MAX9856EVKIT+

19-4169; Rev 1; 3/10 MAX9856 Evaluation Kit The MAX9856 evaluation kit (EV kit) consists of a MAX9856 evaluation board and software. The MAX9856 EV kit is a fully assembled and tested PCB that evaluates the MAX9856 high-performance, low-power stereo audio CODEC with microphone inputs, DirectDrive® headphone amplifiers, and stereo line outputs. The EV kit is designed to send and receive digital audio data in the Sony/Philips digital interface (S/PDIF) format and can be optionally configured to communicate using generic digital audio or I2S-compatible signals. The EV kit provides RCA jacks for connecting analog input signals, analog output signals, and digital S/PDIF signals. A 3.5mm headphone jack provides easy connection of headphones to the circuit board. Another 3.5mm microphone jack provides easy connection of microphones to the circuit board. The MAX9856 EV kit includes Windows ® 2000-, Windows XP®-, and Windows Vista®-compatible software that provides a simple graphical user interface (GUI) for exercising the features of the MAX9856. The EV kit is connected to a PC through a USB cable. Features o USB Connectivity (No External Power Supply Required) o Electrical S/PDIF Input/Output (with TOSLINK Option) o On-Board 12MHz Crystal Clock Oscillator o On-Board S/PDIF Digital Audio Receiver o On-Board S/PDIF Digital Audio Transmitter o On-Board Power-Management IC o Isolation Header for Direct Communication with the MAX9856 I2C and Digital Audio Interfaces o Easy-to-Use Menu-Driven Software o Fully Assembled and Tested o Windows 2000-, Windows XP-, and Windows Vista-Compatible Evaluation Software Ordering Information PART TYPE MAX9856EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. PC INTERFACE USB System Diagram 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 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Evaluates: MAX9856 General Description Evaluates: MAX9856 MAX9856 Evaluation Kit Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY 10μF ±10%, 10V X5R ceramic capacitors (0805) TDK C2012X5R1A106K C54 1 0.22μF ±10%, X7R 10V ceramic capacitor (0603) TDK C1608X7R1A224K 0.1μF ±10%, 16V X7R ceramic capacitors (0603) TDK C1608X7R1C104K C69 1 1000pF ±5%, 50V C0G ceramic capacitor (0603) TDK C1608C0G1H102J 4.7μF ±20%, 6.3V X5R ceramic capacitors (0603) TDK C1608X5R0J475M C70 1 0.022μF ±5%, 50V C0G ceramic capacitor (1206) TDK C3216C0G1H223J D1 1 Green LED (0603) 1μF ±10%, 10V X7R ceramic capacitors (0603) TDK C1608X7R1A105K D2 1 Red LED (0603) FB1 1 Ferrite bead TDK MMZ1608R301A (0603) or equivalent J1 1 USB type-B right-angle PCB mount receptacle J2 0 Not installed, 10-pin dual-row header (2 x 5) J3 1 Switched stereo headphone jack (3.5mm) J4, J6 2 White phono jacks (side-entry PCB mount) J5, J7 2 Red phono jacks (side-entry PCB mount) J8 1 Stereo headphone jack (3.5mm) J9 0 Not installed, 6-pin single-row header (1 x 6) J10 1 SMA PC-mount connector J11, J12 2 Black phono jacks (side-entry PCB mount) REQUIRED COMPONENTS C27, C31 C28, C32 C29, C30 2 2 2 C33–C36, C38, C39, C40, C43, C44, C45, C74, C78, C81, C85 14 R13 1 10kΩ ±5% resistor (0603) SUPPORT COMPONENTS C1, C12, C14, C42, C75, C79, C83, C86, C88 C2, C3 10μF ±10%, 10V X5R ceramic capacitors (0805) TDK C2012X5R1A106K 2 22pF ±5%, 50V C0G ceramic capacitors (0603) TDK C1608C0G1H220J 1 0.033μF ±10%, 25V X7R ceramic capacitor (0603) TDK C1608X7R1E333K C5–C10, C17, C18, C46, C48, C51, C53, C56, C59, C77 15 0.1μF ±10%, 16V X7R ceramic capacitors (0603) TDK C1608X7R1C104K C11, C47, C50, C52, C55, C57, C58, C66, C67, C73, C87 11 C13, C37, C41, C64, C65, C68, C71, C72, C76, C80, C82, C84, C89 13 1μF ±10%, 10V X7R ceramic capacitors (0603) TDK C1608X7R1A105K J13 0 Not installed, digital audio optical receiver Toshiba TORX147L C15, C16 2 10pF ±5%, 50V C0G ceramic capacitors (0603) TDK C1608C0G1H100J J14 0 Not installed, digital audio optical transmitter Toshiba TOTX147L 1 27-pin, three-row header (3 x 9) 0 Not installed, ceramic capacitor (0603) JU1 C49 JU2 1 3-pin header C4 2 9 DESCRIPTION 0.01μF ±5%, 25V C0G ceramic capacitors (0603) TDK C1608C0G1E103J _______________________________________________________________________________________ MAX9856 Evaluation Kit DESIGNATION QTY JU4–JU10 7 2-pin headers 1 3.3μH ±5%, 270mA inductor (1812) Coilcraft 1812CS-332XJLB L1 L2 1 DESCRIPTION QTY U2 1 Microcontroller (68 QFN-EP*) Maxim MAXQ2000-RAX U3 1 Power management IC (20 TQFN) Maxim MAX1799ETP+ U4 1 LDO regulator (5 SC70) Maxim MAX8511EXK25+ U5 1 USB-to-UART converter FTDI FT232BL U6 1 93C46 type 3-wire EEPROM Atmel AT93C46A-10SU-2.7 U11 1 I2C-to-parallel converter (16 QSOP) Maxim MAX1609EEE+ U13 1 Phase-locked loop U15 1 192kHz digital audio transmitter Cirrus Logic CS8406-CZZ U16 1 192kHz digital audio receiver Cirrus Logic CS8416-CZZ U17 1 CPLD Xilinx XC9536XL-7VGQ44C Y1 1 16MHz crystal Citizen HCM49-16.000MABJ-UT Y2 1 6MHz crystal Citizen HCM49-6.000MABJ-UT Y3 0 Not installed, 32.768kHz crystal Y4 1 3.3V, 12MHz crystal clock oscillator Citizen CSX750FBC12.000000M-UT — 17 Shunts — 1 PCB: MAX9856 EVALUATION KIT+ 47μH ±5% 200mA inductor (1812) Coilcraft 1812LS-473XJLB R1, R2 2 27Ω ±5% resistors (0603) R3, R11, R12 3 1.5kΩ ±5% resistors (0603) R4 1 470Ω ±5% resistor (0603) R5, R16, R17, R22, R44 5 2.2kΩ ±5% resistors (0603) R6, R23, R28–R34 9 10kΩ ±5% resistors (0603) R7, R8 2 220Ω ±5% resistors (0603) R9 1 0Ω ±5% resistor (0603) R10 1 3.01kΩ ±1% resistor (0603) R14, R18, R19, R24 4 75Ω ±5% resistors (0603) R15 1 1kΩ ±5% resistor (0603) R20, R21 0 Not installed, resistors (0603) R25, R26 2 100kΩ ±5% resistors (0603) R27, R37, R38, R40 4 47kΩ ±5% resistors (0603) R35 1 107Ω ±1% resistor (0603) R36 1 243Ω ±1% resistor (0603) R39 1 510Ω ±5% resistor (0603) R41 1 75Ω ±1% resistor (0603) R42 1 2.4kΩ ±5% resistor (0603) T1 1 Digital audio transformer Scientific Conversion, Inc. SC979-03LF TP1 0 Not installed, test point 1 Stereo audio CODEC (40 TQFN-EP*) Maxim MAX9856ETL+ U1 DESIGNATION DESCRIPTION *EP = Exposed pad. Component Suppliers SUPPLIER PHONE WEBSITE Coilcraft, Inc. 847-639-6400 www.coilcraft.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX9856 when contacting these component suppliers. _______________________________________________________________________________________ 3 Evaluates: MAX9856 Component List (continued) Evaluates: MAX9856 MAX9856 Evaluation Kit MAX9856 EV Kit Files FILE DESCRIPTION INSTALL.EXE Installs the EV kit files on your computer MAX9856.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 Quick Start Recommended Equipment • User-supplied Windows 2000, Windows XP, or Windows Vista PC with a spare USB port • One standard USB peripheral cable • One pair of headphones (16< or greater) • One analog audio source • Three RCA interconnect cables Refer to the MAX9856 IC data sheet while using this EV kit for detailed descriptions of the CODEC’s features. 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 MAX9856 EV kit is fully assembled and tested. Follow the steps below to verify board operation in an analog input, digital loopback, and analog output mode. Once the board has been set up, verify that the board is operating properly before beginning an evaluation. 1) Verify that all the jumpers are set in their default positions. See Table 2 for default shunt positions. 7) Install the MAX9856 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. 8) Connect the USB cable from the PC to the MAX9856 EV kit board. 9) A Building Driver Database window pops up in addition to a New Hardware Found message when installing the USB driver for the first time. If you do not see a window that is similar to the one described above after 30s, and the device is not functional, remove the USB cable from the MAX9856 EV kit board and reconnect it. Administrator privileges are required to install the USB device driver on Windows 2000/XP. Refer to the USB_Driver_Help.PDF document included with the software if you have trouble during this step. 10) 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 as C:\Program Files\MAX9856 (default installation directory) using the Browse button. 11) Start the MAX9856 program by opening its icon in the Start menu. The setup wizard Step 1 of 2 window appears (Figure 1). 12) In the Line Inputs group box, check LINEIN1/ LINEIN2. In the Digital Audio Inputs group box, select S/PDIF. 13) Click the Continue button. The setup wizard Step 2 of 2 window appears, as shown in Figure 2. 