19-5979; Rev 0; 7/11 MAX98309 Evaluation Kit Evaluates: MAX98309/MAX98310 General Description Features The MAX98309 evaluation kit (EV kit) is a fully assembled and tested circuit board that evaluates the MAX98309 mono 1.4W Class AB audio amplifier. The amplifier gain can be set through external resistors. The EV kit operates from a single 2.5V to 5.5V power supply. S2.5V to 5.5V Single-Supply Operation The EV kit can also evaluate the MAX98310 internally fixed gain mono 1.4W Class AB audio amplifier. SProven PCB Layout SDifferential or Single-Ended Input SPin-Selectable Turn-On Time S1.8V Logic-Compatible SHDN Input SFully Assembled and Tested Ordering Information appears at end of data sheet. Component List DESIGNATION C1, C2, C3 C4 C5 QTY 3 DESCRIPTION DESIGNATION QTY JU1 1 3-pin header JU2 1 4-pin header JU3 1 2-pin header 1FF Q10%, 16V X5R ceramic capacitors (0402) TDK C1005X5R1C105K DESCRIPTION 10FF Q10%, 6.3V X5R ceramic capacitor (0603) Murata GRM188R60J106K R1–R4 4 10kI Q1% resistors (0402) 1 SHDN 1 PCB miniature red test point U1 1 1 0.1FF Q10%, 16V X7R ceramic capacitor (0402) Murata GRM155R71C104K Mono 1.4W Class AB audio amplifier (9 WLP) Maxim MAX98309EWL+ — 3 Shunts — 1 PCB: MAX98309 EVALUATION KIT GND, OUT+, OUT-, VDD 4 Binding posts IN 1 White side-entry, PCB-mount phono jack 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 Note: Indicate that you are using the MAX98309 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. MAX98309 Evaluation Kit Evaluates: MAX98309/MAX98310 Quick Start Recommended Equipment • MAX98309 EV kit • 2.5V to 5.5V DC supply • 8I speaker • Mono audio signal source Shutdown Mode (SHDN) The EV kit features 2-pin jumper JU1 to control the activelow shutdown input of the IC. 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 1 for shunt positions. Turn-On Time Procedure 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. The MAX98309/MAX98310 have excellent click-and-pop performance with respect to the SHDN pin activation/ deactivation. JU1: Pins 2-3 (device enabled) Jumper JU2 demonstrates the IC’s selectable turn-ontime feature for optimized click-and-pop performance. Connect TON to GND for a 10ms turn-on time. Connect TON to VDD for a 100ms turn-on time. See Table 2 for selectable turn-on times. JU2: Pins 1-2 (turn-on time of 100ms) The MAX98310 has a preset 5ms turn-on time. 1) Verify that shunts are installed as follows: JU3: Installed (single-ended input) 2) Connect the positive terminal of the power supply to the VDD PCB pad on the EV kit. Connect the negative terminal of the power supply to the GND PCB pad on the EV kit. Amplifier Gain The EV kit provides resistors R1–R4 to externally set the differential gain. The default gain is 1V/V or 0dB. Set the gain of the amplifier as follows: AV = 4) Verify that the audio source output is disabled. 5) Connect the single-ended mono audio source to the IN phono jack or between the IN+ and IN- PCB pads on the EV kit. 6) Connect the speaker across the OUT+ and OUTtest pads. 7) Set the power-supply output to 3.7V. 8) Enable the power-supply output. 9) Enable the audio source. 10) Verify that the speaker is playing the audio source signal. Detailed Description of Hardware The MAX98309 EV kit is a fully assembled and tested circuit board that evaluates the MAX98309 mono 1.4W Class AB audio amplifier. The amplifier gain can be set through external resistors. The EV kit can also evaluate the MAX98310 internally fixed gain mono 1.4W Class AB audio amplifier. To evaluate the MAX98310, remove R2 and R4, and replace R1 and R3 with 0I resistors. RF RIN where AV is the desired voltage gain, RF is the value of feedback resistors R2 and R4, and RIN is the value of input resistors R1 and R3. When evaluating the MAX98310, jumper JU2 controls the GAIN input pin and selects the four internally fixed differential gain options. See Table 2 for selectable gain options. Input Mode Jumper JU3 provides the option to select between a differential or single-ended input mode for the EV kit. See Table 3 for jumper JU3 configurations. Table 1. Shutdown Mode (JU1) SHUNT POSITION SHDN PIN DEVICE OPERATION 1-2 2-3* Connected to GND Connected to VDD Disabled Enabled *Default position. __________________________________________________________________ Maxim Integrated Products 2 MAX98309 Evaluation Kit Evaluates: MAX98309/MAX98310 Table 2. Turn-On Time (JU2) TON PIN (MAX98309) GAIN PIN (MAX98310) MAX98309 TURN-ON TIME (ms) 1-2* Connected to VDD 100 0 1-3 Connected to BIAS N/A 9 1-4 Connected to GND 10 3 Open Unconnected N/A 6 SHUNT POSITION MAX98310 GAIN (dB) *Default position. Table 3. Input Mode Setting (JU3) SHUNT POSITION IN- PCB PAD INPUT MODE Installed* Not installed Connected to GND Connected to a user-supplied negative differential input Single-ended input Differential input *Default position. __________________________________________________________________ Maxim Integrated Products 3 MAX98309 Evaluation Kit Evaluates: MAX98309/MAX98310 Figure 1. MAX98309 EV Kit Schematic __________________________________________________________________ Maxim Integrated Products 4 MAX98309 Evaluation Kit Evaluates: MAX98309/MAX98310 1.0’’ Figure 2. MAX98309 EV Kit Component Placement Guide— Component Side 1.0’’ Figure 3. MAX98309 EV Kit PCB Layout—Component Side 1.0’’ Figure 4. MAX98309 EV Kit PCB Layout—GND Layer 2 __________________________________________________________________ Maxim Integrated Products 5 MAX98309 Evaluation Kit Evaluates: MAX98309/MAX98310 1.0’’ Figure 5. MAX98309 EV Kit PCB Layout—VDD Layer 3 1.0’’ Figure 6. MAX98309 EV Kit PCB Layout—Solder Side __________________________________________________________________ Maxim Integrated Products 6 MAX98309 Evaluation Kit Evaluates: MAX98309/MAX98310 Ordering Information PART TYPE MAX98309EVKIT# EV Kit #Denotes RoHS compliant. __________________________________________________________________ Maxim Integrated Products 7 MAX98309 Evaluation Kit Evaluates: MAX98309/MAX98310 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 8 Maxim is a registered trademark of Maxim Integrated Products, Inc.