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TDA7501TR Arkusz danych(PDF) 11 Page - STMicroelectronics |
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TDA7501TR Arkusz danych(HTML) 11 Page - STMicroelectronics |
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11 / 29 page  TDA7501 Description of the input part 11/29 3.2 Dual MPX mode The TDA7501 is able to support a twin tuner concept via the Dual MPX Mode. In this configuration the FM pin and the AM-pin are acting as MPX1 and MPX2 inputs. The DC Voltage at the TUNER pin controls whether MPX1, both MPX signals or MXX2 is used to decode the stereo FM signal (see Figure 6 Please note that the thresholds have a hysteresis of 500mV. During this mode the high ohmic mute acts on both inputs in parallel. Furthermore, a background tuner on the internal AM path can be selected by software aswtching to one of the two MPX inputs. For the programming of the Dual MPX Mode see the programming section. Figure 7. Block diagram Dual MPX. 3.3 Additional quasi differential Input The TDA7501 can be programmed to additional quasi-differential input by rearranging the configuration of the navigation and AM level inputs. Since the AM level input becomes the 2nd differential input, the level shift function is not available. For the programming of the navigation/AM level input configuration see the programming section. Figure 8. Additional quasi differential input simplified 1 MPX2 (AM+) HIZ-MUTE HIZ-MUTE MPX1 (FM+) CTRL (TUNER-) 50K 50K 50K 15K 15K 15K 1 15K 15K 15K 1 WINDOW- COMPARATOR & LOGIC (D4/5) (D5/5) AM FM D00AU1202 - + - + 1 NAVI-/QDIFF1- AMLEVEL/QDIFF2- NAVI+/COM+ 100K 100K 68K 15K 15K 15K 1 15K 15K 15K 33K 1 D3/4 NAVI/QDIFF1 LEVEL/QDIFF2 D00AU1203 D3/4 - + - + |
Podobny numer części - TDA7501TR |
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Podobny opis - TDA7501TR |
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