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TDA7336
STEREO PREAMP + AMS + DOLBY B* NOISE REDUCTION PROCESSOR
DUAL CHANNEL PROCESSOR FOR PLAYBACK APPLICATIONS. STEREO DOLBY B NR SYSTEM LOW NOISE HEAD PREAMPLIFIER MUTE, 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 TDA7336 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, 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, 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
SO28 ORDERING NUMBER: TDA7336
PIN CONNECTION (Top view)
GND INL EQLI EQLO OUTL DINL AMS SW INTP INTS MUTE TCL DOUTL IREF N.C.
1 2 3 4 5 6 7 8 9 10 11 12 13 14
D94AU052
28 27 26 25 24 23 22 21 20 19 18 17 16 15
EQ.SW INR EQRI EQRO OUTR DINR GND DIG AMSOUT AMSGin NR SW TCR DOUTR VREF Vs
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TDA7336
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 3,26 4, 25 5, 24 6, 23 7 8 9 10 11, 18 Name GND IN L EQLI, EQRI EQLO, EQRO OUTL, OUTR DINL, DINR AMS SW INTP INTS MUTE TLC, TCR 0.4 Vref 1.2 VS/2 1.4 0 0 0 VDC (V) 0 4.6 4.6 4.6 Vref 5.6 Ground Preamplifier Left Input 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 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 Input Equalizer Switch (Low = normal position High = metal position) Function
12, 17 DOUTL, DOUTR 13 Iref 15 16 19 20 21 22 27 28 VS Vref NR SW AMS GIN AMS OUT GND DIG. IN R EQ SW
(2) Internal pull-up resistor (digital high level if pin left open)
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1K Vs R10 100K 4.7F C13 0.68F(*) TCR DOUTR 19 NRSW 0.68F C19 17 OUTR 10nF C4 0.33F C6(*) R8 10K
1.2K
6.8K
0.22F C8
1F C2
TR2
R2
R5
300K EQRO DINR 23 20 22 21 18 24 RN 1.2K DOLBY OUTR AMSGin C11 AMSGout
EQRI 25 RM
R6
Figure 1: Application Circuit
26
R13 100K
36dB
INR AMP2 AMS AMP2
27
16
VREF 4.7F C14 15 Vs
Vs GND Vs
INPUT R
AMP1
INL
2
AMP1
BIAS 13 IREF
0.22F C18
INPUT L
36dB
1
GND
R11 43K
RM 4 6 7 DINL INTP INTS 8 9 28 5
RN 1.2K 11 TCL
DOLBY 12 DOUTL 10 MUTE 30K
3
EQ SW OUTL
EQLI
300K
EQLO
0.1F
0.33F C5(*) 100nF C15 30K Vs R14 GND 470K R7
AMSSW
R4 10nF C3
0.68F (*)
C10
1F
C12 4.7F C7 C9 100K R9 Vs
D93AU049A
Vs R15 OUTL C16 100nF GND
TR1
R1
R3
1F C1 0.68F C20
1K
1.2K
6.8K
(*) Capacitor tolerance is 10%
TDA7336
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TDA7336
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 Vs OUTR R10 100K 4.7F C13 0.68F(*) TCR DOUTR 17 19 NRSW C11 AMSGout 22 21 18 R5 300K R6 EQRO DINR AMSGin 23 20 24 RN 1.2K DOLBY OUTR 25 RM 10nF C4 0.33F C6(*) R8 10K
6.8K
0.22F C8
1F C2
R2
EQRI
26
36dB
INPUT R AMP2 AMS AMP2
INR
27
16
VREF 4.7F C14 15 Vs
Vs GND Vs
300pF
600
AMP1
INPUT L
INL
2
AMP1
BIAS 13 IREF
0.22F C18
300pF
600
36dB
1
GND
R11 43K
RM 4 28 5 6 7 DINL INTP 8 9 INTS
RN 1.2K 11 TCL
DOLBY 12 DOUTL 10 MUTE
3
EQ SW OUTL
EQLI 300K 10nF C3 100nF C15 GND Vs 470K R7
EQLO
0.1F
R1 6.8K
R3
C7 C9
1F
0.33F C5(*)
AMSSW
R4
0.68F (*) 100K R9 Vs
C10
C12 4.7F OUTL
D93AU050A
1F C1
1.8K
(*) Capacitor tolerance is 10%
TDA7336
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TDA7336
ELECTRICAL CHARACTERISTICS (VS = 8.5V; f = 1KHz; R g = 600 T amb = 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 16) DC Voltage pin 13 (R11 = 43K) Ripple Rejection (Input Referred) Mute Threshold Pin 10 Mute Current Mute Attenuation Vripple = 0.3Vrms fripple = 1KHz ON OFF Dolby OFF Dolby ON Test Condition Min. 8 11 4 1.15 80 85 0 2.0 55 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
RI II GV GV RM RN eN Input Resistance Input Bias Current Closed Loop Gain Closed Loop Gain Match Resistance Metal Position Resistance Normal Position Total Input Noise Unw. B= 20Hz to 20KHz Rg = 0; Rg = 600; A weighted Rg = 600; (Pin 5, 24) 0.9 0 3.5 -2 0 pin 3, 4 and 25, 26 shorted 32.5 -1 4.35 50 35.5 5.8 160 0.45 0.8 0.5 1.2 1.7 1.5 VS +2 (pin 2, 27) 30 50 70 10 38.5 1 7.25 300 K A dB dB K V V V K V V %
RO EQl EQh RM
Output Impedance Normal Low Level (pin 28) Metal High Level (pin 28) Metal Resistance Matching
AUDIO MUSIC SENSOR
IAMSOUT VAMSOUT RP20 AMSswl AMSswh VTH1 VTH2 AMSth IAMSsw 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 8) (pin 9) see note (3) IAMOUT = 2mA 0.8 0 2 1.2 4 0.6 5 200 1.1 5 800 1.4 0.8 VS 1.7 4.6 1.4 15 mA mV K V V V V V A
1.45 4.3 1 10
DOLBY SECTION
