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參數(shù)資料
| 型號： | DS4201 |
| 廠商： | DALLAS SEMICONDUCTOR |
| 元件分類： | 消費(fèi)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)： | 8/22頁 |
| 文件大?。?/td> | 178K |
| 代理商： | DS4201 |
DS4201
060898 8/22
USB TRANSCEIVER
Integrated within the DS4201 is a USB compliant bus
transceiver. To comply with USB cable termination
requirements, resistors external to the DS4201 must be
installed as shown in Figure 4. The 24 ohm, 1% toler-
ance resistors are necessary to bring the total steady
state resistance of each driver to the 28–43 ohms range
required by the USB core specification. The 1.5K ohms
pull–up resistor is required to identify the bus as high
speed USB.
TRANSCEIVER TERMINATION
Figure 4
D+
VB (VB = 3.3V
±
10%)
USB
TRANSCEIVER
1.5k
,
5%
DS4201
24
,
1%
24
,
1%
D–
TO/HIGH
SPEED
USB CABLE
VOLTAGE REFERENCE
The VREFI input is a connection to a filter node of the
internal voltage reference and is used to apply addi-
tional filtering of the reference to reduce noise. This is
accomplished by connecting both a 0.1
μ
F and 10
μ
F
capacitor across this input and analog ground. No other
connection should be made to this input and the poten-
tial for coupling onto this input should be minimized to
avoid degrading analog performance.
The VCM output provides the DC bias point to which AC
signals are referenced and processed internally. This
output provides a common mode signal that can be
used by external circuitry operating from a single supply.
The nominal level of this output is 0.4xVA. VCM cannot
support dynamic loading and should be buffered if AC
loading is needed. For typical use, a 0.47
μ
F capacitor
should be connected across VCM and analog ground
for filtering.
NOTE:
See APPENDIX C for additional application
information regarding these reference signals.
ANALOG I/O
DS4201 analog I/O consists of two stereo inputs (AUX
and MIC) and one stereo output (OUT). Full scale input
and output signal levels supported depend on device
operating voltage, the Mixer Unit (MU:UID8) control set-
ting, and the control setting of the USB audio extension
unit (XU:UID9) as listed in the Analog Performance
Characteristics table.
Analog Inputs
Analog signal levels at both the AUX and MIC inputs
must be limited to the full scale range supported by the
operating voltage: 0.5 Vrms for 3.3V operation, 1.0
Vrms for 5.0V operation. Additionally, the input signal
must be either AC–coupled to the analog input or cen-
tered about the common mode reference level VCM.
For optimal performance, analog input signals should
be AC–coupled. External signal attenuation may be
necessary to accommodate 1 Vrms and/or 2 Vrms line
level swings that are typically output from audio equip-
ment. See APPENDIX C for recommended connection
diagrams and example interface circuits for additional
information.
Analog Outputs
Analog signal levels at the LOUT and ROUT outputs are
DC biased about the common mode reference output
VCM and should be ac–coupled to external circuitry.
Depending on operating voltage, the DS4201 is
designed to produce full–scale output levels of either
0.5 Vrms or 1.0 Vrms, see Analog Performance Charac-
teristics. Again, see APPENDIX C for recommended
connection diagrams and example interface circuits for
additional information.
POWER
Power Supply
The three power inputs to the DS4201 provide power to
the USB digital (VB), non–USB digital (VD), and analog
circuitry (VA) within the device. These power inputs,
combined with a USB suspend power mode input signal
(SPM), provide a range of power configurations. The
options include:
– Entire device powered from USB bus power.
– USB circuitry powered from USB bus power,
analog and digital circuitry powered from a sepa-
rate single source.
– USB circuitry powered from USB bus power,
analog circuitry powered from an analog supply,
digital circuitry powered from a digital supply.
– Entire device powered from non–USB bus
power with multiple variations possible.
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