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LM4947 Datasheet(PDF) 26 Page - Texas Instruments

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Part No. LM4947
Description  Mono Class D and Stereo Audio Sub-System
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

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
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
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Copyright © 2006–2013, Texas Instruments Incorporated
Product Folder Links: LM4947 LM4947TLEVAL


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