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AN4540 Datasheet(PDF) 7 Page - STMicroelectronics |
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AN4540 Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 11 page DocID026512 Rev 1 7/11 AN4540 Solutions offered by STMicroelectronics 11 Figure 8. Common mode attenuation comparison The attenuation in the GSM frequencies and the clock signal integrity are very difficult to get due to the technology with CMF standard. Indeed, the attenuation curve has to be translated into high frequencies, limiting the attenuation performance in the frequency range. ESD protection on the data lines as well as on CBUS line is a benefit given by the ECMF02- 3HSM6. Its sharp clamping allows the transmitter to be protected against various surges such as ESD strikes. Furthermore, clamping robustness is guaranteed for more than one thousand discharges. Figure 9 shows the clamping response comparison between the ECMF02-3HSM6 and CMF including MOV devices at 8 kV in contact mode. Clamping levels are much better with the silicon solution. Moreover, the difference is more important when ESD strike level is lower. Figure 9. IEC61000-4-2 clamping comparison (VPP = ± 8 kV) Figure 10 shows responses at 1 kV. |
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