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参数资料
| 型号： | TDA7444 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
| 封装： | DIP-28 |
| 文件页数： | 15/18页 |
| 文件大小： | 211K |
| 代理商： | TDA7444 |
DATA INTERFACE
Digital and Analog interfaces
As shown in Fig. 2, the data interface is com-
posed of analog and digital inputs and outputs.
There is one stereo analog input and one stereo
digital input. These two stereo inputs can come
from different sources, an internal switch matrix
allows to choose the desired input using an I2C
control word.
There are two stereo analog outputs and one ste-
reo digital output. The digital outputs are the copy
of the analog right and left data or center and sur-
round data.
Data interface
The digital data can be exchanged using a serial
interface which can be master or slave and allow
different protocol formats (see fig. 3 serial for-
mats), the data interface parameters can be set
using an I2C control word.
The data are 16 bit wide.
The signals of this interface are:
MCLK, the master clock which is 256 fs is
used by the DAC and ADC.
SCLK, the serial bit clock which can be either
32fs (master or slave) or 64 fs (only master).
ANALOG RIGHT
ANALOG LEFT
ANALOG CENTER
ANALOG SURROUND
DIGITAL RIGHT OR CENTER
DIGITAL LEFT OR SURROUND
ANALOG RIGHT
ANALOG LEFT
DIGITAL RIGHT
DIGITAL LEFT
D98AU930B
Figure 2. Data Interfaces.
C1 0.47
F
C6
0.47
F
C2 10
F
C3
0.1
F
C4
10
F
C7 0.47
F
AOUT1L
1
VREF2
2
VREF1
3
AINR
4
AINL
5
6
VDDA1
7
VSSA1
ANALOG POWER 1
C8
10
F
C9
100nF
27
MHz
R1
22K
C10 27pF
C11 27pF
8
9
XTI
XTO
C12
100nF
10
11
VSSA2
VDDA2
ANALOG POWER 2
C20 0.47
F
AOUT1R
28
C19 10
F
VREF3
27
A GND 1
C18
0.1
F
C5
0.1
F
A GND 1
C17 0.47
F
AOUT2L
26
C16 0.47
F
AOUT2R
25
CENTER
SURROUND
RIGHT
LEFT
C15
100nF
24
VDD1
VSS1
23
ANALOG POWER 1
MCLK
22
SCLK
21
SDIN
20
SDOUT
19
LR
18
I2S
INTERFACE
SDA
17
SCL
16
VSS3
15
I2C INTERFACE
VDD3
14
C14 100nF
DIGITAL POWER 3
LM317L
D98AU928B
C21
100
F
C22
0.1
F
C24
1
F
+VS=6V
GND
VDDA1 (4)
VDDA2 (5)
VSSA1
VSSA2
(1)
C23
10
F
R5
240
R4
390
R2
4.7K
R3
4.7K
VDD
VDD2
13
VSS2
12
C13 100nF
DIGITAL POWER 2
(4)
(5)
(2)
(3)
LM317L
C25
0.1
F
C28
1
F
VDD2(2)
VDD1(1)
VDD3(3)
VSS1
VSS2
VSS3
C26
10
F
R7
240
R6
390
U1
U2
U3
L1
Figure 1. Test and Application Circuit.
TDA7444 - TDA7444D
6/18
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