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SI4844 データシート(PDF) 10 Page - Silicon Laboratories

部品番号 SI4844
部品情報  Si4822/26/27/40/44-DEMO BOARD TEST PROCEDURE
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メーカー  SILABS [Silicon Laboratories]
ホームページ  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI4844 データシート(HTML) 10 Page - Silicon Laboratories

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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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