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Número de pieza | TDA7501 | |
Descripción | LINE-DRIVER FOR DIGITAL CARRADIO SIGNAL PROCESSOR | |
Fabricantes | ST Microelectronics | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de TDA7501 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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LINE-DRIVER FOR DIGITAL CARRADIO
SIGNAL PROCESSOR
INPUTS:
- QUASI DIFFERENTIAL STEREO INPUT
FOR CD
- DIFFERENTIAL STEREO INPUTS FOR
PHONE, NAVIGATION, FM, AM
- SINGLE-ENDED INPUT FOR CASSETTE
- FOUR INDEPENDENT INPUT MULTIPLEXER
AND GAIN STAGES
- ENVELOPE-DETECTOR FOR
AM-NOISEBLANKING
- MIXING OF PHONE AND NAVIGATION
- DC-CONNECTION TO DSP
- DUAL MPX INPUTS
OUTPUTS:
- 6 OUTPUT CHANNELS WITH INDEPENDENT
VOLUME CONTROL
- 4 MAIN OUTPUT CHANNELS WITHADDITIONAL
INPUT SELECTOR FOR PHONE AND/OR
NAVIGATIONOR CD
- OUTPUTS FOR UP TO 4V rms
- AC-CONNECTION FROM DSP
DIGITAL CONTROL:
- SPI-BUS OR I2C BUS INTERFACE
(SELECTABLE)
- DIRECT MUTE FOR THE OUTPUT STAGES
AND/OR HIGH IMPEDANCE MPX MUTE
BLOCK DIAGRAM
PRODUCT PREVIEW
TQFP44
DESCRIPTION
The Linedriver handles all analog input- and out-
put-signals for the Digital Carradio Signal Proces-
sor TDA7501. The device contains four inde-
pendent input multiplexers to select the sources
for the DSP’s four AD-converters. Four additional
gain stages allow an adaptation to run the ADCs
in best S/N condition.
The six outputs have independent volume stages
with a large dynamic range. Using a 12V-supply
the outputs are able to drive up to 4Vrms .
April 1999
This is preliminary information on a new product foreseen to be developed. Details are subject to change without notice.
1/18
1 page TDA7501
DESCRIPTION OF THE INPUT PART
On the input side, the DSPLD (see figure 1) con-
nects the external audio- and tuner-signals to the
four AD-converters of the Digital Carradio Signal
Processor TDA7500. The audio signals are ad-
justed by the input gain stage to the internal refer-
Figure 1. Input part.
ence signal with 2V rms referred to 4.15V (=V33
à 1.2575). The following CODEC-interface at-
tenuates the 2Vrms to 0.8Vrms referred to the
CODEC’s reference voltage of 1.65V which al-
lows a DC-coupling to the TDA7500.
Input Stages
The decive offers several input stages for the dif-
ferent signals which have to be handled by the
system. A quasi differential input (see figure 2)
can be used for (external) CD-changer. The two
mono differential inputs allow the connection of
Phone and Navigation (see figure 3) or it could be
used as fully differential stereo input. Additionally
a single-ended stereo input is available for Cas-
sette applications. The lower part of the input
section is dedicated to the tuner signals. Another
quasi differential input (see figure 4) is used to
connect AM and FM referred to the tuner refer-
ence (Tuner-). This concept supports also double
tuner systems. Also two seperate level inputs are
present which are followed by level-shifters to al-
low the use of the TDA7500’s ADCs. For AM
noise blanking an envelope-detector driven by
the AM-IF is also available.
5/18
5 Page TDA7501
SOFTWARE SPECIFICATION FOR BOTH MODES
Auto increment
If bit I in the subaddress byte is set to ”1”, the autoincrement of the subaddress is enabled.
Reset condition
A Power-On-Reset is invoked if the Supply-Voltage V dd is below than 3.5V. After POR the following
data is written automatically into the registers of all subaddresses :
MSB
LSB
11111110
Subaddresses
The programming after POR is marked bold-face
in the programming tables.
With this programming all the outputs are muted
to their corresponding reference voltages.
MSB
LSB
D7 D6 I D4 SA3 SA2 SA1 SA0
Name
0 0 0 0 Input selector 1L
0 0 0 1 Input selector 1R
0 0 1 0 Input selector 2L
0 0 1 1 Input selector 2R
0 1 0 0 Bypass selector
0 1 0 1 Configuration
0 1 1 0 Mode select
0 1 1 1 Output selector
1 0 0 0 Volume 1L
1 0 0 1 Volume 1R
1 0 1 0 Volume 2L
1 0 1 1 Volume 2R
1 1 0 0 Volume 3L
1 1 0 1 Volume 3R
0 Autoincrement mode off
1 Autoincrement mode on
00
0
must be ”0”
Input selector 1L..3R, bits D7 ..D3 (subaddresses 0..3)
MSB
LSB
D7 D6 D5 D4 D3 D2 D1 D0
0
1
0000
0001
0010
0011
0100
0101
0100
0111
1000
1001
1010
1011
1100
1101
1100
1111
mute
off
on
gain
15dB
14dB
13dB
12dB
11dB
10dB
9dB
8dB
7dB
6dB
5dB
4dB
3dB
2dB
1dB
0dB
Function
11/18
11 Page |
Páginas | Total 18 Páginas | |
PDF Descargar | [ Datasheet TDA7501.PDF ] |
Número de pieza | Descripción | Fabricantes |
TDA7500 | DIGITAL AM/FM SIGNAL PROCESSOR | ST Microelectronics |
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