SP4438 Datasheet, PDF (6/19 Pages) Sipex Corporation – Ultra-Quiet Electroluminescent Lamp Driver For Cellular Phone Applications

EL Lamp Noise Measurement Set-Up
2”
4”
1”
Microphone
Type 4188
Photometer
Tek-J17
Anechoic Chamber
Bruel & Kjaer
2238 Mediator
A-Weighting
dBSPL
Measurement
Aux 1
HP8903A Audio Analyzer - SPCL 3.1, 1.17
Preamplifier with 30kHz High Pass Filter
Differential
Voltage Probe
Current
Probe
EL Driver
Monitor
Tek754C Digital Osciliscope
Voltage Waveform Measurements
Figure 4: Dual Supply Application Circuit for the SP4438
EL Lamp Noise Measurement Set-Up
1”
2”
Microphone
Type 4188
4”
Photometer
Tek-J17
Anechoic Chamber
Bruel & Kjaer
2238 Mediator
A-Weighting
dBSPL
Measurement
Aux 1
HP8903A Audio Analyzer - SPCL 3.1, 1.17
Preamplifier with 30kHz High Pass Filter
Differential
Voltage Probe
Current
Probe
EL Driver
Monitor
Tek754C Digital Osciliscope
Voltage Waveform Measurements
Figure 5. Electroluminescent Lamp Noise Measurement Setup for the SP4438
Rev. 11/13/00
SP4438 Ultra-Quiet Electroluminescent Lamp Driver
6
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