LM4906, LM4906LDBD, LM4906MMBD

SNAS191E – APRIL 2003 – REVISED MAY 2013

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The final design step is to address the bandwidth requirements which must be stated as a pair of

−3dB

frequency points. Five times away from a

−3dB point is 0.17dB down from passband response which is better

than the required ±0.25dB specified.

fL = 100Hz / 5 = 20Hz

fH = 20kHz * 5 = 100kHz

As stated in the External Components Description section, Rin (20k) in conjunction with C2 create a highpass

filter.

C2 ≥ 1 / (2π*20kΩ*20Hz) = 0.397µF; use 0.39µF

Figure 26. REFERENCE DESIGN BOARD SCHEMATIC

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