BU7831KN_06 Datasheet, PDF (15/17 Pages) Rohm – Voice/Audio Mixer & Selector

●Cautions on use
1) Absolute maximum ratings
An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating
conditions, etc., can break down the devices, thus making impossible to identify breaking mode, such as a
short circuit or an open circuit. If any over rated values will expect to exceed the absolute maximum ratings,
consider adding circuit protection devices, such as fuses.
2) Operating conditions
Characteristics are guaranteed under the conditions of each specified parameter.
3) Reverse polarity connection of the power supply
Connecting of the power supply in reverse polarity can damage IC. Take precautions when connecting the
power supply lines. An external direction diode can be added.
4) Power supply line
Design PCB layout pattern to provide low impedance GND and supply lines. To obtain a low noise
ground and supply line, separate the ground section and supply lines of the digital and analog blocks.
Furthermore, for all power supply terminals to ICs, connect a capacitor between the power supply and the
GND terminal. When applying electrolytic capacitors in the circuit, note that capacitance characteristic
values are reduced at low temperatures.
5) GND voltage
GND potential should maintain at the minimum ground voltage level. Furthermore, no terminals should be
lower than the GND potential voltage including electric transients.
6) Short circuit between terminals and GND or other devices
Pay attention to the assembly direction of the ICs. Wrong mounting direction or shorts between terminals to
GND, or other components on the circuits, can damage the IC.
7) Operation in a strong electromagnetic field
Using the ICs in a strong electromagnetic field can cause operation malfunction.
8) Inspection with set PCB
During testing, turn on or off the power before mounting or dismounting the board from the test board.
Do not power up the board without waiting for the output capacitors to discharge. The capacitors in the low
output impedance terminal can stress the device. Pay attention to the electro static voltages during IC
handling, transportation, and storage.
9) Input terminals
In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The
operation of the parasitic element can cause interference with circuit operation, thus resulting in a
malfunction and breakdown of the input terminal. Therefore, pay thorough attention not to apply a
voltage lower than the GND to the input terminals. Furthermore, do not apply a voltage to the input
terminals when no power supply voltage is applied to the IC. In addition, even if the power supply
voltage is applied, apply a voltage lower than the power supply voltage to the input terminals, or a
voltage within the guaranteed value of electrical characteristics.
10) Ground wiring patterns
The power supply and ground lines must be as short and thick as possible to reduce line impedance.
Fluctuating voltage on the power ground line may damage the device.
11) External capacitor
When using external ceramic capacitors, consider degradation in the nominal capacitance value due to DC bias and
changes in the capacitance with temperature.
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