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TDA7335
STEREO PREAMP + AMS + DOLBY B* NOISE REDUCTION PROCESSOR
DUAL CHANNEL PROCESSOR FOR PLAYBACK APPLICATIONS. STEREO DOLBY B NR SYSTEM LOW NOISE HEAD PREAMPLIFIER MUTE, AUTOREVERSE, AMS (AUDIO MUSIC SENSOR) FUNCTIONS INTERNAL SWITCHES FOR EQUALIZATION DOLBY REFERENCE LEVEL -6dBm (388.2mVRMS) MINIMUM NUMBER OF EXTERNAL COMPONENTS LOW SUPPLY CURRENT (18mA) MIXED BIPOLAR/CMOS TECHNOLOGY DESCRIPTION The TDA7335 is a monolithic BICmos IC designed for use in stereo cassette player systems. The device includes two separate audio channels composed by low noise preamplifier, Dolby B noise reduction system and Audio Music Sensor. The dual preamplifier contains mute, autoreverse, metal/normal facilities for amplification of low level signal in applications requiring very low noise performances. Each channel consists of two cascaded operational amplifiers. The first one, AMP1, has a fixed gain of 36dB, low noise forward/reverse switchable input, and allows magnetic heads connection directly to ground. The second one, AMP2, is a standard operational amplifier whose equalizing external components fix the frequency response. The Audio Music Sensor circuit detects the interprogram space and then the starting point of musical programs (the interprogram time and program detection time are externally selectable). The device contains Dolby B decoder NR chains requiring very few external components and do not require coils. * Dolby B and the Double-D symbol are trademarks of Dolby Laboratories Licensing Corporation, San Francisco, California 94103-4813, USA. This device is available only to Licensing and application information may be obtained from Dolby Lab.
November 1999
SDIP30 ORDERING NUMBER: TDA7335
PIN CONNECTION (Top view)
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ABSOLUTE MAXIMUM RATINGS
Symbol VS Ptot Top Tstg Supply Voltage Total Power Dissipation Operating Temperature Range Storage Temperature Range Parameter Value 12 1 -40 to 85 -40 to 150 Unit V W C C
THERMAL DATA
Rth j-pins Thermal resistance junction-pins 85 C/W
PIN FUNCTIONS
N. 1 2,3 4,27 5, 26 6, 25 7, 24 8 9 10 11 12, 19 14 15 16 17 20 21 22 23 28, 29 30 Name GND IN L1, IN L2 EQLI, EQRI EQLO, EQRO OUTL, OUTR DINL, DINR AMS SW INTP INTS MUTE TLC, TCR Iref F/R SW VS Vref NR SW AMS GIN AMS OUT GND DIG. IN R1, IN R2 EQ SW 0 0 0 1.4 VS/2 0.4 Vref 1.2 5.6 0 4.6 4.6 4.6 Vref 5.6 VDC (V) Ground Preamplifier Left Inputs 1,2 Equalizer Inputs Equalizer Outputs Preamplifier Outputs Dolby NR Inputs Audio Music Sensor Switch (ON/OFF) HIGH = ON Interprogram Time Constant ("Signal Detection") Interspace Time Constant ("Blank Detection") Mute Switch ON = LOW (2) Dolby Time Constants Dolby Outputs Reference Current Source Forward/Reverse Switch HIGH = Forward LOW = Reverse Positive Power Supply Reference Voltage Noise reduction ON/OFF: HIGH = OFF (2) Audio Music Sensor Input Pin Audio Music Sensor Output Pin (open collector configuration, see Fig. 2) Digital Ground Preamplifier Right Inputs 1,2 Equalizer Switch (Low = normal position High = metal position) Function
13, 18 DOUTL, DOUTR
(2) Internal pull-up resistor (digital high level if pin left open)
