參數(shù)資料
型號: TDA7412
廠商: STMICROELECTRONICS
元件分類: 音頻控制
英文描述: 1 CHANNEL(S), TONE CONTROL CIRCUIT, PQFP44
封裝: 10 X 10 MM, 1.40 MM HEIGHT, TQFP-44
文件頁數(shù): 31/56頁
文件大?。?/td> 716K
代理商: TDA7412
37/56
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
1
MD2G/
MPX2
MD2/
CONTROL
1
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