19-5982; Rev 0; 7/11 MAX98306 Evaluation Kit Evaluates: MAX98306 General Description The MAX98306 evaluation kit (EV kit) is a fully assembled and tested PCB that evaluates the MAX98306 stereo 3.2W Class D amplifier. The EV kit operates from a single 2.6V to 5.5V DC power supply and is capable of delivering 3.2W 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 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 Mode S Proven PCB Layout S Fully Assembled and Tested Ordering Information appears at end of data sheet. Component List DESIGNATION QTY C1 1 C2 1 DESCRIPTION DESIGNATION QTY 0.1FF Q10%, 16V X7R ceramic capacitor (0402) Murata GRM155R71C104K TDK C1005X7R1C104K OUTL-, OUTL+, OUTR-, OUTR+ 4 Test points R1, R2 2 100kI Q5% resistors (0603) R3–R6 0 Not installed, resistors (0603) U1 1 3.2W Class D amplifier (14 TDFN) Maxim MAX98306ETD+ — 4 Shunts — 1 PCB: MAX98306 EVALUATION KIT 10FF Q10%, 6.3V X7R ceramic capacitor (0805) Murata GRM21BR70J106K TDK C2012X7R0J106K 4 1FF Q10%, 25V X7R ceramic capacitors (0603) Murata GRM188R71E105K Murata GRM188R71E105M C5–C16, C19, C20 0 Not installed, ceramic capacitors (0603) FB1–FB4 4 0I resistors (0603) FOUTL+, FOUTL-, FOUTR+, FOUTR-, GND, VDD 6 Binding posts 1 White phono jack (side-entry PCB mount) INR 1 Red phono jack (side-entry PCB mount) JU1, JU4 2 2-pin headers JU2 1 3-pin header JU3 1 5-pin header L1–L4 0 Not installed, inductors—short (PC trace) C3, C4, C17, C18 INL DESCRIPTION OPTIONAL COMPONENTS FOR 8I SPEAKER 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) OPTIONAL COMPONENTS FOR 4I SPEAKER C7–C16 10 0.47FF Q10%, 25V X7R ceramic capacitors (0603) Murata GRM188R71E474K TDK C1608X7R1E474K L1–L4 4 10FH Q20%, 1.4A inductors TOKO A916CY-100M R3–R6 4 10I 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. MAX98306 Evaluation Kit Evaluates: MAX98306 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 MAX98306 when contacting these component suppliers. Quick Start • MAX98306 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 PCB pad and the power-supply positive terminal to the VDD PCB pad on the EV kit. 4) With the audio source disabled, connect the left channel of the audio source to the INL phono jack or the INL+ test pad. 5) Connect the right channel of the audio source to the INR phono jack or the INR+ test 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. 9) Enable the power-supply output. 10)Enable the audio source. 11)Verify that the speakers are playing the audio source signal. Detailed Description of Hardware Filterless Output The MAX98306 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 MAX98306 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 the L1–L4 inductors 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. Additional filter components are provided with the EV kit for either a 4I or 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 configurations. Shutdown Function (SHDN) The EV kit features a 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 low-power shutdown mode. See Table 2 for shunt positions. Selectable Gain (GAIN) The EV kit features a 5-pin jumper (JU3) to control the IC’s five programmable gain settings. See Table 3 for gain-control configuration. __________________________________________________________________ Maxim Integrated Products 2 MAX98306 Evaluation Kit Evaluates: MAX98306 Table 1. JU1 and JU4 Jumper Selection SHUNT POSITION IN_- PIN DEVICE OPERATION Installed* AC-grounded Single-ended input Not installed AC-coupled to user-supplied negative differential input Differential input *Default position. Table 2. JU2 Jumper Selection (SHDN) SHUNT POSITION DEVICE OPERATION 1-2* SHDN PIN Connected to PVDD 2-3 Connected to PGND Shutdown mode Normal operation *Default position. Table 3. JU3 Jumper Selection (GAIN) SHUNT POSITION GAIN PIN 1-2 Connected to PVDD through 100kI resistor R1 MAXIMUM GAIN (dB) 9 1-3* Connected to PVDD 12 1-4 Connected to PGND through 100kI resistor R2 15 1-5 Connected to PGND 18 Not installed Unconnected 6 *Default position. __________________________________________________________________ Maxim Integrated Products 3 MAX98306 Evaluation Kit Evaluates: MAX98306 Figure 1. MAX98306 EV Kit Schematic __________________________________________________________________ Maxim Integrated Products 4 MAX98306 Evaluation Kit Evaluates: MAX98306 1.0” Figure 2. MAX98306 EV Kit Component Placement Guide— Component Side 1.0” Figure 3. MAX98306 EV Kit PCB Layout—Component Side 1.0” Figure 4. MAX98306 EV Kit PCB Layout—Solder Side __________________________________________________________________ Maxim Integrated Products 5 MAX98306 Evaluation Kit Evaluates: MAX98306 Ordering Information PART TYPE MAX98306EVKIT# EV Kit #Denotes RoHS compliant. __________________________________________________________________ Maxim Integrated Products 6 MAX98306 Evaluation Kit Evaluates: MAX98306 Revision History REVISION NUMBER REVISION DATE 0 7/11 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2011 Maxim Integrated Products 7 Maxim is a registered trademark of Maxim Integrated Products, Inc.