®
TDA7403
BASIC SIGNAL PROCESSOR
DEVICE INCLUDES AUDIO PROCESSOR,
STEREO DECODER AND NOISEBLANKER
HIGH PERFORMANCE SIGNAL PROCES-
SOR WITH BASIC FUNCTIONS
AM, FM, (MPX) AND CASSETTE INPUTS
NO EXTERNAL COMPONENTS REQUIRED
FULLY PROGRAMMABLE VIA I
2
C BUS
LOW DISTORTION AND NOISE
SO20
DESCRIPTION
The TDA7403 is a high performance signal proc-
essor specifically designed for car radio applica-
tions focused on the low-end market.
The device includes a complete audioprocessor
and a stereo decoder with noiseblanker.
Switched-capacitors design technique allows to
obtain all these features without external compo-
nents or adjustments. Using TDA7403 results is
in a very performant low-cost signal processing
BLOCK DIAGRAM
SM
ORDERING NUMBER:
TDA7403D
application
The device is fully programmable by I
2
C bus in-
terface allowing to customize key device parame-
ters and especially filter characteristics.
The BICMOS process combined with the opti-
mized signal processing assure low noise and
low distortion performances.
11
8
SOFT
MUTE
OUT LR
TREBLE
BASS
OUT LF
OUT RR
OUT RF
17
19
16
18
OUT LR
OUT LF
OUT RR
OUT RF
AM
VOLUME
CASS R
CASS L
1
2
INPUT
MULTIPLEXER
+
AUTO ZERO
12
DIGITAL CONTROL
I C BUS
2
13
SCL
SDA
FM R
FM L
MPX
9
80KHz
LP
PILOT
CANCELLATION
DEMODULATOR
+ STEREO ADJUST
+ STEREO BLEND
25KHz
LP
S&H
HIGH
CUT
CONTROL
V
S
15
SUPPLY
PLL
PIL
DET
D
NOISE
BLANKER
PULSE
FORMER
A
10
LEVEL
D98AU918
14
GND
20
CREF
November 2002
1/25
TDA7403
ABSOLUTE MAXIMUM RATINGS
Symbol
V
S
T
amb
T
stg
Operating Supply Voltage
Operating Ambient Temperature Range
Operating Storage Temperature Range
Parameter
Value
10.5
-40 to 80
-55 to 150
Unit
V
°C
°C
SUPPLY
Symbol
V
S
I
S
SVRR
Parameter
Supply Voltage
Supply Current
Ripple Rejection @ 1KHz
V
S
= 9V
Audioprocessor (all filters flat)
Stereodecoder + Audioprocessor
Test Condition
Min.
7.5
25
Typ.
9
30
60
55
Max.
10
35
Unit
V
mA
dB
dB
ESD
All pins are protected against ESD according to the MIL883 standard.
PIN CONNECTION
CASS R
CASS L
N.C.
N.C.
N.C.
N.C.
N.C.
AM
MPX
LEVEL
1
2
3
4
5
6
7
8
9
10
D98AU919
20
19
18
17
16
15
14
13
12
11
CREF
OUT LF
OUT RF
OUT LR
OUT RR
V
S
GND
SDA
SCL
SM
THERMAL DATA
Symbol
R
th-j pins
Parameter
Thermal Resistance Junction-pins
Max
Value
85
Unit
°C/W
2/25
TDA7403
PIN DESCRIPTION
N.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Name
CASSR
CASSL
n.c.
n.c.
n.c.
n.c.
n.c.
AM
MPX
LEVEL
SM
SCL
SDA
GND
VS
OUTRR
OUTLR
OUTRF
OUTLF
CREF
Cassette Input Right
Cassette Input Left
not connected
not connected
not connected
not connected
not connected
AM Input
FM Input (MPX)
Level Input Stereodecoder
Soft Mute Drive
I C Clock Line
I
2
C Data Line
Supply Ground
Supply Voltage
Right Rear Speaker Output
Left Rear Speaker Output
Right Front Spaeaker Output
Left Front Speaker Output
Reference Capacitor Pin
2
Function
Type
I
I
I
I
I
I
I/O
I/O
S
S
O
O
O
O
S
(1) See input configuration tree and databyte specification "configuration"
Pin type legenda:
I = Input
O = Output
I/O = Input/Output
S = Supply
3/25
TDA7403
AUDIO PROCESSOR PART
Input Multiplexer
MPX input
Cassette stereo input
AM mono
Volume control
1dB attenuator
Max. gain 20dB
Max. attenuation 79dB
Soft-step gain control
Bass Control
2nd order frequency response
Center frequency programmable in 4(5) steps
DC gain programmable
7 x 2dB steps
Treble Control
2nd order frequency response
Center frequency programmable in 4 steps
7 x 2dB steps
Speaker Control
4 independent speaker controls (1dB steps
control range 50dB)
Mute Functions
Direct mute driven by pin SM
Digitally controlled softmute with 4 program-
mable time constants
ELECTRICAL CHARACTERISTICS
(V
S
= 9V; T
amb
= 25°C; R
L
= 10KΩ; all gains = 0dB; f = 1KHz;
unless otherwise specified).
