PCM3793A
PCM3794A
www.ti.com
Register 70
Register 70
SLAS529A–JANUARY 2007–REVISED FEBRUARY 2007
B15
0
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
DEM1
DEM0
PFM1
PFM0
SPX1
SPX0
RSV
OVER
IDX[6:0]: 100 0110b (46h): Register 70
DEM[1:0]: De-Emphasis Filter Selection
Default value: 00
A digital de-emphasis filter is in front of the interpolation filter. One of three de-emphasis filters can be selected
corresponding to thesampling rate, 32 kHz, 44.1 kHz, or 48 kHz.
DEM[1:0]
De-Emphasis Filter Selection
00
01
10
11
OFF (default)
32 kHz
44.1 kHz
48 kHz
PFM[1:0]: Audio Interface Selection for DAC (Digital Input)
Default value: 00
The audio interface for the DAC digital input has I2S, right-justified, left-justified, and DSP formats.
PFM[1:0]
Audio Interface Selection for DAC Digital Input
I2S format (default)
00
01
10
11
Right-justified format
Left-justified format
DSP format
SPX[1:0]: Digital Gain Control for DAC Input
Default value: 00
These bits are used to gain up the digital input data.
SPX[1:0]
Digital Gain Control for DAC input
00
01
10
11
0 dB (default)
6 dB
12 dB
18 dB
OVER: Oversampling Control for Delta-Sigma DAC
Default value: 0
This bit is used to control the oversampling rate of delta-sigma DAC. When the PCM3793A/94A operates at low
sampling rates (less than 24 kHz) and the SCKI frequency is less than 12.5 MHz, OVER = 1 is recommended.
OVER = 0
OVER = 1
128 fS (default)
192 fS, 256 fS, 384 fS
35
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