDM RCCM lock range of PLL output resistance for 50 s de-emphasis pin 20 (16) output voltage pin 20 (16) spread of PLL output voltage over lock range pin 20 (16) input resistance of output amplifier pin 21 (17) note 1 MCS = logic 1; note 1 - 5.5 10.0 1.24 TYP. MAX. UNIT
Main channel - HF input pin 18 (14) and limiter VIN3(rms) VIN3(rms) RIN3 fCCO input sensitivity (RMS value) input signal level (RMS value) input resistance S/N(A) = 40 dB 1.0 - 15 2.0 200 - - - 7.5 11.5 1.7 mV mV k
Main channel - PLL FM demodulator and DC decoupling amplifier free-running frequency 6.5 10.7 - - 1.5 MHz MHz MHz MHz k
-18.5 -16.0 -14.5 dBV - 95 - 150 1 200 dB k
Main channel - overall performance (output selector in position 4) VOM,OR,OL THD S/N(A) V OM ( 15 kHz ) -----------------------------V OM ( 1 kHz ) ROM,OR,OL S/M MUTEatt SVRR output voltage pins 23, 24 and 25 (19, 20 and 21) total harmonic distortion signal-to-noise ratio all PLLs locked all PLLs locked A-weighted; all PLLs locked -9 - 62 -0.5 -6 0.1 70 0 -4 0.5 - +0.5 dBV % dB dB
15 kHz frequency response no de-emphasis with respect to 1 kHz pin 23 (19) connected output resistance pins 23, 24 and 25 (19, 20 and 21) crosstalk attenuation from secondary channels to main mute attenuation supply voltage ripple rejection note 2 output selector in position 7
92 - 74
125 74 - 35
150 - - -
dB dB dB
VRR = 100 mV; fi = 70 Hz - S/N(A) = 40 dB - - 280
Secondary channels 1 and 2 - HF inputs pins 8 and 16 (3 and 11) and limiters VIN1,IN2(rms) Vi(rms) RIN1,IN2 input sensitivity (RMS value) input signal level (RMS value) input resistance 0.8 - 330 1.5 200 380 mV mV
October 1994
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Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
TDA8741; TDA8741H
SYMBOL
PARAMETER
CONDITIONS
MIN. - -
TYP.
MAX. - 11.5 2.2 - 1
UNIT
Secondary channels 1 and 2 - PLL FM demodulators fCCO1 fCCO2 fOS1/2 RS1,S2 VCDCL,CDCR(rms) VCDCL,CDCR free running frequency PLL1 free running frequency PLL2 lock range of PLLs series resistance for optimum frequency response adjustment PLL output voltage pins 40 and 42 (36 and 38) (RMS value) spread of PLL output voltage over lock range output resistance for 75 s de-emphasis pins 36 and 32 (32 and 28) input resistance of output amplifiers pins 35 and 33 (31 and 29) output voltage level pins 25 and 24 (21 and 20) unbalance voltage outputs pins 25 and 24 (21 and 20) total harmonic distortion signal-to-noise ratio note 4 note 4 note 4 A-weighted; note 4 note 3 10.7 - 0.68 9 - MHz MHz MHz k mV dB 10.52 -
10 0
pins to be left open-circuit - -
Secondary channels - overall performance of LPF and NR (output selectors in position 1) RO 1.9 2.3 2.6 k
Ri
95
150
200
k
VOL,OR UBS THD S/N(A) Ro MUTEatt S/S M/S Voffset(DC)
-8 -1 - 72 92 74 - - 14
-6 - 0.1 80 125 - 74 74 16
-4 +1 0.5 - 150 - - - 20
dBV dB % dB dB dB dB mV
output resistance pins 25 and 24 note 4 (21 and 20) mute attenuation crosstalk attenuation between secondary channels crosstalk attenuation from main channel to secondary DC offset voltage on attack/recovery capacitors pins 29, 39 (25, 35) supply voltage ripple rejection output selector in position 6; note 4 note 5 note 6 all PLLs locked; f = 0
SVRR
VRR = 100 mV; fi = 70 Hz note 7
- -25
25 -16
- -9
dB
Secondary channels - low-pass filter pins 38 and 30 (34 and 26) V RECTL, RECTR ( 50 kHz ) ---------------------------------------------------------V RECTL, RECTR ( 1 kHz ) 50 kHz frequency response with respect to 1 kHz dB
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Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
TDA8741; TDA8741H
SYMBOL
PARAMETER
CONDITIONS fS1 = fS2 = 50 kHz; no fixed de-emphasis connected fS1 = fS2 = 50 kHz; no fixed de-emphasis connected fS1 = fS2 = 5 kHz; no fixed de-emphasis connected fS1 = fS2 = 5 kHz; no fixed de-emphasis connected
MIN. -1
TYP.
