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SI4827 Datasheet(PDF) 10 Page - Silicon Laboratories |
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SI4827 Datasheet(HTML) 10 Page - Silicon Laboratories |
10 / 42 page AN603 10 Rev. 0.3 11. Record the Audio Stereo Separation2 (dB) = abs (VAUDIOL2 – VAUDIOR2). 12. Audio Stereo Separation (dB) = minimum (Audio Stereo Separation1, Audio Stereo Separation2) 3.7.3. Pass Criteria FM Stereo separation should be greater than 32 dB. 3.8. FM Audio L/R Imbalance 3.8.1. Description The test measures the gain / level imbalance between L and R channels in stereo mode. 3.8.2. 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 FM Modulation. i. Set FM Deviation = 75 kHz. ii. Set RF level = 60 dBμV. iii. Set Source = LFGEN. iv. Set LFGEN Frequency = 1 kHz. d. Enable modulation. e. Enable carrier. 5. Left channel audio level (dBV) = VAUDIOL. 6. Right channel audio level (dBV) = VAUDIOR. 7. Audio L/R imbalance (dB) = abs (VAUDIOL – VAUDIOR). 3.8.3. Pass Criteria FM audio L/R imbalance should be no more than 1 dB. |
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