AN603 Datasheet, PDF (16/42 Pages) Silicon Laboratories – Si4822/26/27/40/44-DEMO BOARD TEST PROCEDURE

AN603
3.14. FM Audio Output Voltage
3.14.1. Description
The test measures FM Audio Volume Level at an RF Level of 60 dBμVemf.
3.14.2. 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. Test the audio voltage at FM tuner audio output pin LOUT or ROUT.
3.14.3. Pass Criteria
FM audio output voltage level should range from 72 to 90 mVrms.
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Rev. 0.3