Two-way Audio Amplification System With Volume Control - National Semiconductor

The LM4830 is an integrated solution for two-way Audio am- plification. It contains a bridge-connected Audio power ampli- fier capable of delivering 1W of continuous average power to an 8 load with less than 1% THD from a 5V power supply. It also has the capability of driving 100 mW into a single-ended 32 impedance for headset operation. There is a 30 dB Attenuator in front of a bridged power Amplifier with 6 dB of gain. The attenuation is controlled through 4 bits of parallel digital control; 15 steps of 2 dB each. The device also contains a Microphone preamp with two se- lectable inputs. Mic2 is selected when HS is high and A1 is in single-ended mode. Mic1 is selected when HS is low and A1 is in bridged mode. This configuration is optimum for switch- ing between an internal system speaker and external head- set with Microphone The device also incorporates a Buffer used for driving capacitive loads. The LM4830 also provides a low-current consumption shut- down mode making it optimally suited for low-power portable systems. In addition, the device has an internal thermal shut- down protection mechanism. By National Semiconductor Corporation
LM4830 's PackagesLM4830 's pdf datasheet

LM4830 Pinout, Pinouts
LM4830 pinout,Pin out
This is one package pinout of LM4830,If you need more pinouts please download LM4830's pdf datasheet.

LM4830 Application circuits
LM4830 circuits
This is one application circuit of LM4830,If you need more circuits,please download LM4830's pdf datasheet.

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