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TPA6139A2PWR Fiches technique(PDF) 9 Page - Texas Instruments |
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TPA6139A2PWR Fiches technique(HTML) 9 Page - Texas Instruments |
9 / 22 page OPAMP Co Mute Circuit Output MUTE 9-12 V + + + - TPA6139A2 Output 3.3 V - Conventional solution TPA 6139 A 2 Solution VDD VSS GND VDD VDD/2 GND DirectPath MUTE TPA6139A2 www.ti.com SLOS700B – JANUARY 2011 – REVISED JUNE 2012 APPLICATION INFORMATION LINE DRIVER AMPLIFIERS Single-supply line-driver amplifiers typically require dc-blocking capacitors. The top drawing in Figure 9 illustrates the conventional line-driver amplifier connection to the load and output signal. DC blocking capacitors are often large in value, and a mute circuit is needed during power up to minimize click and pop. The output capacitor and mute circuit consume PCB area and increase cost of assembly, and can reduce the fidelity of the audio output signal. Figure 9. Conventional and DirectPath Line Driver The DirectPath™ amplifier architecture operates from a single supply but makes use of an internal charge pump to provide a negative voltage rail. Combining the user-provided positive rail and the negative rail generated by the IC, the device operates in what is effectively a split supply mode. The output voltages are now centered at zero volts with the capability to swing to the positive rail or negative rail. Combining this with the built-in click and pop reduction circuit, the DirectPath™ amplifier requires no output dc blocking capacitors. The bottom block diagram and waveform of Figure 9 illustrate the ground-referenced line-driver architecture. This is the architecture of the TPA6139A2. Copyright © 2011–2012, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s) :TPA6139A2 |
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