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參數(shù)資料
| 型號(hào)： | TDA7319 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 3 Band Digital Controlled Audio Processor(三波段數(shù)控音頻處理器) |
| 中文描述： | 3波段數(shù)字控制音頻處理器（三波段數(shù)控音頻處理器） |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 169K |
| 代理商： | TDA7319 |
ELECTRICALCHARACTERISTICS
(continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
GENERAL
e
NO
E
t
Output Noise
Total Tracking Error
All Gains 0dB (B= 20to20kHz flat)
A
V
= 0 to -24dB
A
V
= -24 to -47dB
All Gains = 0dB; V
O
= 1V
rms
5
0
0
15
1
2
μ
V
dB
dB
dB
dB
%
S/N
S
C
d
Signal to Noise Ratio
Channel Separation
Distortion
106
100
0.01
80
A
V
= 0; V
in
= 1V
rms
0.08
BUS INPUTS
V
il
V
ih
I
in
V
O
Input Low Voltage
Input High Voltage
Input Current
Output Voltage SDA
Acknowledge
1
V
V
μ
A
V
3
-5
V
in
= 0.4V
I
O
= 1.6mA
5
0.4
0.8
Note 1: the device is functionally good at Vs =5V. A step down, on V
S
, to 4V does’t reset the device.
APPLICATION SUGGESTIONS
The first and the last stages are volume control
blocks. The control range is 0 to -47dB (mute)
with a 1dB step.
The very high resolution allows the implementation
of systems freefrom any noisyacousticaleffect.
The TDA7319 audioprocessor provides 3 bands
tones control.
Bass, Middle Stages
The Bass and the middle cells have the same
structure.
The Bass cell has an internal resistor Ri = 44K
typical.
The Middle cell has an internal resistor Ri = 25K
typical.
Several filter types can be implemented, connect-
ing external components to the Bass/Middle IN
and OUTpins.
The fig.1 refers to basic T Type Bandpass Filter
starting from the filter component values (R1 in-
ternal and R2,C1,C2 external) the centre fre-
quency Fc, the gain Av at max. boost and the fil-
ter Q factor are computedas follows:
F
C
=
1
2
π
√
A
V
=
R2 C2
+
R2 C1
+
RiC1
R2 C1
+
R2 C2
Q
=
√
+
R2 C1
+
R2 C2
C1 C2
Viceversa, once Fc, Av, and Ri internal value are
fixed, the external components values will be:
C1
=
A
V
1
2
π
R
i
Q
C2
=
Q
2
C1
A
V
1 Q
2
R2
=
A
V
1
Q
2
2
π
C1
F
C
(
A
V
1
)
Q
Treble Stage
The treble stage is a high pass filter whose time
constant is fixed by an internal resistor (25K
typical) and an external capacitor connected be-
tweentreble pinsand ground
Typical responsesare reportedin Figg. 10 to 13.
CREF
The suggested 10
μ
F reference capacitor (CREF)
value can be reduced to 4.7
μ
F if the application
requiresfaster power ON.
Ri internal
C
2
OUT
IN
C
1
R
2
D95AU313
Figure1.
TDA7319
4/16
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