14) In the Analog Outputs group box, check Headphone. In the Digital Audio Outputs group box, select S/PDIF. 15) Click the Finish button. The software main window appears (Figure 3). 2) Connect a single RCA cable between the S/PDIF IN jack (J12) and the S/PDIF OUT jack (J11). 16) Verify that the Hardware: connected message is displayed in the status bar of the software main window. This indicates the proper operation of the EV kit. 3) Connect a stereo analog audio source to LINEIN1 and LINEIN2. 17) Audio should be at the headphones in approximately 2s. 4) Insert a pair of headphones into the HEADPHONE jack (J3). 18) Click the OK button when a reminder window appears. 5) Enable the stereo audio source output. 6) Visit (www.maxim-ic.com/evkitsoftware) to download the latest version of the EV kit software, 9856Rxx.ZIP. 4 _______________________________________________________________________________________ MAX9856 Evaluation Kit Setup Wizard When the program starts up, a software setup wizard helps the user set up the software quickly. The wizard collects information about the EV kit’s audio inputs and outputs. The software then configures the EV kit automatically for the user. Software Main Window The left-hand side of the main window (Figure 3) includes 10 tabs. On each tab, the user can exercise a group of related configurations. Each control on the GUI generates the expected I 2 C write operation to update the internal registers of the MAX9856 and other I2C devices on the EV kit. The right-hand side of the main window displays the data sent to and read from the MAX9856, as well as the status of the MAX9856. Also, the S/PDIF receiver and transmitter can be enabled and disabled here. Figure 1. MAX9856 Evaluation Software (Setup Wizard Step 1 of 2) _______________________________________________________________________________________ 5 Evaluates: MAX9856 Detailed Description of Software Evaluates: MAX9856 MAX9856 Evaluation Kit Figure 2. MAX9856 Evaluation Software (Setup Wizard Step 2 of 2) Figure 3. MAX9856 Evaluation Software (Main Window) 6 _______________________________________________________________________________________ MAX9856 Evaluation Kit Evaluates: MAX9856 MAX9856 I2C Interface Activity The MAX9856 I2C Interface Activity group box (Figures 3 and 4) indicates the Register Address and Data Sent/Received to or from the register. Use this data to verify that a proper value is written to or read from the MAX9856. Some operations may include several continuous register read or write, but only the last register read or write operation is displayed. Figure 4. MAX9856 Evaluation Software (MAX9856 I2C Interface Activity Group Box) MAX9856 Status The current status is reported in the MAX9856 Status group box (Figures 3 and 5). Click the Read Status button to poll the status of the MAX9856. Check the Interrupt Enable checkbox next to the desired indicator to trigger hardware interrupts when the alert condition occurs. If an interrupt is generated, the IRQ Status (Active Low) indicator label displays a status “0” in red color. Figure 5. MAX9856 Evaluation Software (MAX9856 Status Group Box) S/PDIF Receiver The S/PDIF Receiver group box (Figures 3 and 6) controls the action of the on-board S/PDIF receiver. Check Disable to disable the receiver. Select the electrical or optical input by clicking the appropriate radio button. S/PDIF Transmitter The S/PDIF Transmitter group box (Figure 3) controls the action of the on-board S/PDIF transmitter. Check Disable to disable the transmitter. Both electrical and optical outputs are simultaneously available. Figure 6. MAX9856 Evaluation Software (MAX9856 S/PDIF Receiver Group Box) _______________________________________________________________________________________ 7 Evaluates: MAX9856 MAX9856 Evaluation Kit Options Menu Advanced User Interface In addition to the main control interface, direct I2C commands can be issued to any part on the EV kit through the Interface (Advanced Users) menu item available from the Options menu bar. The 2-wire interface diagnostics