®
TDA7461N
CAR RADIO SIGNAL PROCESSOR
HIGH PERFORMANCE SIGNAL PROCES-
SOR FOR CAR RADIO SYSTEMS
DEVICE INCLUDES AUDIO PROCESSOR,
STEREO DECODER, NOISEBLANKER AND
MULTIPATH DETECTOR
NO EXTERNAL COMPONENTS REQUIRED
FULLY PROGRAMMABLE VIA I
2
C BUS
LOW DISTORTION
LOW NOISE
DESCRIPTION
The TDA7461N is a high performance signal
processor specifically designed for car radio ap-
plications.
The device includes a complete audioprocessor
and a stereo decoder with noiseblanker,
stereoblend and all signal processing functions
necessary for state-of-the-art as well as future car
radio systems.
Switched-capacitors design technique allows to
obtain all these features without external compo-
BLOCK DIAGRAM
SO28
DIP28
ORDERING NUMBERS:
TDA7461ND
TDA7461N
nents or adjustments. This means that higher
quality and reliability walks alongside an overall
cost saving.
The CSP is fully programmable by I
2
C bus inter-
face allowing to customize key device parameters
and especially filter characteristics.
The BICMOS process combined with the opti-
mized signal processing assure low noise and
low distortion performances.
ACOUTR
ACOUTL
CDL
7
10
CDG
6
CDR
5
MIXING
STAGE
SMUTE
17
SOFT
MUTE
28
ACINR
ACINL
27
1
2
OUT LR
OUT LF
OUT RR
OUT RF
23
25
22
24
OUT LR
OUT LF
OUT RR
OUT RF
AM
LOUDNESS
VOLUME
TREBLE
BASS
CASS R
CASS L
3
4
INPUT
MULTIPLEXER
+
AUTO ZERO
PHONE
BEEP
DIGITAL CONTROL
18
I
2
C BUS
19
PHONE
9
SCL
SDA
PH GND
8
16
15
MUX R
MUX L
MPX
11
80KHz
LP
PILOT
CANCELLATION
DEMODULATOR
+ STEREO ADJUST
+ STEREO BLEND
25KHz
LP
S&H
HIGH
CUT
CONTROL
VS
21
SUPPLY
PLL
PIL
DET
D
MULTIPATH-
DETECTOR
13
MPIN
14
MPOUT
NOISE
BLANKER
PULSE
FORMER
A
12
LEVEL
D97AU646A
20
GND
26
CREF
October 2003
1/32
TDA7461N
ABSOLUTE MAXIMUM RATINGS
Symbol
V
S
T
amb
T
stg
Operating Supply Voltage
Operating Ambient Temperature Range
Storage Temperature Range
Parameter
Value
10.5
-40 to 85
-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
45
Max.
10
35
Unit
V
mA
dB
dB
ESD
All pins are protected against ESD according to the MIL883 standard.
