3.3V
LDO
TAS1020B
3.3V
I2S
GPIO
EEPROM
I2C
DIR9001
4.5-26V
INPUT
USB
AUDIO
INPUT
OPT -SPDIF
4.5-26V
TAS6424
OUTPUTS
TAS1020B is turned off during EMC test
STBY SW
GPIO
2
nd
ORDER LC
FILTER
SPDIF POWER SW
2
nd
ORDER LC
FILTER
SHUTDOWN
MUTE
FAULT
WARN
I2S
SOURCE
SELECT
LED
External
I2S
MUTE SW
SPDIF
3.3V
5V-USB
3.3V
3.3V
3.3V
SPDIF LOCK
Selects Optical
Remove
Resistors
For External
I2S Input
Copyright © 2016, Texas Instruments Incorporated
Hardware Overview
3
SLOU453A – September 2016 – Revised October 2017
Copyright © 2016–2017, Texas Instruments Incorporated
TAS6424-Q1 Evaluation Module
The block diagram shows the TAS6424E3 EVM signal flow.
Figure 2. EVM Block Diagram
2
Hardware Overview
2.1
TAS6424E3 Evaluation Module Functions
•
The EVM only needs single supply to operate
•
The VBAT can be separated for PVDD operation higher than 18 V
•
Two audio sources can be selected readily
1. If USB is selected, Windows Media Player can be used to stream audio.
2. If optical is selected, an optical source such as DVD player can be used to stream audio.
3. If external digital audio source such as Programmable Serial Interface Adapter (PSIA) from Audio
Precision, series resistors on I2S signals can be removed and jumpers can be used to insert
external I2S signals.
•
There are three switches
1. SPDIF power switch turns on and off optical to I2S converter.
2. Standby switch puts the device on or out of standby.
3. Mute switch stops or starts PWM modulation.
•
USB connection also uses as a controller via I2C. The Pure Path Console 3 is the User Interface
sending I2C commands to the device. PPC3 will be discussed in a later section.