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PDF TDA7467 Data sheet ( Hoja de datos )
| Número de pieza | TDA7467 | |
| Descripción | AUDIO MATRIX WITH SRS EFFECTS | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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TDA7467
AUDIO MATRIX WITH SRS EFFECTS
The Device incorporates the SRS
(Sound Retrieval System) under
licence from SRS Labs, Inc.
1 STEREO INPUT
INPUT ATTENUATION CONTROL IN 0.5dB
STEP
- MUTE FUNCTION
MONO MODE (SRS 3D MONO)
STEREO MODE (SRS 3D STEREO)
SPACE AND CENTER ATTENUATORS ARE
AVAILABLE
ALL FUNCTION ARE PROGRAMMABLE VIA
SERIAL BUS (I2C BUS)
DESCRIPTION
The TDA7467 is a SRS (Sound Retrieval System)
audio matrix. It reproduces SRS sound process-
ing stereo and mono sources both.
The SRS sound is guaranteed by external com-
ponents and it is not affected by internal process
spreads.
The AC signal setting is obtained by resistor net-
works and switches combined with operational
amplifiers according to the SRS labs specifica-
PIN CONNECTION (Top view)
DIP28
ORDERING NUMBER: TDA7467
SO28
ORDERING NUMBER: TDA7467D
tion.
Control of all the functions is accomplished by serial
bus. Thanks to the used BIPOLAR/CMOS/DMOS
technology, Low Distortion, Low Noise and DC
stepping are obtained.
May 1997
LOUT
RIN
LIN
DIG_GND
SCL
ADDR
SDA
AGND
PS1
PS2
PS3
PS4
PS5
PS6
1 28
2 27
3 26
4 25
5 24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
D96AU507
ROUT
CREF
LP2
LP1
HP6
HP5
HP4
VS
HP3
HP2
HP1
VREFOUT
NETW2
NETW1
1/11
1 page  
TDA7467
I2C BUS INTERFACE
Data transmission from microprocessor to the
TDA7467 and viceversa takes place through the
2 wires I2C BUS interface, consisting of the two
lines SDA and SCL (pull-up resistors to positive
supply voltage must be connected).
Data Validity
As shown in fig. 3, the data on the SDA line must
be stable during the high period of the clock. The
HIGH and LOW state of the data line can only
change when the clock signal on the SCL line is
LOW.
Start and Stop Conditions
As shown in fig.4 a start condition is a HIGH to
LOW transition of the SDA line while SCL is
HIGH. The stop condition is a LOW to HIGH tran-
sition of the SDA line while SCL is HIGH.
Byte Format
Every byte transferred on the SDA line must con-
tain 8 bits. Each byte must be followed by an ac-
Figure 3: Data Validity on the I2CBUS
knowledge bit. The MSB is transferred first.
Acknowledge
The master (µP) puts a resistive HIGH level on the
SDA line during the acknowledge clock pulse (see
fig. 5). The peripheral (audioprocessor) that ac-
knowledges has to pull-down (LOW) the SDA line
during this clock pulse.
The audioprocessor which has been addressed
has to generate an acknowledge after the recep-
tion of each byte, otherwise the SDA line remains
at the HIGH level during the ninth clock pulse
time. In this case the master transmitter can gen-
erate the STOP information in order to abort the
transfer.
Transmission without Acknowledge
Avoiding to detect the acknowledge of the audio-
processor, the µP can use a simpler transmission:
simply it waits one clock without checking the
slave acknowledging, and sends the new data.
This approach of course is less protected from
misworking.
Figure 4: Timing Diagram of I2CBUS
Figure 5: Acknowledge on the I2CBUS
5/11
5 Page 
TDA7467
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specification mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as criticalcomponents in life support devices or systems without express
written approval of SGS-THOMSON Microelectronics.
© 1997 SGS-THOMSON Microelectronics – Printedin Italy – All RightsReserved
The SoundRetrieval System and
are registered trademarks of SRS Labs, Inc.
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - Canada - China - France - Germany - HongKong - Italy- Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore- Spain - Sweden - Switzerland - Taiwan- Thailand - United Kingdom- U.S.A.
11/11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet TDA7467.PDF ] | |
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