MAX97000EVKIT+

19-5053; Rev 0; 11/09 MAX97000 Evaluation Kit Features The MAX97000 evaluation kit (EV kit) is a fully assembled and tested PCB that evaluates the MAX97000 mono Class D audio power amplifier and stereo Class H DirectDriveM headphone amplifier communicating over a 2-wire I2C interface. The EV kit features an on-board microcontroller for communicating with the I2C interface of the MAX97000. Pads are provided for accessing the analog inputs and amplifier outputs. S 2.7V to 5.5V Single-Supply Operation The MAX97000 EV kit requires a 2.7V to 5.5V power supply. The on-chip LDO generates an internal 1.8V supply from the 2.7V to 5.5V supply. S Windows 2000-, Windows XP-, and Windows Vista WindowsM 2000-, Windows XPM-, and Windows VistaMcompatible software is provided to facilitate configuration. The software controls an on-board microcontroller over USB, which generates I2C commands. S Proven Audio PCB Layout S On-Board USB Interface Circuit Generates I2C- Compatible Signals S PCB Pads for User-Supplied I2C-Compatible Signals S Surface-Mount Components (32-Bit)-Compatible Software S Fully Assembled and Tested Ordering Information PART TYPE MAX97000EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION C1, C3–C10, C17 10 0.1FF Q10%, 16V X7R ceramic capacitors (0603) Murata GRM188R71C104K C2 1 DESIGNATION QTY DESCRIPTION C20 1 3300pF Q10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H332K 4.7FF Q10%, 6.3V X5R ceramic capacitor (0603) Murata GRM188R60J475K C26–C29, C39–C42 0 Not installed, ceramic capacitors (0402) 2 2 10pF Q5%, 50V C0G ceramic capacitors (0603) Murata GRM1885C1H100J C31, C33 0.1FF Q10%, 16V X7R ceramic capacitors (0402) Murata GRM155R71C104K C13, C15, C32, C34 C43–C47 5 4 10FF Q10%, 6.3V X5R ceramic capacitors (0603) Murata GRM188R60J106M 0.22FF Q10%, 10V X5R ceramic capacitors (0402) Murata GRM155R61A224K D1 1 Green LED (0603) C14, C16, C22–C25, C30, C35–C38 1FF Q10%, 10V X5R ceramic capacitors (0402) Murata GRM155R61A105K GND 1 Black miniature test point 11 HPJK 1 3.5mm stereo phone jack, SMT, 3-position, nonswitch HPL 1 White miniature test point 2 22pF Q5%, 50V C0G ceramic capacitors (0603) Murata GRM1885C1H220J HPR 1 Red miniature test point JINA1, JINB1 2 White RCA jacks (left) C11, C12 C18, C19 DirectDrive is a registered trademark of Maxim Integrated Products, Inc. Windows, Windows XP, and Windows Vista are registered trademarks of Microsoft Corp. ________________________________________________________________ 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: MAX97000 General Description Evaluates: MAX97000 MAX97000 Evaluation Kit Component List (continued) DESIGNATION QTY JINA2, JINB2 2 Red RCA jacks (right) JU1, JU2, JU3 3 2-pin headers JU4 1 L1, L2 0 DESCRIPTION DESIGNATION QTY U2 1 32-bit microcontroller (68 QFN-EP*) Maxim MAXQ2000-RAX+ 3-pin header U3 1 93C46 type 3-wire EEPROM (8 SO) Not installed, inductors (provided with EV kit) TOKO A916CY-220M U4 1 UART-to-USB converter (32 TQFP) U5 1 3.3V regulator (5 SC70) Maxim MAX8511EXK33+ (Top Mark: AEI) U6 1 3.3V regulator (5 SC70) Maxim MAX8511EXK25+ (Top Mark: ADV) Y1 1 16MHz crystal (HCM49) Hong Kong X’tals SSM16000N1HK188F0-0 Y2 1 6MHz crystal (HCM49) Hong Kong X’tals SSL60000N1HK188F0-0 — 1 USB high-speed A-to-mini B cable, 2m OUT-, OUT+ 2 Test points P1 1 USB mini type-B receptacle connector R1, R10–R15, R18, R19 9 0I Q5% resistors (0402) R2 1 220I Q5% resistor (0603) R3 1 10kI Q5% resistor (0603) R4 1 2.2kI Q5% resistor (0603) R5, R8, R9 3 1.5kI Q5% resistors (0603) DESCRIPTION R6, R7 2 27I Q5% resistors (0603) R16, R17 0 Not installed, resistors (0603) R20, R21 2 0I Q5% resistors (0603) R22, R23 2 22I Q5% resistors (0402) — 4 Shunts 0 Not installed, multipurpose test points — 1 PCB: MAX97000 EVALUATION KIT+ 1 Mono Class D speaker and Class H headphone amplifier (25 WLP) Maxim MAX97000EWA+ TP1, TP2 U1 *EP = Exposed pad. Component Suppliers SUPPLIER PHONE WEBSITE Hong Kong X’tals Ltd. 852-35112388 www.hongkongcrystal.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com TOKO America, Inc. 847-297-0070 www.tokoam.com Note: Indicate that you are using the MAX97000 when contacting these component suppliers MAX97000 EV Kit Files FILE INSTALL.EXE DESCRIPTION Installs the EV kit files on your computer MAX97000_1_2.EXE Application program FTD2XX.INF USB device driver file UNINST.INI Uninstalls the EV kit software USB_Driver_Help.PDF USB driver installation help file 2   _______________________________________________________________________________________ MAX97000 Evaluation Kit Required Equipment • 5V, 1A DC power supply (PVDD) • Speaker • Headphones • User-supplied Windows 2000, Windows XP, or Windows Vista PC with a spare USB port • MAX97000 EV kit (cable included) 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 operating system. Procedure The MAX97000 EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not apply power to VDD. 1) Visit www.maxim-ic.com/evkitsoftware to download the latest version of the EV kit software, MAX97000_1_2xx.ZIP. Save the EV kit software to a temporary folder and uncompress the ZIP file. 2) Install the EV kit software on the computer by running the INSTALL.EXE program inside the temporary folder. 