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
INPUT SELECTOR
R
in
V
CL
S
IN
G
IN MIN
G
IN MAX
G
STEP
V
DC
Input Resistance
Clipping Level
Input Separation
Min. Input Gain
Max. Input Gain
Step Resolution
DC Steps
Adjacent Gain Step
G
MIN
to G
MAX
all inputs except Phone
70
2.2
80
-1
100
2.6
100
0
14
2
0
1
130
KΩ
V
RMS
dB
dB
dB
dB
mV
mV
1
VOLUME CONTROL
G
MAX
A
MAX
A
STEP
E
A
E
T
V
DC
Max Gain
Max Attenuation
Step Resolution
Attenuation Set Error
Tracking Error
DC Steps
G = -20 to 20dB
G = -60 to 20dB
Adjacent Attenuation Steps
From 0dB to G
MIN
-1.25
-4
20
79
1
0
0
0.1
0.5
1.25
3
2
3
5
dB
dB
dB
dB
dB
dB
mV
mV
SOFT MUTE
A
MUTE
T
D
Mute Attenuation
Delay Time
70
T1
T2
T3
T4
V
THlow
V
THhigh
R
PU
V
PU
4/25
Low Threshold for SM Pin
(1)
High Threshold for SM Pin
Internal Pull-up Resistor
Pull-up Voltage
2.5
70
100
4.7
100
0.48
0.96
40.4
324
1
130
dB
ms
ms
ms
ms
V
V
KΩ
V
TDA7403
ELECTRICAL CHARACTERISTICS
(continued)
Symbol
Parameter
Switch Time
Control Range
Step Resolution
Center Frequency
Test Condition
Min.
Typ.
10
±14
2
60
70
80
100
(2)
1
1.25
1.5
2
0
4.4
±14
2
10
12.5
15
17.5
50
1
80
Adjacent Attenuation Steps
d = 0.3%
2.2
2
0.1
2.6
10
120
3
10
Max.
Unit
ms
dB
dB
Hz
Hz
Hz
Hz
SOFT STEP
T
SW
C
RANGE
A
STEP
f
C
BASS CONTROL
Q
BASS
Quality Factor
DC
GAIN
Bass-Dc-Gain
f
C1
f
C2
f
C3
f
C4
Q
1
Q
2
Q
3
Q
4
DC = off
DC = on
dB
dB
dB
dB
KHz
KHz
KHz
KHz
dB
dB
dB
dB
mV
V
RMS
KΩ
nF
Ω
V
µV
µV
dB
dB
%
%
dB
dB
dB
TREBLE CONTROL
C
RANGE
A
STEP
f
C
Control Range
Step Resolution
Center Frequency
f
C1
f
C2
f
C3
f
C4
SPEAKER ATTENUATORS
C
RANGE
A
STEP
A
MUTE
E
E
V
DC
V
CLIP
R
L
C
L
R
OUT
V
DC
Control Range
Step Resolution
Output Mute Attenuation
Attenuation Set Error
DC Steps
Clipping Level
Output Load Resistance
Output Load Capacitance
Output Impedance
DC Voltage Level
Output Noise
AUDIO OUTPUTS
30
3.8
BW = 20 Hz to 20 KHz
output muted
BW = 20 Hz to 20 KHz
all gain = 0dB
all gain = 0dB flat; V
O
= 2V
RMS
bass treble at 12dB; V
O
=
2.6V
RMS
V
IN
= 1V
RMS
; all stages 0dB
V
IN
= 1V
RMS
; Bass & Treble = 12dB
80
A
V
= 0 to -20dB
A
V
= -20 to -60dB
5
10
106
96
0.002
0.05
100
0
0
GENERAL
e
NO
S/N
Signal to Noise Ratio
d
S
C
E
T
Distortion
Channel separation Left/Right
Total Tracking Error
1
2
1) SM pin is active low (mute condition)
2) See description of Audioprocessor Part - Bass & Treble filter characteristics programming
5/25
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