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SI4835 Datasheet(PDF) 9 Page - Silicon Laboratories |
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SI4835 Datasheet(HTML) 9 Page - Silicon Laboratories |
9 / 40 page AN569 Rev. 0.3 9 3.7. FM Stereo Separation 3.7.1. Description The test quantifies leakage or crosstalk from one channel to another in stereo mode. 3.7.2. 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 = 67.5 kHz. ii. Set L = 1, R = 0. 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. Left channel audio level (dBV) = VAUDIOL1. 6. Right channel audio level (dBV) = VAUDIOR1. 7. Record the Audio Stereo Separation1 (dB) = abs (VAUDIOL1 – VAUDIOR1). 8. Configure generator: a. Set carrier frequency = 98 MHz. b. Set RF level = 60 dBμV. c. Select Stereo Modulation. i. Set FM Deviation = 67.5 kHz. ii. Set L = 0, R = 1. 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. 9. Left channel audio level (dBV) = VAUDIOL2. 10. Right channel audio level (dBV) = VAUDIOR2. |
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