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參數(shù)資料
| 型號： | DS4201 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | 消費家電 |
| 英文描述： | USB Audio DAC(USB音頻數(shù)模轉(zhuǎn)換器) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
| 封裝： | 0.600 INCH, DIP-28 |
| 文件頁數(shù)： | 9/22頁 |
| 文件大?。?/td> | 178K |
| 代理商： | DS4201 |
DS4201
060898 9/22
NOTE:
USB core specification power requirements
must be considered for any power configuration that
consumes power from the USB bus.
Power Management
The power management features of the DS4201 are
used to control device and external circuit power con-
sumption whenever a USB suspend state is entered;
the suspend power mode (SPM) input and suspend out-
put (SUSO\) signals are used for this control.
Suspend Power Mode
The DS4201 supports two modes of operation when the
USB enters a suspend state; the suspend power mode
input signal (SPM) is used to select which of the two
modes the device will enter upon suspend. When the
suspend state is entered, the SPM input level is used to
selectively shut down specific DS4201 circuitry. Power
consumption during the USB suspended state for the
two suspend power modes and various input voltage
conditions are listed in the DC Characteristics Table and
are summarized in the following table and paragraphs:
SUSPEND POWER STATES
Table 4
BUS STATE
SPM
POWER CONSUMPTION
Active
X
Active
Suspended
1
Reduced from active
Suspended
0
Minimum
When SPM=1 and the USB enters a suspend state, the
DS4201 DAC and oscillators are powered down and
digital circuitry enters a low power static state. All other
analog circuitry remains powered so that the signal
paths for the AUX and MIC inputs are active.
When SPM=0 and the USB enters a suspend state,
power consumption is minimized. For this state\mode,
all analog circuitry and oscillators are powered down
and digital circuitry enters a low power static state.
NOTE:
For this state\mode the analog circuitry in the
AUX and MIC paths are powered down and analog
audio playback over the AUX and MIC channels will be
turned off until the USB returns to an active state.
Therefore it is recommended that the AUX and MIC
inputs not be made available for analog input playback
in an application where SPM=0.
Suspend Output
Whenever the USB enters a suspend state the DS4201
suspend output signal (SUSO) is driven low. This signal
could be used stand–alone or combined with other
external signals to power down circuitry external to the
DS4201, such as amplifiers and power sources, to man-
age audio system power consumption during periods of
inactivity. The SUSO signal is an open drain output and
requires an external pull–up to a positive supply no
greater than 6.0V.
OSCILLATORS
The DS4201 requires two clock sources to operate:
12.0 MHz and 12.288 MHz. Crystals or CMOS crystal
oscillators may be used to provide the clock sources.
For crystals, use parallel resonant, fundamental mode
with a CL specification between 10 pF and 20 pF at the
required frequency. Parallel loading capacitors with a
value of approximately twice CL are also required. The
connection scheme shown in APPENDIX C should be
used.
For external CMOS crystal oscillators, make a connec-
tion directly to the DS4201 X1I and/or X2I inputs. The
X1O and X2O outputs must be left floating for this
arrangement.
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