CDB8420 Cirrus Logic

CDB8420 Evaluation Board for CS8420 Features Description The CDB8420 is designed to allow rapid evaluation of Asynchronous Sample Rate Conversion the CS8420. Because of the high performance of the Input to output conversion ratio as large as CS8420, the board is set up for easy connection to an 1:3 or 3:1 Audio Precision or a Rohde and Schwarz test system. Receives and transmits AES/EBU, S/PDIF Currently available A/D and D/A converters are not ade- and EIAJ-340 compatible digital audio quate to test the full performance of the device. Runs from a single 5 Volt supply. Input and output data may independently be set to either Crystals are supplied to allow operation at AES/EBU or S/PDIF in optical or coaxial physical formats. 44.1 kHz, 48 kHz, and 96 kHz output sample rates. Windows 98 PC software provides a GUI interface to Digital patch area. make configuration easy. The software communicates through the PCs RS232 port to a micro-controller on the evaluation board that controls the CS8420. All the possi- ble software modes of the CS8420 may be tested. ORDERING INFORMATION CDB8420 Evaluation Board I Amtel RS232 port to PC C Optical In Optical Out CS8420 S/PDIF In S/PDIF Out AES 3 In AES 3 Out This document contains information for a new product. Preliminary Product Information Cirrus Logic reserves the right to modify this product without notice. Copyright Cirrus Logic, Inc. 2003 Dec 03 CDB8420 TABLE OF CONTENTS 1. OVERVIEW ............................................................................................................................... 3 1.1 CS8420 .............................................................................................................................. 3 1.2 Micro-Controller and Memory ............................................................................................ 3 1.3 Crystal Oscillators .............................................................................................................. 3 1.4 RS232 Port ........................................................................................................................ 3 1.5 LED Function Indicators ..................................................................................................... 3 2. CDB8420.EXE QUICK START GUIDE .................................................................................... 5 2.1 Setting up the hardware: .................................................................................................... 5 2.2 Installing the software: ....................................................................................................... 5 2.3 Starting up the software: .................................................................................................... 5 2.4 Starting up the Hardware: ..................................................................................................5 3. CDB8420.EXE USER S GUIDE ................................................................................................ 6 3.1 Main Window ..................................................................................................................... 6 3.2 Board Setup ....................................................................................................................... 7 3.3 Script file syntax ................................................................................................................. 7 LIST OF FIGURES Figure 1. CDB8420 Control Panel Main Window ............................................................................ 6 Figure 2. Board Setup Panel ........................................................................................................... 7 Figure 3. CS8420 Sample Rate Converter...................................................................................... 8 Figure 4. Atmel AVR RISC Micro-controller .................................................................................... 9 Figure 5. Power Supplies and Reset Circuit.................................................................................. 10 Figure 6. Silkscreen....................................................................................................................... 11 Figure 7. Top PCB......................................................................................................................... 12 Figure 8. Bottom PCB ................................................................................................................... 13 LIST OF TABLES Table 1. System Connections ......................................................................................................... 4 Table 2. CDB8420 Jumper Settings................................................................................................4 Table 3. Script file syntax description.............................................................................................. 7 2 DS245DB4