TDA7336
STEREO PREAMP + AMS + DOLBY B*
NOISE REDUCTION PROCESSOR
DUAL CHANNEL PROCESSOR FOR PLAY-
BACK APPLICATIONS.
STEREO DOLBY B NR SYSTEM
LOW NOISE HEAD PREAMPLIFIER
MUTE, AMS (AUDIO MUSIC SENSOR)
FUNCTIONS
INTERNAL SWITCHES FOR EQUALIZATION
DOLBY REFERENCE LEVEL -6dBm
(388.2mV
RMS
)
MINIMUM NUMBER OF EXTERNAL COMPO-
NENTS
LOW SUPPLY CURRENT (18mA)
MIXED BIPOLAR/CMOS TECHNOLOGY
DESCRIPTION
The TDA7336 is a monolithic BICmos IC de-
signed 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/nor-
mal facilities for amplification of low level signal in
applications requiring very low noise perform-
ances.
Each channel consists of two cascaded opera-
tional 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 op-
erational amplifier whose equalizing external
components fix the frequency response.
The Audio Music Sensor circuit detects the inter-
program space and then the starting point of mu-
sical programs (the interprogram time and pro-
gram 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 Li-
censing Corporation, San Francisco,
California 94103-4813, USA.
This device is available only to Licens-
ing and application information may be
obtained from Dolby Lab.
November 1999
DINL
AMS SW
INTP
INTS
MUTE
DOUTL
TCL
IREF
N.C.
1
3
2
4
5
6
7
8
9
Vs
VREF
DOUTR
NR SW
TCR
AMSGin
AMSOUT
GND DIG
DINR
23
22
21
20
19
17
18
16
15
D94AU052
10
11
12
13
14
28
27
26
25
24
GND
INL
EQLI
EQLO
OUTL
OUTR
EQRO
EQRI
INR
EQ.SW
PIN CONNECTION (Top view)
SO28
ORDERING NUMBER: TDA7336
1/20
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Supply Voltage
12
V
P
tot
Total Power Dissipation
1
W
T
op
Operating Temperature Range
-40 to 85
C
T
stg
Storage Temperature Range
-40 to 150
C
THERMAL DATA
R
th j-pins
Thermal resistance junction-pins
85
C/W
PIN FUNCTIONS
N.
Name
V
DC
(V)
Function
1
GND
Ground
2
IN L
0
Preamplifier Left Input
3,26
EQLI, EQRI
4.6
Equalizer Inputs
4, 25
EQLO, EQRO
4.6
Equalizer Outputs
5, 24
OUTL, OUTR
4.6
Preamplifier Outputs
6, 23
DINL, DINR
V
ref
Dolby NR Inputs
7
AMS SW
5.6
Audio Music Sensor Switch (ON/OFF) HIGH = ON
8
INTP
Interprogram Time Constant ("Signal Detection")
9
INTS
Interspace Time Constant ("Blank Detection")
10
MUTE
Mute Switch ON = LOW (2)
11, 18
TLC, TCR
0.4
Dolby Time Constants
12, 17
DOUTL, DOUTR
V
ref
Dolby Outputs
13
I
ref
1.2
Reference Current Source
15
V
S
Positive Power Supply
16
V
ref
V
S
/2
Reference Voltage
19
NR SW
Noise reduction ON/OFF: HIGH =OFF (2)
20
AMS GIN
1.4
Audio Music Sensor Input Pin
21
AMS OUT
Audio Music Sensor Output Pin (open collector configuration, see Fig. 2)
22
GND DIG.
0
Digital Ground
27
IN R
0
Preamplifier Right Input
28
EQ SW
0
Equalizer Switch (Low = normal position High = metal position)
(2) Internal pull-up resistor (digital high level if pin left open)
TDA7336
2/20
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).
TDA7336
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