19-1222; Rev 0; 11/07 MAX9768 Evaluation Kit/Evaluation System Features The MAX9768 evaluation kit (EV kit) is a fully assembled and tested printed-circuit board (PCB) that demonstrates the capabilities of the MAX9768 mono 10W Class D speaker amplifier with volume control. The MAX9768 EV kit also includes Windows(R) 98SE/2000/XPcompatible software that provides a simple graphical user interface (GUI) for exercising the features of the MAX9768. The MAX9768 evaluation system (EV system) consists of the MAX9768 EV kit and a companion CMAXQUSB serialinterface board. The CMAXQUSB interface board allows a PC to control an I2C interface using its USB port. Order the MAX9768 EV system (MAX9768EVCMAXQU+) for a complete PC-based evaluation of the MAX9768. Order the MAX9768 EV kit (MAX9768EVKIT+) if you already have a MAX9768-compatible serial interface. Fully Tested PCB Load at 13V Power Supply 10W Output into 8 Bridge-Tied Load (BTL) Output and Click-and-Pop Suppression Dual ModeTM Volume Control: Analog or I2C Dual Modulation Schemes: Fixed Frequency and Spread Spectrum Shut-Down Mode and Speaker Mute Mode On-Board LDO for Low-Voltage Analog Power Supply Windows 98SE/2000/XP-Compatible Evaluation Software EV System Includes USB Connectivity Ordering Information Windows is a registered trademark of Microsoft Corp. Dual Mode is a trademark of Maxim Integrated Products, Inc. Component Lists MAX9768 EV System PART QTY DESCRIPTION MAX9768EVKIT+ 1 MAX9768 EV kit CMAXQUSB+ 1 Serial-interface board MAX9768 EV Kit DESIGNATION QTY PART MAX9768EVKIT+ EV Kit MAX9768EVCMAXQU+ EV System +Denotes lead-free and RoHS-compliant. Note: The MAX9768 EV kit software is designed for use with the complete EV system. The EV system includes both the Maxim CMAXQUSB interface board and the EV kit. If the Windows software will not be used, the EV kit board can be purchased without the Maxim CMAXQUSB board. DESCRIPTION MAX9768 EV Kit (continued) MINIMAL COMPONENTS FOR CUSTOMER DESIGN C1, C2 C3, C5 C4 C6, C8 2 2 1 2 C7, C21 2 R2, R3 2 U1 1 0.1F 10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C104K 1F 10%, 10V X7R ceramic capacitors (0603) Murata GRM188R61A105K 0.47F 10%, 16V X7R ceramic capacitor (0805) Murata GRM21BR71C474K 1F 10%, 16V X7R ceramic capacitors (0805) Murata GRM21BR71C105K 22F 20%, 16V aluminum electrolytic capacitor (C case) Panasonic EEEFC1C220R 20k 1% resistors (0603) Maxim 10W mono speaker amplifier with volume control MAX9768ETG+ (24-pin, 4mm x 4mm x 0.8mm, TQFN-EP*) TYPE DESIGNATION QTY DESCRIPTION OPTIONAL COMPONENTS FOR CUSTOMER EVALUATION C9, C10 0 Not installed, ceramic capacitors (0603) C11, C12 2 0.01F 10%, 50V X7R ceramic capacitors (0805) Murata GRM216R71H103K C13, C15 2 0.22F 10%, 25V X7R ceramic capacitors (1206) Panasonic ECJ-3VB1E224K C14, C16, C20 3 0.01F 10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C103K C17 1 1F 10%, 16V X7R ceramic capacitor (0805) Murata GRM21BR71C105K C18 1 1F 10%, 10V X7R ceramic capacitor (0603) Murata GRM188R61A105K *EP = Exposed paddle. ________________________________________________________________ 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 Evaluate: MAX9768 General Description Evaluate: MAX9768 MAX9768 Evaluation Kit/Evaluation System Component Lists (continued) MAX9768 EV Kit (continued) DESIGNATION QTY DESIGNATION QTY DESCRIPTION C19 1 100pF 5%, 50V C0G ceramic capacitor (0603) Murata GRM1885C1H101J J1 1 2 x 10 right-angle female receptacle J2 1 U2 1 Maxim 12V low-dropout linear regulator MAX1726EUK33+ (5-pin SOT23) -- 8 Shunts White RCA mono jack -- 4 0.250in x 0.500in 4-40 round nylon spacers J3-J6 4 Binding posts, uninsulated -- 4 