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PDF TDA7340 Data sheet ( Hoja de datos )
| Número de pieza | TDA7340 | |
| Descripción | AUDIO SIGNAL PROCESSOR | |
| Fabricantes | ST Microelectronics | |
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® TDA7340
AUDIO SIGNAL PROCESSOR
AUDIOPROCESSOR:
MUTE, SOFT MUTE AND ZERO CROSSING
MUTE
ONE DIFFERENTIAL, TWO STEREO AND
TWO MONO INPUTS
DIFFERENTIAL PHONE INPUT
VOLUME, BASS, TREBLE AND LOUDNESS
CONTROL
FOUR SPEAKER ATTENUATORS WITH IN-
DEPENDENT ATTENUATION CONTROL
STEREODECODER:
ADJUSTMENT FREE INTEGRATED 456KHz
VCO
HIGH CUT CONTROL
STEREO BLEND
NOISE BLANKER:
INTEGRATED HIGH-PASS FILTER
NOISE RECTIFIER OUTPUT FOR QUALITY
DETECTION
PROGRAMMABLE TRIGGER THRESHOLD
PAUSE DETECTOR:
PROGRAMMABLE THRESHOLD
ALLFUNCTIONS PROGRAMMABLEVIA I2C BUS
DESCRIPTION
The TDA7340 I2C bus controlled audio signal
processor contains all signal processing blocks of
a high performance car radio, including audio-
processor, stereodecoder, noise blanker, pause
PQFP44
ORDERING NUMBER: TDA7340P
detector and different mute functions.
The use of BICMOS technology allows the imple-
mentation of several filter functions with switched
capacitor techniques like fully integrated, adjust-
ment free PLL Loop filter, pilot detector with inte-
grator and two 19KHz notch filters.
This minimizes the number of external compo-
nents.
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 also in the stereodecoder
part. The audioprocessor contains several new
features like softmute, zero-crossing mute and
pause detector.
Very low Dc stepping is obtained by use of a
BICMOS technology.
September 1999
1/16
1 page  
TDA7340
ELECTRICAL CHARACTERISTICS (continued.)
Symbol
Parameter
Test Condition
Min.
DIFFERENTIAL CD STEREO INPUT
RI Input Resistance
CMRR Common Mode Rejection Ratio
d
eIN
GDIFF
Distortion
Input Noise
Differential Gain
Input selector BIT D6 = 0 (0dB)
Input selector BIT D6 = 1(-6dB)
VCM = 1VRMS ;
f = 1KHz
f = 10KHz
VI = 1VRMS
20Hz to 20KHz; Flat; D6 = 0
D6 = 0
D6 = 1
10
14
48
45
-1
-7
DIFFERENTIAL TELEPHONE MONO INPUT
RI Input Resistance
CMRR Common Mode Rejection Ratio VCM = 1VRMS ; f = 1KHz
d Distortion
VI = 1VRMS
eIN Input Noise
20Hz to 3 KHz; Flat
GDIFF
Differential Gain
14
45
-4.75
VOLUME CONTROL
RI Input Resistance (INR, INL)
CMAX
Max Gain
AMAX
Max Attenuation
ASTEPC
Step Resolution Coarse
Attenuation
ASTEPF
Step Resolution Fine
Attenuation
EA Attenuation Set Error
ET Tracking Error
VDC DC Steps
G = -20 to 20dB
G = -20 to -59.7dB
Adjacent Attenuation Steps
from 0dB to AMAX
24
18.75
57.7
0.50
0.11
-1.25
3
-3
LOUDNESS CONTROL (LOUDL, LOUDR)
RI Internal Resistance
ASTEP
Step Resolution
AMAX
Max Attenuation
35
0.5
17.5
ZERO CROSSING MUTE
VTH Zero Crossing Threshold (1)
AMUTE
VDC
Mute Attenuation
DC Step
WIN = 11
WIN = 10
WIN = 01
WIN = 00
0dB to Mute
80
SOFT MUTE
AMUTE
Mute Attenuation
tD Delay Time
CEXT = 22nF;
0 to -20dB;
I = IMAX
I = IMIN
45
0.8
15
Typ.
15
20
75
70
0.01
5
0
-6
20
60
0.15
10
-3.75
35
20
59.7
1.25
0.31
0
0.1
0.5
50
1.25
18.75
20
40
80
160
100
0.3
60
1.5
25
Max.
20
30
0.08
1
-5
26
0.5
-2.75
46
21.25
62.7
2.00
0.51
1.25
2
2
3
5
65
2.0
20.0
3
2.0
45
(1) WIN represents the MUTE programming bit pair D6,D5 for the zero crossing window threshold
Unit
KΩ
KΩ
dB
dB
%
µV
dB
dB
KΩ
dB
%
µV
dB
KΩ
dB
dB
dB
dB
dB
dB
dB
mV
mV
KΩ
dB
dB
mV
mV
mV
mV
dB
mV
dB
ms
ms
5/16
5 Page 
TDA7340
LOUDNESS
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
LOUDNESS
X X X 0 0 0 0 0 0dB
X X X 0 0 0 0 1 -1.25dB
X X X 0 0 0 1 0 -2.5dB
X X X 0 0 0 1 1 -3.75dB
X X X 0 0 1 0 0 -5dB
X X X 0 0 1 0 1 -6.25dB
X X X 0 0 1 1 0 -7.5dB
X X X 0 0 1 1 1 -8.75dB
X X X 0 1 0 0 0 -10dB
X X X 0 1 0 0 1 -11.25dB
X X X 0 1 0 1 0 -12.5dB
X X X 0 1 0 1 1 -13.75dB
X X X 0 1 1 0 0 -15dB
X X X 0 1 1 0 1 -16.25dB
X X X 0 1 1 1 0 -17.5dB
X X X 0 1 1 1 1 -18.75dB
X X X 1 D3 D2 D1 D0 loudness OFF (1)
For example to select -17.5dB loudness the Data Byte is: XXX01110
Note (1):
If the loudness is switched OFF, the loudness stage is acting like a volume attenuator with flat frequency response. D0 to D3 determine the
attenuation level.
MUTE
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
FUNCTION
1 Soft Mute On
0 1 Soft Mute with fast slope (I = IMAX)
1 1 Soft Mute with slow slope (I = IMIN)
1 Direct Mute
01
Zero Crossing Mute ON
00
ZC Mute OFF (delayed until next zero crossing)
1 Zero Crossing Mute and Pause Detector Reset
00
160mV ZC Window Threshold (WIN = 00)
01
80mV ZC Window Threshold (WIN = 01)
10
40mV ZC Window Threshold (WIN = 10)
11
20mV ZC Window Threshold (WIN = 11)
0 Nonsymmetrical Bass Cut
1 Symmetrical Bass Cut
An additional direct mute function is included in the Speaker Attenuators
11/16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TDA7340.PDF ] | |
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