19-0714; Rev 2; 8/07 MAX9788 Evaluation Kit The MAX9788 evaluation kit (EV kit) is a fully assembled and tested PCB that uses the MAX9788 Class G amplifier to drive a bridge-tied-load (BTL) ceramic speaker in portable audio applications. Designed to operate from a 2.7V to 5.5VDC power supply, the EV kit accepts a single-ended or differential input signal and provides a fully differential output capable of delivering greater than 14VP-P into a ceramic speaker. Component List DESIGNATION QTY C1, C2, C3 3 0.1F 10%, 6.3V X5R ceramic capacitors (0402) Murata GRM155R60J104K C5, C6 2 1F 10%, 6.3V X5R ceramic capacitors (0402) Murata GRM155R60J105K 1 4.7F 10%, 6.3V X5R ceramic capacitor (0603) Murata GRM188R60J475K C8, C9, C10 3 10F 20%, 6.3V X5R ceramic capacitors (0603) Murata GRM188R60J106M C11, C12 0 Not installed, capacitors (0603) JU1 1 3-pin header OUT 1 3.5mm stereo phone jack (3-position, non-switch) R1-R4 4 10k 0.5% precision thick-film chip resistors (0603) Panasonic ERJ3RBD1002V C7 DESCRIPTION R5 1 100k 1% resistor (0603) R6, R7 2 5.1 5% resistors (0805) U1 1 MAX9788EBP+ (20-bump, 4 x 5 UCSP, 2mm x 2.5mm) -- 1 Shunt -- 1 PCB: MAX9788EVKIT+ Features 5V Single-Supply Operation Fully Differential Output Delivers Greater than 14VP-P into a Ceramic Speaker Evaluates the MAX9788 in a 20-Bump UCSP (2mm x 2.5mm) Package The MAX9788 IC Also Available in 28-Pin (4mm x 4mm) TQFN Package Fully Assembled and Tested Ordering Information PART TEMP RANGE MAX9788EVKIT+ 0C to +70C* IC PACKAGE 20 UCSP-20 (2mm x 2.5mm) +Denotes a lead-free and RoHS-compliant EV kit. *This limited temperature range applies to the EV kit PCB only. The MAX9788 IC temperature range is -40C to +85C. Component Suppliers SUPPLIER PHONE Murata Mfg. Co., Ltd. 770-436-1300 www.murata.com WEBSITE Panasonic Corp. 714-373-7366 www.panasonic.com Note: Indicate that you are using the MAX9788 when contacting these component suppliers. ________________________________________________________________ Maxim Integrated Products 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. 1 Evaluates: MAX9788 General Description Evaluates: MAX9788 MAX9788 Evaluation Kit Quick Start Recommended Equipment * 5V, 1A power supply * Audio source (i.e., CD player, MP3 player) * One ceramic speaker (recommended suppliers: Murata, Taiyo Yuden) Procedure The MAX9788 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) Install a shunt across pins 1-2 of jumper JU1 (EV kit ON). 2) Connect the ceramic speaker across the OUT- and OUT+ pads. 3) Connect the positive terminal of the power supply to the VCC pad and the ground terminal to the GND pad. 4) Connect the positive terminal of the audio source to the IN+ pad. The EV kit accepts single-ended or a differential audio input and provides a fully differential output. The audio input source is amplified to drive greater than 14VP-P into a ceramic speaker. Customizing the Gain The MAX9788 EV kit is shipped with a gain of +12dB. Change the resistors (R1-R4) to customize the gain of the EV kit (refer to the MAX9788 IC data sheet for details). Jumper Selection Shutdown Mode (SHDN) Jumper JU1 controls the shutdown pin (SHDN) of the MAX9788 IC. The shutdown pin is also controlled by an external logic controller connected to the EV kit SHDN pad. Remove the shunt from jumper JU1 before connecting an external controller to the SHDN pad. See Table 1 for shunt positions. Table 1. Shutdown Mode, JU1 Jumper Selection MAX9788 SHDN PIN CONNECTED TO 5) Connect the negative terminal of the audio source to the IN- pad. Connect the IN- pad to GND if the audio source is single ended. SHUNT POSITION 6) Connect the ground terminal of the audio source to the GND pad. 1-2* VDD EV kit enabled 2-3 GND Shutdown mode None External logic controller 7) Turn on the audio source. 8) Turn on the power supply. Detailed Description The MAX9788 EV kit features the MAX9788 Class G amplifier IC, designed to drive a ceramic speaker in a BTL configuration. The EV kit operates from a DC power supply that provides 2.7V to 5.5V and 1A of current. 2 EV KIT FUNCTION SHDN driven by external logic controller. Shutdown is active low and 1.8V logic compliant. *Default position. _______________________________________________________________________________________ MAX9788 Evaluation Kit VCC D1 C8 10F GND C2 0.1F C1 0.1F D5 D3 VCC CPVDD VCC GND CPGND U1 PVSS VCC 1 2 SHDN MAX9788 B2 JU1 R2 10k 0.5% 3 B4 SHDN SVSS SVSS C1P IN+ R1 10k 0.5% C11 OPEN IN- B5 A5 C6 1F R3 10k 0.5% A4 R4 10k 0.5% A3 C9 10F A1 C1 C10 10F C2 C3 0.1F C4 A2 C7 4.7F FB+ C1N C5 1F Evaluates: MAX9788 VCC VCC OUT+ B1 R6 5.1 D2 OUT 3 1 IN+ OUT- D4 2 R7 5.1 INFB- OUT+ FS OUT- C5 R5 100k 1% C12 OPEN Figure 1. MAX9788 EV Kit Schematic _______________________________________________________________________________________ 3 Evaluates: MAX9788 MAX9788 Evaluation Kit Figure 2. MAX9788 EV Kit Component Placement Guide-- Component Side Figure 3. MAX9788 EV Kit PCB Layout--Component Side Figure 4. MAX9788 EV Kit PCB Layout--Solder Side Revision History Pages changed at Rev 2: 1, 3, 4 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 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2007 Maxim Integrated Products CARDENAS is a registered trademark of Maxim Integrated Products, Inc. Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX9788EVKIT+