CRD42L51 Cirrus Logic

CRD42L51 Reference Design for CS42L51 Features Description Ultra Small Layout The CRD42L51 evaluation board provides a quick and Single AAA Battery Source easy evaluation of select features in the CS42L51 Low 1/8 Stereo Input Allows up to 2 Vrms Signals Power, Stereo CODEC. Four pushbuttons and sixteen LEDs comprise the user interface, allowing manipula- On-Board MIC tion of the CS42L51s registers and control clock/data 1/8 Stereo Headphone Output Jack routing between the CODEC, crystal oscillator, and S/PDIF Input (CS8416 Receiver) S/PDIF Receiver. Flexible User Interface Two 1/8 stereo jacks provide analog input and output 2 Pushbuttons Enable, Disable and connections, and a S/PDIF optical receiver provides a Navigate between Reset, Standby, Input digital input connection. An on-board microphone dem- Source and Effects Options onstrates the high dynamic range of the CS42L51s Programmable Gain Amplifier (PGA) and MIC pre- 2 Pushbuttons Adjust Volume and Effects amplifier. CRD42L51 Actual Size Power is derived from a single AAA battery boosted up to 3.3 V for the interface and control logic, then regulat- ed down to 1.8 V for the CS42L51s analog/digital core and headphone supply. The CRD42L51 highlights the ultra small layout re- quired for the CS42L51. Required components include only a few small ceramic capacitors and resistors. ORDERING INFORMATION CRD42L51 Reference Design Push Buttons Step Up DC-DC LED Selection +3.3 V Converter w/ AAA Indicators +1.8 V Linear Reg. Battery Clip IC Control/Reset Microcontroller 1/8 Stereo Line Input Jack Optical CS42L51 CS8416 Clocks/Data Input Jack Omni-directional 12.2880 MHz Microphone Master Clock Oscillator 1/8 Stereo Headphone Jack Copyright Cirrus Logic, Inc. 2005 DECEMBER 05 (All Rights Reserved) CRD42L51 TABLE OF CONTENTS 1. QUICK-START GUIDE ........................................................................................................................... 3 2. FUNCTION & LEVEL DETAILS ............................................................................................................ 4 3. SYSTEM OVERVIEW ............................................................................................................................. 5 3.1 Power (U2) ..................................................................................................................................... 5 3.2 Microcontroller (U5) ........................................................................................................................ 5 3.3 CS42L51 Audio CODEC (U1) ........................................................................................................ 5 3.4 CS8416 Digital Audio Receiver (U4) .............................................................................................. 5 3.5 Oscillator (Y1) ................................................................................................................................. 5 3.6 Analog Input ................................................................................................................................... 5 3.7 Analog Outputs ............................................................................................................................... 5 3.8 Switch & Pushbutton ...................................................................................................................... 6 3.9 LEDs ............................................................................................................................................... 6 3.10 Error Indicators ............................................................................................................................. 6 3.11 Layout ........................................................................................................................................... 6 4. SYSTEM CONNECTIONS & INTERFACE ............................................................................................. 7 5. CRD42L51 SCHEMATICS ..................................................................................................................... 9 6. CRD42L51 LAYOUT ........................................................................................................................... 13 7. REVISION HISTORY ............................................................................................................................ 19 LIST OF FIGURES Figure 1. Block Diagram............................................................................................................................... 8 Figure 2. CS42L51 and Analog I/O (Schematic Sheet 1) ............................................................................9 Figure 3. S/PDIF Input (Schematic Sheet 2).............................................................................................. 10 Figure 4. Microcontroller, Pushbuttons and LED Indicators (Schematic Sheet 3) ..................................... 11 Figure 5. DC-DC Converter and AAA Battery Clip (Schematic Sheet 4) ................................................... 12 Figure 6. Silk Screen Top........................................................................................................................... 13 Figure 7. Silk Screen Bottom ..................................................................................................................... 14 Figure 8. Top-Side Layer ........................................................................................................................... 15 Figure 9. Internal Layer (Ground Plane) .................................................................................................... 16 Figure 10. Internal Layer (Power Plane) .................................................................................................... 17 Figure 11. Bottom-Side Layer .................................................................................................................... 18 2 DS679RD1