전자부품 데이터시트 검색엔진 |
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BA3842 데이터시트(PDF) 10 Page - Rohm |
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BA3842 데이터시트(HTML) 10 Page - Rohm |
10 / 13 page L : 0V H : VCC 572 Audio ICs BA3842F FCircuit operation (1) Operating power supply voltage range Within the operating power supply voltage range, circuit functioning is guaranteed as long as the operating tem- perature range is not exceeded. However, verify carefully that the voltage, temperature, and component values are appropriate. (2) Control pins and control voltage settings (1) The DC control range is 0 V to VCC for the preset equalizer and the dynamic bass boost control pins (pins 18 and 19). Make sure that the voltage applied to these control pins does not exceed VCC. (2) Mode switch threshold values are determined by di- viding resistors between VCC and GND of both the preset equalizer and bass boost. If the control voltages are di- vided from the supply voltage of the IC, they will have greater tolerance with respect to VCC fluctuations. (3) During mode switching, an abrupt change in the level of the DC output may occur, causing a sound. In this case, add the capacitor and resistor indicated in the ap- plication, or only the capacitor as needed. 4) Here is an example of determining the control pin voltage setting with the input of three values. Connect OUT to the control pin. Regarding the values of the various constants, it is impor- tant to consider current dissipation and other such prob- lems. If such a problem should occur, change the constants and redesign the diode logic. OUT C B A 0 V L L L 1.3 V L L H 3 V L H L 5 V L H H 7 V H L L 9 V H L H (3) Input coupling capacitors Note that the polarity of the input coupling capacitors will change depending on the DC voltage to which they are connected. Set capacitors based on the frequency band to be used, taking into consideration the fact that the in- put impedance is 50k Ω. (4) Load resistances If the values of the load resistors are too small, the output gain and total harmonic distortion may fluctuate slightly. Take this into consideration when connecting the subse- quent stage. (5) The dynamic bass boost filter is a multi feedback active filter which forms the B.P.F. FO can be changed with the C value. fO = 1 / [2 π {(R1 //R2) R3 C1 C2}1/2] Q = 1 / 2 {(R3 /(R1 //R2)}1/2 HO = R3 /{R1 (1 )C1 /C2)1/2} When R1 = 2.4k Ω, R2 = 4.3kΩ, R3 = 91kΩ, and C1 = C2 = 0.22 µF, fO 61Hz Q 3.8 HO 19 If R1 and R2 are too small, the bass boost characteristics such as boost gain and crosstalk may change. Keep this in mind when setting filter values. Furthermore, design the application so that the bass boost level increments by 5dB from 5 to 20dB when HO = 19. |
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