4-40 x 0.375in nylon machine screws JU1-JU5 5 Single-row 3-pin headers -- 1 PCB: MAX9768 Evaluation Kit+ JU6 1 3-way-pin header JU7, JU8 2 2-pin headers L1, L2 2 60, 3A ferrite beads (0805) Murata BLM21PG600SN1 L3, L4 2 Shorted with 0 resistors (0603) INSTALL.EXE L5, L6 2 22H, 1.9A inductors TDK SLF10145T-220M1R9PF Installs the EV kit files on your computer MAX9768.EXE Application program R1, R5 2 10k 5% resistors (0603) FTD2XX.INF USB device driver file R4 1 20 5% resistor (1206) UNINST.INI R6 1 10k 20% thumbwheel potentiometer Panasonic EVL-HFAA05B14 Uninstalls the EV kit software MAX9768 EV Kit Files FILE DESCRIPTION USB driver installation help file TROUBLESHOOTING_USB.PDF Quick Start Recommended Equipment Before proceeding, the following equipment is needed: * 4.5V to 14V DC, 3A power supply * Audio source (i.e., CD player, 1VRMS maximum output) * 8 speaker * MAX9768 EV system MAX9768 EV kit Maxim CMAXQUSB interface board (USB cable included) * DESCRIPTION A user-supplied Windows 98SE/2000/XP PC with a spare USB port Note: In the following sections, software-related items are identified by bolding. Text in bold refers to items directly from the EV kit software. Text in bold and underlined refers to items from the Windows 98SE/ 2000/XP operating system. Procedure for Stand-Alone Operation The MAX9768 EV kit is fully assembled and tested. Follow the steps below to verify board operation for analog volume control. Do not turn on the power supply until all connections are completed. 1) On the MAX9768 EV kit, make sure the shunts are in the default positions (see Table 1). 2) Connect the positive terminal of the 4.5V to 14V DC power supply to the PVDD binding post, and the powersupply ground terminal to the PGND binding post. 3) Connect the 8 speaker across the FOUT+ and FOUT- binding posts. Component Suppliers SUPPLIER PHONE WEBSITE Murata Mfg. Co., Ltd. 770-436-1300 www.murata.com Panasonic Corp. 800-344-2112 www.panasonic.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX9768 when contacting these component suppliers. 2 _______________________________________________________________________________________ MAX9768 Evaluation Kit/Evaluation System 5) Turn on the audio source. Table 1. MAX9768 EV Kit Jumper Settings JUMPER SHUNT POSITION 6) Turn on the 4.5V to 14V DC power supply. 7) Adjust the potentiometer R6 to change the speaker volume. JU1 Procedure for I2C Interface Volume Control JU2 The MAX9768 EV kit is fully assembled and tested. Follow the steps below to verify board operation for I2C volume control. Caution: Do not turn on the power supply until all connections are completed. 1) Visit www.maxim-ic.com/evkitsoftware to download the latest version of the EV kit software, 9768Rxx.ZIP. 2) Install the MAX9768 evaluation software on your computer by running the INSTALL.EXE program. The program files are copied and icons are created in the Windows Start menu. JU3, JU4 JU5 JU6 Normal operation 1-2 Speaker mute 1-2* Normal operation 2-3 Amplifier shutdown 2-3* I2C Address: disabled, standalone operation 1-2 I2C Address: 1001 011x 1-2, 2-3 I2C Address: 1001 001x 2-3, 1-2 I2C Address: 1001 010x 2-3* Stand-alone operation 1-2 I2C volume control mode 1-4* SYNC connected to GND 1-2 SYNC connected to VDD 1-3 SYNC unconnected 3) On the CMAXQUSB board, ensure that the shunt of JU1 is in the 3.3V position. Open 4) Carefully connect the boards by aligning the MAX9768 EV kit's 20-pin connector with the 20-pin connector of the CMAXQUSB board. 1-2* JU7 Open 5) Ensure shunts on JU1, JU2, JU4, JU6, and JU7 are in their default positions (see Table 1). 6) Place the shunt on JU3 across pins 1-2. 