參數(shù)資料
型號(hào): TDA7406T
廠商: STMICROELECTRONICS
元件分類: 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝: 10 X 10 MM, TQFP-44
文件頁(yè)數(shù): 16/49頁(yè)
文件大?。?/td> 830K
代理商: TDA7406T
23/49
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
()
----------------------------------------------------------------
s
;
110kH z
3 38 kHz
()
==
α190
V
o s ign al
() at1kHz
()
V
o sp u r io u s
() at4kHz
()
----------------------------------------------------------------
s
;
186kH z
5 38 kHz
()
==
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