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National Semiconductor Corporation (NS) has introduced a new professional-grade audio system buffer featuring the industry's lowest noise and harmonic distortion. This LME49600 snubber chip is the latest in the National Semiconductor's high-fidelity LMETM audio amplifier family, providing enough output current to drive multiple low-impedance headphones and voltage swings to drive multiple high-impedance headset. In addition, this buffer is used in a wide range of applications, in addition to line drivers, analog/digital converter input drivers, and a wide range of low noise regulators, as well as headphones for driving mixer consoles. The amplifier's output stage and the capacitive load of the low-power audio amplifier.The LME49600's high fidelity not only provides fast response to a wide dynamic range of inputs, but also ensures accurate reproduction of these signals without any noise or distortion. The chip offers 180MHz bandwidth, a slew rate of up to 2000V/us, and an input reference voltage noise density of only 3nV/rtHz. Closed-Loop Configuration If this chip is used with National's LME49710 single-channel operational amplifier, the total harmonic distortion and noise can be as low as 0.00003%. This LME49600 chip with +/-250mA output, together with the LME49710 chip and the LM4040 low-noise bandgap reference circuit configuration, can be a high-performance, low-noise, high-bandwidth regulator that meets the needs of audiophiles.
The LME49600 chip is manufactured using National's proprietary and patented VIP3 process technology. Because this high-voltage, high-performance complementary bipolar process technology uses vertically integrated NPN and PNP transistors, it can increase the peak-to-peak swing of the output voltage, especially for high-end high-voltage audio systems.
The LME49600 is a high performance, low distortion, high fidelity audio headphone buffer that continuously outputs and receives 250mA. As long as this chip is added to the op amp feedback loop, the output current can be increased, the capacitive load drive capability can be improved, and the problem of overheat feedback can be solved in one fell swoop. The LME49600 can be supplied with different bandwidths via pins, including low currents that consume only 8mA, 110MHz bandwidth mode, and 180MHz wideband mode that consumes only 15mA. Regardless of which mode is used, the LME49600 has a rated slew rate of up to 2000V/us. The applicable bandwidth can be easily selected by simply disconnecting the bandwidth control pin or by using a resistor to connect the bandwidth pin to the emitter voltage pin. In addition, the chip operates from a supply voltage range of +/-2.25V to +/-18V with limited current and thermal shutdown. Whenever the junction temperature rises above 150 degrees Celsius, these two protection functions are activated to provide full protection for the chip.
The LME49600 is available in a 5-pin TO-263 surface mount package and is priced at $4.50 each in 1,000-unit quantities.
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