TDA7433
BASIC FUNCTION AUDIO PROCESSOR
TWO STEREO AND ONE MONO INPUTS
CONTROLLED
MUTE FUNCTION (SOFTWARE AND HARD-
WARE)
VOLUME CONTROL IN 1dB STEP
FOUR SPEAKER ATTENUATORS:
Independentattenuation control
Independentmute function
ALL
FUNCTIONS
PROGRAMMABLE
VIA
I
2
CBUS
DESCRIPTION
The TDA7433 is a volume, tone (bass and treble)
balance (Left/Right) processor for quality audio
applications in car radio and Hi-Fi systems.
Control is accomplished by serial bus microproc-
essor interface.
The AC signal setting is obtained by resistor net-
works and switches combined with operational
amplifiers.
Thanks to the advanced BIPOLAR/CMOS Tech-
nology, the external components have been re-
duced.
November 1999
IN1_L
SUPPLY
VS
GND
VOL
BASS
TREBLE
D95AU354A
S BUS DECODER + LATCHES
SPKR
ATT
SPKR
ATT
VOL
BASS
TREBLE
SPKR
ATT
SPKR
ATT
SCL
SDA
RIGHT FRONT
RIGHT REAR
LEFT REAR
LEFT FRONT
IN1_R
MUX
MUX
MONO IN/MUTE
IN2_L
IN2_R
10
9
11
6
3
4
2
5
17
1
8
7
12
16
14
18
19
15
13
20
BINL
BOUTL
TRL
BINR
BOUTR
TRR
CREF
100nF
100nF
4.7K
2.7nF
100nF
100nF
2.7nF
4.7K
BLOCK DIAGRAM
SO20
ORDERING NUMBER: TDA7433D
1/10
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Operating Supply Voltage
10.2
V
T
amb
Operating Temperature Range
-40 to 85
C
T
stg
Storage Temperature Range
-55 to +150
C
QUICK REFERENCE DATA
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
S
Supply Voltage
7
9
10.2
V
V
CL
Max. Input Signal Handling
1.3
1.6
Vrms
THD
Total Harmonic Distortion (V = 1Vrms f = 1kHZ)
0.05
%
S/N
Signal to Noise Ratio
102
dB
Sc
Channel Separation f = 1kHz
100
dB
Volume Control 1dB step
-79
+32
dB
Bass Control 2dB step
-18
+18
dB
Treble Control 2dB step
-14
+14
dB
Speaker Attenuators
-37.5
0
dB
Mute Attenuation
100
dB
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-pins
Thermal Resistance Junction-pins
Max.
150
C/W
CREF
IN2_R
IN2_L
MONO IN/MUTE
IN1_R
BOUT_R
IN1_L
BIN_R
BOUT_L
TRR
OUT_RR
OUT_LR
OUT_LF
OUT_RF
V
S
SCL
SDA
GND
1
3
2
4
5
6
7
8
9
18
17
16
15
14
12
13
11
19
10
20
BIN_L
TRL
D95AU355A
PIN CONNECTION (Top View)
TDA7433
2/10
IN1_L
SUPPLY
VS
GND
VOL
BASS
TREBLE
D95AU356A
S BUS DECODER + LATCHES
SPKR
ATT
SPKR
ATT
VOL
BASS
TREBLE
SPKR
ATT
SPKR
ATT
SCL
SDA
RIGHT FRONT
RIGHT REAR
LEFT REAR
LEFT FRONT
IN1_R
MUX
MUX
MONO/
MUTE
IN2_L
IN2_R
10
9
11
6
3
4
2
5
17
1
8
7
12
16
14
18
19
15
13
20
CREF
BINR
BOUTR
TRR
TRL
BOUTL
BINL
10
F
100nF
100nF
4.7K
2.7nF
100nF
100nF
4.7K
2.7nF
100nF
V
S
9V
100nF
100nF
100nF
100nF
100nF
APPLICATION DIAGRAM
TDA7433
3/10
ELECTRICAL CHARACTERISTICS (T
amb
= 25
C, V
S
= 9V, R
L
= 10k
, R
g
= 50
,
all variable gains = 0dB, f = 1kHz, unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
INPUT SELECTOR
R
IN
Input Resistance
70
100
130
k
V
CL
Clipping Level
d
0.3%
1.3
1.6
Vrms
S
IN
Input Separation
70
100
dB
A
MUTE
Input Mute Attenuation
70
95
dB
V
DC
Mute DC Step
0.2
10
mV
MUTE AT AM INPUT (*)
V
IL
Input Low Voltage
AM not selected
0.4
V
VOLUME CONTROL
G
MAX
Max. Gain
Note 2
30.5
32
33.5
dB
A
MAX
Max Attenuation
75
79
83
dB
A
step
Step Resolution
0.5
1
1.5
dB
E
A
Attenuation Set Error
