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LM4753 Datasheet(PDF) 6 Page - National Semiconductor (TI) |
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LM4753 Datasheet(HTML) 6 Page - National Semiconductor (TI) |
6 / 13 page Typical Performance Characteristics (Continued) Application Information GENERAL FEATURES 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 DS100043-20 Power Dissipation vs Output Power DS100043-21 Power Dissipation vs Output Power DS100043-22 Channel Separation vs Frequency DS100043-23 Attenuation vs Frequency DS100043-24 Volume Attenuation vs DC Voltage DS100043-25 DS100043-26 FIGURE 2. Mute and Standby Pin Lowpass Filters www.national.com 6 |
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