allow I2C operations, such as read byte and write byte, to be executed. Uncheck the Auto Read checkbox before using the 2-wire interface diagnostics. The I2C dialog boxes accept numeric data in binary, decimal, or hexadecimal. Hexadecimal numbers should be prefixed by $ or 0x. Binary numbers must be exactly eight digits. See Figure 7 for an example of this control method. View Register Settings From the Options menu bar, select View Register Settings to display the current register settings of the MAX9856 (Figure 8) and optionally save them to a text file. Save Settings … and Load Settings … From the Options menu bar, select Save Settings … to save the current EV kit configuration to a text file that can be loaded at a later time. Select Load Settings … to reload settings from a saved file. Figure 7. Advanced User Interface Window (2-Wire Interface Tab) 8 _______________________________________________________________________________________ MAX9856 Evaluation Kit SETTING DESCRIPTION 48kHz digital audio playback Inputs: Digital audio on S/PDIF IN Outputs: Stereo headphones and line outputs 48kHz digital and analog audio playback Inputs: Digital audio on S/PDIF IN and analog line inputs Outputs: Stereo headphones and line outputs 32kHz microphone record Inputs: Stereo external microphones Outputs: Digital audio on S/PDIF OUT Analog playback Inputs: Analog line inputs Outputs: Stereo headphones and line outputs 48kHz digital audio loopback through on-board jumper JU1 Inputs: Analog line inputs Loopback: I2S digital audio output connected to I2S input operating at 48kHz stereo audio mode Outputs: Stereo headphones and line outputs (on JU1, remove the shunts on row 6 and row 7 and connect pin 17 to pin 20 directly) 32kHz microphone digital loopback Inputs: Stereo external microphones Loopback: I2S digital audio output connected to I2S input operating at 32kHz stereo audio mode Outputs: Stereo headphones and line outputs (on JU1, remove the shunts on row 6 and row 7 and connect pin 17 to pin 20 directly) 48kHz digital audio loopback through onboard S/PDIF transceivers Inputs: Analog line inputs Loopback: I2S digital audio output transmitted and received through on-board S/PDIF transceivers operating at 48kHz stereo audio mode Outputs: Stereo headphones and line outputs Launch Wizard Menu Click on the Launch Wizard menu item shown in Figure 3 to launch the setup wizard and let the software configure the EV kit automatically. Figure 8. MAX9856 Evaluation Software (MAX9856 Register View Window) Presets Menu Click on the Presets menu item shown in Figure 3 to access seven preconfigured operating modes for the EV kit. These presets quickly configure the MAX9856 in the operating mode listed in Table 1. Once a preset has been selected, use the main interface to optimize the settings as desired. Power Management Tab The Power Management tab (Figure 9) controls the MAX1799 power-management IC on the EV kit. Move the DVDD track bar to adjust the supply voltage for DVDD on the MAX9856. Move the AVDD track bar to adjust the supply voltage for AVDD and CPVDD on the MAX9856. Check the CODEC Power Enable checkbox to turn on the MAX9856. _______________________________________________________________________________________ 9 Evaluates: MAX9856 Table 1. EV Kit Preset Configurations Evaluates: MAX9856 MAX9856 Evaluation Kit Figure 9. MAX9856 Evaluation Software (Power Management Tab) Clock Setup Tab DAC Tab The Clock Setup tab (Figure 10) controls the master clock source for the MAX9856. Choose Recovered Master Clock (10MHz - 60MHz) when recovered clock from the S/PDIF receiver is used as the MAX9856 master clock. The master clock can also be chosen from the on-board 12MHz crystal or from an external clock applied on SMA connector J10. When an external master clock is selected, the user should type the exact value of the external supplied clock frequency in the Frequency edit box and then click the Set button. The MAX9856 Operation Mode group box puts the MAX9856 into either master or slave mode. The DAC tab (Figure 11) controls the functionality of the left- and right-channel DACs on the MAX9856. The DACs can be shut down