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參數資料
| 型號： | PCM4104PFBT |
| 英文描述： | High-Performance, 24-Bit, 216kHz sampling, Four-channel Audio Digital-to-Analog Converter |
| 中文描述： | 高性能24位，216kHz的采樣，四通道音頻數字模擬轉換器 |
| 文件頁數： | 18/36頁 |
| 文件大小： | 486K |
| 代理商： | PCM4104PFBT |
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SBAS291C AUGUST 2003 REVISED DECEMBER 2004
www.ti.com
18
POWER-DOWN OPERATION
The PCM4104 can be forced to a power-down state by
applying a low level to the RST input for a minimum of
65,536 system clock cycles. In power-down mode, all
internal clocks are stopped, and analog outputs are set to
a high-impedance state. The system clock can then be
removed to conserve additional power. In the case of
system clock restart when exiting the power-down state,
the clock should be restarted prior to a low-to-high
transition of the reset signal at the RST input. The
low-to-high transition of the reset signal initiates a reset
sequence, as described in the Reset Operation section of
this data sheet.
In Software mode, two additional power-down controls are
provided. The PDN12 and PDN34 bits are located in
Control Register 6 and
may be used to power-down
channel pairs, with PDN12 corresponding to channels 1
and 2, and PDN34 corresponding to channels 3 and 4.
This allows the user to conserve power when a channel
pair is not in use. The power-down function is the same as
described in the previous paragraph for the corresponding
channel
pair.
Unlike
the
implemented using the RST input, setting a power-down
bit will immediately power down the corresponding
channel pair.
power-down
function
When exiting power-down mode, either by forcing the RST
input high or by setting the PDN12 or PDN34 bits low, the
analog outputs will transition from the high-impedance
state to the mute state, with the output level set to the
bipolar zero voltage. There may be a small transient
created by this transition, since internal capacitor charge
can initially force the output to a voltage above or below
bipolar zero, or external circuitry can pull the outputs to
some other voltage level. Figure 8 illustrates the state of
the analog outputs before, during, and after a power-down
event.
Analog
Outputs
65,536
SCKI Periods
Outputs are On
Outputs are
Muted
RST
0V
V
DD
Analog
Outputs
1024
SCKI Periods
Required for
Initialization
1024
SCKI Periods
Required for
Initialization
Outputs are On
Outputs are On
Outputs are On
Outputs are
High Impedance
Outputs are
High Impedance
Outputs Transition
from High Impedance
to Muted State
Outputs Transition
from High Impedance
to Muted State
PDN12
PDN34
LO
HI
Outputs are On
Transitioning
to Driven State
Figure 8. Analog Output State for Power-Down Operations
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相關代理商/技術參數 |
參數描述 |
|---|---|
| PCM4104PFBTG4 | 功能描述:音頻數/模轉換器 IC High-End 24-Bit 192kHz 4-Ch D-S DAC RoHS:否 制造商:Texas Instruments 轉換器數量: 分辨率:16 bit 接口類型:I2S, UBS 轉換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
| PCM4108 | 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 |
| 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 |
| PCM4108CPAPT | 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 |
| 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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