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SI4825 Datenblatt(PDF) 9 Page - Silicon Laboratories

Teilenummer SI4825
Bauteilbeschribung  Si4831/35/36/20/24/25-DEMO BOARD TEST PROCEDURE
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Hersteller  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
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SI4825 Datenblatt(HTML) 9 Page - Silicon Laboratories

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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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