TDA7460.pdf

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CAR RADIO SIGNAL PROCESSOR
TDA7460
CAR RADIO SIGNAL PROCESSOR
PRODUCT PREVIEW
DEVICE INCLUDES AUDIO PROCESSOR,
STEREO DECODER, NOISEBLANKER AND
HIGHCUT FUNCTIONS.
HIGH PERFORMANCE SIGNAL PROCES-
SOR
NO EXTERNAL COMPONENTS REQUIRED
FULLY PROGRAMMABLE VIA I 2 C BUS
LOW DISTORTION
LOW NOISE
SO20
DESCRIPTION
The TDA7460 is a high performance signal proc-
essor specifically designed for car radio applica-
tions.
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.
Switching-capacitors design technique allows to
obtain all these features without external compo-
ORDERING NUMBER: TDA7460D
nents or adjustments. This means that higher
quality and reliability walks alongside an overall
cost saving.
The CSP is fully programmable by I2C 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.
BLOCK DIAGRAM
CDL CDG CDR
SOFT MUTE
OUT LR
OUT LF
OUT RR
OUT RF
OUT LR
AM
MIXING
STAGE
LOUDNESS
VOLUME
SOFT
MUTE
TREBLE
BASS
OUT LF
OUT RR
OUT RF
CASS R
INPUT
MULTIPLEXER
+
AUTO ZERO
CASS L
PHONE
PHONE
(MPIN)
BEEP
DIGITAL CONTROL
I 2 C BUS
SCL
SDA
PHONE GND
(MPOUT)
FM R
FM L
MPX
80KHz
LP
PILOT
CANCELLATION
DEMODULATOR
+ STEREO ADJUST
+ STEREO BLEND
25KHz
LP
S&H
HIGH
CUT
CONTROL
PIL
DET
D
VDD
SUPPLY
PLL
MULTIPATH-
DETECTOR
NOISE
BLANKER
PULSE
FORMER
A
GND
CREF
LEVEL
D97AU629
November 1997
1/29
This is preliminary information on a new product now in development. Details are subject to change without notice.
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TDA7460
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V S
Operating Supply Voltage
10.5
V
T amb
Operating Ambient Temperature Range
-40 to 80
C
T stg
Operating Storage Temperature Range
-55 to 150
C
Supply
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V S
Supply Voltage
7.5
9
10
V
I S
Supply Current
VS = 9V
30
mA
SVRR
Ripple Rejection @ 1KHz
Audioprocessor (all filters flat)
60
dB
Stereodecoder + Audioprocessor
55
dB
ESD
All pins are protected against ESD according to the MIL883 standard.
PIN CONNECTION
CASS R
CASS L
CDR
CDGND
CDL
1
20
CREF
2
19
OUT LF
3
18
17
16
15
14
OUT RF
4
5
6
7
8
9
OUT LR
OUT RR
VDD
PHGND (MPOUT)
PHONE (MPIN)
GND
AM
MPX
13
SDA
12
SCL
LEVEL
10
11
SMUTE
D97AU628
THERMAL DATA
Symbol
Parameter
Value
Unit
R th j-pins
Thermal Resistance Junction-pins
Max
85
°
C/W
2/29
°
°
389385321.003.png
TDA7460
AUDIO PROCESSOR PART
Input Multiplexer
Fully differential or quasi-differential CD Stereo
input
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
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
Loudness
Second order frequency response
Programmable center frequency and quality factor
Selectable flat-mode (constant attenuation)
Speaker Control
4 independent speaker controls (1dB steps
with 50dB control range)
Volume control
1dB attenuator
Max. gain 20dB
Max. attenuation 79dB
Soft-step gain control
Mute Functions
Direct mute
Digitally controlled softmute with 4 program-
mable time constants
ELECTRICAL CHARACTERISTICS (V S = 9V; T amb =25
°
C; R L = 10K
W
; all gains = 0dB; f = 1KHz;
unless otherwise specified).
