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SI4831 датащи(PDF) 11 Page - Silicon Laboratories

номер детали SI4831
подробное описание детали  Si4831/35/36/20/24/25-DEMO BOARD TEST PROCEDURE
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производитель  SILABS [Silicon Laboratories]
домашняя страница  http://www.silabs.com
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AN569
Rev. 0.3
11
3.9. FM Tuning Indicator Sensitivity
3.9.1. Description
The test measures the needed RF input level to turn on the tuning indicator.
3.9.2. 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 = THD+N/SINAD.
i. Set Measurement Mode = SINAD.
ii. Set Unit = dB.
iii. Set Filter = A-weighting.
iv. Set Frequency Limit Low = 300 Hz.
v. Set Frequency Limit High = 15000 Hz.
4. Configure generator:
a. Set carrier frequency = 98 MHz.
b. Set RF level = 60 dBμV.
c. Select FM Modulation.
i. Set FM Deviation = 22.5 kHz.
ii. Set source = LFGEN.
iii. Set LFGEN frequency = 1 kHz.
d. Enable modulation.
e. Enable carrier.
5. Decrease signal generator RF level until the tuning indicator turns off.
6. Increase signal generator RF level VRF0 from low to high until tuning indicator turns on.
7. FM tuning indicator sensitivity = VRF0.
3.9.3. Pass Criteria
FM tuning indicator sensitivity should be no more than 15 dBµV.


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