Texas Instruments PCM1798 System Requirements, Electrostatic Discharge Warning, Reset Operation

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1.3System Requirements

The DEM-DSD1796/PCM1795/PCM1796/PCM1798 EVM has the following requirements:

∙±15-V analog power supply at AVCC+, AVCC–, and GND

∙5-V DAC power supply at VCC and GND

∙S/PDIF input (sampling rate fS is up to 96 kHz) connected at the coaxial or optical connector

∙RCA analog output connected at CN103 (Lch) and CN104 (Rch); analog full-scale output level is 4.5

VRMS.

∙PC connected to printer connector CN003 for demonstration software operation (if necessary)

∙Appropriate test module:

–DEM-PCM1795: for PCM1795

–DEM-PCM1796: for PCM1796

–DEM-DSD1796: for DSD1796

–DEM-PCM1798: for PCM1798

1.4Electrostatic Discharge Warning

Many of the components on the DEM-DSD1796/PCM1795/PCM1796/PCM1798 EVM are susceptible to damage by electrostatic discharge (ESD). Customers are advised to observe proper ESD handling precautions when unpacking and handling the EVM, including the use of a grounded wrist strap at an approved ESD workstation.

CAUTION

Failure to observe ESD handling procedures may result in damage to EVM components.

1.5Function Control for DAI Interface Format

SW001, SW002, and SW003 are switches for controlling the audio interface format of the DAI receiver CS8414. The default audio interface format of the DSD1796/PCM1795/PCM1796/PCM1798 is I2S™ format. Table 1-1lists the digital audio receiver configuration parameters.

Table 1-1. Digital Audio Receiver Configuration

			Receiver Output Data
SW001	SW002	SW003	Format
L	L	L	16- to 24-bit left–justified
L	H	L	16- to 24-bit l2S
H	L	H	16-bit right-justified (or
			standard)
L	H	H	18-bit right-justified (or
			standard)

1.6Reset Operation

Pressing the SW004 pushbutton initiates a reset operation of the CS8414.

SLEU057A–September 2004–Revised May 2009 Description 9

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