6) Connect the USB cable from the PC to the EV kit board. A New Hardware Found window pops up when installing the USB driver for the first time. If a window is not seen that is similar to the one described above after 30s, remove the USB cable from the board and reconnect it. Administrator privileges are required to install the USB device driver on Windows. 7) Follow the directions of the Found New Hardware window to install the USB device driver. Manually specify the location of the device driver to be C:\ Program Files\MAX97000_1_2 (default installation directory) using the Browse button. During device driver installation, Windows may show a warning message indicating that the device driver Maxim uses does not contain a digital signature. This is not an error condition and it is safe to proceed with installation. Refer to the USB_Driver_Help.PDF document included with the software for additional information. 8) Connect the 5V power supply across the PVDD and GND pads. 9) Connect the speaker across the OUT+ and OUTtest points. 10) Connect the headphones to HPJK. 3) Verify that shunts are installed on jumpers JU1 and JU2. This configures the I2C inputs to receive signals from the USB interface circuitry. 11) Enable the power supply. 4) Verify that a shunt is installed on jumper JU3. 13) Observe as the program automatically detects the address of the MAX97000 and starts the main program. 5) Verify that a shunt is installed in the 2-3 position on jumper JU4. This is the hardware enable. The MAX97000 has a software enable that is also required to turn on the MAX97000. 12) Start the MAX97000 EV kit software by selecting its icon in the Start | Programs menu. 14) The MAX97000 is now ready for evaluation. _______________________________________________________________________________________   3 Evaluates: MAX97000 Quick Start Evaluates: MAX97000 MAX97000 Evaluation Kit Figure 1. MAX97000 Evaluation Kit Software Main Control Tab 4   _______________________________________________________________________________________ MAX97000 Evaluation Kit Graphical User Interface (GUI) If the USB cable is connected to the EV kit, but power is not applied to PVDD, the EV kit GUI acts like it is in demo mode. In such a case, the EV kit is connected to the PC through USB, and I2C commands can be sent to the MAX97000. However, without power, the MAX97000 does not acknowledge the I2C commands. When power is applied, press the Reset button to detect the presence of the MAX97000. The MAX97000 EV kit software Main Control tab (Figure 1) divides the EV kit functions into logical blocks. The MAX97000 EV kit software Registers tab (Figure 2) displays each register’s individual bit logic-level status. A data bit in bold indicates a logic-high, while a data bit that is not bold indicates a logic-low. Clicking on the individual data bit toggles the bit and performs a write command. The new command is shown in the edit box at the right. Write commands can be written to the registers alternatively by typing a hex value in the edit box and pressing the Enter key on the keyboard. The Write All button writes the current settings to all of the registers on the GUI. The EV kit software GUI performs I2C write commands as changes occur on the GUI. The Read All button changes the GUI settings to match the MAX97000 register settings. To change settings one time, enter demo mode by selecting the Options | Demo Mode menu item, change the GUI to the required settings, exit demo mode by selecting Options | Demo Mode, and then press the Write All button. If further changes are not required, enter demo mode to disable communication to the MAX97000. To obtain the MAX97000 settings, exit demo mode and press the Read All button. The Reset button clears the EV kit software GUI and reprograms the MAX97000 to the default values. Note: Text in bold refers to items in the EV kit software. The MAX97000 EV kit software GUI (Figures 1 and 2) provides a convenient way to test the features of the MAX97000. Figure 1 shows the MAX97000 EV kit software’s Main Control tab, while Figure 2 shows the Registers tab. Actions on the two tabs generate I2C commands to update the MAX97000 internal memory registers. Software Startup Upon starting the program, the MAX97000 EV kit software automatically searches for the USB interface circuit and