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LM4663 bảng dữ liệu(PDF) 1 Page - National Semiconductor (TI) |
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LM4663 bảng dữ liệu(HTML) 1 Page - National Semiconductor (TI) |
1 / 10 page LM4663 2 Watt Stereo Class D Audio Power Amplifier with Stereo Headphone Amplifier General Description The LM4663 is a fully integrated single supply, high effi- ciency Class D audio power amplifier solution. The LM4663 utilizes a continuous time delta-sigma modulation technique that lowers output noise and THD when compared to con- ventional pulse width modulators. The LM4663 also features a stereo headphone amplifier that delivers 80mW into a 32 Ω headset with less than 0.5% THD. The LM4663 has two stereo inputs that can be selected to drive either the headphone amplifier or the Class D amplifier. All amplifiers are protected with thermal shutdown. In standby mode, the LM4663 draws an extremely low 2µA supply current. With a 4 Ω load, the IC’s efficiency for a 250mW power level is 69%, reaching 83% at a power level of 2W. The IC features click and pop reduction circuitry that minimizes audible popping during device turn-on and turn-off. The LM4663 is available in a 24-lead TSSOP pack- age, ideal for portable and desktop computer applications. Key Specifications n P O at THD+N=1% 2.1W (typ) n THD+N at 1kHz at 1 Watt into 4 Ω (Power Amp) 0.2% (typ) n Efficiency at 2 Watt into 4 Ω 83% (typ) n Efficiency at 250mW into 4 Ω 69% (typ) n Total quiescent power supply current 22mA (typ) n Total shutdown power supply current 2µA (typ) n THD+N 1kHz, 20mW, 32 Ω (Headphone) 0.15% (typ) n Single supply range 4.5V to 5.5V Features n Delta-sigma modulator. n Two stereo input selector. n “Click and pop” suppression circuitry. n Micropower shutdown mode. n 24 lead TSSOP package (No heatsink required). n Stereo headphone amplifier. Applications n Portable computers n Desktop computers n Multimedia Monitors Block Diagram Connection Diagram BOOMER™ is a trademark of National Semiconductor Corporation. DS101269-1 TSSOP Package DS101269-2 Top View Order Number LM4663MT See NS Package Number MTC24 (TSSOP Package) January 2000 © 2000 National Semiconductor Corporation DS101269 www.national.com |
Số phần tương tự - LM4663 |
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Mô tả tương tự - LM4663 |
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