BH3856 Ver la hoja de datos (PDF) - ROHM Semiconductor

Número de pieza

componentes Descripción

Fabricante

BH3856

2-wire serial sound control IC

ROHM Semiconductor 

Audio ICs

BH3856S / BH3856FS

(7) Digital / analog separation

The digital and analog power supplies and grounds for this IC (BH3856) are completely separate. The digital circuits are

supplied from a stable reference source that is on the chip (Vref (3.8V)). For this reason, there is no need to worry about

timing shifts, on interference due to digital noise.

(8) Matrix surround

L→

Input

++

+

++

+

Input

R→

+

Output

(2L-R)

Output

(2R-L)

∗The matrix surround circuit construction is as shown in the diagram above. The gain is obtained from the formulas

in the diagram.

Phase Gain

0dB

Negative Phase Gain 6dB

(However, reverse-phase gain is for input to one channel only)

(9) DC control

An internal impedance of 30kΩ is seen from the VC1, VC2, TC and BC terminals, are 200kΩ is seen from the SC (pin 11)

terminal, so with regard to DC control, we recommend direct control with the voltage source. When using variable volume,

take the impedance into consideration when making the setting.

Note : The DC control voltage range is 0V to Vref.

Do not apply voltages above Vref to the terminals.

(10) GND

• As shown in the application circuit example, connect the external component GND to the analog GND.

• However, the GND for the capacitor connected to the Vref terminal should be connected to the digital GND.

• If a capacitor with goof high-frequency characteristics is connected in parallel with the capacitor connected to Vref, the

performances of the circuit with respect to static noise will improve (we recommend a ceramic capacitor of between

0.001µF and 0.1µF)

• When using long digital and analog ground lines, take care to ensure that there is no potential difference between the

two ground lines.

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