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4.5 Audio Input/ADC Tab

TLV320AIC3104EVM Software

Figure 7. Audio Input 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 Figure 7 ). Each analog input channel has a

vertical strip that corresponds to that channel. By default, all inputs are muted when the TLV320AIC3104

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.

3. Adjust the Level control to the desired attenuation for the connected channel. This level adjustment

can be done independently for each connection.

The TLV320AIC3104 offers a programmable microphone bias that can either be powered down or 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, 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 TLV320AIC3104.

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.

SLAU218 – August 2007 TLV320AIC3104EVM and TLV320AIC3104EVM-PDK 13

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4.6 Bypass Paths

TLV320AIC3104EVM Software

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 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.

Figure 8. Bypass Paths

The Bypass Paths tab shows the active and passive bypass paths available for control.

The passive analog bypass paths allow the inputs to be routed straight through the device to the outputs

without turning on any of the internal circuitry. This provides a signal path through the device with minimal

power consumption.

The active bypass paths allow the inputs to bypass the ADC and DAC functional blocks and be routed to

the analog output mixers to be summed into the output amplifiers.

TLV320AIC3104EVM and TLV320AIC3104EVM-PDK14 SLAU218 – August 2007

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4.7 Audio Interface Tab

TLV320AIC3104EVM Software

Figure 9. Audio Interface Tab

The Audio Interface tab (Figure 9 ) allows configuration of the audio digital data interface to the

TLV320AIC3104.

The interface mode may be selected using the Transfer Mode control—selecting either I

S mode, DSP

mode, or Right- or Left-Justified modes. Word length can be selected using the Word Length control, and

the bit clock rate can also be selected using the Bit Clock rate control. The Data Word Offset, used in

TDM mode (see the TLV320AIC3104 data sheet) can also be selected on this tab.

Along the bottom of this tab are controls for choosing the BLCK and WCLK as being either inputs or

outputs. With the codec configured in Slave mode, both the BCLK and WCLK are set to inputs. If the

codec is in Master mode, then BCLK and WCLK are configured as outputs. Additionally, two buttons

provide the option for placing the DOUT line in a 3-state mode when there is not valid data and

transmitting BLCK and WCLK when the codec is powered down.

Re-synchronization of the audio bus is enabled using the controls in the lower right corner of this screen.

Re-synchronization is done if the group delay changes by more than ± FS/4 for the ADC or DAC sample

rates (see the TLV320AIC3104 data sheet). The channels can be soft muted when doing the re-sync if the

Soft Mute button is enabled.

In the upper right corner of this tab is the Digital Mic Functionality control. The TLV320AIC3104 can

accept a data stream from a digital microphone, which would have its clock pin connected to the

TLV320AIC3104 GPIO1 pin, and the mic data connected to the GPIO2 pin. Once the digital microphone

functionality is enabled, the Digital Mic/ADC Selection selection allows the user to choose if one or two

digital microphones are connected to the codec. If only one digital microphone is connected, then the

remaining ADC can be used with an analog input signal from the analog input pins. Refer to section

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Part #	897-30-004-90-000000
Description	CONN USB RECEPT TYPE B PCB
Category	CONNECTOR
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