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
INPUT SELECTOR
R in
Input Resistance
All inputs except Phone
100
K
W
V CL
Clipping Level
2.6
V RMS
S IN
Input Separation
80
100
dB
G IN MIN
Min. Input Gain
-1
0
1
dB
G IN MAX
Max. Input Gain
14
dB
G STEP
Step Resolution
2
dB
V DC
DC Steps
Adjacent Gain Step
2
mV
G MIN to G MAX
6
mV
DIFFERENTIAL CD STEREO INPUT
R in
Input Resistance
Differential mode
70
100
130
K
W
Common Mode
20
30
40
K
W
CMRR
Common Mode Rejection Ratio V CM =1 VRMS @ 1KHz
45
70
dB
V CM =1 VRMS @ 10KHz
45
60
dB
G IN MAX
Max. Input Gain
20Hz to 20KHz flat; all stages
0dB
9
m
V
DIFFERENTIAL PHONE INPUT
R in
Input Resistance
Differential
10
15
20
K
W
Common Mode
20
30
40
K
W
CMRR
Common Mode Rejection Ratio V CM =1 VRMS @ 1KHz
45
70
dB
V CM =1 VRMS @ 10KHz
45
60
dB
3/29
389385321.004.png
TDA7460
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
BEEP CONTROL
V RMS
Beep Level
350
mV
f BMIN
Lower Beep Frequency
600
Hz
f BMAN
Higher Beep Frequency
1.2
KHz
MIXING CONTROL
M LEVEL
Mixing Level
Source
0
dB
Source
-6
dB
Source
-12
dB
Beep/Phone
0
dB
VOLUME CONTROL
G MAX
Max Gain
20
dB
A MAX
Max Attenuation
79
dB
A STEP
Step Resolution
1
dB
E A
Attenuation Set Error
G = -20 to 20dB
-1.25
0
1.25
dB
G = -60 to 20dB
-4
0
3
dB
E T
Tracking Error
2
dB
V DC
DC Steps
Adjacent Attenuation Steps
0.1
3
mV
From 0dB to G MIN
0.5
5
mV
LOUDNESS CONTROL
A STEP
Step Resolution
1
dB
A MAX
Max. Attenuation
15
dB
f CMIN
Lower Center Frequency
200
Hz
f CMAX
Higher Center Frequency
400
Hz
SOFT MUTE
A MUTE
Mute Attenuation
80
100
dB
T D
Delay Time
T1
0.48
ms
T2
0.96
ms
T3
40.4
ms
T4
324
ms
V THlow
Low Threshold for SM-Pin 1
1
V
V THhigh
High Threshold for SM - Pin
2.5
V
R PD
Internal Pull-up Resistor
100
K
W
SOFT STEP
T SW
Switch Time
10
ms
1) The SM pin is active low (Mute = 0)
4/29
389385321.005.png
TDA7460
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
BASS CONTROL
C RANGE
Control Range
14
dB
A STEP
Step Resolution
2
dB
f C
Center Frequency
f C1
60
ms
f C2
70
ms
f C3
80
ms
f C4
100
Hz
Q BASS
Quality Factor
Q 1
1
Q 2
1.25
Q 3
1.5
Q 4
2
DC GAIN
Bass-Dc-Gain
DC = off
0
dB
DC = on
4.4
dB
TREBLE CONTROL
C RANGE
Control Range
14
dB
A STEP
Step Resolution
1
dB
f C
Center Frequency
f C1
10
KHz
f C2
12.5
KHz
f C3
15
KHz
f C4
17.5
KHz
SPEAKER ATTENUATORS
C RANGE
Control Range
50
dB
A STEP
Step Resolution
1
dB
A MUTE
Output Mute Attenuation
80
90
dB
E E
Attenuation Set Error
2
dB
V DC
DC Steps
Adjacent Attenuation Steps
0.1
5
mV
AUDIO OUTPUTS
V CLIP
Clipping Level
d = 0.3%
2.2
2.6
V RMS
R L
Output Load Resistance
2
K
W
C L
Output Load Capacitance
10
nF
R OUT
Output Impedance
30
120
W
V DC
DC Voltage Level
3.8
V
GENERAL
e NO
Output Noise
BW = 20 Hz to 20 KHz
output muted
3
m
V
BW = 20 Hz to 20 KHz
all gain = 0dB
6.5
m
V
S/N
Signal to Noise Ratio
all gain = 0dB flat; V O =2V RMS
110
dB
Bass & Treble at 12dB; a-
weighted; V O = 2.6V RMS
100
dB
d
Distortion
V IN =1V RMS ; all stages 0dB
0.002
0.05
%
V IN =1V RMS ; Bass & Treble = 12dB
0.05
%
S C
Channel separation Left/Right
80
100
dB
E T
Total Tracking Error
A V = 0 to -20dB
0
1
dB
A V = -20 to -60dB
0
2
dB
2) See description of Audioprocessor Part
5/29
±
±
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