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Hardware Overview
4
SBAU341B – January 2020 – Revised June 2020
Copyright © 2020, Texas Instruments Incorporated
PCM6xx0Q1EVM-PDK Evaluation Module
2.1.1.1
USB
The serial interface clocks and data are provided from the USB interface. The sampling rate and format
are determined by the USB audio class driver on the operating system. The default settings for the USB
audio interface are 32-bit frame size, 48-kHz sampling rate, BCLK and FSYNC ratio is 256, and the format
is time-division multiplexing (TDM).
The AC-MB is detected by the OS as an audio device with the name
TI USB Audio UAC2.0
.
shows the AC-MB audio setting for the USB mode of operation.
Figure 2. AC-MB USB Audio Setting
2.1.1.2
Optical or Auxiliary Analog Audio Input
Serial interface signals are provided from the
digital transceiver, which is capable of sending
digital data to the EVM from an analog input or optical input. Meanwhile, the data from the EVM can be
streamed through the optical output.
shows the AC-MB audio setting for the optical and analog
mode of operation.
Figure 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 digital-to-analog converter
(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
2
S mode.