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1K 6.8K GND R12 0.33F C6(*) C11 0.68F (*) TCR DOUTR 18 19 DINR AMSGin AMSout R8 10K 4.7F C13 R10 100K Vs OUTR 10nF C4 R5 300K R6 EQRO 15 RN 1.2K DOLBY 20 NRSW R13 100K AMP1 AMP2 0.68F C19 25 24 21 23 22 OUTR 26 RM F/R SW 0.68F C17 30K R2
1.2K
VS 0.22F C8
1F C2
TR2
EQRI 27
Figure 1: Application Circuit
36dB
INR2
28
INR1
29
17 AMS
VREF 4.7F C14 BIAS 16 1 14 IREF R11 43K 2% VS VS GND 0.22F C18
Vs GND
INPUT R
INL1 AMP1 AMP2
2
INL2
3
INPUT L
36dB
RM 4 OUTL DINL EQLI 300K R4 10nF C3 0.33F C5(*) R1 1.2K 30K Vs GND 0.68F C20 R14 6.8K R3 EQ SW AMSSW EQLO 5 30 6 7 8 9 INTP
RN
1.2K 10 INTS 12 TCL
DOLBY 13 DOUTL 11 MUTE
0.68F (*)
C10 R15 30K Vs GND 470K R7
TR1
C15 10nF
C7 0.1F
C9 1F
1F C1
1K
100K R9 VS OUTL
C12 4.7F
C16 100nF
D94AU095B
(*) Capacitor tolerance is 10%
TDA7335
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Figure 1a: Components& Top Copper Layer of the Fig. 1 (1:1 scale).
Figure 1b: Bottom Copper Layer of the Fig. 1 (1:1 scale).
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TEST CIRCUIT
1.8K OUTR 1F C2 300K C11 0.68F (*) TCR 19 18 DOUTR DINR EQRI 27 RM DOLBY 20 36dB 28 29 AMP1 AMP2 17 AMS 2 3 AMP1 AMP2 BIAS VREF NRSW GND RN 1.2K VS 26 15 25 24 21 23 22 R6 EQRO OUTR F/R SW AMSGin AMSout 0.33F C6(*) R8 10K 4.7F C13 R10 100K 10nF C4 R2 R5
6.8K
0.22F C8 VS
INPUT R
INR2
INR1
300pF
600 300pF
600
INPUT L
INL1
16 1 14
4.7F C14 VS GND
INL2
VS 0.22F C18 IREF
300pF
600 300pF 36dB
600
R11 43K DOLBY
RM 4 DINL EQ SW OUTL EQLI 300K R4 10nF C3 R1 1F C1 GND VS 1.8K 6.8K R3 0.33F C5(*) AMSSW EQLO 5 30 6 7 8
RN
1.2K 9 INTP 10 INTS 12 TCL
13 DOUTL
11 MUTE
0.68F (*)
C10
470K R7
C15 10nF
C7 0.1F
C9 1F
100K R9 VS
C12 4.7F
D94AU097A
(*) Capacitor tolerance is 10%
OUTL
TDA7335
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ELECTRICAL CHARACTERISTICS (VS = 8.5V; f = 1KHz; Rg = 600; Tamb = 25C; R11 = 43k; all level referenced to -6dBm/400Hz, at Dout with NR SW OFF; unless otherwise specified see application circuit of Fig. 1) NAB METAL position. SUPPLY
Symbol VS IS Vref VDC SVR MUTEth IMUTE MUTEA Parameter Supply Voltage Supply Current Reference Voltage (pin 17) DC Voltage pin 14 (R11 = 43K) Ripple Rejection (Input referred) Mute Threshold Pin11 Mute Current Mute Attenuation 55 Vripple = 0.3Vrms fripple = 1KHz ON OFF Dolby OFF Dolby ON Test Condition Min. 8 11 4 1.15 80 85 0 2.0 10 65 Typ. 8.5 18 4.3 1.25 90 95 0.8 VS 20 Max. 10.5 26 4.6 1.35 Unit V mA V V dB dB V V A dB
PREAMPLIFIER
Symbol RI II GV GV RM RM RN eN Parameter Input Resistance Input Bias Current Closed Loop Gain Closed Loop Gain Match Resistance Metal Position Metal Resistance Matching Resistance Normal Position Total Input Noise Unw. B = 20Hz to20KHz; Rg = 0 Rg = 600 A weighted; Rg =600 0.9 IN2 = ON; IN1 = OFF IN2 = OFF; IN1 = ON 0 2 0 3.5 pin 4, 5 and 26, 27 shorted 32.5 -1 4.35 -2 50 5.8 0 160 0.45 0.8 0.5 1.2 1.7 0.8 VS 1.5 VS 35.5 Test Condition (pin 2, 3, 28, 29) Min. 30 Typ. 50 Max. 70 10 38.5 1 7.25 2 300 Unit K A dB dB K dB V V V K V V V V
RO F/Rl F/Rh EQl EQh
Output Impedance (pin 6, 25) Reverse Low Level (pin 15) Forward High Level (pin 15) Normal Low Level (pin 30) Metal High Level (pin 30)
AUDIO MUSIC SENSOR
