Texas Instruments PGA4311 Evaluation Module PGA4311EVM PGA4311EVM 데이터 시트
제품 코드
PGA4311EVM
Software Guide
3.6 Gain Controls
The Gain Controls occupy the bottom half of each DUT panel. There are three gain sliders, including
one each for left and right channel, and a Gang slider for controlling both channels simultaneously.
The DUT1 panel controls Channels 1 and 2 of the PGA4311, with Channel 2 corresponding to the
right channel, and Channel 1 corresponding to the left channel. The DUT2 panel controls Channels
3 and 4 of the PGA4311, with Channel 4 corresponding to the right channel, and Channel 3
corresponding to the left channel.
one each for left and right channel, and a Gang slider for controlling both channels simultaneously.
The DUT1 panel controls Channels 1 and 2 of the PGA4311, with Channel 2 corresponding to the
right channel, and Channel 1 corresponding to the left channel. The DUT2 panel controls Channels
3 and 4 of the PGA4311, with Channel 4 corresponding to the right channel, and Channel 3
corresponding to the left channel.
When the PGA4311 first powers up, all channels will reset to maximum attenuation (or mute). The
software also defaults to maximum attenuation at startup (shown as –Inf to the right of the sliders).
A display to the right of each slider displays the currently selected gain setting.
software also defaults to maximum attenuation at startup (shown as –Inf to the right of the sliders).
A display to the right of each slider displays the currently selected gain setting.
The Ramp radio buttons to the right of each slider are used to select the gain slider to be automated
when using the Ramp controls in the upper right-hand corner of the DUT panel.
when using the Ramp controls in the upper right-hand corner of the DUT panel.
The Pan slider functions as a Balance control, simultaneously gaining one channel while attenuating
the other. It’s behaves just like the balance control on your home or car stereo system.
the other. It’s behaves just like the balance control on your home or car stereo system.
3.7 Mode Controls
The Mode control section resides in the upper left-hand corner of each DUT panel. Only the mode
controls in the DUT1 control panel are enabled. Several functions are accessible from this section.
The Zero-Cross Detection checkbox is used to enable and disable the zero crossing detector circuit
inside the PGA4311 device. The default setting is zero crossing detection disabled.
controls in the DUT1 control panel are enabled. Several functions are accessible from this section.
The Zero-Cross Detection checkbox is used to enable and disable the zero crossing detector circuit
inside the PGA4311 device. The default setting is zero crossing detection disabled.
The Mute by Pin checkbox is used to enable or disable the MUTE pin function of the PGA4311. When
MUTE is LOW, the PGA4311 sets both left and right channel attenuation to maximum (or mute). The
default setting is mute disabled.
MUTE is LOW, the PGA4311 sets both left and right channel attenuation to maximum (or mute). The
default setting is mute disabled.
Two buttons allow the user to quickly set the gain of both left and right channels to either 0dB or
–Inf dB (or mute). The –Inf dB button differs from the Mute by Pin checkbox in that it programs
maximum attenuation for both left and right channels using the PGA4311’s gain control registers, as
opposed to using the MUTE pin.
–Inf dB (or mute). The –Inf dB button differs from the Mute by Pin checkbox in that it programs
maximum attenuation for both left and right channels using the PGA4311’s gain control registers, as
opposed to using the MUTE pin.
3.8 Register Loop-Back Controls
With the SDO_R jumper installed, the user can test the function of the PGA4311 serial interface by
using the Register Loop-Back control available in each DUT panel. Simply press the Interrogate
button to read back the values being programmed for each channel. This function is included
primarily for diagnostics, to ensure that the PC parallel port and the PGA4311 are communicating
properly.
using the Register Loop-Back control available in each DUT panel. Simply press the Interrogate
button to read back the values being programmed for each channel. This function is included
primarily for diagnostics, to ensure that the PC parallel port and the PGA4311 are communicating
properly.
3.9 Ramp Function Controls
The Ramp controls allow automation of the gain settings for the PGA4311. The user enters the top
and bottom points for the ramp, along with the desired step size and delay between steps. The ramp
may be generated from bottom to top (Ramp Up) or from top to bottom (Ramp Down) for the given
range. The ramp step size may be set from 0.5dB to 3.0dB in 0.5dB increments. The ramp step delay
may be set using relative delay settings of 0, 1, 2, 5, 10, 20, or 50.
and bottom points for the ramp, along with the desired step size and delay between steps. The ramp
may be generated from bottom to top (Ramp Up) or from top to bottom (Ramp Down) for the given
range. The ramp step size may be set from 0.5dB to 3.0dB in 0.5dB increments. The ramp step delay
may be set using relative delay settings of 0, 1, 2, 5, 10, 20, or 50.
The channel selection for the automated ramp is selected using the radio buttons located to the right
of the gain sliders in the Gain Control section of each DUT panel.
of the gain sliders in the Gain Control section of each DUT panel.
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