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LM4753 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4753
Description  Dual 10W Audio Power Amplifier w/Mute, Standby and Volume Control
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com

LM4753 Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Typical Performance Characteristics (Continued)
Application Information
The LM4753 has a number of valuable functions that make
this audio amplifier IC an all-in-one solution. The IC has a
stereo audio path from input to output with a DC voltage con-
trolled volume attenuator in the preamp section. After the
volume attenuator is a line-out connection for preamp-out
control. The attenuation curve versus DC voltage can be
found by referring to the Volume Attenuation vs DC Voltage
graph in the Typical Performance Characteristics section.
The IC also possesses a mute function to provide audio at-
tenuation as used on a remote control for a TV, as well as a
standby function for power conservation when not being
used. The IC is well protected with thermal shutdown and
output AC short circuit protection.
Mute Function
The muting function of the LM4753 allows the user to mute
the music going into the amplifier, providing over 60 dB of at-
tenuation from input to output. The function is enabled by
placing a logic “1” or 5V onto the mute pin, pin 10. To disable
the function, allowing music to be passed to the output, a
logic “0” or 0V should be placed on the mute pin. By placing
the device into mute mode, each of the power amplifier out-
puts are simultaneously muted. The DC volume control and
line-out amplifiers are not affected by the mute function.
Please refer to
Table 1 for each input condition.
To prevent mechanical switch bouncing from adversely af-
fecting the functionality of the IC, an RC lowpass filter should
be used as shown in
Figure 2. This circuit replaces the need
for a debounce circuit when using a mechanical switch to
control the IC logic functions. However, most systems typi-
cally utilize a microprocessor or COP microcontroller to inter-
face with the logic control functions of the LM4753. When a
clean logic signal is used, as from a microcontroller, the RC
lowpass filter is not required.
Standby Function
The standby function allows the user to place the LM4753
into a power conserving mode that draws less than 10 mA of
quiescent power supply current. With the IC in this mode,
while using +22V for the supply voltage, the IC draws about
150 mW of power.
The standby function is enabled by placing a logic “1” or 5V
onto the standby pin, pin 9. To disable the function allowing
music to be passed to the output, a logic “0” or 0V should be
placed on the standby pin. When the standby function is en-
Supply Current
vs Supply Voltage
Power Dissipation vs
Output Power
Power Dissipation vs
Output Power
Channel Separation
vs Frequency
Attenuation vs Frequency
Volume Attenuation vs
DC Voltage
FIGURE 2. Mute and Standby Pin Lowpass Filters

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