BD3403FV ROHM [Rohm], BD3403FV Datasheet - Page 13

• Manufacturer Part Number: BD3403FV
• Description: Sound Processors with Built-in 3-band Equalizers
• Manufacturer: ROHM [Rohm]

●Notes for use
BD3403FV,BD3861FS,BD3883FS
© 2010 ROHM Co., Ltd. All rights reserved.
www.rohm.com
10) Function switching
11) Power-ON Reset (BD3883FS)
12) Step switching noise (BD3883FS)
1) Numbers and data in entries are representative design values and are not guaranteed values of the items.
2) Although ROHM is confident that the example application circuit reflects the best possible recommendations, be sure to
3) Absolute maximum ratings
4) GND potential
5) Thermal design
6) Short circuit between terminals and erroneous mounting
7) Operation in strong electromagnetic field
8) 2-wire serial control
9) E Input external resistance (BD3883FS)
verify circuit characteristics for your particular application. Modification of constants for other externally connected circuits
may cause variations in both static and transient characteristics for external components as well as this Rohm IC. Allow
for sufficient margins when determining circuit constants.
Use of the IC in excess of absolute maximum ratings, such as the applied voltage or operating temperature range (Topr),
may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open mode)
when such damage is suffered. A physical safety measure, such as a fuse, should be implemented when using the IC at
times where the absolute maximum ratings may be exceeded.
Ensure a minimum GND pin potential in all operating conditions. Make sure that no pins are at a voltage below the GND
at any time, regardless of whether it is a transient signal or not.
Perform thermal design, in which there are adequate margins, by taking into account the permissible dissipation (Pd) in
actual states of use.
Pay attention to the assembly direction of the ICs. Wrong mounting direction or shorts between terminals, GND, or other
components on the circuits, can damage the IC.
Using the ICs in a strong electromagnetic field can cause operation malfunction.
Because SC and SI terminals are designed for inputting high-frequency digital signals, wiring and layout patterns should
be routed as not to cause interference with the analog-signal-related lines.
To avoid a sudden noise into E Input, external resistance (4.7kΩ) should be connected as close as possible to the IC terminal.
Action to absorb shock sounds is taken when switching between the Volume, Treble, Middle and Bass functions.
A built-in circuit for performing initialization inside the IC at Power-ON is provided. Specifically, the initial states are set
as described in the table below. In the case of the setting design, however, to be on the safe side, it is recommended
that data shall be sent to all the addresses as initial data at power-ON and, until this sending operation is completed,
MUTE shall be applied. To avoid malfunctions, serial data signals must be set to the Low state at power-ON/OFF.
For Surround and Rear Volume, an external capacitor C is attached to the CAP pin to control the switching step noise.
In the application circuit, a constant value, as an example, is shown by the CAP pin.
The time constant for charge/discharge of the capacitor C (varying between VBE to 5VBE (2.65V)) controls the slow
switching operation.
The switching time constant T is calculated as the follows:
VBE has temperature characteristics and may affect the value of the time constant T.
Input Selector
Input Gain
RECOUT
Volume
Surround
Treble
Middle
Bass
Rear Volume
T=2.55×10
Function
5
×C
Initial State
MUTE
∞dB
0 dB
0 dB
0 dB
0 dB
13/15
OFF
OFF
0dB
Technical Note
2010.10 - Rev.A