BH3810 Rohm, BH3810 Datasheet - Page 9

• Manufacturer Part Number: BH3810
• Description: Vocal fader IC with input selector
• Manufacturer: Rohm

•
(1) We guarantee the application circuit design, but recommend that you thoroughly check its characteristics in actu-
al use.
If you change any of the external component values, check both the static and transient characteristics of the circuit,
and allow sufficient margin in your selections to take into account variations in the components and ICs.
Note that Rohm has not fully investigated patent rights regarding this product.
(2) The vocal fader function
The effect of the vocal fader is realized by negating the same-phase components. In the bass region, the first-stage
low-pass filter leaves the source sound as is, even for the same-phase components. Therefore, depending on the
music, the effect may be small.
(3) The low-pass filter that leaves the vocal fader bass
The low-pass filter is formed by connecting a capacitor to pin 6. A 20k
the cutoff frequency.
The optional attenuation of the first-stage low-pass filter frequency is:
(4) AGND (pin 10) and DGND (pin 12)
AGND is the ground for the IC's internal analog circuits, and DGND is the ground for the internal ports 1 to 10.
Connect the two grounds externally.
(5) Switching noise
If you are troubled by switching noise that occurs when the input selector, gain selector, or mode selector are
switched, use muting, or some other appropriate countermeasure.
(6) Serial control
The LATCH and DATA serial signals are received on the same terminal, and the signals are differentiated by voltage
level. A diode and resistor are connected to perform a conversion to logic voltage (0 to 5V). The threshold values
will change depending on the external components, so select them carefully.
If the signals are not being received very well, connect a capacitor of about 100pF between the SI terminal (pin 13),
and the DGND terminal (pin 12).
•
Multimedia ICs
Operation notes
External dimensions (Units: mm)
fc
A (f)
=
=
2 CR
20 log
1
32
1
0.8
13.6
(Hz)
0.2
0.36
SSOP-A32
1 + (2 fCR)
0.1
17
16
1
0.3Min.
2
(dB)
0.15
C: external capacitor
R: 20k (design value)
f: frequency
resistor (design value) and this capacitor set
BH3810FS
9