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PDF 6764 Data sheet ( Hoja de datos )
| Número de pieza | 6764 | |
| Descripción | AUDIO SIGNAL PROCESSOR | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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® TDA7340G
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:
ROLL-OFF ADJUSTMENT
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
DEVIATION AND FIELD STRENGTH DE-
PENDENT TRIGGER ADJUSTMENT
PAUSE DETECTOR:
PROGRAMMABLE THRESHOLD
ALLFUNCTIONS PROGRAMMABLEVIA I2C BUS
DESCRIPTION
The TDA7340G I2C bus controlled audio signal
processor contains all signal processing blocks of
PQFP44
ORDERING NUMBER: TDA7340G
a high performance car radio, including audio-
processor, stereodecoder, noise blanker, pause
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 pilot cancellation.
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
1/27
1 page  
TDA7340G
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
ASTEPC
Max Attenuation
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
tD
Mute Attenuation
Delay Time
CEXT = 22nF;
0 to -20dB;
I = IMAX
I = IMIN
45
0.8
15
SOFT MUTE AT PHONE-GND
Vil Input Low Voltage
(1) WIN represents the MUTE programming bit pair D6,D5 for the zero crossing window threshold
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
1.4
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
1.6
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
V
5/27
5 Page 
TDA7340G
SUBADDRESS (RECEIVE MODE)
MSB
X
X
T = Testmode
T I A3 A2 A1
000
000
001
001
010
010
011
011
100
100
I = Autoincrement X = Not Used
LSB
A0
0
1
0
1
0
1
0
1
0
1
FUNCTION
Input Selector
Loudness
Volume
Bass, Treble
Speaker Attenuator LF
Speaker Attenuator LR
Speaker Attenuator RF
Speaker Attenuator RR
Mute
Stereodecoder
TRANSMITTED DATA (SEND MODE)
MSB
LSB
X X X X ST SM ZM P
P = Pause (low active)
ZM =Zero Crossing Muted (HIGH = active)
SM = Soft mute activated (HIGH = active)
DATA BYTE SPECIFICATION
X = not relevant; set to ”1”during testing
INPUT SELECTOR
ST = Stereo (HIGH = active)
X = Not used
The transmitted data is automatically updated af-
ter each 9th clock pulse.
Transmission can be repeated without new chi-
paddress.
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
FUNCTION
0 0 0 0 Quasi Diff CD
1 0 0 0 Full Diff CD
0 0 1 Stereo Decoder
0 1 0 Cassette Stereo
0 0 1 1 AM Mono
1 0 0 Telephone Mono
0 1 0 1 Beep Mono
1 0 1 1 AM Stereo
1 0 1 Not allowed
1 1 0 Not allowed
1 1 1 Not allowed
00
11.25dB gain
01
7.5dB Gain
10
3.75dB Gain
11
0 dB Gain
0 0dB Differential input Gain (CD Input)
1 -6dB Differential input Gain (CD Input)
For example to select quasi diff CD input with a gain of 7.5dB the Data Byte is: XXX01000
11/27
11 Page | ||
| Páginas | Total 27 Páginas | |
| PDF Descargar | [ Datasheet 6764.PDF ] | |
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