Texas Instruments TAS5601 manual 3.2.3USB Interface, 3.2.4Digital Audio Interface SPDIF J1/OPTO

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Installation

∙Connect the left speaker wires to the corresponding metal binding posts marked J2 and J4 on the TAS5601EVM board.

∙Connect the right speaker wires to the corresponding metal binding posts marked J6 and J8 on TAS5601EVM board.

For SE:

∙Connect the four sets of speaker wires to the pairs J2-J3, J4-J5, J6-J7, and J8-J9.

3.2.3USB Interface

The TAS5601 registers are accessed through I2C bus lines SDA and SCL. The USB circuit and USB connector on the MC5601 board facilitates the connection between a host computer and the device. The EVM USB circuit is powered by the 5-V USB line of the host PC, and is independent of the power supplies available on the board. The USB device used is a TAS1020B from Texas Instruments.

3.2.4Digital Audio Interface SPDIF (J1/OPTO)

The Digital Audio Interface accepts digital audio data using the I2S protocol. See the TAS5706 data sheet for more information.

The OPTO connector is the SPDIF interface on the MC5601 board. When the optical cable is connected and the signal source is powered up, verify that the SPDIF lock indicator (blue LED3) illuminates, confirming that there is a viable signal available to the device. Install the four clock/data jumpers across the middle pin and the pin marked SPDIF.

For detailed information on how the data and clocks are provided to the TAS5601, see the schematic appearing at the end of this document and the DIR9001 device data sheet.

3.2.5ADC Interface

In the absence of a digital signal source, the PCM1808 ADC may be used to convert an analog audio signal to a digital signal to the TAS5601. The DIR9001 still provides clock signals to the ADC in this process. The DIR9001 oscillator frequency (Y2) determines the sampling frequency in the absence of a digital signal. If the OSC frequency is 24 MHz, the sampling frequency is set at 96 kHz; if OSC is set at 12 MHz, the sampling frequency defaults to 48 kHz when there is no signal on the SPDIF input terminals. A 12-MHz crystal is installed on the MC5601 board. The ADC is an additional feature of this board to provide flexibility in sourcing an audio signal to the TAS5601. Review the PCM1808 data sheet for a detailed description of the ADC on this EVM. Install the jumper on SDW2 across the middle pin and the pin marked ADC.

3.2.6Board Power-Up General Guidelines

Connect the MC5601 and the TAS5601EVM boards by locating pin 1 on each board, indicated by a small white triangle. The TAS5601EVM plugs into the MC5601 board. Pin 1 on each board should be connected to each other.

Install the EVM software on the PC before powering up the board. After connecting the loudspeakers or other loads, power supplies, and the data line, power up the 5-V power supply first; then power up the PVDD power supply. It is recommended initially to set the PVDD level to 10 V, then ramp it up to 20 V to verify cable connections.

6 TAS5601 Digital Power Amplifier With MC5601 Modulator Kit SLOU219–February 2008

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