19-6275 Rev 0 4/12 MAX98502 Evaluation Kit Evaluates: MAX98502 General Description Features The MAX98502 evaluation kit (EV kit) is a fully assembled S 2.5V to 5.5V Single-Supply Operation and tested circuit board that uses the MAX98502 boost- S 4W Mono Class D Output ed Class D amplifier to drive a mono bridge-tied-load S Selectable Gain: +6dB, +15.5dB, and +20dB (BTL) speaker in portable audio applications. Designed S Boosted Class D Output to operate from a 2.5V to 5.5V DC power supply, the EV kit is capable of delivering 2.2W into an 8I load or 4W S Differential or Single-Ended Input into a 4I load. The EV kit accepts differential or single- S Boost Converter Shutdown ended input signals, features selectable gain, and sepa- S Speaker Output Shutdown rate speaker and boost shutdown inputs. S Proven PCB Layout S Fully Assembled and Tested Ordering Information appears at end of data sheet. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION Not installed, ferrite beads 10FF Q10%, 6.3V X7R ceramic FB2, FB3 0 (0603) capacitor (0805) C1 1 Murata GRM21BR70J106K Phono jack, black J1 1 TDK C2012X7R0J106K (side-entry PCB mount) JU1, JU2, JU3 3 3-pin headers 22FF Q20%, 16V X5R ceramic JU4 1 2-pin header capacitor (1206) C2 1 Murata GRM31CR61C226M 2.2FH, 91mI, 1.5A inductor Taiyo Yuden EMK316BJ226M L1 1 (3.2mm x 2.5mm) Murata LQH32PN2R2NN0 1FF Q10%, 25V X7R ceramic L2, L3 0 Not installed, inductors capacitors (0603) C3, C4 2 Murata GRM188R71E105K OUT-, OUT+, 4 Test points Murata GRM188R71E105M RKNEE, PGND R1 1 27.4kI Q1% resistor (0603) 22FF Q10%, 6.3V X5R ceramic R2, R3 2 22I Q5% resistors (0603) capacitor (0805) C5 1 Murata GRM21BR60J226M Boosted Class D audio TDK C2012X5R0J226K U1 1 amplifier (16 WLP) Maxim MAX98502EWE+ 0.1FF Q10%, 16V X7R ceramic VCCOUT 0 Not installed, test point capacitor (0402) C8 1 Murata GRM155R71C104K 4 Shunts TDK C1005X7R1C104K PCB: MAX98502 EVALUATION 1 KIT Not installed, ceramic C12, C13 0 capacitors (0603) OPTIONAL COMPONENTS 22FH Q20%, 2A inductors 0.22FF Q10%, 25V X7R ceramic L2, L3 2 (D75LC) capacitors (0603) C14C18 5 TOKO B1047AS-220M Murata GRM188R71E224K TDK C1608X7R1E224K Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX98502 Evaluation Kit Evaluates: MAX98502 Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Taiyo Yuden 800-348-2496 www.t-yuden.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 MAX98502 when contacting these component suppliers. Quick Start Detailed Description of Hardware The MAX98502 EV kit features the MAX98502 boosted Recommended Equipment Class D amplifier IC, designed to drive a BTL mono MAX98502 EV kit speaker in portable audio applications. The EV kit accepts 2.5V to 5.5V, 4A DC supply a differential or single-ended audio input, features three 8I or 4I speaker selectable gain settings, and provides two active-low shutdown inputs for flexibility. The audio input source is Mono audio signal source amplified to drive 2.2W into an 8I speaker or 4W into an Procedure 4I speaker. The EV kit operates from a single DC power The EV kit is fully assembled and tested. Follow the steps supply that can provide 2.5V to 5.5V. below to verify board operation. Caution: Do not turn on The EV kit provides two sets of differential outputs. The the power supply until all connections are completed. device outputs (OUT+/OUT-) can be connected directly 1) Verify that shunts are installed as follows: to a speaker load, without any filtering, with up to 24in of cable. However, a filter can be added to ease evaluation. JU1: Open (+15.5dB gain) JU2: Pins 1-2 (speaker enabled) Selectable Gain Setting The IC features three internal gain settings that are JU3: Pins 1-2 (boost enabled) selectable with the GAIN input. Jumper JU1 controls the JU4: Short (single-ended/unbalanced input) amplifiers gain select input. See Table 1 for JU1 con- 2) Set the power-supply output to 3.6V. figuration. 3) Disable the power-supply output. Table 1. GAIN Input (JU1) 4) Connect the power-supply ground to the PGND PCB pad and the power-supply positive output to the SHUNT GAIN SETTING GAIN PIN VBAT PCB pad on the EV kit. Keep VBAT lengths < POSITION (dB) 8in (and twisted to minimize inductance) to ensure 2-3 Connected to AGND +6 proper device operation. Not installed* Unconnected +15.5 5) Verify that the audio source output is disabled. 1-2 Connected to VBAT +20 6) Connect the mono audio source between the IN+ and *Default position. IN- PCB pads or J1 on the EV kit. 7) Connect the speaker across the OUT+ and OUT- test Shutdown Inputs points. The IC features two active-low shutdown inputs (SDSPK and SDBST). Jumper JU2 enables or disables the 8) Enable the power-supply output. speaker amplifier (SDSPK) and jumper JU3 controls the 9) Enable the audio source. boost converter (SDBST). See Table 2 for JU2 and JU3 10) Verify that the speaker is playing the audio source configuration. The boost must be enabled for the speaker signal. amplifier to enable. Maxim Integrated Products 2