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LM4819 Datasheet(PDF) 9 Page - Texas Instruments |
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LM4819 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 28 page LM4819, LM4819MBD www.ti.com SNAS133C – MAY 2004 – REVISED OCTOBER 2004 Typical Performance Characteristics (continued) Power Dissipation vs Power Dissipation vs Output Power Output Power VDD = 5V VDD = 3V Frequency Response vs Power Derating Curves Input Capacitor Size Supply Current vs Supply Voltage Application Information BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1, the LM4819 consist of two operational amplifiers. External resistors, Ri and RF set the closed-loop gain of the first amplifier (and the amplifier overall), whereas two internal 20k Ω resistors set the second amplifier's gain at -1. The LM4819 is typically used to drive a speaker connected between the two amplifier outputs. Figure 1 shows that the output of Amp1 servers as the input to Amp2, which results in both amplifiers producing signals identical in magnitude but 180° out of phase. Taking advantage of this phase difference, a load is placed between V01 and V02 and driven differentially (commonly referred to as "bridge mode"). This results in a differential gain of AVD= 2 *(Rf/Ri) (1) Copyright © 2004, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM4819 LM4819MBD |
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