Symbol IAMSOUT VAMSOUT R P21 AMSswl AMSswh VTH1 VTH2 AMSth IAMSsw Parameter AMS Output Current AMS Output Low Level Input Impedance AMS OFF Low Level AMS ON High Level Interprogram Threshold Voltage Interspace Threshold Voltage AMS Threshold Level AMS Switch pin Current (pin 9) (pin 10) see note (3) IAMOUT = 2mA 0.8 0 2 1.2 4 0.6 5 1.45 4.3 1 10 200 1.1 Test Condition Min. Typ. Max. 5 800 1.4 0.8 VS 1.7 4.6 1.4 15 Unit mA mV K V V V V V A
DOLBY SECTION
Symbol GV GV RDI 6/20 Parameter Voltage Gain Gain Matching Dolby Input Res. (pin 7, 24) Test Condition f = 1KHz; DOLBY OFF OFF Min. -1 -0.5 46 63 Typ. 0 Max. 1 0.5 Unit dB dB K
TDA7335
ELECTRICAL CHARACTERISTICS (continued) DOLBY SECTION
Symbol RDO S/H B DEC 1 B DEC 2 B DEC 3 B DEC 4 B DEC 5 NRl NRh Parameter Dolby Output Impedance Signal Handling Decode Out Decode Out Decode Out Decode Out Decode Out Dolby ONLow Level Pin20 Dolby OFF High Level Pin 20 Test Condition (pin 13, 18) VS = 8V; THD = 1% f = 10KHz; VI = 0.4dB f = 500Hz; VI = -22.1dB f = 2KHz; VI = -18dB f = 5KHz; VI = -29.7dB f = 10KHz; VI = -29.6dB OFF ON ON ON ON ON DOLBY Min. 100 12 -1.5 -26.5 -26.5 -41.5 -41.5 0 2 Typ. 200 13 0 -25 -25 -40 -40 1.5 -23.5 -23.5 -38.5 -38.5 0.8 VS Max. 300 Unit dB dB dB dB dB dB V V
GENERAL (PREAMPLIFIER + DOLBY)
Symbol THD Parameter Total Harmonic Dist. Test Condition VO = 0dB; f = 1KHz Dolby OFF VO = 0dB; f = 1KHz Dolby ON VO = 0dB; f = 10KHz Dolby OFF VO = 0dB; f = 10KHz Dolby ON S/N Signal to Noise Ratio Rg = 600; VO = 0dB; Unweighted; Dolby OFF Rg = 600; VO = 0dB; Unweighted; Dolby ON Rg = 600; VO = 0dB; CCIR/ARM; Dolby OFF Rg = 600; VO = 0dB; CCIR/ARM; Dolby ON CS CT Channel Separation Channel Cross Talk Rg = 600; f = 1KHz Dolby OFF Rg = 600; f = 1KHz Dolby ON Rg = 600; f = 1KHz Dolby OFF Rg = 600; f = 1KHz Dolby ON 56 54 56 50 Min. Typ. 0.02 0.05 0.03 0.08 63 70 63 72 64 70 70 75 Max. 0.1 0.1 Unit % % % % dB dB dB dB dB dB dB dB
AUDIO MUSIC SENSOR (See Figure 2) Aim of this section is to detect interprogram spaces present on a recorded tape. Both the blanks (interprogram spaces) and the programs minimum detectable durations can be easily set by means of 2 external and independent time constants. Also the minimum detectable input signal level can be externally adjusted, by a dedicated gain network. Main blocks are: Variable gain limiter amplifier Signal detector circuitry Logic blocks able to avoid unproperoperations. Operations Description (refer to the simplified schematic of Figure 2). a)The two channels left and right mean signal coming from the preamp chain (AC coupled) are added (current) at the AMS input and pre-
sented to the limiter amplifier. The limiter amplifier gain is internally fixed to 40dB, and it could be reduced by the R8 external resistor. The AMSVth threshold is fixed at 1V. The following signal detector comparator informs of the presence of music signal (High level out) and avoids the erroneous detection of very low signal (like noise) as real program. b)The system moves in blank detection mode everytime the supply is turned on or, with power supplied, the AMS On/Off pin (to be driven by an open collector output) is turned off (T1 open). Once this condition has happened, the capacitor C15 charges, defining a minimum reset time, long enough to reset the Flip-Flops FF1 and FF2 and to descharge the program detector external C7 capacitor. The charging current at the AMS SW pin is about 10A. It follows that the reset time (C15 x Vpin8)/IC15 is given approximately by 0.122 x C15 ns where C15 is in F.
