Texas Instruments TA5704EVM - Manual (Page 10)

2.2 PSC Connector
2.3 Loudspeaker and Subwoofer Connectors (2-Channel BTL Configuration)
2.4 Digital Audio Interface SPDIF (J1/OPTO)
System Interfaces www.ti.com
Table 1. Recommended Power Supplies
Description Voltage Limitations Current Recommendations
(8
Ω
load)
System power supply 5 V 500 mA
Output power stage supply 10 – 26 V 3A (1)
(1) The rated current correspond to 2 channels at 20W per channel.
•
Connect the positive node of the 5V (VIN) power supply to the red binding post marked VIN.
•
Connect the GND node of the 5V power supply to the black binding post marked GND
•
Connect the positive node of the high voltage power supply (PVCC) to the red binding post marked
PVCC.
•
Connect the negative node of the high voltage power supply (PGND) to the black binding post marked
PGND.
There is no specific power up sequence for TAS5704, but it is recommended to power up the VIN
supply first while reset is kept low for at least 1ms and then power up the PVCC.
CAUTION
Both positive and negative speaker outputs are floating and may not be
connected to ground (e.g. through an oscilloscope).
•
Connect the positive (+) and negative (–) nodes of the left speaker to the corresponding metal binding
post marked OUTA and OUTB on TAS5704EVM board.
•
Connect the positive (+) and negative (–) nodes of the right speaker to the corresponding metal
binding post marked OUTC and OUTD on TAS5704EVM board.
•
Install jumpers JP3–JP6 and JP7–JP10 for BTL configuration
•
The subwoofer is an option on this EVM, which is provided through connecting TAS5601EVM2 to the
TAS5704EVM using connector J1. Connector J1 provides the power and corresponding PWMs to the
TAS5601EVM2 (subwoofer amplifier). TAS5601EVM2 is configured in PBTL and is able to provide
40W to an 8-
Ω
speaker. Connect the subwoofer positive and negative nodes to the corresponding
metal binding posts on the TAS5601EVM2.
The Digital Audio Interface contains digital audio signal data (I2S). See TAS5704 Data sheet ( SLOS563 )
for signal timing and details not explained in this document.
RCA connector and OPTO connector are the two SPDIF interfaces. The switch S1 is used to toggle
between OPTO and RCA connector based on available signal source. Once the RCA cable or optical
cable is connected and the signal source is powered up, please verify the SPDIF lock indicator (blue
LED3) to make sure there is viable signal available to the device.
The format of the DIR9001 SPDIF receiver can be changed using jumpers FMT0 and FMT1. Jumpers
installed = 0. Jumpers removed = 1. The description of possible modes is printed on the EVM.
See the schematic of TAS5704EVM and the DIR9001 device for detail information on method by which
the data and clocks are provided to TAS5704.
TA5704EVM 4-Channel Digital Audio Power Amplifier with Hardware Control 10 SLOU224 – April 2008
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