if they are not used. The right-channel DAC can only be enabled when the leftchannel DAC is enabled. If the left DAC is disabled, the right DAC is disabled as well. 10 Check the LRCLK_D Invert checkbox or the BCLK Invert checkbox to invert the waveform of the LRCLK or BCLK clock line on the I2S input interface. DAC modulation rate can be selected by clicking the Modulator Rate drop-down list. Check the DAC Data Delay checkbox to delay audio data one BCLK cycle after the frame clock. Check the PCM Mode (Both DAC & ADC) checkbox to set digital audio data in PCM format for ______________________________________________________________________________________ MAX9856 Evaluation Kit Evaluates: MAX9856 Figure 10. MAX9856 Evaluation Software (Clock Setup Tab) Figure 11. MAX9856 Evaluation Software (DAC Tab) ______________________________________________________________________________________ 11 Evaluates: MAX9856 MAX9856 Evaluation Kit both the DACs and ADCs. (Note: The on-board S/PDIF transmitter and receiver do not support PCM mode.) The High Sample Rate Mode checkbox is automatically checked if DAC sample rate is greater than 50kHz. Click on the Word Size (Both DAC & ADC) drop-down list to select the DAC and ADC resolution to 16 or 18 bits per sample. When the MAX9856 is in master mode, the DPLLEN bit is always set to 0. When the MAX9856 is in slave mode, the DPLLEN bit can be set to 1 or 0 by either checking or unchecking the DAC PLL Enable checkbox. DAC sample rate can be selected by clicking the DAC Sample Rate drop-down list. ADC Tab The ADC tab (Figure 12) controls the functionality of the left- and right-channel ADCs on the MAX9856. The ADCs can be shut down if they are not used. The right-channel ADC can only be enabled when the leftchannel ADC is enabled. If left ADC is disabled, the right ADC is disabled as well. Check the LRCLK_A Invert checkbox or BCLK Invert checkbox to invert the waveform of the LRCLK or BCLK clock line on the I2S output interface. Click LRCLK_A Pin Configuration drop-down list to select the LRCLK_A pin functionality. If the ADCs do not share the same sample frequency with the DACs, the ADCs’ sample frequency can be set separately. When the Figure 12. MAX9856 Evaluation Software (ADC Tab) 12 ______________________________________________________________________________________ MAX9856 Evaluation Kit The ADC Output Gain and the ADC Noise Gate Threshold can be set by moving their respective track bars. Digital Filters Tab The MAX9856 includes digital first-order highpass filters for both the DACs input and the ADCs output. Based on the sample frequencies selected, the DAC Input -3dB Cutoff Frequency and the ADC output -3dB Cutoff Frequency can be set by moving their respective track bars (Figure 13). Figure 13. MAX9856 Evaluation Software (Digital Filters Tab) ______________________________________________________________________________________ 13 Evaluates: MAX9856 ADCs share the same sample frequency with the DACs, the LRCLK_A pin can be used as a general-purpose IO (GPIO) pin. Check the ADC Data Delay checkbox to delay audio data one BCLK cycle after the frame clock. The PCM mode and word size control registers apply to both the ADCs and the DACs. When the MAX9856 is in master mode, the APLLEN bit is always set to 0. When the MAX9856 is in slave mode, the APLLEN bit can be set to 1 or 0 by checking or unchecking the ADC PLL Enable checkbox. Evaluates: MAX9856 MAX9856 Evaluation Kit MIC AGC Tab Audio Inputs Tab On the MIC AGC tab (Figure 14), the AGC Release Time, Attack Time, Hold Time, AGC & Noise Gate Signal Source, and AGC Signal Threshold can be configured. When AGC is enabled, the gain on the left microphone channel is automatically monitored. The MAX9856 includes various audio inputs and their gains are programmable. The Digital Audio Input PGA, AUXIN PGA, LINEIN1/LINEIN2 PGA, and Left/Right MIC PGA are set by moving their respective track bars, as shown in Figure 16. Left and right microphone preamplifiers can be set in the Left MIC Preamplifier and Right MIC Preamplifier drop-down lists. The microphones can be muted by checking the Mute Left & Right MIC checkbox. The