19-5985 Rev 0 7/11 MAX98307 Evaluation Kit Evaluates: MAX98307 General Description Features The MAX98307 evaluation kit (EV kit) is a fully assembled S Filterless Operation Passes Radiated Emissions and tested circuit board that evaluates the MAX98307 with Up to 30cm of Speaker Cable filterless Class DG multilevel amplifier to drive a speaker S 2.6V to 5.25V Single-Supply Operation in portable audio applications. The EV kit comes with a S Delivers Up to 3.3W Into an 8I Speaker MAX98307 IC in a 16-pin TQFN-EP package. Designed S Configurable Gain Control to operate from a 2.6V to 5.25V DC power supply, the EV kit is capable of delivering 3.3W into an 8I load. The EV S Differential or Single-Ended Input kit accepts a differential or a single-ended input signal. S Low-Power Shutdown Input 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 MINIMAL COMPONENTS FOR CUSTOMER DESIGN Not installed, capacitors (0603) C9C13 0 Recommended: 0.1FF Q10%, 16V X7R ceramic Murata GRM188R71C224K C1, C2, C3 3 capacitors (0603) Murata GRM188R71C104K C14C17 0 Not installed, capacitors (0603) FOUT-, FOUT+, 0.33FF Q10%, 16V X7R ceramic 4 Binding posts PGND, PVDD C4, C5 2 capacitors (0603) Murata GRM188R71C334K Red, right-angle, PC-mount IN 1 RCA jack 4.7FF Q10%, 16V X7R ceramic C6 1 capacitor (0805) JU1 1 3-pin header Murata GRM21BR71C475K JU2 1 2-pin header 10FF Q20%, 6.3V X5R ceramic Not installed, inductorsshort C7 1 capacitor (0603) (PC trace) L1, L2 0 Murata GRM188R60J106M Recommended: Sumida CDRH65-220M R1, R2 2 10kI Q1% resistors (0603) R3, R4 2 20kI Q1% resistors (0603) OUT- 1 Black test point, 63 mil drill size OUT+ 1 Red test point, 63 mil drill size Class DG audio amplifier U1 1 (16-TQFN-EP) Not installed, resistors (0603) Maxim MAX98307ETE+ R5, R6 0 Recommended: 22I Q5% resistors (0603) OPTIONAL COMPONENTS FOR CUSTOMER EVALUATION R7, R8 2 0I Q5% resistors (0603) C1N, PVSS 2 White test points, 40 mil drill size SU1, SU2 2 Shunts (JU1, JU2) C1P 1 Red test point, 40 mil drill size Not installed, test point TP0 0 (15 mil drill size) 10FF Q20%, 6.3V X5R ceramic C8 1 capacitor (0603) PCB: MAX98307 EVALUATION 1 Murata GRM188R60J106M KIT 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.MAX98307 Evaluation Kit Evaluates: MAX98307 Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Sumida Corp. 847-545-6700 www.sumida.com Note: Indicate that you are using the MAX98307 when contacting these component suppliers. Customizing the Gain Quick Start The EV kit is shipped with a gain of +14.5dB. Change the resistors (R1R4) to customize the gain of the EV kit. Refer Recommended Equipment to the MAX98307/MAX98308 IC data sheet for details. MAX98307 EV kit 2.6V to 5.25V, 2A power supply Filterless Output The EV kit is shipped with filterless outputs by default. Audio source (e.g., CD player, MP3 player, etc.) The EV kits filterless outputs, available at the OUT+, 8I speaker OUT- test points or the FOUT+, FOUT- binding posts, can be connected directly to a speaker load without any Procedure filtering. Use the OUT+, OUT- test points or the FOUT+, The EV kit is fully assembled and tested. Follow the steps FOUT- binding posts to connect a speaker directly to the listed below to verify board operation. Caution: Do not devices outputs. turn on the power supply until all connections are completed. Filtered Output 1) Install a shunt on pins 1-2 on jumper JU1 (EV kit on). Audio analyzers typically cannot accept pulse-width- modulated (PWM) signals at their inputs. Therefore, the 2) Verify that a shunt is not installed on jumper JU2 EV kit provides component footprints for a lowpass filter (differential input mode) at its outputs to ease evaluation. Cut open the PCB traces 3) Connect the 8I speaker across the FOUT- and between inductor L1 and L2 pads. Install inductors L1, FOUT+ PCB pads. L2, capacitors C9C13, and resistors R5, R6 (provided 4) Connect the positive terminal of the power supply to with the EV kit) and use the filtering output binding posts the PVDD PCB pad and the ground terminal to the (FOUT- and FOUT+) to connect the filtered PWM outputs PGND PCB pad. to the audio analyzer. The default lowpass filter at the EV kit outputs is optimized for an 8I speaker. 5) Connect the audio source output to the IN RCA jack. The IC can pass CE EN55022B regulations with up to 6) Connect the ground terminal of the audio source to 30cm of speaker cable and no filtering. However, ferrite- the PGND PCB pad. bead filters can be used to achieve further attenuation 7) Turn on the audio source. of radiated emissions. To install the ferrite-bead filters, 8) Turn on the power supply. verify that filter inductors L1 and L2 are not installed. Next, replace shorting resistors R7 and R8 with 0603 or Detailed Description of Hardware smaller ferrite beads and install filter capacitors on the C14 and C15 pads. The speaker wire should be con- The MAX98307 EV kit features the MAX98307 filterless nected to the OUT- and OUT+ test points. Class DG amplifier IC, designed to drive an 8I speaker Jumper Selection in portable audio applications. The EV kit comes with Shutdown Mode (SHDN) a MAX98307 IC in a 16-pin TQFN package with an exposed pad. The EV kit operates from a DC power sup- Jumper JU1 controls the shutdown pin (SHDN) of the IC. The shutdown pin can also be controlled by an external ply that provides 2.6V to 5.25V and 2A of current. The EV kit accepts differential or single-ended audio input and logic controller connected to the EV kit SHDN PCB pad. Remove the shunt from JU1 before connecting an external provides a fully differential output. The audio input source is amplified to drive up to 3.3W into an 8I speaker. The controller to the SHDN pad. See Table 1 for shunt positions. device outputs, available at the OUT+, OUT- test points Input Mode (IN-) or FOUT+, FOUT- binding posts, can be connected Jumper JU2 provides an option to select between a directly to a speaker load without any filtering and up differential or single-ended input mode for the EV kit. See to 30cm of cable. However, filter components can be Table 2 for jumper JU2 configuration. added to ease evaluation. See the Filtered Output sec- tion for additional information. Maxim Integrated Products 2