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TDA7421 Scheda tecnica(PDF) 9 Page - STMicroelectronics |
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TDA7421 Scheda tecnica(HTML) 9 Page - STMicroelectronics |
9 / 38 page ELECTRICAL CHARACTERISTICS (continued) Detuning Detector Ref: FM Test Circuit, measure: - Inputs at VFMLIMIN, CW - output at VMUTE,DRIVE Symbol Parameter Test Condition Min. Typ. Max. Unit DDSTART Detuning Detector Starting Point frequency shift from 10.7MHz at which VMUTE,DRIVE = VPLAY ±23 KHz DDSLOPE,MIN Detuning Detector Minimum Muting Slope frequency shift from 10.7MHz + DDSTART, at which VMUTE,DRIVE = VMUTE, BWM2-0 set to 100, FMRECSEEK set to 0 22.5 30 37.5 KHz DDSLOPE,MAX Detuning Detector Maximum Muting Slope frequency shift from 10.7MHz + DDSTART, at which VMUTE,DRIVE = VMUTE, BWM2-0 set to 001, FMRECSEEK set to 0 7.5 10 12.5 KHz DDTRC Detuning Detector Time Constant Ratio ratio of "reception" mode integration time constant inside the Detuning Detector with respect to "seek" mode 34/6 s/s Adjacent Channel Detector Ref: FM Test Circuit, measure: - Inputs at VFMLIMIN: desired 10.7MHz, 95dBu CW; undesired 10.8MHz CW - output at VMUTE,DRIVE - BWM2-0 set to 001 Symbol Parameter Test Condition Min. Typ. Max. Unit ACDMAX Adjacent Channel Quality Detector Maximum Sensitivity Threshold amplitude of undesired signal at which VMUTE,DRIVE = VMUTE, HDM4-0 set to 11111 91 dBu ACDMIN Adjacent Channel Quality Detector Minimum Sensitivity Threshold amplitude of undesired signal at which VMUTE,DRIVE = VMUTE, HDM4-0 set to 00000 94.8 dBu Field Strength Station Detector Ref: FM Test Circuit, measure: - Inputs at VFMLIMIN: desired 10.7MHz, CW - output at VFMSD - FMRECSEEK set to 1 Symbol Parameter Test Condition Min. Typ. Max. Unit FSSDMIN Field Strength Station Detector Minimum Threshold VFMLIMIN level at which VFMSD = 2.5, FSM4-0 set to 00000 24 dBu FSSDMAX Field Strength Station Detector Maximum Threshold VFMLIMIN level at which VFMSD = 2.5, FSM4-0 set to 11111 76 dBu Detuning Station Detector Ref: FM Test Circuit, measure: - Input at VFMLIMIN, CW; - output at VFMSD - FMRECSEEK set to 1 Symbol Parameter Test Condition Min. Typ. Max. Unit DSD Detuning Station Detector Threshold frequency shift from 10.7MHz at which VFMSD = 2.5V 23 KHz TDA7421 9/38 |
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