Figure 2-2. Ac-Mb Usb Audio Setting; Figure 2-3. Ac-Mb Optical Or Auxiliary Analog Audio Setting; Figure 2-4. Ac-Mb External Audio Setting - Texas Instruments ADCx120EVM-PDK User Manual

Hardware Overview
2.1.1.2 Optical or Auxilary Analog Audio Input
Serial interface signals are provided from the PCM9211 digital transceiver, which is capable of sending digital
data to the EVB from an analog input or optical input. Meanwhile, the data from the EVB can be streamed
through the optical output.
operation.

Figure 2-3. AC-MB Optical or Auxiliary Analog Audio Setting

The optical output of the AC-MB streams the data captured on the EVM with the format determined by the
input source used. When there is an optical input connected, the LOCK LED must be ON, and the PCM9211
streams the audio serial interface clocks with the format determined by the optical input frame. The digital data
from the optical input is streamed to the evaluation module. If the optical input is not connected, the PCM9211
captures the input signal provided through the analog input, and streams the signal to the evaluation module.
This feature can be useful when a digital input DAC is connected to the AC-MB, providing an analog input for
quick evaluation. In Auxiliary Analog Audio mode the audio serial interface format is fixed to a 24-bit, 48-kHz, I
mode.
2.1.1.3 External
In this mode, the audio serial interface clocks for the evaluation board are provided through connector J7 from
an external source. This architecture allows the use of an external system to communicate with the evaluation
board, such as a different host processor or test equipment (for instance, Audio Precision PSIA). The clocks
generated from the USB interface and PCM9211 are isolated with this setting.
audio setting for the external mode of operation.
4 ADCx120EVM-PDK, PCMD3140EVM-PDK Evaluation Module

Figure 2-2. AC-MB USB Audio Setting

Figure 2-3 shows the AC-MB audio setting for the optical and analog mode of

Figure 2-4. AC-MB External Audio Setting

Copyright © 2021 Texas Instruments Incorporated
Figure 2-4 shows the AC-MB
SBAU359A – MAY 2019 – REVISED JUNE 2021
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