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c)From now on where the sum input signal (leftright) amplified by the limiter exceeds the signal detector threshold (3) the capacitor C7 is forced to charge. When the voltage across this capacitor reaches the comparator COMP1 threshold voltage Vth1 (approx. 2 Vbe) FF1 is set and FF2 is reset. (4) It follows that Q1 is turned on discharging the program detection capacitor (C7). d)Always when there is a recorded zone, Q1 is on; it becomes off only if a blank section is reached. When, with a time constant controlled by the R9, C9 network the voltage at space detection time pin reaches Vth2 threshold (comparator COMP2) a true blank section is detected and the FF2 is set. (The minimum charging time is approximately given by: 0.69 x C9 x R9 [sec] In this condition Q2 is ON, forcing the open collector AMS output to go LOW, informing the user that a true blank section has been detected. The state is then able to start from the above point c). Figures 3-4 show the signal behaviour. Figure 2: Audio Music Sensor The device is able to prevent false interspace detection and the end of the tape. (see Fig. 4). Note: (3): minimum RMS input signal is given by: Vin = AMSVth = 1K + R8 0.6 101K + R8
where Vin is the mean of left and right channels: Vin = Vright + Vleft 2
(4): the charging current at pin 9 is about 20A (half input signal) so program detection time constant is given by: C7 x 2Vbe = 70 x C7 [F] = [msec] 20A It is recommended to insert a resistor (R7) high enough to prevent fast C7 capacitor discharging.
AMS Gin RB 0.22F C8 IN-L
21
1K Rp21 Vs
100K R9 SIGNAL DETECT. COMPARATOR + COMP1 NOR1 Q1 Vth1 Q Q FF1 S R
9
INTP 0.1F C7 R7 500K
6
+
IN-R 25
+ LIMITER AMPLIFIER AMS th Vs
PROGRAM DETECTION TIME
Vth0
POWER-ON RESET AMS OUT 22 Q2 Q FF2 R Vth2 S COMP2 R9 Vs + 10 INTS C9 23
8 AMS SW
T2
D93AU098
C15
T1
SPACE DETECTION TIME
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Figure 3: AMS Timing Diagram
Figure 4
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ELECTRICAL COMPONENT DESCRIPTION (see figure 1)
COMPONENT P R E A M P TR1,TR2 C1, C2 C3, C4 R1, R2 R3, R5 R4, R6 C5, C6 R8 C8 RECOMMENDED VALUE 1K 1F 10nF 1.2K 6.8K 300K 0.33F 10% 10k 0.22F PURPOSE Left/Right Channel IN/OUT equalizer filter TR fixes the gain 150msec NORMAL 70sec METAL Preamplifier out to Dolby B input coupling capacitor Define the AMS input threshold level Vin 101K + R8 1.5 > 1V 1K + R8
A M S
where Vin = (Vright + Vleft)/2 R7 C7 R9 C9 C15 470K 0.1F 100K 1F 0.1F 0.68F 10% 4.7F 10% 4.7F 43K 0.1F 30K Set the interprogram detection time: INTP = 70 x 10-3 x C7[F] = [sec] Set the interspace detection time: INTS = 0.69 x C9 x R9 sec It fixes music search reset time; Tres = 0.122 x C15[F] = [sec] if C15 expressed in F Dolby output coupling capacitors Dolby time constants Reference voltage external capacitor It fixes the Iref current If fixes the mute time (typ 10msec).