then for the MAX97000 device address. The MAX97000 EV kit enters the normal operating mode when the USB connection is detected and has found the device address. If jumper JU4 (hardware shutdown) is in the 1-2 position (off), the MAX97000’s I2C bus is not active. The ENABLE checkbox is the software shutdown and requires JU4 to be in the 2-3 position (on). The ENABLE checkbox in the Main Control tab enables the EV kit if the hardware enable is also on. If the USB connection is not detected, the software prompts the user to retry or enter the demo mode. Demo Mode The MAX97000 EV kit software enters the demo mode when the USB connection is not detected or by selecting the Options | Demo Mode menu item in the main window. When in demo mode, all software communication to the EV kit circuit is disabled; however, most of the software GUI is functional. Demo mode allows the user to evaluate the software without hardware connectivity. Write All/Read All/Reset MAX97000 Master Controls The MAX97000 EV kit software’s MAX97000 Master Controls group box contains ENABLE, Volume Slew Disable, and Zero Crossing Detection Disable checkboxes. The ENABLE checkbox, which is also called the software shutdown, enables or disables the MAX97000. The Volume Slew Disable checkbox, when checked, disables the volume slewing. The Zero Crossing Detection Disable checkbox, when checked, disables the zero-crossing detection (ZCD) during a volumechange operation. When enabled (unchecked), the ZCD forces all volume adjustment to be made when the output signal is crossing zero, thus reducing audio clicks during volume changes. Input Gain The MAX97000 EV kit software’s Input Gain group box selects the input channel preamp gain for the MAX97000. The MAX97000 input channel preamp gain is selectable between -6dB, -3dB, 0dB, +3dB, +6dB, +9dB, and +18dB. _______________________________________________________________________________________   5 Evaluates: MAX97000 Detailed Description of Software Evaluates: MAX97000 MAX97000 Evaluation Kit Figure 2. MAX97000 Evaluation Kit Software Registers Tab 6   _______________________________________________________________________________________ MAX97000 Evaluation Kit Distortion Limiter The distortion limiter limits distortion based on the defined THD level and has programmable release time. Switch Enable The MAX97000 features an internal switch that can be enabled by checking the Switch Closed checkbox in the Analog Switch group box. The internal switch is closed by default. The software shutdown has no effect on the internal switch. Under a hardware shutdown, the switch is open. Low-Power Mode The MAX97000’s low-power mode minimizes current consumption when only using the headphone amplifier. Low-power mode transmits a single-ended audio signal to the headphone amplifier from either INA or INB, or a differential signal from INA and INB. Low-power mode is enabled by selecting LP Mode from the drop-down list. The volume control and mixer are bypassed in this mode. Mixer The speaker, left headphone, and right headphone each have an independent mixer. The MAX97000 EV kit accepts a pair of single-ended audio inputs for stereo operation, or a pair of differential audio inputs for mono operation. The single-ended input signals for the speaker and headphones are defined as IN_1 (left) and IN_2 (right). In the Input Configuration group box, select the Stereo (S/E) for single-ended stereo operation or Mono (DIF) for differential mono operation. Depending on the selection, the speaker and headphone mixers provide options for selecting the audio source for the SPKR Mixer, Left HP Mixer, and Right HP Mixer. Speaker Amplifier The MAX97000 EV kit software’s Speaker Amplifier group box contains the speaker mixer, speaker volume, and speaker enable control. Check the Speaker Enable checkbox to enable the speaker amplifier. The Speaker Volume track bar sets the speaker volume between -30dB (min) to +20dB (max). Alternatively, the user can enter a numerical value inside the Speaker Volume edit box. Headphone Amplifier The Headphone Amplifier group box enables or disables the headphone outputs. The Left Headphone Volume and Right Headphone Volume track bars set the headphone volume. The Left HP Enable and Right HP Enable checkboxes enable the headphone amplifiers. The Left Headphone Volume and Right Headphone Volume track bars set the left and right headphone volume, respectively, to between -64dB (min) to +6dB (max). Alternatively, the user can enter a numerical value inside the Left Headphone Volume and Right Headphone Volume edit boxes. I2C Interface Indicator The MAX97000 EV kit software Interface group box displays the MAX97000’s I2C Device Address, Register Address, and the last Data Sent. The MAX97000 I2C device