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TPA6138A2PW 데이터시트(PDF) 9 Page - Texas Instruments |
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TPA6138A2PW 데이터시트(HTML) 9 Page - Texas Instruments |
9 / 22 page OPAMP Co Mute Circuit Output Enable + + + – Conventional Solution Mute Circuit Output Enable 3.3 V + – TPA6138A2 Solution VDD VSS GND VDD VDD/2 GND DirectPath™ 9 V–12 V TPA6138A2 www.ti.com SLOS704B – JANUARY 2011 – REVISED AUGUST 2015 Feature Description (continued) Figure 7. 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. The DirectPath amplifier requires no output dc-blocking capacitors. The bottom block diagram and waveform of Figure 7 show the ground-referenced line- driver architecture. This is the architecture of the TPA6138A2. 9.4 Device Functional Modes 9.4.1 Mute Operation The TPA6138A2 is able to turn off the output transistors by asserting to low level the Mute pin. This option is useful when an idle state is needed. 9.4.2 Using the TPA6138A2 as a Second-Order Filter Several audio DACs used today require an external low-pass filter to remove out-of-band noise. This is possible with the TPA6138A2, as it can be used like a standard OPAMP. Several filter topologies can be implemented, both single-ended and differential. In Figure 8, a multi-feedback (MFB) topology with differential input and single- ended input is shown. An ac-coupling capacitor to remove dc content from the source is shown; it serves to block any dc content from the source and lowers the dc gain to 1, helping to reduce the output dc offset to a minimum. To calculate the component values, use the TI WEBENCH® Filter Designer (www.ti.com/filterdesigner) Copyright © 2011–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: TPA6138A2 |
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