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BU7861KN Datasheet(PDF) 7 Page - Rohm |
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BU7861KN Datasheet(HTML) 7 Page - Rohm |
7 / 13 page 7/12 ●Lowpass Correction Circuit The headphone output terminal (either HP_X or HPX_OUT) has a built-in “lowpass correction circuit” to correct lowpass decay, comprised of output coupling capacity and headphone impedance. Fig.15 Headphone Output Section Equivalent Circuit Lowpass Cut-off Frequency fC= 1/(2・π・CL・RL) Lowpass Boost Frequency fBOOST = 1/(2・π・CCHPx・200kΩ) Boost Gain ABOOST = 20・log((200 kΩ+1/(2・π・f・CCHPx))/100 kΩ) (Maximum lowpass boost is 6dB.) The constant configuration calculates the lowpass cut-off frequency fC after confirming the output coupling capacity CL and headphone impedance RL used. CCHPx is determined in order for the lowpass cut-off frequency fC and lowpass boost frequency fBOOST to roughly correspond. The recommended constants are CL = 100μF, when RL = 16Ω and CCHPx = 6800pF. The chart below shows the frequency characteristics (calculated values) during recommended constant use. Fig.16 Low pass Correction Circuit Frequency Characteristics + - 200kΩ 200kΩ + HP_X or HPX_OUT HP_XI or HPX_FB CCHPx CL RL OUTPUT 100kΩ -40 -35 -30 -25 -20 -15 -10 -5 0 5 10 1 10 100 1000 10000 100000 Frequency [Hz] After correction Before correction Amp Output |
Número de pieza similar - BU7861KN_08 |
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Descripción similar - BU7861KN_08 |
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