MAX.
UNIT
Secondary channels - noise reduction pins 25 and 24 (21 and 20); note 4 VOL,OR output voltage at 0 dB noise reduction input level 15 kHz frequency response with respect to 1 kHz at 0 dB noise reduction input level output voltage at -20 dB noise reduction input level 15 kHz frequency response with respect to 1 kHz at -20 dB noise reduction input level +1 +3 dBV
V OL, OR ( 15 kHz ) --------------------------------------V OL, OR ( 1 kHz ) VOL, OR
-2
0
+2
dB
-29
-26
-23
dBV
V OL, OR ( 15 kHz ) --------------------------------------V OL, OR ( 1 kHz )
-13
-11.5 -10
dB
External inputs - pin 28 (24) (left) and pin 27 (23) (right) - overall performance (output selector in position 5) VEXTR,EXTL Ri VOL,OR THD S/N(A) L/R,R/L VIL VIH Ri input signal level input resistance output level total harmonic distortion signal-to-noise ratio crosstalk VEXTR, EXTL = -6 dBV VEXTR, EXTL = -6 dBV; fi = 1 kHz A-weighted; VEXTR, EXTL = -6 dBV fi = 1 kHz - 95 -6.5 - 80 - - 150 -6.0 - - 80 - - 100 6 200 -5.5 0.1 - - dBV k dBV % dB dB
Secondary channels PLLs disable [SCD pin 11 (6)]; pin 11 (6) left open-circuit = logic HIGH LOW level input voltage HIGH level input voltage input resistance connected to VP 0 3.5 65 1.2 9 130 V V k
Output selector control circuit (see also Table 1) and main channel PLL lock-in select [MCS pin 7 (2)]; pins 15, 17, 26, 13 and 7 (10, 13, 22, 8 and 2) MOS inputs and should not be left open-circuit VIL VIM VIMF VIH RIL RIH IIL IIH LOW level input voltage limits MID level input voltage limits for MCS pin only MID level input voltage on MCS pin if MCS pin is floating HIGH level input voltage limits low input resistance MCS pin to ground high input resistance MCS pin to VP LOW level input current (not MCS pin) HIGH level input current (not MCS pin) VIL = 0 V VIH = 5 V VP must be 1.8 to 13.2 V 0 1.8 17 3.5 12 52 - - - - 19 - 19 80 <-1 <1 1.2 2.8 21 VP 26 108 - - V V %VP V k k A A
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Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
Notes to the AC characteristics
TDA8741; TDA8741H
1. At pin 20 (16) the demodulated 1 kHz signal should be present with a typical level of 158 mV (RMS) (-16 dBV), and THD of maximum 0.5%; VP = 8 to 13.2 V; Tamb = -20 to +70 C. 2. Modulation of main channel is OFF; modulation of secondary channels is ON. 3. The electrolytic capacitors at pins 40 and 42 (36 and 38) are removed and 1500 pF capacitors between pin 40 (36) and ground and between pin 42 (38) and ground are connected. At pins 40 and 42 (36 and 38) the demodulated 1 kHz signals should be present with typical levels of 9 mV (RMS) and THD of maximum 0.5%; VP = 8 to 3.2 V; Tamb = -20 to +70 C. 4. All PLLs locked; RS1 = RS2 = 0.68 k. 5. Modulation of secondary channel being measured and main channel is OFF; modulation of other secondary channel is ON. 6. Modulation of main channel is ON; modulation of secondary channels is OFF. 7. Measured at pins 38 (34) (left) and 30 (26) (right) and no electrolytic capacitors connected to these pins. Table 1 Truth table for output selection (note 1) PIN 15 (10) STATE OUTSEL L stereo left right main external mute secondary mute all 1 1 0 0 X X X OUTSEL R 1 0 1 0 X X X EXT/INT 0 0 0 0 1 0 1 MUTE 0 0 0 0 0 1 1 PIN 17 (13) PIN 26 (22) PIN 13 (8)
SWITCH POSITION 1 2 3 4 5 6 7 Note 1. X = don't care.
