BU8242F 데이터 시트보기 (PDF) - ROHM Semiconductor

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BU8242F

Cross point mixer for telephones

ROHM Semiconductor 

Communication ICs

BU8241F / BU8241FS / BU8242F / BU8244F

FSelecting attached components

1) Components related to power supply and bias

3) Components related to output pins

C602: VDD bias capacitor; normally 10µF

C603: VB decoupling capacitor; normally 10µF

2) Components related to input pins

C613 to C620: DC cutoff capacitor. A value should be

selected which does not attenuate voice

signals in the high band (300 Hz X).

R613 to R620: Output load resistors. This should nor-

mally be left open.

If using R615 to R620, select values that

result in a total input impedance of 10kΩ

or greater on the output side. If the total

impedance is less than 10kΩ, the load

on the output amplifier of the cross-point

mixer will be excessive, and signals

may be lost.

C605 to C612: DC cutoff capacitor. A value should be

selected which does not attenuate voice

signals in the high band (300 Hz X).

R605 to R612: Resistor which sets the input level. This

should normally be left open.

The constants shown in Figure 8 are set

to match the oscillator output imped-

ance.

273

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