Texas Instruments ADCx120EVM, User Manual, Page: 16 / 36

5 Master Mode Operation
To operate ADCx120EVM-PDK in master mode, S1 and S0 on the AC-MB must first be set to "External ASI" as
illustrated in
Figure 2-4 .
The device does not have a dedicated MCLK pin, the master clock can be applied at GPIO1, IN2P_GPI1, or
MICBIAS_GPI2. Since GPI1 and GPI2 are multipurpose pins shared with analog inputs and MICBIAS, using
them as the MCLK input limits the devices functionality. It is recommended to use the GPIO1 pin for MCLK.
To use GPIO1 as MCLK the MCLK signal must either be applied at the J10 terminal, or at the "External ASI"
header on the AC-MB board with the other clocks. To use the "External ASI" header, it is necssary to install a
0-Ohm resistor at R11 on the EVM, which is depopulated by default.
6 Quick Start
Configure the AC-MB for the USB audio (TDM) and the TLV320ADCx120EVB for the onboard microphone
inputs.
The GUI comes with preset files to that can be used for easy initial setup. Select the Load preset option in the
top corner of the GUI and load the On Board Microphone setting, as shown in Figure 6-1 and Figure 6-2 . Be sure
to populate the jumpers described in the settings as described in Table 2-1 .
Figure 6-1. Loading Presets
Figure 6-2. Onboard Mic Preset
Master Mode Operation www.ti.com
16 ADCx120EVM-PDK, PCMD3140EVM-PDK Evaluation Module SBAU359A – MAY 2019 – REVISED JUNE 2021
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