PCM1738E2K BURR-BROWN [Burr-Brown Corporation], PCM1738E2K Datasheet - Page 21

• Manufacturer Part Number: PCM1738E2K
• Description: 24-Bit, 192kHz Sampling, Advanced Segment, Audio-Stereo DIGITAL-TO-ANALOG CONVERTER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

PCM1738
REGISTER 20
DFTH
MONO
CHSL
OS[1:0]
SBAS174B
Monaural Mode Selection
Channel Selection for Monaural Mode
This bit is Read/Write.
Default Value: 0
This bit is available when MONO = 1.
The CHSL bit is used to set the audio data selection for the monaural mode.
Digital Filter Bypass (or Through Mode) Control
This bit is Read/Write.
Default Value: 0
The DFTH bit is used to enable or bypass the internal digital filter. This function is used when using the external
digital-filter interface or the DSD mode interface.
This bit is Read/Write.
Default Value: 0
The MONO function is used to change the operation mode from normal stereo mode to monaural mode. When
the monaural mode is selected, both DACs operate in balanced mode for the selected audio input data. Left and
Right channel data selection is set by the CHSL bit, as described below.
Delta-Sigma Oversampling Rate Selection
These bits are available for Read/Write.
Default Value: 00
For DSD mode, this register is used to select the speed of BCK (pin 7) for the Analog FIR filter.
The OS bits are used to change the oversampling ratio of the delta-sigma modulator. This function is useful when
considering the output low-pass filter design that can handle a wide range of sampling rates. As an example,
selecting 128x for f
pass filter with a single cutoff frequency to accommodate all three sampling rates.
DFTH = 0
DFTH = 1
MONO = 0
MONO = 1
CHSL = 0
CHSL = 1
OS[1:0]
(Cont.)
00
01
10
11
Digital Filter Enabled (default)
Digital Filter Bypassed for Either External Digital Filter or DSD Mode
Stereo Mode (default)
Monaural Mode
Operation Speed Select
64x (default)
Reserved
128x
32x
S
L-Channel Selected (default)
R-Channel Selected
= 44.1kHz, 64x for f
S
= 96kHz, and 32x for f
S
= 192kHz operation would require a low-
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