Texas Instruments TAS5727 Software Installation, Digital Audio Interface Spdif, ADC Interface

Page 5

www.ti.com

Installation

OUT A

OUT￿B

+ –

Figure 5. BTL Connection

2.1.4USB Interface

The TAS5727 registers are accessed through I2C™ bus lines SDA and SCL. The USB circuit and USB connector on the MC57xxPSIA board facilitates the connection between a host computer and the device. The EVM USB circuit is powered by the 5V USB line of the host PC and is independent of the power supplies available on the board. The USB device that is used is a TAS1020B from Texas Instruments.

2.1.5Digital Audio Interface SPDIF

The Digital Audio Interface SPDIF (RCA/OPTO) accepts digital audio data using the I2S protocol. See the TAS5727 data sheet for more information.

The RCA connector and the OPTO connector are the two SPDIF interfaces on the MC57xxPSIA board. The switch S3 toggles between the OPTO and RCA connector to accommodate the signal source. When the RCA cable or optical cable is connected and the signal source is powered up, verify that the SPDIF lock indicator (blue LED5) illuminates, confirming that a viable signal is available to the device. Install a jumper on JP4 across the middle pin and the pin marked SPDIF to connect the digital source to SDIN1. Install a jumper on JP5 to connect the digital source to SDIN2.

For detailed information on how the data and clocks are provided to the TAS5727, see the schematic appearing at the end of this document and the DIR9001 device data sheet (SLES198).

2.1.6ADC Interface

In the absence of a digital signal source, the PCM1808 ADC can be used to convert an analog audio signal to a digital signal to the TAS5727. The DIR9001 still provides clock signals to the ADC in this process. A 12MHz crystal is installed on the MC57xxPSIA board. The ADC is an additional feature of this board to provide flexibility in sourcing an audio signal to the TAS5727. Review the PCM1808 data sheet (SLES177) for a detailed description of the ADC on this EVM. Install the jumper on JP4 across the middle pin and the pin marked ADC to select ADC as the source for SDIN1.

2.1.7Board Power-Up General Guidelines

Connect theMC57xxPSIA and the TAS5727EVM boards by locating pin 1 on each board, indicated by a small white triangle. TheMC57xx plugs down onto the TAS5727EVM board (i.e., the TAS5727EVM board fits underneath the MC57xxPSIA board). Pin 1 on each board must 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 5V power supply first; then power up the PVDD power supply. It is recommended initially to set the PVDD level to 10V, then ramp it up to 20V to verify cable connections.

2.2Software Installation

Download the TAS57x UI from the TI Web site. The TI Web site always has the latest release and any updates to versions of the GUI.

SLOU299 –December 2010

TAS5727 25W Digital Input Amplifier—with EQ and 2-Band DRC

5

Submit Documentation Feedback

 

 

© 2010, Texas Instruments Incorporated

Image 5
Contents TAS5727 25W Digital Input Amplifier with EQ and 2-Band DRC Overview EVM Installation TAS5727EVM and MC57xxPSIA FeaturesLoudspeaker Connectors Connecting the TAS5727EVM to MC57xxPSIARecommended Power Supplies Board Power-Up General Guidelines Software InstallationDigital Audio Interface Spdif ADC InterfaceInstallation Process Structure I2C Memory Tool Connect the GUI to the EVMBiquad GUI Volume FunctionDRC GUI DRC Options GDE Target Connect Using The Fault PIN As An Error IndicatorCommon Configurations RCA/OPTICAL Jumpers SwitchesLED Indicators TAS5727EVM and MC57xxPSIA Board Layouts TAS5727EVM Top Composite AssemblyBill of Materials for TAS5727EVM Bill of MaterialsOUT SchematicsUSB Interface Spdif Receiver ADC / Connector I/O FCC Warning Evaluation BOARD/KIT Important NoticeImportant Notice