BH3856 ROHM [Rohm], BH3856 Datasheet - Page 15

• Manufacturer Part Number: BH3856
• Description: 2-wire serial sound control IC
• Manufacturer: ROHM [Rohm]

Audio ICs
(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 (V
timing shifts, on interference due to digital noise.
(8) Matrix surround
(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 V
(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 V
• If a capacitor with goof high-frequency characteristics is connected in parallel with the capacitor connected to V
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.
Input
Input
∗The matrix surround circuit construction is as shown in the diagram above. The gain is obtained from the formulas
(However, reverse-phase gain is for input to one channel only)
Do not apply voltages above V
Phase Gain
Negative Phase Gain
in the diagram.
L →
R →
+
+
+
+
+
0dB
6dB
+
+
ref
to the terminals.
ref
.
(2L-R)
(2R-L)
Output
Output
ref
terminal should be connected to the digital GND.
ref
(3.8V)). For this reason, there is no need to worry about
BH3856S / BH3856FS
ref
, the