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SI4840 Arkusz danych(PDF) 8 Page - Silicon Laboratories

Numer części SI4840
Szczegółowy opis  Si4822/26/27/40/44-DEMO BOARD TEST PROCEDURE
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AN603
8
Rev. 0.3
3.6. FM Audio Frequency Response
3.6.1. Description
Audio frequency response is the measure of linearity of output voltage vs. modulation frequency across the audio
band.
3.6.2. 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 = 10.5 kHz.
ii. Set L = R.
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. Audio 1 kHz level (dBV) = V1 kHz.
6. Configure audio analyzer frequency mode through RMS Select Function.* Set Frequency Mode = FIX:
30 Hz.
7. Configure generator LFGEN Frequency = 30 Hz.
8. Audio 30 Hz level (dBV) = V30 Hz.
9. Configure audio analyzer frequency mode through RMS Select Function. Set Frequency Mode = FIX:
15 kHz.
10. Configure generator LFGEN Frequency = 15 kHz.
11. Audio 15 kHz level (dBV) = V15 kHz.
12. Audio frequency response (dB) equals the greater magnitude of (V30 Hz – V1 kHz) and (V15 kHz –
V1 kHz).
Note:
If you test the band with de-emphasis 50 μs, you should set pre-emphasis = 50 μs.
3.6.3. Pass Criteria
The greater magnitude of (V30 Hz – V1 kHz) and (V15 kHz – V1 kHz) should be no more than 3 dB.


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