October 1994
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Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
TDA8741; TDA8741H
October 1994
14
The pin numbers in parenthesis refer to the QFP44 package.
Fig.4 Test circuit.
Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
APPLICATION INFORMATION General The satellite baseband signal is routed to a mixer to transfer the various secondary channels to fixed intermediate frequencies of 10.7 and 10.52 MHz. Tuning to the required carrier frequencies can be achieved by varying the oscillator frequency e.g. tuning to 7.02 and 7.20 MHz carrier frequencies requires an oscillator frequency of 17.72 MHz and tuning to 7.38 and 7.56 MHz requires an oscillator frequency of 18.08 MHz. The IF signals are routed to the inputs pin 8 and 16 (3 and 11) via 10.7 and 10.52 MHz ceramic bandpass filters. For the secondary channels the bandpass filter terminating resistor is integrated on-chip (330 typical) thus no external resistors are required. MCS pin 7 (2) = logic 0; (see Fig.5) The lock-in range of the main channel PLL is 5.5 to 7.5 MHz. For the main channel a ceramic bandpass filter (e.g. 6.5 MHz) is used to filter out the main sound carrier directly from the baseband signal. Simultaneous demodulation of one main channel and various secondary channels is now possible with a minimum of external components. As no bandpass filter terminating resistor for the main channel pin 18 (14) is integrated on-chip, an external resistor is required. MCS pin 7 (2) = logic 1; (see Fig.6) The lock-in range of the main channel PLL is now 10.0 to 11.5 MHz. The carrier frequency of the main channel is also transferred to a fixed intermediate frequency. In this event the main audio output level should be adjusted to -6 dBV by inserting a 470 resistor in series with the electrolytic capacitor on pin 41 (37). MCS pin 7 (2) = MID position The main channel PLL is off if the voltage is between 1.8 and 2.8 V on pin 7 (2). This situation can be obtained by a floating MCS pin if VP is between 10.8 and 13.2 V or by forcing this MCS pin to the desired voltage by an external voltage source. In that event VP can be in the full range of 8 to 13.2 V. This feature can be used to slightly improve the signal-to-noise ratio of the secondary channels if the main channel is not used.
TDA8741; TDA8741H
If simultaneous demodulation of main- and secondary sound carriers is not required, a low cost solution as given in Fig.6 can be considered. One mixer and frequency synthesizer are used to transfer all sound carriers to intermediate frequencies of 10.7 and 10.52 MHz. When the bandwidth of the main channel is larger than the secondary channel bandwidth, a separate (e.g. 10.7 MHz) ceramic filter plus resistors are required for the main channel. The secondary sound carriers can be demodulated as described above. If e.g. a 6.65 MHz main sound carrier is to be demodulated, this frequency is mixed to 10.7 MHz by tuning the frequency synthesizer to 17.35 MHz. If the synthesizer is tuned to 17.20 MHz a 6.5 MHz main sound carrier can be demodulated. When main sound is to be demodulated and this IF signal is also available on the secondary Channel 1 input the PLLs of the secondary channels can be disabled by making SCD pin 11 (6) HIGH. The output selector should be in position 4 (main sound on all outputs) if output pins 25 and 24 (21 and 20) are used. For high-end applications the input level of the NR can be adjusted to give optimum performance. 0 dB is the maximum input level which corresponds to the maximum frequency deviation of the incoming FM signal (50 kHz for secondary channels). If the NR input signal is too low (HIGH) the NR will attenuate (favour) the higher audio frequencies too much due to the expansion character. In general: 1 dB error in NR input level will give a 1 dB difference between low (50 Hz) and high (15 kHz) audio frequencies. With RS1 (RS2) the input level and so the frequency response of the NR can be adjusted: at 0 dB input level (which corresponds to a frequency deviation of 50 kHz) the output level of a 15 kHz modulated signal should be 0.25 dB lower than that of an 50 Hz modulated signal.
