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PDF TDA7437T Data sheet ( Hoja de datos )
| Número de pieza | TDA7437T | |
| Descripción | DIGITALLY CONTROLLED AUDIO PROCESSOR | |
| Fabricantes | ST Microelectronics | |
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® TDA7437
DIGITALLY CONTROLLED AUDIO PROCESSOR
INPUT MULTIPLEXER
- FOUR STEREO, ONE MONO INPUT, AND
ONE DIFFERENTIAL INPUT
- SELECTABLE INPUT GAIN FOR OPTIMAL
ADAPTATION TO DIFFERENT SOURCES
FULLY PROGRAMMABLE LOUDNESS
FUNCTION
VOLUME CONTROL IN 1dB STEPS INCLUD-
ING GAIN UP TO 16dB
ZERO CROSSING MUTE, SOFT MUTE AND
DIRECT MUTE
BASS AND TREBLE CONTROL
FOUR SPEAKER ATTENUATORS
- FOUR INDEPENDENT SPEAKERS
CONTROL IN 1dB STEPS FOR
BALANCE AND FADER FACILITIES
PAUSE DETECTOR PROGRAMMABLE
THRESHOLD
ALL FUNCTIONS PROGRAMMABLE VIA SE-
RIAL I2 CBUS
DESCRIPTION
The audioprocessor TDA7437 is an upgrade of
the TDA731X audioprocessor family.
PIN CONNECTION
PQFP44 and TQFP44
ORDERING NUMBERS: TDA7437 (PQFP44)
TDA7437T (TQFP44)
Due to a highly linear signal processing, using
CMOS-switching techniques instead of standard
bipolar multipliers, very low distortion and very
low noise are obtained. Several new features like
softmute, and zero-crossing mute are imple-
mented.
The soft Mute function can be activated in two
ways:
1 Via serial bus (Mute byte, bit D0)
2 Directly on pin 28 through an I/O line of the
microcontroller
Very low DC stepping is obtained by use of a
BICMOS technology.
December 1999
TREB_R
IN_R
MUXOUT_R
LOUD_R
DIFFGND_R
DIFF_R
STEREO4_R
STEREO1_R
STEREO2_R
STEREO3_R
MONO
44 43 42 41 40 39 38 37 36 35 34
1 33
2 32
3 31
4 30
5 29
6 28
7 27
8 26
9 25
10 24
11 23
12 13 14 15 16 17 18 19 20 21 22
OUT_RF
OUT_LR
MID_RI
MID_RO
OUT_RR
SMEXT
BASS_RO
BASS_RI
BASS_LO
BASS_LI
MID_LO
D96AU435A
1/23
1 page  
TDA7437
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
SOFT MUTE
AMUTE Mute Attenuation
TDON
ON Delay Time
TDOFF
OFF Current
RINT
Pullup Resistor (pin 28)
VSMH
(pin 28) Level High
VSML
(pin 28) Level Low
BASS CONTROL
Crange
Control Range
Astep
Step Resolution
Rg Internal Feedback Resistance
MIDDLE CONTROL
Crange
Control Range
Astep
Step Resolution
Rg Internal Feedback Resistance
TREBLE CONTROL
CRANGE Control Range
Astep
Step Resolution
SPEAKER ATTENUATORS
CRANGE Control Range
Astep
Step Resolution
AMUTE Output Mute Attenuation
EA Attenuation Set Error
VDC DC Steps
AUDIO OUTPUT
Vclip Clipping Level
RL Output Load Resistance
RO Output Impedance
VDC DC Voltage Level
Test Condition
Min.
CCSM = 22nF; 0 to -20dB; I = IMAX
CCSM = 22nF; 0 to -20dB; I = IMIN
VCSM = 0V; I = IMAX
VCSM = 0V; I = IMIN
(note 2)
Soft Mute Active
50
0.8
25
20
3.5
±11.5
1
31
±11.5
1
17.5
±13
1
AV = 0 to -40dB
Data Word = 1111XXXX
AV = 0 to -40dB
Adjacent Attenuation Steps
d = 0.3%
0.5
80
2.1
2
50
3.5
Typ.
65
1.5
45
40
2
100
±14
2
44
±14
2
25
±14
2
79
1
100
0.1
2.6
90
3.8
Max.
2.0
60
60
1
±16
3
57
±16
3
32.5
±15
3
1.5
1.5
3
140
4.1
Unit
dB
ms
ms
µA
µA
KΩ
V
V
dB
dB
KΩ
dB
dB
KΩ
dB
dB
dB
dB
dB
dB
mV
Vrms
KΩ
Ω
V
5/23
5 Page 
Speaker
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
000
001
010
011
100
101
110
111
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1 1 1 1XXX
TDA7437
FUNCTION
1.25dB step
0dB
-1dB
-2dB
-3dB
-4dB
-5dB
-6dB
-7dB
0dB
-8dB
-16dB
-24dB
-32dB
-40dB
-48dB
-56dB
-64dB
-72dB
MUTE
11/23
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet TDA7437T.PDF ] | |
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