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AN569 Datasheet(PDF) 8 Page - Silicon Laboratories |
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AN569 Datasheet(HTML) 8 Page - Silicon Laboratories |
8 / 40 page AN569 8 Rev. 0.3 3.6. FM Audio Frequency Response 3.6.1. Description Audio frequency response is the measure of linearity of output voltage vs. modulation frequency across the audio band. 3.6.2. 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 = RMS Select. i. Set Bandwidth = BP 3%. ii. Set Units = dBV. iii. Set Frequency Mode = FIX: 1 kHz. 4. Configure generator: a. Set carrier frequency = 98 MHz. b. Set RF level = 60 dBμV. c. Select Stereo Modulation. i. Set FM Deviation = 10.5 kHz. ii. Set L = R. iii. Set Source = LFGEN. iv. Set LFGEN frequency = 1 kHz. v. Set Pre-emphasis = 75 μs. vi. Set Pilot = ON. vii. Set Pilot Deviation = 6.75 kHz. d. Enable modulation. e. Enable carrier. 5. Audio 1 kHz level (dBV) = V1 kHz. 6. Configure audio analyzer frequency mode through RMS Select Function. Set Frequency Mode = FIX: 30 Hz. 7. Configure generator LFGEN frequency = 30 Hz. 8. Audio 30 Hz level (dBV) = V30 Hz. 9. Configure audio analyzer frequency mode through RMS Select Function. Set Frequency Mode = FIX: 15 kHz. 10. Configure generator LFGEN frequency = 15 kHz. 11. Audio 15 kHz level (dBV) = V15 kHz. 12. Audio frequency response (dB) equals the greater magnitude of (V30 Hz – V1 kHz) and (V15 kHz – V1 kHz). Note: If you test the band with De-emphasis 50 μs, you should Set Pre-emphasis = 50 μs. 3.6.3. Pass Criteria The greater magnitude of (V30 Hz – V1 kHz) and (V15 kHz – V1 kHz) should be no more than 3 dB. |
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