LM4830 National Semiconductor, LM4830 Datasheet - Page 11

• Manufacturer Part Number: LM4830
• Description: Two-Way Audio Amplification System with Volume Control
• Manufacturer: National Semiconductor

Application Information
This feature is especially useful when the IC is used in por-
table battery operated systems where energy conservation
is imperative.
In many applications, a microcontroller or microprocessor
output interfaces to the LM4830 shutdown pin, providing a
quick, smooth transition into shutdown. Another solution is to
use a single-pole, single-throw switch in conjunction with an
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external pull-up resistor. When the switch is closed, the shut-
down pin is connected to ground and enables the amplifier. If
the switch is open, the external pull-up resistor disables the
LM4830 by bringing the shutdown pin up to V
scheme guarantees that the shutdown pin will not float, pre-
venting unwanted state changes.
Additionally, when the IC comes out of shutdown the IC’s
volume attenuation setting will remain unchanged.
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