19-5599; Rev 0; 10/10 MAX98303 Evaluation Kit The MAX98303 evaluation kit (EV kit) is a fully assembled and tested PCB that evaluates the MAX98303 stereo 3.1W Class D amplifier in a 16-bump, 0.4mm pitch wafer-level package (WLP). The EV kit operates from a single 2.6V to 5.5V DC power supply and is capable of delivering 3.1W into a 4I load. The EV kit accepts a differential or single-ended audio input and provides differential outputs for the speaker. The device outputs can be connected directly to a speaker load for filterless applications; however, a filter can be added to ease evaluation. Features S 2.6V to 5.5V Single-Supply Operation S Delivers 3.1W Into a 4I Load S Single-Ended or Differential Audio Input S Five Selectable Gains S Filterless Operation S Optional Class D Output Filters for Ease of Evaluation S Low-Power Shutdown Input S Fully Assembled and Tested Ordering Information PART TYPE MAX98303EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY C1 1 C2 1 C3, C4, C17, C18 4 DESCRIPTION 0.1FF Q10%, 16V X7R ceramic capacitor (0402) Murata GRM155R71C104K TDK C1005X7R1C104K 10FF Q10%, 6.3V X7R ceramic capacitor (0805) Murata GRM21BR70J106K TDK C2012X7R0J106K 1FF Q10%, 25V X7R ceramic capacitors (0603) Murata GRM188R71E105K Murata GRM188R71E105M C5–C16, C19, C20 0 Not installed, capacitors (0603) FB1–FB4 4 0I resistors (0603) FOUTL+, FOUTL-, FOUTR+, FOUTR-, GND, VDD 6 Binding posts INL 1 White phono jack (side-entry PCB mount) INR 1 Red phono jack (side-entry PCB mount) JU1, JU4 2 2-pin headers DESIGNATION QTY JU2 1 3-pin header DESCRIPTION JU3 1 5-pin header L1–L4 0 Not installed, inductors—PCB short OUTL+, OUTL-, OUTR+, OUTR- 4 Test points R1, R2 2 100kI Q5% resistors (0603) R3–R6 0 Not installed, resistors (0603) U1 1 2.6W Class D amplifier (16 WLP) Maxim MAX98303EWE+ — 4 Shunts (JU1–JU4) — 1 PCB: MAX98303 EVALUATION KIT+ OPTIONAL COMPONENTS C7–C16 10 0.22FF Q10%, 25V X7R ceramic capacitors (0603) Murata GRM188R71E224K TDK C1608X7R1E224K L1–L4 4 22FH Q20%, 1A inductors TOKO A916CY-220M R3–R6 4 22I Q5% resistors (0603) ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Evaluates: MAX98303 General Description Evaluates: MAX98303 MAX98303 Evaluation Kit Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com TDK Corp. 847-803-6100 www.component.tdk.com TOKO America, Inc. 847-297-0070 www.tokoam.com Note: Indicate that you are using the MAX98303EWE+when contacting these component suppliers. Quick Start • MAX98303 EV kit Recommended Equipment • 2.6V to 5.5V, 2A DC power supply • Stereo audio input • Two 4I speakers Procedures The EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. 1) Verify that shunts are installed as follows: JU1, JU4: Installed (single-ended input) JU2: Pins 1-2 (device enabled) JU3: Pins 1-3 (12dB gain) 2) Set the power-supply output to 5V. Disable the power supply. 3) Connect the power-supply ground terminal to the GND pad and the power-supply positive terminal to the VDD pad of the EV kit. 4) With the audio source disabled, connect the left channel of the audio source to the INL+ pad. 5) Connect the right channel of the audio source to the INR+ pad. 6) Connect the audio source ground to the GND test pad. 7) Connect the first speaker across the OUTL+ and OUTL- test points. 8) Connect the second speaker across the OUTR+ and OUTR- test points. Detailed Description of Hardware Filterless Output The MAX98303 EV kit’s filterless outputs (OUTL+, OUTL-, OUTR+, and OUTR-) can be connected directly to a speaker load without any filtering. Use the OUTL+ and OUTL- test points or the OUTR+ and OUTR- test points to connect the speaker directly to the device output. Filtered Output Audio analyzers typically cannot accept the Class D amplifier’s pulse-width modulated (PWM) signals at their inputs. Therefore, the EV kit features optional lowpass filters at the outputs to ease evaluation. As shipped, the EV kit’s lowpass filter RC components are unpopulated and inductors L1–L4 are shorted on the PCB. To use the filtered output posts (FOUTL+, FOUTL-, FOUTR+, and FOUTR-), remove the shorts on L1–L4 and install components L1–L4, C7–C16, and R3–R6 (provided separately with the EV kit). Use the output posts to connect the filtered outputs to the audio analyzer. The default lowpass filters at the EV kit output are optimized for an 8I speaker. Jumper Selection Single-Ended/Differential Audio Inputs The EV kit features jumpers JU1 and JU4 to select between a differential or single-ended input mode. See Table 1 for JU1 and JU4 configuration. Table 1. JU1 and JU4 Jumper Selection SHUNT POSITION IN_- PIN DEVICE OPERATION Installed* AC-grounded Single-ended input Not installed AC-coupled to a user-supplied negative differential input Differential input 9) Enable the power-supply output. 10) Enable the audio source. 11) Verify that the speakers are playing the audio source signal. *Default position. 2 _______________________________________________________________________________________ MAX98303 Evaluation Kit Selectable Gain (GAIN) The EV kit features 5-pin jumper JU3 to control the device’s five programmable gain settings. See Table 3 for gain-control configuration. Table 2. JU2 Jumper Selection (SHDN) SHUNT POSITION SHDN PIN DEVICE OPERATION 1-2* Connected to PVDD Normal operation 2-3 Connected to GND Shutdown mode Table 3. JU3 Jumper Selection (GAIN) SHUNT POSITION GAIN PIN MAXIMUM GAIN (dB) 1-2 Connected to PVDD through 100kI resistor R1 9 1-3* Connected to PVDD 12 1-4 Connected to GND through 100kI resistor R2 15 1-5 Connected to GND 18 Not installed Unconnected 6 *Default position. *Default position. _______________________________________________________________________________________ 3 Evaluates: MAX98303 Shutdown Input (SHDN) The EV kit features 3-pin jumper JU2 to control the active-low shutdown input. Drive SHDN high to place the device in normal operation; drive SHDN low to place the device in the low-power shutdown mode. See Table 2 for shunt positions. Evaluates: MAX98303 MAX98303 Evaluation Kit Figure 1. MAX98303 EV Kit Schematic 4 _______________________________________________________________________________________ MAX98303 Evaluation Kit Evaluates: MAX98303 1.0” Figure 2. MAX98303 EV Kit Component Placement Guide— Component Side 1.0” Figure 3. MAX98303 EV Kit PCB Layout—Component Side 1.0” Figure 4. MAX98303 EV Kit PCB Layout—Solder Side _______________________________________________________________________________________ 5 Evaluates: MAX98303 MAX98303 Evaluation Kit Revision History REVISION NUMBER REVISION_ DATE 0 10/10 DESCRIPTION Initial release PAGES_ CHANGED — Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 6 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.