Texas Instruments TA5704EVM manual PSC Connector, Digital Audio Interface Spdif J1/OPTO

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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.

2.2PSC Connector

∙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.

2.3Loudspeaker and Subwoofer Connectors (2-Channel BTL Configuration)

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-Ωspeaker. Connect the subwoofer positive and negative nodes to the corresponding metal binding posts on the TAS5601EVM2.

2.4Digital Audio Interface SPDIF (J1/OPTO)

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.

10 TA5704EVM 4-Channel Digital Audio Power Amplifier with Hardware Control SLOU224–April 2008

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