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PCM1792 数据表(PDF) 41 Page - Texas Instruments

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部件名 PCM1792
功能描述  AUDIO STEREO DIGITAL-TO-ANALOG CONVERTER
Download  61 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

PCM1792 数据表(HTML) 41 Page - Texas Instruments

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PCM1792
SLES069B − MARCH 2003 − REVISED NOVEMBER 2006
www.ti.com
41
OS[1:0]: Delta-Sigma Modulator Oversampling Rate Selection
Default value: 00
OS[1:0]
Operation Speed Select
00
8 times WDCK (default)
01
4 times WDCK
10
16 times WDCK
11
Reserved
The effective oversampling rate is determined by the oversampling performed by both the external digital filter and
the delta-sigma modulator. For example, if the external digital filter is 8
× oversampling, and the user selects
OS[1:0] = 00, then the delta-sigma modulator oversamples by 8
×, resulting in an effective oversampling rate of 64×.
The 16
× WDCK oversampling rate is not available above a 100-kHz sampling rate. If the oversampling rate selected
is 16
× WDCK, the system clock frequency must be over 256 fS.
APPLICATION FOR DSD FORMAT (DSD MODE) INTERFACE
Bit Clock
DSD Decoder
DATA
5
6
7
BCK
SCK
ZEROL
1
2
3
4
ZEROR
MSEL
LRCK
PCM1792
DATA_R
DATA_L
Figure 43. Connection Diagram in DSD Mode
Feature
This mode is used for interfacing directly to a DSD decoder, which is found in Super Audio CD
t (SACD) applications.
The DSD mode is accessed by programming the following bit in the corresponding control register.
DSD = 1 (register 20)
The DSD mode provides a low-pass filtering function. The filtering is provided using an analog FIR filter structure.
Four FIR responses are available, and are selected by the DMF[1:0] bits of control register 18.
The DSD bit must be set before inputting DSD data; otherwise, the PCM1792 erroneously detects the TDMCA mode,
and commands are not accepted through the serial control interface.
Super Audio CD is a trademark of Sony Kabushiki Kaisha TA Sony Corporation, Japan.


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