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Figure 2-4
shows how to connect the external audio interface, with the top row for the signal and the bottom row
for ground.
Figure 2-5. AC-MB Connection with External Audio Serial Interface
2.1.2 AC-MB Power Supply
The complete EVM system is powered from a single 5-V power supply. However, the motherboard has different
low-dropout regulators (LDOs) integrated that provide the required power supplies to the different blocks of the
board.
Figure 2-6
shows a block diagram depicting the power structure of the AC-MB.
The AC-MB can be powered from the host computer by using the USB 5-V power supply (VBUS) by shorting
header J5, USB POWER. Additionally, the AC-MB can be powered from an external power supply connected to
terminal J4, EXTERNAL POWER. Header J5 must be open for external supply operation. The IOVDD voltage for
the digital signals that is provided to the evaluation module is generated on the motherboard from the main
power supply (USB or external). The voltage levels available are 1.8 V and 3.3 V, and can be selected via the J3
SBAU359 – DECEMBER 2020
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Figure 2-6. Power-Supply Distribution of the AC-MB
Copyright © 2021 Texas Instruments Incorporated
Hardware Overview
To EVM
ADCx120EVM-PDK
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