TDA7406T datasheet(23/49 Pages) STMICROELECTRONICS

23 / 49 page

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

o s ign al

() at1kHz

()

o sp u r io u s

() at4kHz

()

---------------------------------------------------------------- ƒ

;

110kH z

3 38 kHz

⋅

()

–

α190

o s ign al

() at1kHz

()

o sp u r io u s

() at4kHz

()

----------------------------------------------------------------

;

186kH z

5 38 kHz

⋅

()

–

TDA7406T 数据表(PDF) 23 Page - STMicroelectronics

TDA7406T 数据表(HTML) 23 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49

数据表下载