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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)： | 5/22頁 |
| 文件大?。?/td> | 178K |
| 代理商： | DS4201 |
DS4201
060898 5/22
AUDIO CONTROL Interface
The CONTROL interface is used by the USB host to
manipulate and monitor the operation of the DS4201.
Additionally, all features, control capabilities, and char-
acteristics of the DS4201 are communicated to the host
through USB descriptors over this interface. Host com-
munication with the CONTROL interface is performed
over a default control pipe at Endpoint 0
The USB Audio Device Class (ADC) specification
defines audio function units and terminals to describe
and operate a USB Audio device; the Endpoint 0 default
control pipe is used to control the units and terminals.
USB operation of the DS4201 Audio device is controlled
through Feature Units (FU), a Mixer Unit (MU), Input
Terminals (IT), an Extension Unit (XU), and an Output
Terminal (OT) as shown in Figure 3. The Input Terminal
associated with the STREAMING INTERFACE makes
a logical connection to the isochronous data pipe feed-
ing PCM coded data to the DS4201 at Endpoint 1. The
DS4201 performs D/A processing of the incoming digi-
tal PCM data at this point and thus the output from this
Input Terminal is a logical cluster of analog audio signals
consisting of the left and right audio channels. The
Input Terminals associated with the Auxiliary (AUX) and
Microphone (MIC) inputs are for connection to the ana-
log line inputs; the output from these terminals are log-
ical clusters of the respective analog audio input source.
The three Feature Units (FU) provide Mute capability for
the three analog audio clusters. The Extension Unit
(XU) provides a DS4201 specific control capability
which can be used to select between two output level
ranges from the sigma–delta D/A converter. The Mixer
Unit (MU) provides control for level setting and mixing of
the three analog audio clusters; the control capability
consists of gain or attenuation to the incoming analog
signals prior to mixing the left and right composite chan-
nels.
Input Terminals
The ADC Input Terminal (IT) is used to receive audio
information into the audio function. It also converts the
incoming audio stream into the separate logical chan-
nels embedded. USB OUT endpoints as well as analog
audio inputs are supported. The DS4201 uses three
ITs: IT:TID1 connects to Endpoint 1 carrying a USB iso-
chronous audio stream, IT:TID2 connects to the analog
AUX input, and IT:TID3 connects to the analog MIC
input.
Extension Unit
The Extension Unit (XU) is used to add vendor specific
features to a USB audio function. The XU in the
DS4201, XU:UID9, is used to select between two avail-
able output ranges for the sigma–delta DAC: 1.414 VPP
or 2.828 V
PP
. The XU control parameter, OUT-
PUT_DOUBLE_CONTROL, is used to select or enable
the output range mode. When set TRUE, the 2.828 V
PP
range is selected; when FALSE, the 1.414 V
PP
range is
selected. When the DS4201 is operating from a 3V
power source, the 1.414 V
PP
range must be selected.
For 5V operation, either range can be used. The com-
mand and control parameter used for the XU SET/GET
request is defined in APPENDIX A.
Extension Unit Default Setting
The power–on default setting of the XU is:
OUTPUT_DOUBLE_SELECTOR = FALSE
(DAC output range = 1.414 V
PP
)
Feature Units
As defined by the ADC specification, the Feature Unit
(FU) provides basic property control of an audio signal.
The FU descriptor reports what controls exist for each
channel that passes through the FU as well as a master
control. All FUs have a single input and output pin for the
audio cluster being controlled. The audio cluster can
contain multiple logical channels (left, right, etc.) which
are individually or group controlled by FU commands.
As shown in Figure 3, FU:UID5 operates on the cluster
from XU:UID9, FU:UID6 operates on the cluster from
IT:TID2, and FU:UID7 operates on the cluster from
IT:TID3. Table 1 lists the cluster channels and proper-
ties supported by each FU. As shown in the table,
MUTE is the only control property supported by the
DS4201 FUs. FU commands are documented in
APPENDIX A.
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