Evaluates: MAX9788 19-0714 Rev 2 8/07 MAX9788 Evaluation Kit General Description Features The MAX9788 evaluation kit (EV kit) is a fully assembled 5V Single-Supply Operation and tested PCB that uses the MAX9788 Class G ampli- Fully Differential Output fier to drive a bridge-tied-load (BTL) ceramic speaker in portable audio applications. Designed to operate from Delivers Greater than 14V into a Ceramic P-P a 2.7V to 5.5VDC power supply, the EV kit accepts a Speaker single-ended or differential input signal and provides a Evaluates the MAX9788 in a 20-Bump UCSP fully differential output capable of delivering greater than 14V into a ceramic speaker. (2mm x 2.5mm) Package P-P The MAX9788 IC Also Available in 28-Pin Component List (4mm x 4mm) TQFN Package Fully Assembled and Tested DESIGNATION QTY DESCRIPTION 0.1F 10%, 6.3V X5R ceramic C1, C2, C3 3 capacitors (0402) Murata GRM155R60J104K 1F 10%, 6.3V X5R ceramic Ordering Information C5, C6 2 capacitors (0402) Murata GRM155R60J105K PART TEMP RANGE IC PACKAGE 4.7F 10%, 6.3V X5R ceramic 20 UCSP-20 MAX9788EVKIT+ 0C to +70C* C7 1 capacitor (0603) (2mm x 2.5mm) Murata GRM188R60J475K +Denotes a lead-free and RoHS-compliant EV kit. 10F 20%, 6.3V X5R ceramic *This limited temperature range applies to the EV kit PCB only. C8, C9, C10 3 capacitors (0603) The MAX9788 IC temperature range is -40C to +85C. Murata GRM188R60J106M C11, C12 0 Not installed, capacitors (0603) JU1 1 3-pin header 3.5mm stereo phone jack OUT 1 (3-position, non-switch) Component Suppliers 10k 0.5% precision thick-film chip R1R4 4 resistors (0603) SUPPLIER PHONE WEBSITE Panasonic ERJ3RBD1002V Murata Mfg. Co., Ltd. 770-436-1300 www.murata.com R5 1 100k 1% resistor (0603) Panasonic Corp. 714-373-7366 www.panasonic.com R6, R7 2 5.1 5% resistors (0805) Note: Indicate that you are using the MAX9788 when contact- MAX9788EBP+ (20-bump, 4 x 5 ing these component suppliers. U1 1 UCSP, 2mm x 2.5mm) 1 Shunt 1 PCB: MAX9788EVKIT+ 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.MAX9788 Evaluation Kit The EV kit accepts single-ended or a differential audio Quick Start input and provides a fully differential output. The audio Recommended Equipment input source is amplified to drive greater than 14V P-P 5V, 1A power supply into a ceramic speaker. Audio source (i.e., CD player, MP3 player) Customizing the Gain One ceramic speaker (recommended suppliers: The MAX9788 EV kit is shipped with a gain of +12dB. Murata, Taiyo Yuden) Change the resistors (R1R4) to customize the gain of the EV kit (refer to the MAX9788 IC data sheet for Procedure details). The MAX9788 EV kit is fully assembled and tested. Follow the steps below to verify board operation. Jumper Selection Caution: Do not turn on the power supply until all con- Shutdown Mode (SHDN) nections are completed. Jumper JU1 controls the shutdown pin (SHDN) of the 1) Install a shunt across pins 1-2 of jumper JU1 (EV kit MAX9788 IC. The shutdown pin is also controlled by ON). an external logic controller connected to the EV kit SHDN pad. Remove the shunt from jumper JU1 before 2) Connect the ceramic speaker across the OUT- and connecting an external controller to the SHDN pad. OUT+ pads. See Table 1 for shunt positions. 3) Connect the positive terminal of the power supply to the VCC pad and the ground terminal to the GND pad. Table 1. Shutdown Mode, JU1 Jumper 4) Connect the positive terminal of the audio source to Selection the IN+ pad. MAX9788 SHDN 5) Connect the negative terminal of the audio source SHUNT PIN CONNECTED EV KIT FUNCTION to the IN- pad. Connect the IN- pad to GND if the POSITION TO audio source is single ended. 1-2* VDD EV kit enabled 6) Connect the ground terminal of the audio source to the GND pad. 2-3 GND Shutdown mode 7) Turn on the audio source. SHDN driven by external External logic logic controller. 8) Turn on the power supply. None Shutdown is active low controller Detailed Description and 1.8V logic compliant. The MAX9788 EV kit features the MAX9788 Class G *Default position. 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 Evaluates: MAX9788