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LM49352 Datasheet(PDF) 40 Page - Texas Instruments |
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LM49352 Datasheet(HTML) 40 Page - Texas Instruments |
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40 / 106 page  10 pF Speaker Ferrite Bead LSGND LM49352 Class D LS- LS+ 10 pF Ferrite Bead LM49352 SNAS467E – MARCH 2009 – REVISED MARCH 2013 www.ti.com Figure 59. EMI/RFI Filter for the Class D Amplifier Table 16. LEFT HEADPHONE_OUTPUT (0x11h) Bits Field Description 0 DACR_HPL The right DAC output is added to the left headphone output. 1 DACL_HPL The left DAC output is added to the left headphone output. 2 RSVD Reserved 3 RSVD Reserved 4 MONO_HPL The MONO input is added to the left headphone output. 5 AUX_HPL The AUX input is added to the left headphone output. Table 17. RIGHT HEADPHONE_OUTPUT (0x12h) Bits Field Description 0 DACR_HPR The right DAC output is added to the right headphone output. 1 DACL_HPR The left DAC output is added to the right headphone output. 2 RSVD Reserved 3 RSVD Reserved 4 MONO_HPR The MONO input is added to the right headphone output. 5 AUX _HPR The AUX input is added to the right headphone output. Headphone Amplifier Function The LM49352 headphone amplifier features TI’s ground referenced architecture that eliminates the large DC- blocking capacitors required at the outputs of traditional headphone amplifiers. A low-noise inverting charge pump creates a negative supply (HP_VSS) from the positive supply voltage (LS_VDD). The headphone amplifiers operate from these bipolar supplies, with the amplifier outputs biased about GND, instead of a nominal DC voltage (typically VDD/2), like traditional amplifiers. Because there is no DC component to the headphone output signals, the large DC-blocking capacitors (typically 220 μF) are not necessary, conserving board space and system cost, while improving frequency response. Charge Pump Capacitor Selection Use low ESR ceramic capacitors (less than 100m Ω) for optimum performance. Charge Pump Flying Capacitor (C6) The flying capacitor (C6) affects the load regulation and output impedance of the charge pump. A C6 value that is too low results in a loss of current drive, leading to a loss of amplifier headroom. A higher valued C6 improves load regulation and lowers charge pump output impedance to an extent. Above 2.2 μF, the RDS(ON) of the charge pump switches and the ESR of C6 and C5 dominate the output impedance. A lower value capacitor can be used in systems with low maximum output power requirements. Please refer to the demonstration board schematic shown in Figure 72. 40 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: LM49352 |
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