Moteur de recherche de fiches techniques de composants électroniques |
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SI4825 Fiches technique(PDF) 6 Page - Silicon Laboratories |
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SI4825 Fiches technique(HTML) 6 Page - Silicon Laboratories |
6 / 40 page AN569 6 Rev. 0.3 3.4. FM Selectivity –3 dB 3.4.1. Description The test measures the FM frequency offset range to the tuned station when output audio level drops by 3 dB. 3.4.2. Conditions/Procedure 1. Connect test equipment as shown in Figure 1. 2. Configure the tuner in standard configuration. 3. Configure the audio analyzer: a. Select Analyze. b. Set Function = THD+N/SINAD. i. Set Measurement Mode = SINAD. ii. Set Unit = dB. iii. Set Filter = A-weighting. iv. Set Frequency Limit Low = 300 Hz. v. Set Frequency Limit High = 15000 Hz. 4. Configure generator: a. Set carrier frequency = 98 MHz. b. Set RF level = 40 dBμV. c. Select FM Modulation. i. Set FM Deviation = 22.5 kHz. ii. Set Source = LFGEN. iii. Set LFGEN frequency = 1 kHz. d. Enable modulation. e. Enable carrier. 5. Record the audio output level (dBV) = VAUDIO0. 6. Raise the signal generator RF frequency Fh, until audio output level VAUDIO1 = VAUDIO0–3. 7. Lower the signal generator RF frequency Fl, until audio output level VAUDIO1 = VAUDIO0–3. 8. Selectivity –3 dB (kHz) = Fh – Fl. 3.4.3. Pass Criteria FM Selectivity for –3dB audio level difference should be between 40 kHz and 100 kHz. |
Numéro de pièce similaire - SI4825 |
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Description similaire - SI4825 |
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