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PDF TDA7461ND Data sheet ( Hoja de datos )
| Número de pieza | TDA7461ND | |
| Descripción | CAR RADIO SIGNAL PROCESSOR | |
| Fabricantes | ST Microelectronics | |
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® 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 I2C 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
ORDERING NUMBER: TDA7461ND
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.
CDL CDG CDR
765
10
AM
CASS R
CASS L
3
4
9
PHONE
INPUT
MULTIPLEXER
+
AUTO ZERO
MIXING
STAGE
PHONE
BEEP
8
PH GND
LOUDNESS
VOLUME
SMUTE
17
SOFT
MUTE
TREBLE
DIGITAL CONTROL
28
BASS
27 1 2
23
OUT LR
OUT LR
25
OUT LF
OUT LF
22
OUT RR
OUT RR
24
OUT RF
OUT RF
I2C BUS
18
SCL
19
SDA
16
MUX R
15
MUX L
11
MPX
80KHz
LP
PILOT
CANCELLATION
DEMODULATOR
+ STEREO ADJUST
+ STEREO BLEND
25KHz
LP
S &H
HIGH
CUT
CONTROL
21
VS
SUPPLY
20 26
GND CREF
PLL
PIL
DET
MULTIPATH-
DETECTOR
13
MPIN
14
MPOUT
NOISE
BLANKER
PULSE
FORMER
D
A
12
LEVEL
D97AU646A
June 2000
1/31
1 page  
TDA7461N
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
BEEP CONTROL
VRMS
Beep Level
fBMIN
Lower Beep Frequency
fBMAX
Higher Beep Frequency
MIXING CONTROL
MLEVEL Mixing Level
VOLUME CONTROL
GMAX
Max Gain
AMAX
Max Attenuation
ASTEP
Step Resolution
EA Attenuation Set Error
ET Tracking Error
VDC DC Steps
LOUDNESS CONTROL
ASTEP
Step Resolution
AMAX
Max. Attenuation
fCMIN
Lower Center Frequency
fCMAX
Higher Center Frequency
SOFT MUTE
AMUTE Mute Attenuation
TD Delay Time
VTHlow
VTHhigh
RPU
VPU
Low Threshold for SM Pin1
High Threshold for SM Pin
Internal Pull-up Resistor
Pull-up Voltage
SOFT STEP
TSW Switch Time
1) The SM pin is active low (Mute = 0)
Test Condition
Source
Source
Source
Beep/Phone
G = -20 to 20dB
G = -60 to 20dB
Adjacent Attenuation Steps
From 0dB to GMIN
T1
T2
T3
T4
Min. Typ. Max. Unit
250 350 500 mV
570 600 630
Hz
1.15 1.2 1.25 KHz
-1 0
1 dB
-5 -6 -7 dB
-10 -12 -14 dB
-1 0
1 dB
19 20 21 dB
-83 -79 -75 dB
0.5 1 1.5 dB
-1.25
0
1.25 dB
-4 0
3 dB
2 dB
-3 0.1 3 mV
-7 0.5 +7 mV
0.5 1 1.5
-16 -15 -14
180 200 220
360 400 440
dB
dB
Hz
Hz
60 100
0.48 1
0.96 2
20 40.4 60
200 324 600
1
2.5
70 100 130
4.7
dB
ms
ms
ms
ms
V
V
KΩ
V
5 10 15 ms
5/31
5 Page 
Figure 8. Bass Control @ fc = 80Hz, Q = 1
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
10.0
100.0
1.0K
10.0K
Figure 10. Bass Quality factors @ Gain =
14dB, fc = 80Hz
15.0
12.5
10.0
7.5
5.0
2.5
0.0
10.0
100.0
1.0K
10.0K
Figure 12. Treble Control @ fc = 17.5KHz
15.0
10.0
5.0
0.0
-5.0
-10.0
-15.0
10.0
100.0
1.0K
10.0K
TDA7461N
Figure 9. Bass Center @ Gain = 14dB, Q = 1
15.0
12.5
10.0
7.5
5.0
2.5
0.0
10.0
100.0
1.0K
10.0K
Figure 11. Bass normal and DC Mode @ Gain
= 14dB, fc = 80Hz
15.0
12.5
10.0
7.5
5.0
2.5
0.0
10.0
100.0
1.0K
10.0K
Note: In general the center frequency, Q and DC-mode can be set
independently. The exception from this rule is the mode (5/xx1111xx)
where the center frequency is set to 150Hz instead of 100Hz.
Figure 13. Treble Center Frequencies
@ Gain = 14dB
15.0
12.5
10.0
7.5
5.0
2.5
0.0
10.0
100.0
1.0K
10.0K
11/31
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet TDA7461ND.PDF ] | |
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