October 1994
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Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
TDA8741; TDA8741H
October 1994
16
The pin numbers in parenthesis refer to the QFP44 package.
Fig.5 Application diagram; MCS = logic 0.
Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
TDA8741; TDA8741H
October 1994
17
The pin numbers in parenthesis refer to the QFP44 package.
Fig.6 Application diagram; MCS = logic 1.
Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
PACKAGE OUTLINES
TDA8741; TDA8741H
handbook, full pagewidth
seating plane
39.0 38.4 4.57 5.08 max max
15.80 15.24
3.2 2.9
0.51 min 1.73 max 1.778 (40x) 1.3 max 0.53 max 0.18 M 0.32 max 15.24 17.15 15.90
42
22
MSA268 - 1
14.1 13.7
1
21
Dimensions in mm.
Fig.7 Plastic shrink dual in-line package; 42 leads (600 mil); SDIP42; SOT270-1.
October 1994
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Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
TDA8741; TDA8741H
handbook, full pagewidth
seating plane
0.1 S
S
12.9 12.3 44 1 34 33 1.2 (4x) 0.8 B
pin 1 index 0.8
11 12 0.40 0.20 10.1 9.9 22
23
0.40 0.20
0.15 M A
1.2 (4x) 0.8
0.15 M B
10.1 9.9
12.9 12.3
X
0.8
A
0.85 0.75 1.85 1.65 0.25 0.05 0.25 0.14 2.10 1.70
MBB944 - 2
detail X
0.95 0.55
0 to 10 o
Dimensions in mm.
Fig.8 Plastic quad flat package; 44 leads (lead length 1.3 mm); body 10 x 10 x 1.75 mm (QFP44; SOT307-2). October 1994 19
Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
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 5 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 pre-heated, 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. Plastic quad flat packages BY WAVE During placement and before soldering, the component must be fixed with a droplet of adhesive. After curing the adhesive, the component can be soldered. The adhesive can be applied by screen printing, pin transfer or syringe dispensing. Maximum permissible solder temperature is 260 C, and maximum duration of package immersion in solder bath is 10 s, if allowed to cool to less than 150 C within 6 s. Typical dwell time is 4 s at 250 C. A modified wave soldering technique is recommended using two solder waves (dual-wave), in which a turbulent wave with high upward pressure is followed by a smooth laminar wave. Using a mildly-activated flux eliminates the need for removal of corrosive residues in most applications.
TDA8741; TDA8741H
BY SOLDER PASTE REFLOW Reflow soldering requires the solder paste (a suspension of fine solder particles, flux and binding agent) to be applied to the substrate by screen printing, stencilling or pressure-syringe dispensing before device placement. Several techniques exist for reflowing; for example, thermal conduction by heated belt, infrared, and vapour-phase reflow. Dwell times vary between 50 and 300 s according to method. Typical reflow temperatures range from 215 to 250 C. Preheating is necessary to dry the paste and evaporate the binding agent. Preheating duration: 45 min at 45 C. REPAIRING SOLDERED JOINTS (BY HAND-HELD SOLDERING
IRON OR PULSE-HEATED SOLDER TOOL)
Fix the component by first soldering two, diagonally opposite, end pins. Apply the heating tool to the flat part of the pin only. Contact time must be limited to 10 s at up to 300 C. When using proper tools, all other pins can be soldered in one operation within 2 to 5 s at between 270 and 320 C. (Pulse-heated soldering is not recommended for SO packages.) For pulse-heated solder tool (resistance) soldering of VSO packages, solder is applied to the substrate by dipping or by an extra thick tin/lead plating before package placement.
