TDA7406T View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TDA7406T' PDF : 49 Pages View PDF
TDA7406T
Note 4. ACI (Adjacent Channel Interference)
α114 = -V----Vo---(-o-s--(--ps----ui-g---r-n-i--o-a---u-l--)s--(--)-a-(---at--1-t--4k----Hk----H-z---)-z---) ;ƒs = 110kH z – (3 ⋅ 38 kHz )
α190 = -V----Vo---(-o-s--(--ps----ui-g---r-n-i--o-a---u-l--)s--(--)-a-(---at--1-t--4k----Hk----H-z---)-z---) ;ƒs = 186kH z – (5 ⋅ 38 kHz )
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
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