CDB35L00 Cirrus Logic

CDB35L00-X4 2.7 W x 4 CS35L00 Amplifier Demonstration Board Features Description Contains 4 CS35L00 Hybrid Class-D Amplifiers The CDB35L00-X4 demonstrates the CS35L00 high-ef- ficiency Hybrid Class-D audio amplifier. This Selectable +6 dB or +12 dB Gain demonstration board implements a four-channel, quad Selectable Operational Modes amplifier system that delivers 2.7W per full-bridge channel into 4- loads using a single +5 V supply. Device Shutdown Control Differential audio inputs can easily be connected Delivers 2.7 W/Ch into 4 at 10 % THD+N through the J10, J20, J30, and J40 headers. If desired, the gain can be adjusted through the optional input Delivers 1.6 W/Ch into 8 at 10 % THD+N resistors. Differential Mono Analog Inputs for each Component landings are available for an optional EMI CS35L00 Amplifier output filter. Demonstrates Recommended 4-Layer Layout The CDB35L00-X4 can be configured to evaluate the and Grounding Arrangements four operational modes and two gain settings of the Optional Output Filter Connections CS35L00 amplifier. Mode, Gain, and Shutdown control Optional Gain Adjustment Resistors is available through the S1 switch. Hybrid control is available through the R13, R23, R33, and R43 resistors. Powered by Single +2.5-5.5 V Power Supply ORDERING INFORMATION CDB35L00 CS35L00-X4 Demo Board Control Switch VBATT (S1) Power (J1) Analog Speaker Optional Optional CS35L00 Gain Output Input Output 4 or 8 Adjustment Filter (U1) (J10) (J11) Speaker Analog Optional Optional CS35L00 Gain Output Output 4 or 8 Input Adjustment (U2) Filter (J21) (J20) Analog Speaker Optional Optional CS35L00 Input Gain Output Output 4 or 8 Adjustment Filter (U3) (J31) (J30) Speaker Analog Optional Optional CS35L00 Gain Output Output 4 or 8 Input Adjustment (U4) Filter (J41) (J40) Copyright Cirrus Logic, Inc. 2010 APR 10 (All Rights Reserved) CDB35L00-X4 TABLE OF CONTENTS 1. SYSTEM OVERVIEW ............................................................................................................................. 3 1.1 CS35L00 Hybrid Class-D Amplifier .................................................................................................. 3 1.2 Power Supply ................................................................................................................................... 3 1.3 Operational Modes ........................................................................................................................... 3 1.3.1 Operational Mode Control ....................................................................................................... 3 1.4 Shutdown Control ............................................................................................................................ 4 1.4.1 Shutdown Control Resistors .................................................................................................... 5 1.5 Gain Control ..................................................................................................................................... 5 1.5.1 Optional Gain Adjustment Resistors .......................................................................................5 1.6 Differential Analog Inputs ................................................................................................................. 6 1.7 Speaker Outputs .............................................................................................................................. 6 1.7.1 Optional Speaker Output EMI Filter Components ................................................................... 6 2. GROUNDING AND POWER SUPPLY DECOUPLING .......................................................................... 7 2.1 Power Supply Decoupling ................................................................................................................ 7 2.2 Electromagnetic Interference (EMI) ................................................................................................. 7 2.2.1 Suppression of EMI at the Source ........................................................................................... 7 3. SYSTEM CONNECTORS AND JUMPERS ............................................................................................ 8 4. CDB SCHEMATIC .................................................................................................................................. 9 4.1 Bill of Materials ............................................................................................................................... 10 5. CDB LAYOUT ....................................................................................................................................... 11 6. REVISION HISTORY ............................................................................................................................ 12 LIST OF FIGURES Figure 1.Hybrid Control Resistors ............................................................................................................... 4 Figure 2.Shutdown Control Resistors ......................................................................................................... 5 Figure 3.Optional Bypass Trace Cut Locations for U1 ................................................................................ 6 Figure 4.CDB35L00-X4 Schematic ............................................................................................................. 9 Figure 5.CDB35L00-X4 Top Side Component Placement ........................................................................ 11 Figure 6.CDB35L00-X4 Bottom Side Component Placement ................................................................... 11 Figure 7.CDB35L00-X4 Layer 1 Copper ................................................................................................... 11 Figure 8.CDB35L00-X4 Layer 2 Copper ................................................................................................... 11 Figure 9.CDB35L00-X4 Layer 3 Copper ................................................................................................... 11 Figure 10.CDB35L00-X4 Layer 4 Copper ................................................................................................. 11 LIST OF TABLES Table 1. S1 Switch GAIN & MODE Configurations ..................................................................................... 3 Table 2. Hybrid Control Resistor & S1 Switch MODE Configurations ......................................................... 4 Table 3. S1 Switch Default Shutdown Configurations ................................................................................. 5 Table 4. System Input and Output Connections ......................................................................................... 8 Table 5. S1 Switch Settings ........................................................................................................................ 8 Table 6. Bill of Materials Listing ................................................................................................................ 10 2 DS913DB2