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TDA7340G bảng dữ liệu(PDF) 16 Page - STMicroelectronics

tên linh kiện TDA7340G
Giải thích chi tiết về linh kiện  AUDIO SIGNAL PROCESSOR
PDF  27 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7340G bảng dữ liệu(HTML) 16 Page - STMicroelectronics

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VOLUME
MSB
LSB
FUNCTION
D7
D6
D5
D4
D3
D2
D1
D0
0.31dB FINE ATTENUATION STEPS
00
0
0
1
-0.31dB
1
0
-0.62dB
1
1
-0.94dB
1.25dB COARSE ATTENUATION STEPS
000
0dB
0
0
1
-1.25dB
0
1
0
-2.5dB
0
1
1
-3.75dB
1
0
0
-5dB
1
0
1
-6.25dB
1
1
0
-7.5dB
1
1
1
-8.75dB
10dB GAIN ATTENUATION STEPS
0
0
0
20dB
0
0
1
10dB
010
0dB
0
1
1
-10dB
1
0
0
-20dB
1
0
1
-30dB
1
1
0
-40dB
1
1
1
-50dB
For example to select -47.81dB Volume the Data Byte is: 11011001
STATUS AFTER POWER ON RESET
VOLUME
-59.69dB
BASS, TREBLE
Treble = +2dB, Bass = 0dB, symmetrical
SPKRS LF, RF, LR, RR
-37.5dB
LOUDNESS
OFF , -17.5dB
INPUT
No input selected, GAIN = 0dB, DIFF CD GAIN = -06dB, FULLY DIFF MODE
STEREODEC
OFF , FORCED MONO, 6dB GAIN, PILOT THRESHOLD LOW, NOISE BLANKER =11
MUTE
DIRECTLY MUTED, SOFT OFF, ZEROCROSS RESET, WINDOW THRESHOLD =11
NOISE BLANKER
NTB = 11, NAT = 11, OVD = OFF, FSC OFF, BLEND MODE OFF, INTERNAL MPX
PATH ENABLED
DESCRIPTION OF THE NOISE BLANKER
In the normal automotive environment the MPX
signal is disturbed by ignition spikes, motors and
high frequency switches etc.
The aim of the noise blanker part is to cancel the
influence of the spikes produced by these compo-
nents. Therefore the output of the stereodecoder
is switched off for a time of 40
µs (average spike
duration).
In a first stage the spikes must be detected but to
avoid a wrong triggering on high frequency noise
a complex trigger control is implemented.
Behind the trigger stage a pulse former generates
the 40
µs ”blanking” pulse.
In the following section all of these circuits are de-
scribed in their function and their programming,
too (see fig.4).
TDA7340G
16/27



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