PCM3793A Datasheet, PDF (35/68 Pages) Burr-Brown (TI) – 16-Bit, Low-Power Stereo Audio CODEC With Microphone Bias, Headphone, and Digital Speaker Amplifier

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PCM3793A
PCM3794A
SLAS529A – JANUARY 2007 – REVISED FEBRUARY 2007
Register 70
Register 70
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
0
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]
00
01
10
11
De-Emphasis Filter Selection
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]
00
01
10
11
Audio Interface Selection for DAC Digital Input
I²S format (default)
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]
00
01
10
11
Digital Gain Control for DAC input
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 f_S (default)
192 f_S, 256 f_S, 384 f_S
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