LM4874 Datasheet | National Semiconductor

Description The LM4874 features differential stereo inputs, BTL (bridgetied load) outputs, and four externally selectable fixed gains. Operating on a single 5V supply, the LM4874 delivers 1.2W, 1.9W, or 2.1W (typ) of output power to an 8Ω, 4Ω, or 3Ω BTL load (Note 1), respectively, with less than 1% THD+N. The LM4874’s gain is selected using two digital inputs. The nominal gain values are 6d B, 10d B, 15.6d B, and 21.6d B. The LM4874 is designed for notebook and other handheld portable applications. It delivers high quality output power from a surface-mount package and requires few external ponents. Other features include an active-low micropower shutdown mode input and thermal shutdown protection. j BTL output power RL = 8Ω, VDD = 5.0V, and THD+N = 1% j Micropower shutdown current j PSRR ( @ 1k Hz, VDD = 5V, (Fig.1)) 1.2W (typ) 0.1µA (typ) 62d B (typ) Features n n n n n n n Fully differential input and output Internal gain set: 6d B, 10d B, 15.6d B, and 21.6d B Improved ’click and pop’ suppression Thermal shutdown protection circuit Ultra low current micropower shutdown mode 3.0V to 5.5V operation Available in space-saving exposed-DAP TSSOP package Key Specifications j BTL output power Applications 2.1W (typ) 1.9W (typ) n Notebook puters n PDAs n Portable electronic devices RL = 3Ω, VDD = 5.0V, and THD+N = 1% j BTL output power RL = 4Ω, VDD = 5.0V, and THD+N = 1% Connection Diagram Top View Order Number LM4874MH See NS Package Number MXA20A for Exposed-DAP TSSOP Boomer ® is a registered trademark of National Semiconductor Corporation. © 2002 National Semiconductor Corporation DS200469 .national. Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit .national. Absolute Maximum Ratings 3) (Notes 2, Infrared (15 sec.) 220˚C If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage...