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PDF DS4201 Data sheet ( Hoja de datos )

Número de pieza DS4201
Descripción USB Audio DAC
Fabricantes Dallas Semiconducotr 
Logotipo Dallas Semiconducotr Logotipo



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No Preview Available ! DS4201 Hoja de datos, Descripción, Manual

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FEATURES
§ Fully USB Core Class v1.0 Compliant
§ Fully USB Audio Device Class v1.0
Compliant
§ Complete Stereo DAC System
§ 16–bit Σ∆ DAC
§ Analog Post Filter
§ 44.1 KHz, 48 KHz Sampling Rates
§ >80 dB S/N DAC Performance
§ Audio System Power Management
§ 8 and 16–Bit PCM Digital Data Formats
§ Integrated USB Compliant Transceiver
§ High Rate 12 Mbps USB Interface
§ Analog Output Mixing for Auxiliary Inputs
§ Multiple Power Configurations Including
Completely USB Powered
§ 3.3V – 5.0V Operating Range
ORDERING INFORMATION
Part Number
Description
DS4201
28-pin DIP
DS4201F
44-pin QFP
DS4201
USB Audio DAC
PIN ASSIGNMENT
VD
NC
NC
DGND
SPM
X2I
X2O
DGND
X1I
X1O
VB
D-
D+
DGND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 NC
27 NC
26 NC
25 SUSO
24 VCM
23 VREFI
22 VA
21 AGND
20 LOUT
19 ROUT
18 LMIC
17 RMIC
16 LAUX
15 RAUX
28-PIN DIP 600 MIL
44
1
ALE
WR
RLINK
RLCLK
DVSS
RCLK
RCHCLK
RSER
RSYNC
RLOS/LOTC
SYSCLK
11
12
34
33
NC
NC
VCM
NC
VREGI
VA
NC
AGND
LOUT
NC
ROUT
23
22
44-PIN QFP (10mm x 10mm)
DESCRIPTION
The DS4201 Universal Serial Bus (USB) audio device is a complete interface solution for USB based PC
digital audio playback. Integrating a USB device core, stereo 16–bit sigma–delta DAC and fixed function
DSP processing, as shown in Figure 1, the DS4201 is designed specifically for USB digital speaker
implementations. Digital–to–analog audio data processing supports 8 and 16–bit PCM stereo/mono
formats at 44.1 KHz and 48.0 KHz sampling rates. Additionally, analog output mixing of line and
microphone inputs provide legacy and hybrid speaker capabilities.
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DS4201 pdf
USB DEVICE STRUCTURE Figure 3
DS4201
NOTE:
For the audio streaming interface alternate setting which selects adaptive synchronization, the
isochronous synch pipe at endpoint 2 (EP2) does not exist.
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 characteristics of the DS4201 are
communicated to the host through USB descriptors over this interface. Host communication 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 feeding PCM coded data to the DS4201 at Endpoint 1. The DS4201
performs D/A processing of the incoming digital 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 analog line inputs; the output from these terminals are logical 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
channels.
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 channels 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 isochronous audio stream, IT:TID2 connects to the analog AUX input, and IT:TID3
connects to the analog MIC input.
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DS4201 arduino
DS4201
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
output (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
Active
X
Suspended
1
Suspended
0
POWER CONSUMPTION
Active
Reduced from active
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 manage 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.
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