Texas Instruments TLV320AIC3256EVM-U, Руководство пользователя, Страница: 2 / 22

EVM Overview
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1 EVM Overview
1.1 Features
• Small form factor EVM for the TLV320AIC3256 Audio Codec
• USB connection to the PC provides power, control, and streaming audio for easy evaluation.
• Easy-to-use AIC3256 Control Software (CS) configures and controls the TLV320AIC3256.
The TLV320AIC3256EVM-U is compatible with Windows™ XP-based personal computers.
1.2 Introduction
The TLV320AIC3256EVM-U is a USB audio device with programmable inputs and outputs, effects, and
extensive routing capabilities. It is a simple platform to evaluate the TLV320AIC3256 miniDSP Audio
Codec.
2 EVM Description and Getting Started
2.1 TLV320AIC3256EVM-U Hardware Description
The TLV320AIC3256EVM-U has two stereo analog input connectors (Line-In and Mic-In) and two stereo
analog output connectors (Line-Out and Headphone-Out) that are routed to the TLV320AIC3256. Digital
audio as well as control data communicated between the personal computer (PC) and the EVM are
interpreted by the TAS1020B USB Streaming Controller. Control data is communicated to the
TLV320AIC3256 via the I
2
C or SPI protocols; audio data is communicated via the I2S protocol.
An onboard 64KB EEPROM is capable of storing TLV320AIC3256 commands (scripts) as well as the
TAS1020B firmware. Two pushbuttons are provided to cycle between scripts along with two LEDs that
provide the user feedback regarding the script that is currently loaded. The EEPROM Manager in the
AIC3256 CS is used to write new scripts into the EEPROM. Additional information can be found in the
EEPROM Manager.
Table 1 summarizes the audio jacks available to connect analog inputs and outputs to the
TLV320AIC3256 and the switches.
Table 1. Audio Jacks Available to Connect Analog Inputs and Outputs
Designator Label Associated pin Description
J1 USB INPUT N/A USB Mini-B jack
J2 LINE IN IN1_L/IN1_R Line input
J3 MIC IN IN3_L/IN3_R Electret microphone input. Both stereo and mono types are supported (two or
three conductor). 2.2-k
Ω pullup resistors to MICBIAS at both the tip and the ring.
J4 LINE OUT LOL/LOR Line output. Connect only high-impedance loads to this output (e.g., external
Class-D amplifier).
J5 HP OUT HPL/HPR Headphone output
SW1 SW2 N/A RESET switch
SW2 SW2 N/A Cycles through application scripts loaded in the onboard EEPROM
SW3 SW3 N/A Cycles through patch scripts loaded in the onboard EEPROM
2 TLV320AIC3256EVM-U Evaluation Module SLOU294B – July 2010 – Revised October 2012
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