SI4827 datasheet(9/42 Pages) SILABS

номер детали	SI4827

подробное описание детали	Si4822/26/27/40/44-DEMO BOARD TEST PROCEDURE

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AN603

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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