Introduction; Hardware Overview; Ac-Mb Settings; Figure 2-1. Ac-Mb Audio Serial Interface Routing - Texas Instruments ADC 120EVM-PDK Series User Manual

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1 Introduction

The ADCx120EVM-PDK is an evaluation module (EVM) designed to demonstrate the performance and
functionality of the TLV320ADCx120 family of devices. This family includes the devices shown in
differences in performance and function noted.
Device
TLV320ADC3120
TLV320ADC5120
TLV320ADC6120

2 Hardware Overview

The evaluation kit consists of the TLV320ADCx120EVB daughterboard and the AC-MB motherboard. The
motherboard is used to provide power, control, and digital audio signals to the evaluation module. The
daughterboard contains the TLV320ADCx120 device and its input connections.

2.1 AC-MB Settings

2.1.1 Audio Serial Interface Settings
The AC-MB provides the digital audio digital signals to the evaluation module from the universal serial bus
(USB), optical, stereo jack, and external audio serial interface (ASI) header.
the ASI routing on the AC-MB.
USB
Optical Inp ut
Optical Output
Stereo An alog
Input
Switch SW2 on the AC-MB selects the audio serial bus that interfaces with the TLV320ADCx120EVB. Next to
switch SW2, the AC-MB has a quick reference table to identify the audio serial interface source options and
switch settings. The AC-MB acts as the master for the audio serial interface, with three different modes of
operation: USB, optical or analog, or external ASI.
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.
the AC-MB audio setting for the USB mode of operation.
SBAU359 – DECEMBER 2020
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Table 1-1. TLV320ADCx120 Family

SNR Without DRE (dB)
106
108
112
Aud io
Pro cessor
PCM921 1

Figure 2-1. AC-MB Audio Serial Interface Routing

Copyright © 2021 Texas Instruments Incorporated
SNR With DRE (dB)
Figure 2-1 shows a block diagram of
MUX To EVM
Sou rce
Exte rnal ASI Hea der
Sele ctor
(SW2)
Introduction
Table 1-1 with
N/A
120
123
Figure 2-2 shows
ADCx120EVM-PDK 3