BH3854AFS Ver la hoja de datos (PDF) - ROHM Semiconductor

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Fabricante

BH3854AFS

Serial sound control IC

ROHM Semiconductor 

Audio ICs

(13) DC control

There is internal impedance of 10kΩ at the VC (pin 23),

TC (pin 22), and BC (pin 21) pins, and internal imped-

ance of 200kΩ at the SC pin (pin 11). For this reason, it

is recommended that DC control of these pins be per-

formed by voltage delivered directly from the voltage

source. When using variable volume, take the imped-

ance into account in determining the settings.

Note: The voltage range for DC control is 0V to 3.8V. Be

sure not to apply greater than 3.8V to any pin.

(14) GND

S Connect the GND of the attached element, which is

shown in the circuit of the sample application, to the

analog GND.

S Connect the GND of the capacitor that is connected to

pin 17 to the digital GND.

S If several capacitors with good high-frequency charac-

FElectrical characteristic curves

BH3854AS / BH3854AFS

teristics are connected in parallel to the 17th-pin capac-

itor, the characteristics will be improved with respect to

static electricity noise. (Recommended: ceramic ca-

pacitors of 0.001µF to 0.1µF) If the wiring to the analog

GND and digital GND is long, make sure that no poten-

tial difference arises between the two GNDs.

(15) BH3854AS ! BH3854AFS: Differences

S The bass filter R2 constant changes from 100 kΩ ! 85

kΩ. Accordingly, bass filter f0 changes from 70Hz !

75Hz, which means bass filter Q changes from 1.47 !

1.36.

S The resistance at the treble filter’s TIN pin changes

from 20 kΩ ! 2 kΩ. Accordingly, the value for the at-

tached capacitor changes from 470pF ! 0.01µF,

which means that cutoff frequency (fC1) changes from

17kHz ! 8kHz.

FExternal dimensions (Units: mm)

647

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