PIN CONNECTION
ACINL
ACINR
CASSR
CASSL
CDR
CDGND
CDL
PH GND
PHONE
AM
MPX
LEVEL
MPIN
MPOUT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
D97AU647
28
27
26
25
24
23
22
21
20
19
18
17
16
15
ACOUTL
ACOUTR
CREF
OUTLF
OUTRF
OUTLR
OUTRR
VS
GND
SDA
SCL
SMUTE
MUXR
MUXL
THERMAL DATA
Symbol
R
th-j pins
Parameter
Thermal Resistance Junction-pins
Max
DIP28
65
SO28
85
Unit
°C/W
2/32
TDA7461N
PIN DESCRIPTION
N.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Name
ACINL
ACINR
CASSR
CASSL
CDR
CDGND
CDL
PHGND
PHONE
AM
MPX
LEVEL
MPIN
MPOUT
MUXL
MUXR
SMUTE
SCL
SDA
GND
VS
OUTRR
OUTLR
OUTRF
OUTLF
CREF
ACOUTR
ACOUTL
Speaker Stage Input Left
Speaker Stage Input Right
Cassette Input Right
Cassette Input Left
CD Right Channel Input
Ground reference CD
CD Left Channel Input
Phone Ground
Phone Input
AM Input
FM Input (MPX)
Level Input Stereodecoder
Multipath Detector Input
Multipath Detector Output
Multiplexer Output Left Channel (Stereodecoder Output left selectable
1
)
Multiplexer Output Right Channel (Stereodecoder Output right selectable
1
)
Soft Mute Drive
I
2
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
Pre-speaker AC Output Right Channel
Pre-speaker AC Output Left Channel
Function
Type
I
I
I
I
I
I
I
I
I
I
I
I
I
O
O
O
I
I/O
I/O
S
S
O
O
O
O
S
O
O
(1) See databyte specification - speaker attenuators
Pin type legenda:
I = Input
O = Output
I/O = Input/Output
S = Supply
3/32
TDA7461N
AUDIO PROCESSOR PART
Input Multiplexer
Fully differential or quasi-differential CD and
cassette stereo input
AM mono or stereo input
Phone differential or single ended input
Internal beep with 2 frequencies (selectable)
Mixable phone and beep signals
Loudness
Second order frequency response
Programmable center frequency and quality factor
15 x 1dB steps
Selectable flat-mode (constant attenuation)
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
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
13
1
-5
-5
100
2.6
100
0
14
2
0
1
1
15
3
+5
+5
130
KΩ
V
RMS
dB
dB
dB
dB
mV
mV
DIFFERENTIAL CD STEREO INPUT
R
in
CMRR
e
N
Input Resistance
Common Mode Rejection Ratio
Output Noise @ Speaker
Output
Differential
Common Mode
V
CM
= 1
VRMS
@ 1KHz
V
CM
= 1
VRMS
@ 10KHz
20Hz to 20KHz flat; all stages
0dB
70
20
45
45
100
30
70
60
9
130
40
KΩ
KΩ
dB
dB
µV
15
DIFFERENTIAL PHONE INPUT
R
in
CMRR
Input Resistance
Common Mode Rejection Ratio
Differential
Common Mode
V
CM
= 1
VRMS
@ 1KHz
V
CM
= 1
VRMS
@ 10KHz
10
20
45
45
15
30
70
60
20
40
KΩ
KΩ
dB
dB
4/32
TDA7461N
ELECTRICAL CHARACTERISTICS
(continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
BEEP CONTROL
V
RMS
f
BMIN
f
BMAX
Beep Level
Lower Beep Frequency
Higher Beep Frequency
250
570
1.15
350
600
1.2
500
630
1.25
mV
Hz
KHz
MIXING CONTROL
M
LEVEL
Mixing Level
Source
Source
Source
Beep/Phone
-1
-5
-10
-1
0
-6
-12
0
1
-7
-14
1
dB
dB
dB
dB
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
Adjacent Attenuation Steps
From 0dB to G
MIN
-3
-7
0.1
0.5
G = -20 to 20dB
G = -60 to 20dB
19
-83
0.5
-1.25
-4
20
-79
1
0
0
21
-75
1.5
1.25
3
2
3
+7
dB
dB
dB
dB
dB
dB
mV
mV
LOUDNESS CONTROL
A
STEP
A
MAX
f
CMIN
f
CMAX
Step Resolution
Max. Attenuation
Lower Center Frequency
Higher Center Frequency
0.5
-16
180
360
1
-15
200
400
1.5
-14
220
440
dB
dB
Hz
Hz
SOFT MUTE
A
MUTE
T
D
Mute Attenuation
Delay Time
60
T1
T2
T3
T4
100
0.48
0.96
40.4
324
1
2
60
600
1
2.5
70
100
4.7
130
dB
ms
ms
ms
ms
V
V
KΩ
V
20
200
V
THlow
V
THhigh
R
PU
V
PU
Low Threshold for SM Pin
1
High Threshold for SM Pin
Internal Pull-up Resistor
Pull-up Voltage
SOFT STEP
T
SW
Switch Time
5
10
15
ms
1) The SM pin is active low (Mute = 0)
5/32
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