TA5704EVM 4-Channel Digital Audio Power Amplifier with Hardware Control User's Guide
1 Overview
SPDIF/
Optical,Coax
2CH AnalogInput
fromOtherSource/
DigitalOut
TAS5704
TAS5601EVM2
Subwofer
PWMout
Left
Right
I2S
User's Guide
SLOU224 – April 2008
TA5704EVM 4-Channel Digital Audio Power Amplifier with
Hardware Control
TAS5704 customer evaluation module (EVM) demonstrates the integrated circuit (IC) TAS5704 from
Texas Instruments (TI).
TAS5704 is a 4-channel device with an I2S/RJ/LJ digital audio stream input and amplified PWM signal
out. The subwoofer PWM signal is provided to an external class D power stage (TAS5601), which uses a
LC demodulation filter to drive a subwoofer. For detail information about the TAS5704 device review the
device data sheet, document number SLOS563 .
TAS5704 is designed to drive two 8- Ω loudspeakers up to 20W per channel (10%THD+N) in a BTL
configuration. The TAS5704EVM can also be configured to drive four, 4- Ω speakers in a single-ended
(SE) configuration. Finally, the TAS5704EVM can be configured to drive 2 single-ended speakers plus 1
bridge-tied speaker (2.1 mode). Review the board schematic, and TAS5601 documents for additional
information and more specific application information on the subwoofer daughter card and connector.
TAS5704EVM, together with other TI components on this board, is a complete 4 channel digital audio
amplifier system, which includes digital input (SPDIF), analog inputs via ADC, and other features like
mute, power down, output configuration control, format control, and gain control.
Figure 1. 2-Channel (BTL) Configuration with External Subwoofer EVM (TAS5601EVM2)
SLOU224 – April 2008 TA5704EVM 4-Channel Digital Audio Power Amplifier with Hardware Control 7
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