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LM4947 Datasheet(PDF) 26 Page - Texas Instruments |
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LM4947 Datasheet(HTML) 26 Page - Texas Instruments |
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LM4947 C3DR C3DL C3DL C3DR (internal resistors) LM4947, LM4947TLEVAL SNAS349D – JUNE 2006 – REVISED MAY 2013 www.ti.com Table 5. Output Volume Control Table (continued) Volume Step xVC4 xVC3 xVC2 xVC1 xVC0 Gain, dB 25 1 1 0 0 0 7.50 26 1 1 0 0 1 9.00 27 1 1 0 1 0 10.50 28 1 1 0 1 1 12.00 29 1 1 1 0 0 13.50 30 1 1 1 0 1 15.00 31 1 1 1 1 0 16.50 32 1 1 1 1 1 18.00 Table 6. Output Mode Selection Output Mode MC2 MC1 MC0 Handsfree Mono Output Right HP Output Left HP Output Number 0 0 0 0 SD SD SD 1 0 0 1 2 x GM x M MUTE MUTE 2 0 1 0 SD GM x M GM x M 3 0 1 1 GL x L + GR x R MUTE MUTE 4 1 0 0 SD GR x R GL x L 5 1 0 1 GL x L + GR x R + 2(GM x M) MUTE MUTE 6 1 1 0 SD GR x R + GM x M GL x L + GM x M 7 1 1 1 GR x R + GL x L GR x R GL x L TI 3D ENHANCEMENT The LM4947 features a stereo headphone, 3D audio enhancement effect that widens the perceived soundstage from a stereo audio signal. The 3D audio enhancement creates a perceived spatial effect optimized for stereo headphone listening. The LM4947 can be programmed for a “narrow” or “wide” soundstage perception. The narrow soundstage has a more focused approaching sound direction, while the wide soundstage has a spatial, theater-like effect. Within each of these two modes, four discrete levels of 3D effect that can be programmed: low, medium, high, and maximum (Table 2), each level with an ever increasing aural effect, respectively. The difference between each level is 3dB. The external capacitors, shown in Figure 88, are required to enable the 3D effect. The value of the capacitors set the cutoff frequency of the 3D effect, as shown by Equation 1 and Equation 2. Note that the internal 20k Ω resistor is nominal (±25%). Figure 88. External 3D Effect Capacitors f3DL(-3dB) = 1 / 2π * 20kΩ * C3DL (1) f3DR(-3dB) = 1 / 2π * 20kΩ * C3DR (2) Optional resistors R3DL and R3DR can also be added (Figure 89) to affect the -3dB frequency and 3D magnitude. 26 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LM4947 LM4947TLEVAL |
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