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SI4710 Datasheet(PDF) 35 Page - Silicon Laboratories |
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SI4710 Datasheet(HTML) 35 Page - Silicon Laboratories |
35 / 68 page AN388 Rev. 0.2 35 3.2.4. Output Voltage Higher audio output voltage is an indicator of cleaner sound from the tuner. It is measured as an RMS value under standard operating conditions. 1. Connect test equipment as shown in Figure 6 or Figure 7. 2. Configure the tuner: a. Set frequency = 1 MHz. (10 MHz for shortwave and 216 kHz for longwave.) b. Set volume = 63. 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 #1: a. Set carrier frequency = 1 MHz. (10 MHz for shortwave and 216 kHz for longwave.) b. Select AM Modulation. i. Set AM Modulation Depth = 30%. ii. Set Source = LFGEN. iii. Set LFGEN frequency = 1 kHz. c. Set RF level = 74 dBµV. d. Enable AM modulation. e. Enable RF (carrier). 5. Disable generator #2. 6. Record audio level (mVrms) from the analyzer. |
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