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## 4610M-802-500103 Datasheet(PDF) 44 Page - Bourns Electronic Solutions

 Part No. 4610M-802-500103 Description Resistor Networks Product Selection Guide Download 62 Pages Scroll/Zoom 100% Manufacturer BOURNS [Bourns Electronic Solutions] Direct Link http://www.bourns.com Logo

## 4610M-802-500103 Datasheet(HTML) 44 Page - Bourns Electronic Solutions

 44 / 62 pageSpecifications are subject to change without notice.320General DescriptionContinual advances in digital IC technology are creatingstringent demands on EMI/RFI levels in equipment.EMI/RFI low pass filters are required in personalcomputers, data terminals, test equipment and process con-trollers for high frequency suppression into or out of elec-tronic equipment.Filter Selection and Design ConsiderationsThe “roll-off” frequency fc, defined as the frequency atwhich the filter passes one-half the power it receives at itsinput terminal, can be specified from the low megahertzrange up to about 100MHz. This frequency, also known asthe “-3 dB” frequency, will be determined by the R and Cvalues chosen. Custom resistor and capacitor values areavailable to optimize system performance.The specification of these values will depend on con-straints relating to noise frequencies, system performanceand driver loading. The following procedure is suggested tochoose appropriate values of R and C.The first step is to determine the desired roll-offfrequency of the filter, which will lie between the signalfrequency and the dominant frequencies of the EMI/RFInoise. By determining the pole of the filter (setting thedenominator of the transfer function equal to zero), theroll-off frequency can be expressed in terms of R and C:fc =RS + RL + 2R2πC(R + RS)(R + RL)Furthermore, the RC combination must be chosen sothat the additional RC time delay will not result in exceedingthe sampling window of the receiving IC, due to excessivelengthening of signal rise and fall times.Rise time from 10% to 90% of the waveform amplitudecan be calculated in terms of the circuit’s RC time constantusing the 1 –exp (–t/RC) relationship for a charging capacitor.At 10%, t L = 0.1 time constants, and at 90%, tH = 2.3 timeconstants. “Time constant” equals RthC, where Rth is theThevenin-equivalent resistance as seen by the capacitor.Therefore, equating the difference in the two times tothe maximum tolerable rise (or fall) time:tmax = t H - tL = 2.2RthCtmax = 2.2(R + RS)(R + RL)CRS + RL + 2RA final consideration is the insertion loss. As mentionedpreviously, the voltage drop across the two resistors willattenuate the voltage reaching the load. Normally, logic highand low levels will still be within valid limits. The signalattenuation can be minimized by choosing small R values rel-ative to the load impedance. Typical values for R range from10 to 50 ohms.Bourns Low-pass Filters for EMI/RFI SuppressionNO. OF LINESBOURNS P/NPACKAGE74118R-601-RC/CC84120R-601-RC/CCDIP84420P-601-RC/CCWide Body SMDRCRCCC25025Ω50050pF27027Ω101100pF47047Ω181180pF82082Ω201200pF101100ΩStandard Resistance/Capacitance Values And CodesApplication Notes – EMI/RFI Filters 601 Series

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