BU8241F Datasheet, PDF (8/11 Pages) Rohm – Cross point mixer for telephones

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.
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