Texas Instruments TLV320AIC3106 Evaluation Module (EVM) and USB motherboard TLV320AIC3106EVM-K TLV320AIC3106EVM-K Datenbogen
Produktcode
TLV320AIC3106EVM-K
www.ti.com
TLV320AIC3106EVM Software
4.5
Audio Input/ADC Tab
Figure 7. Audio Input Tab
The Audio Input/ADC Tab allows control of the analog input mixer and the ADC. The controls are
dispayed to look similar to an audio mixing console (see
dispayed to look similar to an audio mixing console (see
). Each analog input channel has a
vertical strip that corresponds to that channel. By default, all inputs are muted when the TLV320AIC3106
is powered up.
is powered up.
To route an analog input to the ADC:
1. Select the Input Mode button to correctly show if the input signal is single-ended (SE) or
fully-differential (Diff). Inputs that are single-ended should be made to the positive signal terminal.
2. Click on the button of the analog input channel that corresponds to the correct ADC. The caption of the
button should change to Active. Note that the user can connect some channels to both ADCs, while
others will only connect to one ADC.
others will only connect to one ADC.
3. Adjust the Level control to the desired attenuation for the connected channel. This level adjustment
can be done independantly for each connection.
The TLV320AIC3106 offers a programmable microphone bias that can either be powered down or set to
2.0V, 2.5V, or the power supply voltage of the ADC (AVDD_ADC). Control of the microhpone bias (mic
bias) voltage is accomplished by using the Mic Bias pull-down menu button above the last two channel
strips. To use the on-board microphone, JMP2 and JMP3 must be installed and nothing should be
plugged into J6. In order for the mic bias settings in the software to take effect, JMP1 should be set to
connect positions 2 and 3, so that mic bias is controlled by the TLV320AIC3106.
2.0V, 2.5V, or the power supply voltage of the ADC (AVDD_ADC). Control of the microhpone bias (mic
bias) voltage is accomplished by using the Mic Bias pull-down menu button above the last two channel
strips. To use the on-board microphone, JMP2 and JMP3 must be installed and nothing should be
plugged into J6. In order for the mic bias settings in the software to take effect, JMP1 should be set to
connect positions 2 and 3, so that mic bias is controlled by the TLV320AIC3106.
In the upper right portion of this tab are controls for Weak Common Mode Bias. Enabling these controls
will result in unselected inputs to the ADC channels to be weakly biased to the ADC common mode
voltage.
will result in unselected inputs to the ADC channels to be weakly biased to the ADC common mode
voltage.
Below these controls are the controls for the ADC PGA, including the master volume controls for the ADC
inputs. Each channel of the ADC can be powered up or down as needed using the Powered Up buttons.
PGA soft-stepping for each channel is selected using the pull-down menu control. The two large knobs set
the actual ADC PGA Gain and allow adjustment of the PGA gains from 0dB to 59.5dB in 0.5dB steps
(excluding Mute). At the extreme counterclockwise rotation, the channel is muted. Rotating the knob
clockwise increases the PGA gain, which is displayed in the box directly above the volume control.
inputs. Each channel of the ADC can be powered up or down as needed using the Powered Up buttons.
PGA soft-stepping for each channel is selected using the pull-down menu control. The two large knobs set
the actual ADC PGA Gain and allow adjustment of the PGA gains from 0dB to 59.5dB in 0.5dB steps
(excluding Mute). At the extreme counterclockwise rotation, the channel is muted. Rotating the knob
clockwise increases the PGA gain, which is displayed in the box directly above the volume control.
13
SLAU209A – April 2007 – Revised June 2010
TLV320AIC3106EVM and TLV320AIC3106EVM-PDK
Copyright © 2007–2010, Texas Instruments Incorporated