G = +20 to -20dB
-1.0
0
+1.0
dB
G = -20 to -60dB
-2
2
dB
E
T
Tracking Error
G = -20 to -60dB
2
dB
V
DC
DC Steps
Adjacent Attenuation Steps,
Range from 0 to -79dB
0.1
4
mV
From 0dB to -79dB
0.5
10
mV
BASS CONTROL
B
RANGE
Max. Bass boost
15.5
18
20
dB
B
CUT
Max. Bass cut
-20
-18
15.5
dB
A
Step
Step Resolution
1
2
3
dB
R
B
Internal Feedback Resistance
48
65
82
k
TREBLE CONTROL
C
RANGE
Control Range
13
14
15
dB
A
step
Step Resolution
1
2
3
dB
SPEAKER ATTENUATORS
C
RANGE
Control Range
36
37.5
39
dB
A
step
Step Resolution
From 0 to -24dB
0.5
1
1.5
dB
A
MUTE
Output Mute Attenuation
From 0 to -24dB
70
90
dB
E
A
Attenuation Set Error
1
dB
V
DC
DC Steps
Adjacent Attenuation Steps
0.1
4
mV
AUDIO OUTPUTS
V
CLIP
Clipping Level
d = 0.3%
2
2.5
Vrms
G
OUT
Output Gain (fixed)
4
dB
R
L
Output Load Resistance
AC - connected
3
k
DC connected to GND
5
C
L
Output Load Capacitance
10
nF
R
OUT
Output Impedance
30
100
VDC
DC Voltage Level
3.7
4.0
4.3
V
(*) The mute function can be activated without using the I2C bus by grounding the AM input when AM is not selected. This causes the input
multiplexer to select the reference voltage instead of an input signal.
TDA7433
4/10
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
GENERAL
V
S
Supply Voltage
6
9
10.2
V
I
S
Supply Current
5
8
11
mA
PSRR
Power Supply Rejection Ratio
65
85
dB
e
NO
Output Noise
20Hz - 20kHz "A" - weighted
BW = 200Hz - 20kHz, flat
output muted
4
7.0
5.5
20
V
V
V
S/N
Signal to Noise Ratio
all gains = 0dB; V
O
= 1Vrms
102
dB
d
Distortion
V
OUT
= 1Vrms
0.05
0.15
%
Sc
Channel Separation
70
80
dB
E
T
Total Tracking Error
A
V
= 0 to -20dB
A
V
= -20 to -60dB
0
0
1
2
dB
dB
BUS INPUTS
V
IL
Input Low Voltage
1
V
V
IH
Input High Voltage
3
V
I
IN
Input Current
V
IN
= 0.4V
-5
+5
A
V
O
Output Voltage
SDA Acknowledge
I
O
= 1.6mA
0.15
0.4
V
SOFTWARE SPECIFICATION
Interface Protocol
The interface protocol comprises:
a start condition (S)
a chip address byte (the LSB bit determines read /write transmission)
a subaddress byte
a sequence of data (N-bytes + acknowledge)
a stop condition (P)
S
1
0
0
0
1
0
1
R/W ACK X
X
X
I
A
3
A
2
A
1
A
0
ACK
DATA
ACK P
ACK = Acknowledge
S = Start
P = Stop
MAX CLOCK SPEED 500kbits/s
Auto Increment
If bit I in the subaddress byte is set to "1", the autoincrement of the subaddress is enabled.
CHIP ADDRESS
MSB
LSB
SUBADDRESS
MSB
LSB
MSB
DATA 1...DATA n
LSB
TDA7433
5/10
SUBADDRESS (receive mode)
MSB
LSB
FUNCTION
X
X
X
I
A3
A2
A1
A0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
Input selector
Volume
Bass, Treble
Speaker attenuator LF
Speaker attenuator LR
Speaker attenuator RF
Speaker attenuator RR
I = Auto increment
X = Not used
DATA BYTE SPECIFICATION
X = not relevant; set to "1" during testing
Input Selector
MSB
LSB
FUNCTION
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
0
1
0
1
0
0
0
0
1
0
0
1
1
X
0
1
0
1
X
IN2
IN1
mono IN
no input selected
mute (low homic)
non-symmetrical bass cut (note 1)
symmetrical bass cut
extended bass range
standard bass range
14dB
For example to select the IN2 input the Data Byte is: X X X X X 0 1 0.