address is internally set to 0x9A. Simple I2C Commands There are three methods for communicating with the MAX97000 EV kit, through the Main Control tab (Figure 1), the Registers tab (Figure 2), or by using low-level SMBusK commands available in the Advanced User Interface window (Figure 3). Select Options | Interface (Advanced User Interface) to display the Advanced User Interface window that allows I2C operations, such as SMBusReadByte and SMBusWriteByte. SMBus is a trademark of Intel Corp. _______________________________________________________________________________________   7 Evaluates: MAX97000 Charge Pump The MAX97000 features an internal charge pump for Maxim’s Class H DirectDrive architecture. The charge pump operates in two modes, fixed mode and high-efficiency mode. By default, the MAX97000 charge pump operates in high-efficiency mode. High-efficiency mode on the charge pump dynamically changes the internal supply rails. To have fixed internal supply rails, check the Fixed Mode checkbox in the Charge Pump group box. Within fixed mode, there are two options for the supply rails shown in the drop-down list, Q1.8V and Q0.9V. Evaluates: MAX97000 MAX97000 Evaluation Kit Figure 3. Advanced User Interface Window (2-Wire Interface Tab) 8   _______________________________________________________________________________________ MAX97000 Evaluation Kit The MAX97000 EV kit evaluates the MAX97000 Class D audio amplifier and stereo DirectDrive headphone amplifier, which communicates over I2C. The EV kit demonstrates the MAX97000 features such as user-defined input configuration, input gain, input source, output enable, and volume control. The EV kit uses the MAX97000 IC in a 25-bump WLP (2mm x 2mm) package on a proven six-layer PCB design. The MAX97000 EV kit operates from a 2.7V to 5.5V DC power supply. Filtered Output Audio analyzers typically cannot accept pulse-widthmodulated (PWM) signals at their inputs. Therefore, the MAX97000 EV kit includes a pair of lowpass filters at the output to ease evaluation. To use the filtering output pads (FOUT+/FOUT-), install inductors L1 and L2 (provided with the EV kit), connect the load between FOUT+ and FOUT-, and connect the filtered output to the audio analyzer. The lowpass filters at the speaker outputs are optimized for an 8I speaker. Filterless Output The MAX97000 EV kit’s filterless outputs (OUT+/OUT-) can be connected directly to a speaker load without any filtering. Use the OUT+/OUT- test points to connect the speaker directly to the MAX97000 outputs using a twisted-pair cable. Do not install inductors L1 and L2 for maximum efficiency. Table 1. MAX97000 Jumper Table JUMPER JU1 JU2 JU3 JU4 SHUNT POSITION Closed* Open Closed* Open Closed* Open DESCRIPTION On-board I2C. Connects on-board SCL signal to the SCL pad. User-supplied I2C. Open the jumper and apply the SCL signal to the SCL pad. On-board I2C. Connects on-board SDA signal to the SDA pad. User-supplied I2C. Open the jumper and apply the SDA signal to the SDA pad. Connects LDOIN input to PVDD. Do not apply power to the LDOIN pad in this case. Does not connect LDOIN input to PVDD. Externally supply LDOIN. 1-2 Hardware shutdown of the MAX97000. MAX97000 I2C bus is not active. 2-3* Hardware enable of the MAX97000. *Default position. _______________________________________________________________________________________   9 Evaluates: MAX97000 Detailed Description of Hardware Evaluates: MAX97000 MAX97000 Evaluation Kit Figure 4a. MAX97000 EV Kit Schematic (Sheet 1 of 2) 10   ������������������������������������������������������������������������������������� MAX97000 Evaluation Kit Evaluates: MAX97000 Figure 4b. MAX97000 EV Kit Schematic (Sheet 2 of 2) ______________________________________________________________________________________   11 Evaluates: MAX97000 MAX97000 Evaluation Kit 1.0” Figure 5. MAX97000 EV Kit Component Placement Guide—Component Side 1.0” Figure 6. MAX97000 EV Kit PCB Layout—Component Side 12   ������������������������������������������������������������������������������������� MAX97000 Evaluation Kit Evaluates: MAX97000 1.0” Figure 7. MAX97000 EV Kit PCB Layout—GND Layer 2 1.0” Figure 8. MAX97000 EV Kit PCB Layout—GND Layer 3 ______________________________________________________________________________________   13 Evaluates: MAX97000 MAX97000 Evaluation Kit 1.0” Figure 9. MAX97000 EV Kit PCB Layout—PWR Layer 4 1.0” Figure 10. MAX97000 EV Kit PCB Layout—GND Layer 5 14   ������������������������������������������������������������������������������������� MAX97000 Evaluation Kit Evaluates: MAX97000 1.0” Figure 11. MAX97000 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 ©  2009 Maxim Integrated Products 15 Maxim is a registered trademark of Maxim Integrated Products, Inc.