PCM3793A
PCM3794A
www.ti.com
SLAS529A–JANUARY 2007–REVISED FEBRUARY 2007
Register 71
B15
0
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
DFQ0
Register 71
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
RSV
RSV
RSV
SPSE
SPS1
SPS0
DFQ1
IDX[6:0]: 100 0111b (47h): Register 71
SPSE: Enable of Spectrum Spreading
Default value: 0
The class-D speaker amplifier output can cause RF interference due to switching noise. The PCM3793A can
reduce peak noise by the use of spectrum spreading technology when SPSE = 1.
SPSE = 0
SPSE = 1
Disable (default)
Enable
SPS[1:0]: Spectrum Spreading Efficiency
Default value: 00
The spectrum-spreading efficiency of can be selected from low, medium, and high.
SPS[1:0]
Spectrum Spreading Efficiency
00
01
10
11
Low (default)
Medium
High
Reserved
DFQ[1:0]: Switching Frequency for Speaker Amplifier (Class-D)
Default value: 00
The switching frequency of the class-D speaker amplifier can be selected to avoid interference with other
equipment.
DFQ[1:0]
Class D Amplifier Switching Frequency
00
01
10
11
1.5 MHz (default)
2.25 MHz
2.65 MHz
3 MHz
Register 72
B15
0
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
Register 72
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
RSV
RSV
RSV
RSV
RSV
RSV
PMXR
PMXL
IDX[6:0]: 100 1000b (48h) Register 72
PMXR: Power Up/Down for MXR (Mixer R-Channel)
PMXL: Power Up/Down for MXL (Mixer L-Channel)
Default value: 0
These bits are used to control power up/down for the analog mixer.
PMXL, PMXR = 0
PMXL, PMXR = 1
Power down (default)
Power up
36
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