LM4809MMX/NOPB

Series:	Boomer®
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Class AB
Output Type:	Headphones, 2-Channel (Stereo)
Max Output Power x Channels @ Load:	105mW x 2 @ 16 Ohm
Voltage - Supply:	2 V ~ 5.5 V
Features:	Depop, Shutdown, Thermal Protection
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Supplier Device Package:	8-VSSOP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Base Part Number:	LM4809

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LM4809MMX/NOPB Application Field and Working Principle

The LM4809MMX/NOPB, produced by Texas Instruments, is a monolithic output stage and filter specifically designed for audio applications. This filter is designed to reduce noise, improve signal clarity, and provide a more "stereo" sound when linked to two or more amplifier channels. The LM4809MMX/NOPB is ideal for applications such as full-range speakers, subwoofers, and pre-amplifiers.

General Overview of LM4809MMX/NOPB

The LM4809MMX/NOPB is a monolithic filter. It features a single differential amplifier filter stage, with a DC output voltage, a 10kHz filter bandwidth, and a voltage rating between ±5V and ±12V. The LM4809MMX/NOPB includes an output stage and includes a thermal shutoff feature to protect the filter from overheating. The LM4809MMX/NOPB is also capable of accepting a large signal range. The input offset voltage of the LM4809MMX/NOPB is typically 25mV, with an input voltage range of 0 to 12V, and a maximum input current of 10mA. The large signal range allows for the filter to be used in a wide variety of audio applications, such as consumer audio systems.

How Does the LM4809MMX/NOPB Work?

The LM4809MMX/NOPB consists of two main sections: an active filter and an output stage. The filter section consists of an operational amplifier, two input networks (resistor and capacitor), and two feedback networks (resistor and capacitor). The filter amplifies the current signal and passes it to the output stage. The input and feedback networks are used to determine the filter specifications, such as the cut-off frequency, signal gain, and signal resolution.The output stage consists of a push-pull output configuration, which amplifies the current signal and passes it to the load. This output configuration provides a high current output, allowing for the filter to be used in a variety of audio applications. The output voltage of the filter can be adjusted by controlling the gain of the operational amplifier, allowing for precise control of the sound.The “thermal shutoff” feature ensures that the filter does not overheat due to excessive current. This feature includes a temperature sensor and a switch, which are used to detect any excessive current and to shut off the filter if necessary.

LM4809MMX/NOPB in Audio Applications

The LM4809MMX/NOPB is specifically designed for audio applications, due to its high current output and its wide input range. This filter is especially useful for applications that require low-noise reproduction of signals, such as stereo systems and full-range speakers.The filter is also capable of providing a “stereo” sound, as it is able to filter two or more audio channels separately. This allows for the user to control the level of each channel separately, which is especially useful for applications such as subwoofers.The LM4809MMX/NOPB is also particularly useful for pre-amplifier applications, due to its high current output. This allows for the pre-amplifier to pass signals from one stage to another, without any noise or distortion.

Conclusion

The LM4809MMX/NOPB is a versatile monolithic filter, which is specifically designed for audio applications. The filter features a single stage differential amplifier filter, with a wide input range, a 10kHz filter bandwidth, and a push-pull output configuration. The thermal shutoff feature ensures that the filter does not overheat when used in high-current applications. The LM4809MMX/NOPB is ideal for a wide variety of audio applications, such as full-range speakers, subwoofers, and pre-amplifiers. Additionally, the filter provides a “stereo” sound, when linked to two or more amplifier channels. With its versatile design and low noise and distortion levels, the LM4809MMX/NOPB is a great choice for any audio application.

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