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參數資料
| 型號： | DS4201 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | 消費家電 |
| 英文描述： | USB Audio DAC(USB音頻數模轉換器) |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP28 |
| 封裝： | 0.600 INCH, DIP-28 |
| 文件頁數： | 3/22頁 |
| 文件大小： | 178K |
| 代理商： | DS4201 |
DS4201
060898 3/22
SIGNAL SUMMARY
Cont’d
SIGNAL NAME
TYPE
FUNCTION
RAUX
I
Auxiliary right channel analog input to the analog output mixer.
LAUX
I
Auxiliary left channel analog input to the analog output mixer.
ROUT
O
Right channel analog audio output from the mixer, 0.5 V
RMS
or 1.0 V
RMS
centered
about V
REF
.
LOUT
O
Left channel analog audio output from the mixer, 0.5 V
RMS
or 1.0 V
RMS
centered
about V
REF
.
VCM
O
DC bias point to which all AC coupled inputs are centered. Nominally V
REF
= 0.4 x
VA.
VREFI
I
Filter capacitor connection for internal voltage reference node. Connect a 10
μ
F and
0.1
μ
F capacitor to V
REFI
, very close to the pin, for best operation.
VA
I
Power supply input for analog functions. Range: 3.0 – 5.5V.
VD
I
Power supply input for digital functions. Range: 3.0 – 5.5V.
VB
I
USB I/F power supply input. Range: 3.0 – 3.6V.
DGND
I
Digital ground.
AGND
I
Analog ground.
X1I
I
Crystal 1 input. Use a 12.0 MHz, fundamental mode, parallel resonant crystal. A 12.0
MHz CMOS clock source may also be used.
X1O
O
Crystal 1 output. Connect to other side of crystal 1 if used.
X2I
I
Crystal 2 input. Use a 12.288 MHz, fundamental mode, parallel resonant crystal. A
12.288 MHz CMOS clock source may also be used.
X2O
O
Crystal 2 output. Connect to other side of crystal 2 if used.
NC
No connect. Leave these pins unconnected.
DS4201 OPERATION
Operation of the DS4201 is described per the block dia-
gram of Figure 2 and is divided into six sections:
– USB DEVICE
– USB TRANSCEIVER
– VOLTAGE REFERENCE
– ANALOG I/O
– POWER CONTROL
– OSCILLATORS
The following sections provide details regarding the
operation of each of these elements. Additionally,
APPENDIX C provides recommended connection
information.
USB defined descriptors are passed to the host from the
DS4201; these are used to communicate what capabili-
ties and features are supported by the DS4201 as well
as device characteristics. Contact Dallas Semiconduc-
tor for additional device descriptor documentation.
USB DEVICE OPERATION
As shown in Figure 1 and Figure 2, within the USB
Device block resides the sigma–delta D/A converter for
audio data playback, level adjustments for the D/A,
microphone, and auxiliary signal paths, and mixing of
the three signal channels to a single line output channel.
Organization and control of these elements as well as
the interface to the host controller in an USB Audio
Device Class (ADC) framework is shown in Figure 3.
This structure provides all the capabilities for the host
system to communicate with and operate the various
features within the DS4201. As shown in Figure 3, the
DS4201 USB device structure will consist of one default
device configuration, one AUDIO CONTROL interface,
and one AUDIO STREAMING interface. The details of
these interfaces are provided in the following para-
graphs.
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