Texas Instruments TLV320AIC3007 Evaluation Module (EVM) and USB motherboard TLV320AIC3007EVM-K TLV320AIC3007EVM-K 데이터 시트
제품 코드
TLV320AIC3007EVM-K
4.3
Audio Input/ADC Tab
TLV320AIC3007EVM Software
www.ti.com
Figure 6. Audio Input/ADC Tab
The Audio Input/ADC tab allows control of the analog input mixer and the ADC. The controls are
displayed to look similar to an audio mixing console (see
displayed 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 TLV320AIC3007
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 must 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 changes to Active. Note that the user can connect some channels to both ADCs, whereas
others only connect to one ADC.
others only connect to one ADC.
3. Adjust the Level control to the desired attenuation for the connected channel. This level adjustment
can be done independently for each connection.
The TLV320AIC3007 offers a programmable microphone bias that can either be powered down, set to 2
V, 2.5 V, or the power supply voltage of the ADC (AVDD_ADC). Control of the microphone bias (mic bias)
voltage is accomplished by using the Mic Bias pulldown menu button above the last two channel strips.
To use the onboard microphone, hardware jumpers W10 and W11 must be installed. Nothing must be
plugged into J9, in order for the mic bias settings in the software to take effect. Also, jumper W9 (Mic Bias
Sel) must be set to connect positions 2 and 3, so that MICBIAS is controlled by the TLV320AIC3007.
V, 2.5 V, or the power supply voltage of the ADC (AVDD_ADC). Control of the microphone bias (mic bias)
voltage is accomplished by using the Mic Bias pulldown menu button above the last two channel strips.
To use the onboard microphone, hardware jumpers W10 and W11 must be installed. Nothing must be
plugged into J9, in order for the mic bias settings in the software to take effect. Also, jumper W9 (Mic Bias
Sel) must be set to connect positions 2 and 3, so that MICBIAS is controlled by the TLV320AIC3007.
Also shown are controls for Weak Common Mode Bias. Enabling these controls results in unselected
inputs to the ADC channels to be weakly biased to the ADC common mode voltage.
inputs to the ADC channels to be weakly biased to the ADC common mode voltage.
Nearby 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 Power Up buttons. PGA
soft-stepping for each channel is selected using the pulldown menu control. The two large knobs set the
actual ADC PGA Gain and allow adjustment of the PGA gains from 0 dB to 59.5 dB in 0.5-dB 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.
channel of the ADC can be powered up or down as needed using the Power Up buttons. PGA
soft-stepping for each channel is selected using the pulldown menu control. The two large knobs set the
actual ADC PGA Gain and allow adjustment of the PGA gains from 0 dB to 59.5 dB in 0.5-dB 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.
TLV320AIC3007EVM-K
12
SLAU286 – June 2009