GV GV RDI S/H RDO B DEC 1 Voltage Gain Gain Matching Dolby Input Res. Signal Handling Dolby Output Imp. Decode Out f = 1KHz; (pin 6, 23) VS = 8V; THD = 1% (pin 12, 17) f = 10KHz; VI = 0.4dB ON OFF OFF OFF -1 -0.5 46 12 100 -1.5 0 63 13 200 0 300 1.5 1 0.5 dB dB K dB dB
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TDA7336
ELECTRICAL CHARACTERISTICS (continued) DOLBY SECTION
Symbol B DEC 2 B DEC 3 B DEC 4 B DEC 5 NRl NRh Parameter Decode Out Decode Out Decode Out Decode Out Dolby ON Low Level Pin 19 Dolby OFF High Level Pin 19 Test Condition f = 500Hz; VI = -22.1dB f = 2KHz; VI = -18dB f = 5KHz; VI = -29.7dB f = 10KHz; VI = -29.6dB DOLBY ON ON ON ON Min. -26.5 -26.5 -41.5 -41.5 0 2 Typ. -25 -25 -40 -40 Max. -23.5 -23.5 -38.5 -38.5 0.8 VS Unit 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 54 56 50 56 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
Figure 2: Audio Music Sensor
AMS Gin RB 0.22F C8 IN-L
20
1K Rp20 Vs
100K R9 SIGNAL DETECT. COMPARATOR +
8
INTP 0.1F C7 R7 500K
6
IN-R
23
LIMITER AMPLIFIER AMS th Vs NOR1 Q1
Vth0
POWER-ON RESET AMS OUT 21 Q2 Q FF2 R
Vth2
S COMP2
+
7 AMS SW R9
9 INTS
C15
T1
SPACE DETECTION TIME Vs
COMP1 Vth1 Q Q FF1 S R 22 T2
D93AU051A
+
+
PROGRAM DETECTION TIME
C9
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TDA7336
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 unproper operations. 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 presented 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 Vpin7)/IC15 is given approximately by 0.122 x C15 ns where C15 is in F. 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. 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 8 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.
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TDA7336
Figure 3: AMS Timing Diagram
Figure 4
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TDA7336
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 100nF 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 - 27 Figure 6: PINS: 6 - 23
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TDA7336
PINS DESCRIPTION: Internal Configuration Figure 7: PINS: 12 - 17 Figure 8: PIN: 8
Figure 9: PINS: 3 - 26
Figure 10: PINS: 4 - 25
Figure 11: PINS: 5 - 24
Figure 12: PINS: 7
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TDA7336
PINS DESCRIPTION: Internal Configuration Figure 13: PINS: 11 - 18 Figure 14: PIN: 13
Figure 15: PIN: 9
Figure 16: PIN: 21
Figure 17: PIN: 20
Figure 18: PIN: 28
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TDA7336
PINS DESCRIPTION: Internal Configuration Figure 19: PIN: 19 - 10 Figure 20: PIN: 16
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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TDA7336
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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TDA7336
DEVICE CHARACTERISTICS (continued) Figure 31: Ripple Rejection vs. Frequency Figure 32: Mute Attenuation vs. Frequency
Figure 33: Mute Threshold
Figure 34: Vref & Iref vs Supply Voltage
Figure 35: Vref & Iref vs Temperature
Figure 36: D.C. Voltage pin 13 vs. Supply Voltage
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TDA7336
DEVICE CHARACTERISTICS (continued) Figure 37: Equalizer Threshold Figure38: Noise Reduction Threshold
Figure 39: NAB Network
Figure 40: Load Characteristics
Normal Metal
Figure 41: Signaling Handling vs. Supply Voltage
Figure 42: Signal Handling vs. Temperature
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TDA7336
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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TDA7336
DEVICE CHARACTERISTICS (continued) Figure 49: Dolby-B Table
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TDA7336
DIM. MIN. A a1 b b1 C c1 D E e e3 F L S 7.4 0.4 17.7 10 0.1 0.35 0.23
mm TYP. MAX. 2.65 0.3 0.49 0.32 0.5 45 (typ.) 18.1 10.65 1.27 16.51 7.6 1.27 0.291 0.016 0.697 0.394 0.004 0.014 0.009 MIN.
inch TYP. MAX. 0.104 0.012 0.019 0.013 0.020
OUTLINE AND MECHANICAL DATA
0.713 0.419 0.050 0.65 0.299 0.050
SO28
8 (max.)
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TDA7336
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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