參數(shù)資料
型號(hào)： TAS3001EVM
廠商： Texas Instruments, Inc.
英文描述： TAS3001EVM(TAS3001評(píng)估板)
中文描述： TAS3001EVM（TAS3001評(píng)估板）
文件頁(yè)數(shù)： 8/72頁(yè)
文件大?。?/td> 162K
代理商： TAS3001EVM
Description
1-2
1.1
Description
This user
’
s guide describes the operation of the TAS3001 EVM. The user
’
s
guide contains descriptions and schematics for a stereo application. The
board described is an example design that can be customized for specific ap-
plications.
An analog stereo input signal is provided through a 3.5-mm stereo jack. The
left and right channels of the signal are filtered and converted into left and right
digital signals via the TLC320AD77
’
s analog-to-digital converter. The digital
signals are then equalized by the TAS3001 and converted back to analog via
the TLC320AD77
’
s digital-to-analog converter. The analog left and right
signals are amplified at the output stage and piped to the line output to drive
amplified speakers via a 3.5-mm stereo jack. The output stage is capable of
driving internally-amplified speakers or a stereo amplifier
’
s line input.
Additionally, the speaker equalization board contains a two-channel,
24-watt-per-channel audio power amplifier. The output of the power amplifier
is differential; therefore, there are no capacitors in its output circuit that could
limit its low frequency response. The output of the power amplifier is
connected to RCA connectors. Since the amplifier has a differential output,
both terminals of the connection contain the amplified signal. Ensure that
neither of these contacts is connected to ground. The power amplifier also
contains an LED, labeled CLIP in the silkscreen on the PCB. The LED
illuminates when the maximum output power is exceeded or when one of the
outputs is shorted to ground.
Six switches are used to program the digital equalization of the TAS3001 via
the MSP430 microcontroller. The microcontroller provided with this board is
preprogrammed for five different EQ settings that can be selected via different
combinations of the switches. The switches and EQ settings are described in
Section 3.2. This microcontroller, in conjunction with the six switches, can also
adjust the volume, bass, and treble settings of the TAS3001. The settings for
changing the volume, bass, and treble levels are described in Section 5.2.
The MSP430 is placed in a socket so that it can be replaced with a 50-
resistor between pins 7 and 13 to reset the board. The board can then be
controlled through the DB25 connector. A 25-pin DB25 (male at both ends) is
then connected between the EVM and a PC. The cable must have all 25 wires
connected (not an RS232 extender cable) and the parallel port on the PC must
be set to the EPP mode. If the EPP mode is not available, the bidirectional or
PS-2 mode will work in most cases. The TAS3001 EVM is shipped with the
50-
resistor installed. If stand-alone operation is desired, an MSP430
microcontroller can be requested from the digital speaker group at Texas
Instruments (214
–
480
–
3362).
This system receives and transmits digital data at a 48-kHz sampling
frequency.
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