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TDA7420 Datasheet(PDF) 11 Page - STMicroelectronics

Part # TDA7420
Description  MULTIFUNCTIONAUDIO PROCESSOR
PDF  29 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7420 Datasheet(HTML) 11 Page - STMicroelectronics

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80KHz LP
SIGNAL PATH
ATC
AUTOMATIC
THRESHOLD
CONTROL
PEAK+VTH
RECT-PEAK
BUF
PEAK
AMP
RECT
-
+
PEAK COMP
REF.
BLANK COMP
1
4
5
I
2
C-BUS
ADDITIONAL THRESHOLD
CONTROL
(ATC-SB, MPX_RECT)
40
µs
LEFT
RIGHT
to INPUT SELECTOR
of AUDIOPROC.
CMOS OUTPUT
STAGE
MPX IN
VR
VSB
CPEAK
47nF
RPEAK
82K
Ω
CBLANK
330pF
TRIGGER
OUT
40
µs
D94AU189A
Figure 1: Block Diagram of the Noise Blanker
65mV
30mV
8 STEPS
NOISE ADJUSTED
TRIG. THRESHOLD
TRIG. THRESHOLD
280mV
240mV
180mV
140mV
0.9V
VTH
1.4V
VPEAK(V)
D94AU186B
Figure 2: Trigger Threshold vs. Vpeak
TDA7420
11/29



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