7) Place the shunt on JU5 across pins 1-2. JU8 10) Connect the 8 speaker across the FOUT+ and FOUT- binding posts. 11) Plug the audio source to the RCA jack. 12) Turn on the audio source. 13) Turn on the 4.5V to 14V DC power supply. 14) Connect the USB cable from the PC to the CMAXQUSB board. A Building Driver Database window pops up in addition to a New Hardware Found message. If you do not see a window that is similar to the one described above after 30s, remove the USB cable from the CMAXQUSB and reconnect it. Administrator privileges are required to install the USB device driver on Windows 2000/XP. Refer to SYNC connected to external clock VDD supplied by on-board LDO regulator VDD supplied by an external power supply 1-2* In stand-alone operation: classic PWM modulation Open In stand-alone operation: filterless modulation Open I2C interface control mode 8) Remove the shunt on JU8. 9) Connect the positive terminal of the 4.5V to 14V DC power supply to the PVDD binding post, and the power-supply ground terminal to the PGND binding post. DESCRIPTION 2-3* *Default position. the TROUBLESHOOTING_USB.PDF document included with the software if you have any problems during this step. 15) Follow the directions of the Add New Hardware Wizard to install the USB device driver. Choose the Search for the Best Driver for your Device option. Specify the location of the device driver to be C:\Program Files\MAX9768 (or the directory chosen during installation) using the Browse button. 16) Start the MAX9768 EV kit software by opening its icon in the Start menu. The GUI main window appears, as shown in Figure 1. 17) Move the volume-control slider on the software window and verify that the speaker volume changes. _______________________________________________________________________________________ 3 Evaluate: MAX9768 4) Plug the audio source to the RCA jack. Evaluate: MAX9768 MAX9768 Evaluation Kit/Evaluation System Detailed Description of Hardware The MAX9768 is a mono, switch-mode (Class D) audio power amplifier. The EV kit is designed to be driven by the lineout or headphone jack of a CD player, or directly connected to any audio source. A thumbwheel potentiometer mounted on-board is provided to control the volume. The volume can also be controlled by the I2C interface. The EV kit has an on-board LDO (MAX1726) to power the input buffers and the volume-control circuitry. Volume Control Jumpers JU3, JU4, JU5, and JU8 select which volumecontrol mode is used. See Table 3 for details. Table 3. Control-Mode Setting JUMPER SHUNT POSITION DESCRIPTION 2-3* I2C Address: disabled, standalone operation 1-2 I2C Address: 1001 011x 1-2, 2-3 I2C Address: 1001 001x 2-3, 1-2 I2C Address: 1001 010x JU3, JU4 Preamplifier Gain Configuration The preamplifier gain stage of the MAX9768 EV kit is configured to 0dB. To avoid clipping at the amplifier input stage, ensure input signals are 1VRMS. If input signals are 1VRMS, attenuate the input signal at the preamplifier gain stage to avoid clipping at the preamplifier output. The preamplifier gain stage is defined as: JU5 JU8 AV (preamplifier) = -R3 / R2 where R2 is in the 10k to 40k range. Define the preamplifier gain such that the output of the preamplifier is 1VRMS (i.e., VIN x AV (preamplifier) 1VRMS). Once the preamplifier gain is fixed, use the amplifier's volume-control block to set the clipping levels at the output of the Class D amplifier. Power Supplies The power supply is applied on PVDD and PGND binding posts. VDD is generated either by the on-board MAX1726 or by an external 3.3V power supply applied between the VDD pad and PGND. See Table 2 for JU7 setting. 