D O L B Y
C10, C11 C12, C13 C14 R11 C16 R16
PINS DESCRIPTION: Internal Configuration Figure 5: PINS: 2 - 3 - 28 - 29 Figure 6: PINS: 7 - 24
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TDA7335
PINS DESCRIPTION: Internal Configuration Figure 7: PINS: 13 - 18 Figure 8: PIN: 9
Figure 9: PINS: 4 - 27
Figure 10: PINS: 5 - 26
Figure 11: PINS: 6 - 25
Figure 12: PINS: 8 - 15
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PINS DESCRIPTION: Internal Configuration Figure 13: PINS: 12 - 19 Figure 14: PIN: 14
Figure 15: PIN: 10
Figure 16: PIN: 22
Figure 17: PIN: 21
Figure 18: PIN: 30
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TDA7335
PINS DESCRIPTION: Internal Configuration Figure 19: PIN: 20 - 11 Figure 20: PIN: 17
DEVICE CHARACTERISTICS Figure 21: Quiescent Current vs. Supply Voltage Figure 22: Quiescent Current vs. Temperature
Figure 23: THD vs Supply Voltage
Figure 24: THD vs Frequency
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TDA7335
DEVICE CHARACTERISTICS (continued) Figure 25: THD vs. Output Signal Figure 26: THD + N vs. Frequency
Figure 27: Channel Separation vs. Frequency
Figure 28: Cross Talk vs. Frequency
Figure 29: Ripple Rejection vs. Frequency
Figure 30: Ripple Rejection vs. Frequency
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TDA7335
DEVICE CHARACTERISTICS (continued) Figure 31: Ripple Rejection vs. Frequency Figure 32: Mute Attenuation vs. Frequency
Figure 33: Mute Threshold
Figure 34: Vref. & Iref. vs. Vsupply
Figure 35: Vref. & Iref. vs. Temperature
Figure 36: D.C. Voltage pin 14 vs. Vsupply
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TDA7335
DEVICE CHARACTERISTICS (continued) Figure 37: Equalizer Threshold Figire 38: Forward/Reverse Threshold
Figure 39: Noise Reduction Threshold
Figure 40: Load Characteristcs
Figure 41: Signal Handling vs. Vsupply
Figure 42: Signal handling vs. Temperature
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TDA7335
DEVICE CHARACTERISTICS (continued) Figure 43: AMS Threshold vs. Frequency Figure 44: AMS Threshold vs. Rex
Figure 45: AMS Reset Time vs. Cex
Figure 46: AMS Interprogram vs. C7
Figure 47: Interprogram Charging Current
Figure 48: Interspace vs. C9
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DEVICE CHARACTERISTICS (continued) Figure 49: NAB Network Figure 50: Dolby-B Table
Normal Metal
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DIM. MIN. A A1 A2 B B1 C D E E1 e e1 L M S 0.31 2.54 0.51 3.05 0.36 0.76 0.20 27.43 10.16 8.38
mm TYP. MAX. 5.08 0.020 3.81 0.46 0.99 0.25 27.94 10.41 8.64 1.778 10.16 3.30 3.81 0.10 4.57 0.56 1.40 0.36 28.45 11.05 9.40 0.12 0.014 0.030 0.008 1.08 0.400 0.330 MIN.
inch TYP. MAX. 0.20
OUTLINE AND MECHANICAL DATA
0.15 0.018 0.039 0.01 1.10 0.410 0.340 0.070 0.400 0.13
0.18 0.022 0.055 0.014 1.12 0.435 0.370
0.15
0(min.), 15(max.) 0.012
SDIP30 (0.400")
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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics (c) 1999 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A. http://www.st.com
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