CRD4412A Cirrus Logic

CRD4412A 2 x 15 W CS4412A Digital Power Stage Reference Design Features Description Pre-Configured for Stereo Full-Bridge The CRD4412A demonstrates the CS4412A digital am- plifier power stage. This reference design is pre- Operation configured as a two-channel full-bridge power stage Delivers 15 W/Ch into 8 at <0.5% which delivers 15 W per channel into 8 loads using a THD+N single +18 V supply. The design can be easily config- ured to operate as a single channel parallel full-bridge Easily Configurable for Mono Parallel Full- power stage capable of delivering 30 W into a 4 load Bridge Operation from an +18 V supply. The CRD4412A can be powered Delivers 30 W into 4 at <10% THD+N from +8 V to +18 V. The CRD4412A is designed to operate in conjunction Directly Connects to CRD4525 Digital Amplifier with the CRD4525. When connected, the combination Reference Design implements a 2.1 configuration with the CRD4412A op- Implements a 2.1 Configuration erating in mono parallel full-bridge mode. Flexible I/O Provided The CRD4412A can also be operated without an at- tached CRD4525. In this configuration, all input/output PWM Logic Level Signal Inputs connections are achieved through the CRD4412 inter- CS4412A Error and Warning Signals face header. Operates from +8 V to +18 V and +3.3 V The PWM audio power outputs are routed through an nd inductor/capacitor 2 order low-pass filter (LPF) to re- Demonstrates Recommended Layout and move high-frequency components from the output Grounding Arrangements signal, effectively converting it from digital to analog. ORDERING INFORMATION Implements Recommended PWM Output Filtering CRD4412A CS4412A Reference Design Mono Parallel Full-Bridge Right PWM Output Left PWM Filter Stereo Full-Bridge CS4412A Over Current Error Under Voltage/Temp Error Thermal Warning Output Filter Power Reset Copyright Cirrus Logic, Inc. 2007 MAY 07 (All Rights Reserved) CRD4412A TABLE OF CONTENTS 1. SYSTEM OVERVIEW ............................................................................................................................. 3 1.1 Power ............................................................................................................................................... 3 1.2 CS4412A Digital Amplifier Power Stage .......................................................................................... 3 1.3 External Data Headers ..................................................................................................................... 3 1.4 Stereo/Mono Selection ..................................................................................................................... 3 1.5 Speaker Outputs .............................................................................................................................. 4 2. OPERATING INSTRUCTIONS ............................................................................................................... 5 2.1 Operation with CRD4525 ................................................................................................................. 5 2.2 Stand-Alone Operation .................................................................................................................... 5 3. GROUNDING AND POWER SUPPLY DECOUPLING .......................................................................... 6 3.1 Power Supply Decoupling ................................................................................................................ 6 3.2 Electromagnetic Interference (EMI) ................................................................................................. 6 3.2.1 Suppression of EMI at the Source ........................................................................................... 6 4. SYSTEM CONNECTIONS AND JUMPERS ........................................................................................... 7 5. CRD SCHEMATICS ................................................................................................................................ 8 6. CRD LAYOUT ...................................................................................................................................... 10 7. PARALLEL FULL-BRIDGE PERFORMANCE PLOTS ....................................................................... 15 8. STEREO FULL-BRIDGE PERFORMANCE PLOTS ............................................................................ 21 9. REVISION HISTORY ............................................................................................................................ 27 LIST OF FIGURES Figure 1. Stereo Full-Bridge Speaker Terminal Configuration ....................................................................4 Figure 2. Mono Parallel Full-Bridge Speaker Terminal Configuration ......................................................... 4 Figure 3. CS4412A - Schematic Page 1 ..................................................................................................... 8 Figure 4. Power Outputs - Schematic Page 2 ............................................................................................. 9 Figure 5. Silkscreen Top ........................................................................................................................... 10 Figure 6. Top-Side Copper Layer .............................................................................................................. 11 Figure 7. Inner Copper Layer 1 ................................................................................................................. 12 Figure 8. Inner Copper Layer 2 ................................................................................................................. 13 Figure 9. Bottom-Side Copper Layer ........................................................................................................ 14 Figure 10. Frequency Response in Parallel Full-Bridge Configuration ..................................................... 15 Figure 11. THD+N vs Power in Parallel Full-Bridge Configuration ........................................................... 16 Figure 12. THD+N vs Frequency in Parallel Full-Bridge Configuration ..................................................... 17 Figure 13. FFT at -60dB Input in Parallel Full-Bridge Configuration ......................................................... 18 Figure 14. FFT at 0dB Input in Parallel Full-Bridge Configuration ............................................................ 19 Figure 15. Inter-Modulation Distortion of 19 kHz + 20 kHz in Parallel Full-Bridge Configuration .............. 20 Figure 16. Frequency Response in Stereo Full-Bridge Configuration ....................................................... 21 Figure 17. THD+N vs Power in Stereo Full-Bridge Configuration ............................................................. 22 Figure 18. THD+N vs Frequency in Stereo Full-Bridge Configuration ...................................................... 23 Figure 19. FFT at -60dB Input in Stereo Full-Bridge Configuration ........................................................... 24 Figure 20. FFT at 0dB Input in Stereo Full-Bridge Configuration .............................................................. 25 Figure 21. Inter-Modulation Distortion of 19 kHz + 20 kHz in Stereo Full-Bridge Configuration ............... 26 LIST OF TABLES Table 1. System Connections ..................................................................................................................... 7 Table 2. System Headers ............................................................................................................................ 7 Table 3. CRD4412 Interface Header Signal Assignments .......................................................................... 7 2 DS786RD1