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參數(shù)資料
| 型號： | PCM4108 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | HIGH-PERFORMANCE, 24-BIT, 216kHz SAMPLING, EIGHT-CHANNEL AUDIO DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 高性能，24位，216kHz的最大采樣，八聲道音頻數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 24/39頁 |
| 文件大?。?/td> | 551K |
| 代理商： | PCM4108 |
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SBAS354 JUNE 2005
www.ti.com
24
STANDALONE MODE CONFIGURATION
Standalone mode is selected by forcing the MODE input
(pin 12) low. Standalone mode operation provides a
subset of the functions available in Software mode, while
providing an option for a simplified control model.
Standalone configuration is accomplished by either
hardwiring or driving a small set of input pins with external
logic or switches. Standalone mode functions include
sampling mode and audio data format selection, an
all-channel soft mute function, and digital de-emphasis
filtering. The following paragraphs provide a brief
description of each function available when using
Standalone mode.
Sampling Mode
The sampling mode is selected using the FS0 (pin 36) and
FS1 (pin 37) inputs. A more detailed discussion of the
sampling modes was provided in an earlier section of this
data sheet. Table 2 summarizes the sampling mode
configuration for Standalone mode.
Table 2. Sampling Mode Configuration
FS1
FS0
SAMPLING MODE
0
0
Single Rate
0
1
Dual Rate
1
0
Quad Rate
1
1
Not Used
Audio Data Format
The audio data format is selected using the FMT0 (pin 33),
FMT1 (pin 34), and FMT2 (pin 35) inputs. A detailed
discussion of the audio serial port operation and the
corresponding data formats was provided in the Audio
Serial Port section on pages 20 through 23. For
Standalone mode, the LRCK polarity is always normal,
while the serial audio data is always sampled on the rising
edge of the BCK clock. Table 3 shows the audio data
format configuration for Standalone mode.
Table 3. Audio Data Format Configuration
FMT2
0
FMT1
0
FMT0
0
AUDIO DATA FORMAT
24-bit, left-justified
24-bit I2S
0
0
1
0
1
0
TDM with zero BCK delay
0
1
1
TDM with one BCK delay
1
0
0
24-bit, right-justified
1
0
1
20-bit, right-justified
1
1
0
18-bit, right-justified
1
1
1
16-bit, right-justified
Soft Mute Function
The MUTE input (pin 14) may be used in either the
Standalone or Software modes to simultaneously mute the
eight output channels. The soft mute function slowly ramps
the digital output attenuation from its current setting to the
mute level, minimizing or eliminating audible artifacts.
Table 4 summarizes MUTE function operation.
Table 4. Mute Function Configuration
MUTE
ANALOG OUTPUTS
0
On (mute disabled)
1
Muted
Digital De-Emphasis
This is a global digital function (common to all eight
channels) and provides de-emphasis of the higher
frequency content within the 20kHz audio band.
De-emphasis is required when the input audio data has
been pre-emphasized. Pre-emphasis entails increasing
the amplitude of the higher frequency components in the
20kHz audio band using a standardized filter function in
order to enhance the high-frequency response. The
PCM4108 de-emphasis filters implement the standard
50/15
μ
s de-emphasis transfer function commonly used in
digital audio applications.
De-emphasis filtering is available for three input sampling
frequencies in Single Rate sampling mode: 32kHz,
44.1kHz, and 48kHz. De-emphasis is not available when
operating in Dual or Quad Rate sampling modes. The
de-emphasis filter is selected using the DEM0 (pin 16) and
DEM1 (pin 15) inputs. Table 5 illustrates the de-emphasis
filter configuration for Standalone mode.
Table 5. Digital De-Emphasis Configuration
DEM1
DEM0
DIGITAL DE-EMPHASIS MODE
0
0
Off (de-emphasis disabled)
0
1
48kHz
1
0
44.1kHz
1
1
32kHz
P
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| PCM4108CPAPR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH-PERFORMANCE, 24-BIT, 216kHz SAMPLING, EIGHT-CHANNEL AUDIO DIGITAL-TO-ANALOG CONVERTER |
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| PCM4108PAPR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH-PERFORMANCE, 24-BIT, 216kHz SAMPLING, EIGHT-CHANNEL AUDIO DIGITAL-TO-ANALOG CONVERTER |
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