October 1994
20
Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
DEFINITIONS Data sheet status Objective specification Preliminary specification Product specification Limiting values
TDA8741; TDA8741H
This data sheet contains target or goal specifications for product development. This data sheet contains preliminary data; supplementary data may be published later. This data sheet contains final product specifications.
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 the 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.
October 1994
21
Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
NOTES
TDA8741; TDA8741H
October 1994
22
Philips Semiconductors
Product specification
Satellite sound circuit with noise reduction
NOTES
TDA8741; TDA8741H
October 1994
23
Philips Semiconductors - a worldwide company
Argentina: IEROD, Av. Juramento 1992 - 14.b, (1428) BUENOS AIRES, Tel. (541)786 7633, Fax. (541)786 9367 Australia: 34 Waterloo Road, NORTH RYDE, NSW 2113, Tel. (02)805 4455, Fax. (02)805 4466 Austria: Triester Str. 64, A-1101 WIEN, P.O. Box 213, Tel. (01)60 101-1236, Fax. (01)60 101-1211 Belgium: Postbus 90050, 5600 PB EINDHOVEN, The Netherlands, Tel. (31)40 783 749, Fax. (31)40 788 399 Brazil: Rua do Rocio 220 - 5th floor, Suite 51, CEP: 04552-903-SAO PAULO-SP, Brazil. P.O. Box 7383 (01064-970). Tel. (011)821-2333, Fax. (011)829-1849 Canada: PHILIPS SEMICONDUCTORS/COMPONENTS: Tel. (800) 234-7381, Fax. (708) 296-8556 Chile: Av. Santa Maria 0760, SANTIAGO, Tel. (02)773 816, Fax. (02)777 6730 Colombia: IPRELENSO LTDA, Carrera 21 No. 56-17, 77621 BOGOTA, Tel. (571)249 7624/(571)217 4609, Fax. (571)217 4549 Denmark: Prags Boulevard 80, PB 1919, DK-2300 COPENHAGEN S, Tel. (032)88 2636, Fax. (031)57 1949 Finland: Sinikalliontie 3, FIN-02630 ESPOO, Tel. (9)0-50261, Fax. (9)0-520971 France: 4 Rue du Port-aux-Vins, BP317, 92156 SURESNES Cedex, Tel. (01)4099 6161, Fax. (01)4099 6427 Germany: P.O. Box 10 63 23, 20043 HAMBURG, Tel. (040)3296-0, Fax. (040)3296 213. Greece: No. 15, 25th March Street, GR 17778 TAVROS, Tel. (01)4894 339/4894 911, Fax. (01)4814 240 Hong Kong: PHILIPS HONG KONG Ltd., 6/F Philips Ind. Bldg., 24-28 Kung Yip St., KWAI CHUNG, N.T., Tel. (852)424 5121, Fax. (852)428 6729 India: Philips INDIA Ltd, Shivsagar Estate, A Block , Dr. Annie Besant Rd. Worli, Bombay 400 018 Tel. (022)4938 541, Fax. (022)4938 722 Indonesia: Philips House, Jalan H.R. Rasuna Said Kav. 3-4, P.O. Box 4252, JAKARTA 12950, Tel. (021)5201 122, Fax. (021)5205 189 Ireland: Newstead, Clonskeagh, DUBLIN 14, Tel. (01)640 000, Fax. (01)640 200 Italy: PHILIPS SEMICONDUCTORS S.r.l., Piazza IV Novembre 3, 20124 MILANO, Tel. (0039)2 6752 2531, Fax. (0039)2 6752 2557 Japan: Philips Bldg 13-37, Kohnan 2 -chome, Minato-ku, TOKYO 108, Tel. (03)3740 5028, Fax. (03)3740 0580 Korea: (Republic of) Philips