TDA7412 datasheet(37/56 Pages) STMICROELECTRONICS

Part #	TDA7412

Description	CARRADIO SIGNAL PROCESSOR

PDF	56 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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TDA7412

8.0 DUAL MPX USAGE

8.1 Feature Description

The A679 is able to support a twin tuner concept via the Dual-MPX-Mode. In this configuration the MPX-pin and

the MD2G-pin are acting as MPX1 and MPX2 inputs. The DC-Voltage at the MD2-pin controls whether one or

both MPX-signals are used to decode the stereo FM-signal. It is designed as a window-comparator with the

characteristic shown in Figure 1 (Please note that the thresholds have a hysteresis of 500mV).

In this mode the stereodecoder highohmic-mute mutes both inputs in parallel.

Figure 31.

8.2 Configuration

The Dual-MPX-Mode can be easily configured by setting bit 3 of subaddress 30 to LOW (see Byte 30 description

and Application Diagram of fig. 33).

CONTROL

CIRCUITRY

INGAIN

100K

40K

100K

3.5...11dB

step 2.5dB

MPX/

MPX1

D00AU1167

MD2G/

MPX2

MD2/

CONTROL

TDA7412 Datasheet(PDF) 37 Page - STMicroelectronics