2-3* Stand-alone operation 1-2 I2C volume control mode 1-2* In stand-alone operation: classic PWM modulation Open In stand-alone operation: filterless modulation Open I2C interface control mode *Default position. Shutdown Mode Jumper JU2 sets the amplifier in normal operation or shutdown mode. See Table 4 for details. Table 4. JU2 Setting JUMPER SHUNT POSITION JU2 DESCRIPTION 1-2* Normal operation 2-3 Shutdown mode *Default position. Table 2. JU7 Jumper Setting JUMPER SHUNT POSITION DESCRIPTION 1-2* On-board VDD generated by MAX1726 JU7 Open *Default position. User-provided 3.3V VDD power supply Mute Control Jumper JU1 controls the MUTE pin state. See Table 5 for details. Table 5. JU1 Setting JUMPER SHUNT POSITION JU1 DESCRIPTION 2-3* Normal operation 1-2 Speaker muted *Default position. 4 _______________________________________________________________________________________ MAX9768 Evaluation Kit/Evaluation System Table 6. JU6 Setting JUMPER SHUNT POSITION DESCRIPTION 1-4* Fixed-frequency mode with fSW = 300kHz 1-2 Spread-spectrum mode with fS = 300kHz 7.5kHz 1-3 Fixed-frequency mode with fS = 360kHz Open Fixed-frequency mode with fS = 1/4 external clock frequency JU6 Detailed Description of Software To start the MAX9768 EV kit software, double-click the MAX9768 EV kit icon created during installation. The GUI main window appears, as shown in Figure 1. Wait approximately 2s while the MAX9768 EV kit software connects to the CMAXQUSB board and automatically detects the I2C address of the device. On the left side of the window, the scrollbar is used to increment/decrement the speaker volume by one step. On the right side of the window, a user can manually change the device I2C address, set volume directly by programming the volume register, and set the modulation mode. *Default position. Figure 1. MAX9768 Evaluation Software Main Window _______________________________________________________________________________________ 5 Evaluate: MAX9768 Modulation Schemes Jumper JU6 sets the output modulation scheme. See Table 6 for details. 6 SYNCOUT 2 4 6 8 10 12 14 16 18 20 J1 1 2 3 1 3 5 7 9 11 13 15 17 19 3 JU6 J2 1 3 2 1 C19 100pF SYNC SGND IN R6 10k 20% 1 2 R5 10k VDD VDD 4 2 SCLK SDA VDD C16 0.01F JU5 SDA SDA/VOL C4 0.47F PGND 7 J3 9 11 10 12 R3 20k 1% 8 J4 C3 1F PVDD R2 20k 1% SCLK SCLK L2 GND GND BIAS SYNC IN FB 5 PVDD 3 C14 0.01F PVDD C5 1F C17 1F 5 1 C21 22F BOOT+ 4 1 ADDR2 ADDR1 SHDN MUTE OUT+ OUT+ 2 JU8 C1 C8 0.1F 1F VDD 23 24 19 20 U2 3 OUT 2 GND 4 GND C2 0.1F MAX1726EUK33 SHDN IN C6 1F C18 1F 22 PGND 21 PGND BOOT- OUT- OUT15 18 17 PVDD MAX9768 U1 C7 22F SYNCOUT VDD PVDD 13 14 VDD 16 SDA/VOL SCLK 6 PVDD R1 10k JU7 L3 3 1 2 JU1 VDD L4 3 1 2 C20 0.01F VDD L1 JU3 OUT- 3 1 2 VDD C10 OPEN JU2 VDD C9 OPEN OUT+ 3 1 2 L6 22H VDD R4 20 C13 0.22F JU4 VDD L5 22H FOUTJ6 C12 0.01F C15 0.22F C11 0.01F FOUT+ J5 Evaluate: MAX9768 MAX9768 Evaluation Kit/Evaluation System Figure 2. MAX9768 EV Kit Schematic _______________________________________________________________________________________ MAX9768 Evaluation Kit/Evaluation System Evaluate: MAX9768 Figure 3. MAX9768 EV Kit Component Placement Guide--Component Side _______________________________________________________________________________________ 7 Evaluate: MAX9768 MAX9768 Evaluation Kit/Evaluation System Figure 4. MAX9768 EV Kit PCB Layout--Component Side 8 _______________________________________________________________________________________ MAX9768 Evaluation Kit/Evaluation System Evaluate: MAX9768 Figure 5. MAX9768 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 (c) 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX9768EVKIT+ MAX9768EVCMAXQU+