House, 260-199 Itaewon-dong, Yongsan-ku, SEOUL, Tel. (02)794-5011, Fax. (02)798-8022 Malaysia: No. 76 Jalan Universiti, 46200 PETALING JAYA, SELANGOR, Tel. (03)750 5214, Fax. (03)757 4880 Mexico: 5900 Gateway East, Suite 200, EL PASO, TX 79905, Tel. 9-5(800)234-7381, Fax. (708)296-8556 Netherlands: Postbus 90050, 5600 PB EINDHOVEN, Bldg. VB Tel. (040)783749, Fax. (040)788399 New Zealand: 2 Wagener Place, C.P.O. Box 1041, AUCKLAND, Tel. (09)849-4160, Fax. (09)849-7811 Norway: Box 1, Manglerud 0612, OSLO, Tel. (022)74 8000, Fax. (022)74 8341 Pakistan: Philips Electrical Industries of Pakistan Ltd., Exchange Bldg. ST-2/A, Block 9, KDA Scheme 5, Clifton, KARACHI 75600, Tel. (021)587 4641-49, Fax. (021)577035/5874546. Philippines: PHILIPS SEMICONDUCTORS PHILIPPINES Inc, 106 Valero St. Salcedo Village, P.O. Box 2108 MCC, MAKATI, Metro MANILA, Tel. (02)810 0161, Fax. (02)817 3474 Portugal: PHILIPS PORTUGUESA, S.A., Rua dr. Antonio Loureiro Borges 5, Arquiparque - Miraflores, Apartado 300, 2795 LINDA-A-VELHA, Tel. (01)4163160/4163333, Fax. (01)4163174/4163366. Singapore: Lorong 1, Toa Payoh, SINGAPORE 1231, Tel. (65)350 2000, Fax. (65)251 6500 South Africa: S.A. PHILIPS Pty Ltd., 195-215 Main Road Martindale, 2092 JOHANNESBURG, P.O. Box 7430 Johannesburg 2000, Tel. (011)470-5911, Fax. (011)470-5494. Spain: Balmes 22, 08007 BARCELONA, Tel. (03)301 6312, Fax. (03)301 42 43 Sweden: Kottbygatan 7, Akalla. S-164 85 STOCKHOLM, Tel. (0)8-632 2000, Fax. (0)8-632 2745 Switzerland: Allmendstrasse 140, CH-8027 ZURICH, Tel. (01)488 2211, Fax. (01)481 77 30 Taiwan: PHILIPS TAIWAN Ltd., 23-30F, 66, Chung Hsiao West Road, Sec. 1. Taipeh, Taiwan ROC, P.O. Box 22978, TAIPEI 100, Tel. (02)388 7666, Fax. (02)382 4382. Thailand: PHILIPS ELECTRONICS (THAILAND) Ltd., 209/2 Sanpavuth-Bangna Road Prakanong, Bangkok 10260, THAILAND, Tel. (662)398-0141, Fax. (662)398-3319. Turkey: Talatpasa Cad. No. 5, 80640 GULTEPE/ISTANBUL, Tel. (0 212)279 2770, Fax. (0212)269 3094 United Kingdom: Philips Semiconductors LTD., 276 Bath road, Hayes, MIDDLESEX UB3 5BX, Tel. (081)73050000, Fax. (081)7548421 United States: 811 East Arques Avenue, SUNNYVALE, CA 94088-3409, Tel. (800)234-7381, Fax. (708)296-8556 Uruguay: Coronel Mora 433, MONTEVIDEO, Tel. (02)70-4044, Fax. (02)92 0601
For all other countries apply to: Philips Semiconductors, International Marketing and Sales, Building BE-p, P.O. Box 218, 5600 MD, EINDHOVEN, The Netherlands, Telex 35000 phtcnl, Fax. +31-40-724825 SCD35 (c) Philips Electronics N.V. 1994
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license under patent- or other industrial or intellectual property rights.
Printed in The Netherlands
533061/1500/02/pp24 Document order number: Date of release: October 1994 9397 740 50011
Philips Semiconductors

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