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LM49352 Scheda tecnica(PDF) 41 Page - Texas Instruments |
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LM49352 Scheda tecnica(HTML) 41 Page - Texas Instruments |
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41 / 106 page  LM49352 www.ti.com SNAS467E – MARCH 2009 – REVISED MARCH 2013 Charge Pump Flying Capacitor (C5) The value and ESR of the hold capacitor (C5) directly affects the ripple on CPVSS. Increasing the value of C5 reduces output ripple. Decreasing the ESR of C5 reduces both output ripple and charge pump 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. Table 18. AUX_OUTPUT (0x13h) Bits Field Description 0 DACR_AUX The right DAC output is added to the AUX output. 1 DACL_AUX The left DAC output is added to the AUX output. 2 MIC_AUX The MIC input is added to the AUX output. 3 RSVD Reserved 4 MONO_AUX The MONO input is added to the AUX output. 5 AUX_AUX The AUX input is added to the AUX output. Auxiliary Output Amplifier The LM49352’s auxiliary output (AUXOUT) amplifier provides differential drive capability to loads that are connected across its outputs. This results in output signals at the AUX_OUT+ and AUX_OUT- pins that are 180 degrees out of phase with respect to each other. This effectively doubles the maximum possible output swing for a specific supply voltage when compared to single-ended output configurations. The differential output configuration also allows the load to be isolated from ground since both the AUX_OUT+ and AUX_OUT- pins are biased at the same DC potential. This eliminates the need for any large and expensive DC blocking capacitors at the AUXOUT amplifier outputs. The load can then be directly connected to the positive and negative outputs of the AUXOUT amplifier which then isolates it from any ground noise, thereby improving signal to noise ratio (SNR) and power supply rejection ratio (PSRR). The AUXOUT amplifier has two modes of operation. The primary mode of operation is high current drive mode (Earpiece Mode) where the AUXOUT amplifier can be used to differentially drive a mono earpiece speaker. The secondary mode of operation is low current drive mode where the AUXOUT amplifier operates in a power saving mode (AUX_LINE_OUT Mode) to provide a differential output that is used as a mono differential line level input to a standalone mono differential input class D amplifier (LM4675) for stereo loudspeaker applications. Table 19. OUTPUT_OPTIONS (0x14h) Bits Field Description 0 RSVD Reserved This sets the gain of the left and right headphone amplifiers. The gain of the left and right headphone amplifiers are always set to the same level. LR_HP_LEVEL Gain (dB) 000 0 001 –1.5 010 –3 3:1 LR_HP_LEVEL 011 –6 100 –9 101 –12 110 –15 111 –18 This sets the gain of the Auxiliary output amplifier. AUX_NEG_6dB Gain (dB) 4 AUX_NEG_6dB 0 0 1 –6 Copyright © 2009–2013, Texas Instruments Incorporated Submit Documentation Feedback 41 Product Folder Links: LM49352 |
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