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TDA7406T 데이터시트(PDF) 23 Page - STMicroelectronics

부품명 TDA7406T
상세설명  CAR RADIO SIGNAL PROCESSOR
PDF  49 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

TDA7406T 데이터시트(HTML) 23 Page - STMicroelectronics

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TDA7406T
Note 4. ACI (Adjacent Channel Interference)
measured with: 90% mono signal; 9% pilot signal; fm=1kHz; 1% spurious signal (fs = 110kHz or 186kHz, un-
modulated).
3.2 Dual MPX Usage
3.2.1 Feature Description
The TDA7406T is able to support a twin tuner concept via the Dual-MPX-Mode. The DC-Voltage at the CMPX-
pin controls whether one or both MPX-signals are used to decode the stereo FM-signal. Therefor two window-
comparators with a characteristic as shown in Figure 17 are implemented (Please note that the thresholds have
a hysteresis of 500mV).
In this mode the stereodecoder high impedance-mute mutes both inputs in parallel.
Figure 17. Block diagram Dual MPX
α114
V
o s ign al
() at1kHz
()
V
o sp u r io u s
() at4kHz
()
---------------------------------------------------------------- ƒ
s
;
110kH z
3 38 kHz
⋅
()
–
==
α190
V
o s ign al
() at1kHz
()
V
o sp u r io u s
() at4kHz
()
----------------------------------------------------------------
ƒ
s
;
186kH z
5 38 kHz
⋅
()
–
==



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