An additional direct mute function is included in the Speaker Attenuators.
Note 1: Bass cut for very low frequencies.
MSB
LSB
VOLUME
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
+32dB
+16dB
0dB
-16dB
-32dB
-48dB
-64dB
0
0
0
0
0
0
0
0
1
0
0
0
1
0
0
1
1
0
1
0
1
0dB
-1dB
-2dB
-15dB
Note 2:
It is not recommended to use a gain more than 20dB for system performance reason. In general, the max. gain should be limited by
software to the maximum value, which is needed for the system.
TDA7433
6/10
Bass, Treble
MSB
LSB
FUNCTION
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
D4
Input
Selector
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
0
0
1
1
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
Treble Steps
- 14dB
-12dB
-10dB
-8dB
-6dB
-4dB
-2dB
0dB
0dB
+2dB
+4dB
+6dB
+8dB
+10dB
+12dB
+14dB
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
1
1
0
0
1
1
1
1
0
0
1
1
0
0
0
0
1
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
0
1
Bass Steps
-18dB
-16dB
-14dB
-12dB
-10dB
-8dB
-6dB
-4dB
-2dB
0dB
0dB
+2dB
+4dB
+6dB
+8dB
+10dB
+12dB
+14dB
+16dB
+18dB
For example 12dB Treble and -8dB Bass give the following DATA BYTE: 0 0 1 1 1 0 0
Speaker Attenuators
MSB
LSB
SPEAKER ATTENUATOR
LF,LR,RF,RR
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
0
0
0
0
0
0
0
0
1
0
0
1
1
1
1
1
1
1
1
X
0
0
:
1
1
1
1
1
1
1
1
X
0
0
0
0
0
0
1
1
1
1
X
0
0
0
0
1
1
0
0
1
1
X
0
1
0
1
0
1
0
1
0
1
X
0dB
-1dB
:
-24dB
-25.5dB
-27dB
-28.5dB
-30dB
-32dB
-34.5dB
-37.5dB
Speaker Mute
normal
range
14dB
TDA7433
7/10
Functional Description
The input selector is able to select 2 stereo inputs
and 1 mono input (AM). The inputs are DC biased
with 100k
resistors to the internal reference volt-
age of 3V. The mono input can be used addition-
ally as hardware mute pin. If this pin is pulled to
ground by an external transistor and AM is not se-
lected, the input selector mutes the input (refer-
ence voltage selected). The AM part is consid-
ered to be switched OFF. If the output of the AM
part is not high ohmic in this condition, a series
resistor of about 20k
has to be foreseen.
The volume control can be programmed from a
gain of +32dB to an attenuation of -79dB in 1dB
steps. The maximum gain should be kept as low
as possible for system performance reason. It has
to be limited by software to the absolute neces-
sary system gain, depending on the signal source
level and the power amplifier gain.
The bass control acts in a range from +18dB to -
18dB in 2dB steps. The filter response is deter-
mined by the external filter components. An ex-
tensive simulation software is available in order to
support the design of the bass filter response with
different filter configurations.
The extended bass boost range of +18dB allows
the implementation of the software loudness func-
tion by additional bass and treble boost.
The treble control acts in a range of
14dB in 2dB
steps. The external capacitor determines with the
internal resistor of 50K
the corner frequency of
the treble response.
The four speaker attenuators can be controlled in-
dependently from 0 to -37.5dB, which allows the
implementation of balance and fader a the four
speaker system. The attenuation steps size is 1
db from 0 to -24dB and increases non linearly up
to the maximum attenuation of 37.5dB. A special
mute bit forces the speaker attenuator into the
mute position.
All 4 outputs are low distortion push pull outputs,
able to drive a load of 3k
.
TDA7433
8/10
1
1
0
11
20
A
e
B
D
E
L
K
H
A1
C
SO20MEC
h x 45
SO20
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
2.35
2.65
0.093
0.104
A1
0.1
0.3
0.004
0.012
B
0.33
0.51
0.013
0.020
C
0.23
0.32
0.009
0.013
D
12.6
13
0.496
0.512
E
7.4
7.6
0.291
0.299
e
1.27
0.050
H
10
10.65
0.394
0.419
h
0.25
0.75
0.010
0.030
L
0.4
1.27
0.016
0.050
K
0
(min.)8
(max.)
OUTLINE AND
MECHANICAL DATA
TDA7433
9/10
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 parti es 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
1999 STMicroelectronics Printed in Italy All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
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TDA7433
10/10
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