19-5218; Rev 0; 4/10 MAX98302 Evaluation Kit The MAX98302 evaluation kit (EV kit) is a fully assembled and tested PCB that evaluates the MAX98302 stereo 2.4W Class D amplifier. The EV kit operates from a single 2.6V to 5.5V DC power supply. 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 Input S Fully Assembled and Tested Ordering Information PART TYPE MAX98302EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION 1 10FF Q20%, 10V X7R ceramic capacitor (0805) Murata GRM21BR71A106K C2 1 0.1FF Q10%, 16V X7R ceramic capacitor (0603) Murata GRM188R71C104K C3, C4, C17, C18 4 1FF Q10%, 10V X7R ceramic capacitors (0603) Murata GRM188R61A105K C5, C6, C20, C21 0 C1 Not Installed, capacitors (0603) C7-C16 10 0.22FF Q10%, 25V X7R ceramic capacitors (0603) Murata GRM188R71E224K FB1-FB4 4 0I Q5% resistors (0603) JU1, JU4 2 2-pin headers DESIGNATION QTY DESCRIPTION JU2 1 3-pin header JU3 1 5-pin header L1-L4 0 Not installed, 22FH Q20%, 1.29A inductors TOKO A916CY-220M (provided with EV kit) OUTL+, OUTR+ 2 Red multipurpose test points OUTL-, OUTR- 2 White multipurpose test points R1, R2 2 100kI Q5% resistors (0603) R3, R4, R7, R8 4 22I Q5% resistors (0603) U1 1 2W Class D amplifier (14 TDFN-EP*) Maxim MAX98302ETD+ -- 4 Shunts -- 1 PCB: MAX98302 EVALUATION KIT+ *EP = Exposed pad. Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com TOKO America, Inc. 847-297-0070 www.tokoam.com Note: Indicate that you are using the MAX98302 when contacting these component suppliers. ________________________________________________________________ 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: MAX98302 General Description Evaluates: MAX98302 MAX98302 Evaluation Kit Quick Start Recommended Equipment * 2.6V to 5.5V, 2A DC power supply * Stereo audio input * Two 8I speakers Procedure The MAX98302 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 PVDD pad on the EV kit. Detailed Description of Hardware Filterless Output The MAX98302 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 MAX98302 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. To use the filtering output pads (FOUTL+, FOUTL-, FOUTR+, and FOUTR-), install inductors L1-L4 (provided separately with the EV kit), connect the loads to the output pads, and connect the filtered outputs to the audio analyzer. The default lowpass filters at the EV kit output are optimized for an 8 speaker. Jumper Selection 4) With the audio source disabled, connect the left channel of the audio source to the INL+ test pad. 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 shunt positions. 5) Connect the right channel of the audio source to the INR+ test pad. Table 1. JU1 and JU4 Jumper Selection 6) Connect the audio source ground to the GND test pad. SHUNT POSITION IN_- PIN Device Operation 7) Connect the first speaker across the OUTL+ and OUTL- test points. Installed* AC-grounded Single-ended input 8) Connect the second speaker across the OUTR+ and OUTR- test points. Not installed AC-coupled to usersupplied negative differential input Differential input 9) Enable the power-supply output. *Default position. 10) Enable the audio source. 11) Verify that the speakers are playing the audio source signal. 2 _______________________________________________________________________________________ MAX98302 Evaluation Kit Selectable Gain (GAIN) The EV kit features 5-pin jumper JU3 to control the MAX98302's five programmable gain settings. See Table 3 for gain control configuration. Table 2. JU2 Jumper Selection (SHDN) Table 3. JU3 Jumper Selection (GAIN) SHUNT POSITION SHDN PIN Device Operation 1-2* Connected to PVDD Normal operation 2-3 Connected to PGND Shutdown mode *Default position. 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 PGND through 100kI resistor R2 15 1-5 Connected to PGND 18 Not installed Unconnected 6 *Default position. _______________________________________________________________________________________ 3 Evaluates: MAX98302 Shutdown Function (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: MAX98302 MAX98302 Evaluation Kit Figure 1. MAX98302 EV Kit Schematic 4 _______________________________________________________________________________________ MAX98302 Evaluation Kit Figure 2. MAX98302 EV Kit Component Placement Guide-- Component Side 1.0" Figure 3. MAX98302 EV Kit PCB Layout--Component Side 1.0" Figure 4. MAX98302 EV Kit PCB Layout--Solder Side _______________________________________________________________________________________ 5 Evaluates: MAX98302 1.0" MAX98302 Evaluation Kit Evaluates: MAX98302 Revision History REVISION NUMBER REVISION DATE 0 4/10 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 (c) 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. Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX98302EVKIT+