19-4926; Rev 0; 8/09 MAX9830A Evaluation Kit The MAX9830A evaluation kit (EV kit) is a fully assembled and tested circuit board that uses the MAX9830A filterless Class D amplifier to drive a mono bridge-tied-load (BTL) speaker in portable audio applications. Designed to operate from a 2.6V to 5.5V DC power supply, the EV kit is capable of delivering 2W into a 4I load. The EV kit accepts differential or single-ended input signals. The MAX9830A EV kit also evaluates the MAX9830B– MAX9830E. Features S Industry-Leading Quiescent Current 1.6mA (VDD = 5V), 1.2mA (VDD = 3.6V) S Filterless Operation Passes EN55022B-Radiated Emissions with Up to 24in (61cm) of Speaker Cable S Evaluates the MAX9830B–MAX9830E (with IC Replacement) S 2.6V to 5.5V Single-Supply Operation S 2W Mono Class D Output S Differential or Single-Ended Input S Low-Power Shutdown Input S Fully Assembled and Tested Ordering Information PART TYPE MAX9830AEVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION REQUIRED COMPONENTS C1 C2 C3, C4 C5, C6 C7–C11 1 0.1FF Q10%, 25V X7R ceramic capacitor (0603) Murata GRM188R71E104K TDK C1608X7R1E104K 1 10FF Q20%, 6.3V X5R ceramic capacitor (0603) Murata GRM188R60J106M TDK C1608X5R0J106M 0 Not installed, ceramic capacitors (0603) 2 0.47FF Q10%, 10V X7R ceramic capacitors (0603) TDK C1608X7R1A474K Murata GRM188R61A474K 5 0.22FF Q10%, 25V X7R ceramic capacitors (0603) Murata GRM188R71E224K TDK C1608X7R1E224K DESIGNATION QTY DESCRIPTION REQUIRED COMPONENTS JU1 1 3-pin header JU2 1 2-pin header L1, L2 0 Not installed, inductors L3, L4 2 0I resistors (0805) L5 1 OUT-, OUT+, 2 Ferrite bead, 100I at 100MHz, 50mI DCR, 3A (0603) TDK MPZ16085101A Test points R1, R2 2 22I Q5% resistors (0603) U1 1 Mono Class D amplifier (8 TDFN) Maxim MAX9830AETA+ — 2 Shunts — 1 PCB: MAX9830A EVALUATION KIT+ OPTIONAL COMPONENTS L1, L2 2 22FH Q20%, 0.7A inductors TOKO A915AY-220M ________________________________________________________________ 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: MAX9830A–MAX9830E General Description Evaluates: MAX9830A–MAX9830E MAX9830A Evaluation Kit 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 MAX9830A when contacting these component suppliers. Quick Start Detailed Description of Hardware Recommended Equipment The MAX9830A EV kit features the MAX9830A filterless Class D amplifier IC, designed to drive a BTL mono speaker in portable audio applications. The EV kit operates from a DC power supply that provides 2.6V to 5.5V and 1A of current. The EV kit accepts a differential or single-ended audio input. The audio input source is amplified to drive 2W into a 4I speaker. U 2.6V to 5.5V, 1A DC supply U 4I speaker U Mono audio signal source Procedure The MAX9830A 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: Pins 1-2 (device enabled) JU2: Installed (single-ended input) 2) Set the power-supply output to 5V. The EV kit provides two sets of differential outputs. The device outputs (OUT+, OUT-) can be connected directly to a speaker load, without any filtering, with up to 24in (61cm) of cable. However, a filter can be added to ease evaluation. Speaker Amplifier Shutdown Jumper JU1 enables or disables the speaker amplifier. See Table 1 for jumper JU1 configuration. Input Mode 3) Disable the power-supply output. 4) Connect the power-supply ground to the GND pad and the power-supply positive output to the VDD pad on the EV kit. Jumper JU2 provides the option to select between a differential or single-ended input mode for the EV kit. See Table 2 for JU2 configuration. 5) Verify that the audio source output is disabled. Table 1. Shutdown Input (JU1) 6) Connect the mono audio source between the INPUT+ and INPUT- pads on the EV kit. 7) Connect the speaker across the OUT+ and OUTtest points. 8) Enable the power-supply output. 9) Enable the audio source. 10) Verify that the speaker is playing the audio source signal. SHUNT POSITION 1-2* 2-3 *Default position. SHDN PIN AMPLIFIER Connected to VDD Connected to GND Enabled Disabled Table 2. JU2 Settings SHUNT POSITION IN- PIN INPUT MODE Installed* Connected to GND Singleended input Not installed Connected to user-supplied negative differential input Differential input *Default position. 2 _______________________________________________________________________________________ MAX9830A Evaluation Kit The MAX9830A EV kit also features PCB pads for a lowpass filter that can be added to ease evaluation. Audio analyzers typically cannot accept the Class D amplifier’s pulse-width-modulated (PWM) waveform at their inputs. The lowpass filter extracts the audio content from the PWM output signal and allows the device to be connected directly to an audio analyzer. The PWM output signal can be lowpass filtered by installing 22µH ±20%, 0.7A inductors (TOKO A915AY-220M) at L1 and L2. The filtered outputs should then be monitored at the FOUT+ and FOUT- pads. Figure 1. MAX9830A EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX9830A–MAX9830E Optional Output Filtering The MAX9830A is designed to pass EN55022B emissions standards without any filtering when using up to 61cm of cable to connect the speaker. When evaluating the MAX9830A without any filtering, connect the speaker to the outputs (OUT+, OUT-). Evaluates: MAX9830A–MAX9830E MAX9830A Evaluation Kit 1.0” Figure 2. MAX9830A EV Kit Component Placement Guide— Component Side 1.0” Figure 3. MAX9830A EV Kit PCB Layout—Component Side 1.0” Figure 4. MAX9830A EV Kit PCB Layout—Solder Side 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. 4 © 2009 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.