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AN4426 Datasheet(PDF) 8 Page - STMicroelectronics |
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AN4426 Datasheet(HTML) 8 Page - STMicroelectronics |
8 / 18 page Mechanical specifications, construction details AN4426 8/18 DocID025704 Rev 1 Figure 9. EMC test setup Basically the test consists of placing the microphone under an antenna radiating a disturbance signal of 1 kHz AM modulated in the range [0.8, 3] GHz. The RF amplitude differs depending on the frequency range according to the following criteria: +33dBm in the range [0.8, 2.4] +17dBm in the range [2.4, 3.0] Figure 10. RF test disturbance signal The carrier of the disturbance is 1 kHz since it is an audio signal. Hence, the RF immunity of the microphone is evaluated by measuring the residual of the carrier at the output of the Signal generator RF Amplifier EMC jig IN OUT RF out RF in +33dBm @450,900° 1800MHz RF antenna Dig Mic Quality Board VDD gnd Data CLK DECIMATOR BOARD PC Attenuator+50 Ω Termination Amplified RF out Labview Routine Power Meter Coupler bring out 3.3V level signals and send them to Labview routine Signal generator RF Amplifier EMC jig IN OUT RF out RF in +33dBm @450,900° 1800MHz RF antenna Dig Mic Quality Board VDD gnd Data CLK DECIMATOR BOARD PC Attenuator+50 Ω Termination Amplified RF out Labview Routine Power Meter Coupler Only level shifters are used to bring out 3.3V level signals and send them to Labview routine |
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Similar Description - AN4426 |
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