19-5609; Rev 0; 10/10 MAX98304 Evaluation Kit The MAX98304 evaluation kit (EV kit) is a fully assembled and tested circuit board that uses the MAX98304 filterless Class D amplifier to drive a speaker in portable audio applications. The EV kit comes with a MAX98304EWL+ in a 9-bump, 0.3mm pitch wafer-level package (WLP). Designed to operate from a 2.5V to 5.5V DC power supply, the EV kit is capable of delivering 3.2W into a 4I load. The EV kit accepts differential or single-ended input signals. Features S Filterless Operation Passes Radiated Emissions with 60cm of Speaker Cable S 2.5V to 5.5V Single-Supply Operation S 3.2W Mono Class D Output S Selectable Gain Control S Differential or Single-Ended Input S Low-Power Shutdown Input S Fully Assembled and Tested Ordering Information PART TYPE MAX98304EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY 1 5-pin, 4-way header 1 10µF Q20%, 6.3V X5R ceramic capacitor (0603) Murata GRM188R60J106M JU3 C1 L1, L2 0 C2 1 0.1µF Q10%, 16V X7R ceramic capacitor (0402) Murata GRM155R71C104K Not installed, inductors— shorted with PCB trace; provided with the EV kit: 22µH Q20%, 1A inductors TOKO A916CY-220M C3, C4 2 0.47µF Q10%, 10V X5R ceramic capacitors (0402) Murata GRM155R61A474K FOUT+, FOUT-, PVDD, PGND 4 Binding posts OUT+, OUT- 2 1-pin headers Not installed, ceramic capacitors (0603) R1, R2 2 100kI Q5% resistors (0402) Not installed, ceramic capacitors (0603); provided with the EV kit: 0.22µF Q10%, 25V X7R ceramic capacitors (0603) Murata GRM188R71E224K R3, R4 0 Not installed, resistors (0603); provided with the EV kit: 22I Q5% resistors (0603) U1 1 Mono Class D amplifier (9 WLP) Maxim MAX98304EWL+ (Top Mark: AIR) — 3 Shunts — 1 PCB: MAX98304 EVALUATION KIT+ C5, C6 C7–C11 0 0 FB1, FB2 2 0I Q5% resistors (0603) INPUT 1 Black RCA jack JU1 1 2-pin header JU2 1 3-pin header DESCRIPTION ________________________________________________________________ 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: MAX98304 General Description Evaluates: MAX98304 MAX98304 Evaluation Kit Component Suppliers SUPPLIER PHONE Murata Electronics North America, Inc. 770-436-1300 WEBSITE www.murata-northamerica.com TOKO America, Inc. 847-297-0070 www.tokoam.com Note: Indicate that you are using the MAX98304EWL+ when contacting these component suppliers. • MAX98304 EV kit Quick Start Detailed Description of Hardware Recommended Equipment The MAX98304 EV kit features the MAX98304 filterless Class D amplifier, designed to drive a mono speaker in portable audio applications. The EV kit comes with a MAX98304EWL+ in a 9-bump, 0.3mm pitch WLP. The EV kit operates from a DC power supply that provides 2.5V to 5.5V and 2A of current. The EV kit accepts a differential or single-ended audio input. The audio input source is amplified to drive 3.2W into a 4I speaker. • 5V, 2A DC supply • 4I speaker • Mono audio signal source 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. 1) Verify that shunts are installed as follows: JU1: Installed (single-ended input) JU2: Pins 1-2 (device enabled) JU3: Pins 1-5 (12dB gain) 2) Connect the power-supply positive and negative outputs to the PVDD and PGND pads or binding posts on the EV kit, respectively. JU1 configures the EV kit inputs for single-ended or differential operation. JU2 enables or disables the speaker amplifier. The amplifier overall gain can be set between 0dB and +12dB using JU3. The EV kit provides a set of differential outputs. The device outputs (FOUT+, FOUT-) can be connected directly to a speaker load without any filtering with 60cm of cable. However, filter components can be added to ease evaluation. See the Filtered Output section for additional information. Input Mode 3) Verify that the audio source output is disabled. JU1 provides the option to select between a differential or single-ended input mode for the EV kit. See Table 1 for JU1 configuration. 4) Connect the mono audio source to the INPUT RCA jack or between the IN+ and IN- pads on the EV kit. Table 1. Input Mode (JU1) 5) Connect the speaker across the FOUT+ and FOUTtest points. 6) Set the power-supply output to 5V. 7) Enable the power-supply output. 8) Enable the audio source. 9) Verify that the speaker is playing the audio source signal. SHUNT POSITION IN- PCB PAD INPUT MODE Installed* Connected to PGND Single-ended input Not installed Connected to a user-supplied negative differential input Differential input *Default position. 2 _______________________________________________________________________________________ MAX98304 Evaluation Kit Gain Setting The EV kit maximum signal gain can be configured to five different settings. JU3 selects the overall gain for the EV kit. See Table 3 for JU3 configuration. The IC can pass CE EN55022B regulations with 60cm of speaker cable and no filtering. However, ferrite-bead filters can be used to achieve further attenuation of radiated emissions. To install the ferrite-bead filters, replace shorting resistors FB1 and FB2 with 0603 or smaller ferrite beads and install filter capacitors on the C5 and C6 pads. The speaker wire should be connected to the FOUT+ and FOUT- pads. Filtered Output Audio analyzers typically cannot accept pulse-widthmodulated (PWM) signals at their inputs. Therefore, the EV kit features the option to install a lowpass filter at its outputs to ease evaluation. OUT+ and OUT- are shorted to FOUT+ and FOUT-. The trace must be broken at L1 and L2 before installing inductors L1 and L2 (provided with the EV kit). The filter components (C7–C11, R3, and R4) are provided with the EV kit and must be installed prior to operation. Use FOUT+ and FOUT- to connect the filtered PWM outputs to an audio analyzer. The default lowpass filter at the EV kit outputs is optimized for an 8I speaker. Contact the factory for the 4I speaker filter. Table 2. Shutdown (JU2) SHUNT POSITION 1-2* 2-3 *Default position. SHDN PIN AMPLIFIER Connected to PVDD Connected to PGND Enabled Disabled Filterless Output The EV kit’s filterless outputs (OUT+ and OUT-) can be connected directly to a speaker load without any filtering. Use the OUT+ and OUT- test points or the FOUT+ and FOUT- pads to connect a speaker directly to the IC outputs. Inductors L1 and L2 are not installed for maximum efficiency. Table 3. Gain Setting (JU3) SHUNT POSITION GAIN PIN MAXIMUM GAIN (dB) Open Not connected 0 1-2 Connected to PVDD through R1 +3 1-3 Connected to PVDD +6 1-4 Connected to PGND through R2 +9 Connected to PGND +12 1-5* *Default position. _______________________________________________________________________________________ 3 Evaluates: MAX98304 Shutdown JU2 enables or disables the audio speaker amplifier. See Table 2 for JU2 configuration. Evaluates: MAX98304 MAX98304 Evaluation Kit Figure 1. MAX98304 EV Kit Schematic 4 _______________________________________________________________________________________ MAX98304 Evaluation Kit Figure 2. MAX98304 EV Kit Component Placement Guide— Component Side 1.0” Figure 3. MAX98304 EV Kit PCB Layout—Component Side 1.0” Figure 4. MAX98304 EV Kit PCB Layout—Solder Side _______________________________________________________________________________________ 5 Evaluates: MAX98304 1.0” MAX98304 Evaluation Kit Evaluates: MAX98304 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 © 2010 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.