MICBIAS Voltage can be selected from +1.5V or +2.4V (only when AVDD v 2.7V). The left microphone input can be either a pseudo differential input (MICL/MICGND) or a differential input (INLP/INLN), while the right microphone input can only be a pseudo differential input (MICR/MICGND). Analog Mixers Tab The MAX9856 has two main analog mixers shown in Figure 15. The Left/Right ADC Input Mixer can select from AUXAC, LINEIN1, LINEIN2, MICL, and MICR. The Left/Right Audio Output Mixer can select from MICL PGA Output, MICR PGA Output, LINEIN1, LINEIN2, DACL Output, and DACR Output. Figure 14. MAX9856 Evaluation Software (MIC AGC Tab) 14 ______________________________________________________________________________________ MAX9856 Evaluation Kit Evaluates: MAX9856 Figure 15. MAX9856 Evaluation Software (Analog Mixers Tab) Figure 16. MAX9856 Evaluation Software (Audio Inputs Tab) ______________________________________________________________________________________ 15 Evaluates: MAX9856 MAX9856 Evaluation Kit Audio Outputs Tab Headset Detect Tab On the Audio Outputs tab (Figure 17), the Line Output Enable checkbox can enable or disable the line output. The headphone can be muted by checking the Mute Headphone checkbox. The gain of the headphones can be set from -73.5dB to +6dB by moving the left or the right headphone volume track bars. Check the Volume Slewing Enable checkbox to give a smooth sounding gain change. Check AUXIN DC Measurement Enable to directly connect the AUXIN to ADC input for DC measurement (JU5 must be closed). The AUXIN signal can be directly mixed into the headphone amplifiers by checking the Mix AUXIN Directly into the Headphone checkbox. The headphone output mode can be set by selecting the Headphone Output Mode drop-down list. The Headset Detect tab (Figure 18) demonstrates how a headset insertion or removal can be detected. The state of popular headset jack pins can be measured to configure the headset properly. Check Enable Detect (0x1B, JDETEN) to activate the headset-detection circuitry. The detection result is reported in the Headset Presence group box. If the Auto Read checkbox is checked, the software automatically monitors the insertion and removal of a headset and reports the result in the Headset Presence group box. If there is a headset configuration change, the software automatically detects the headset impedance and reports the result in the Headset Impedance group box. Troubleshooting The MAX9856 software automatically searches for all of the on-board I2C devices. Any missing I2C device is reported in a message window (Figure 19). Figure 17. MAX9856 Evaluation Software (Audio Outputs Tab) 16 ______________________________________________________________________________________ MAX9856 Evaluation Kit Evaluates: MAX9856 Figure 18. MAX9856 Evaluation Software (Headset Detect Tab) Figure 19. MAX9856 Evaluation Software (Missing I2C Device Message) ______________________________________________________________________________________ 17 Detailed Description of Hardware 1 2 LINEIN2 C74 1μF 3 4 C36 1μF INLN INLP 33 32 31 DVDD DGND 34 INLN 35 C45 1μF C44 1μF INLP MICR 36 C43 1μF MICL 37 C40 1μF MICGND 38 C39 1μF MICBIAS AGND C78 1μF LINEIN1 39 JACKSNS 40 C38 1μF EXTMICL EXTMICGND EXTMICR C81 1μF DVDD signals to allow for easy connection with consumer electronics devices. Access the S/PDIF inputs though the RCA connector at J12. Access the S/PDIF outputs through the RCA connector at J11. All S/PDIF connections function for sample rates from 32kHz to 96kHz. To transmit lower sample rates, connect a serial audio transmitter or receiver directly to the MAX9856. To connect the EV kit using optical cables, install TOSLINK connectors on J13 and J14. The MAX9856 EV kit is a complete digital audio evaluation system for the MAX9856 audio CODEC. The portion of the EV kit required to operate the MAX9856 is shown in Figure 20. All additional components are included to aid evaluations. In addition to providing access to all MAX9856 audio inputs and outputs, the EV kit provides translation of the on-board serial digital audio signals to coaxial S/PDIF MCLK LINEIN1 LRCLK_A LINEIN2 AUXIN DVDDSS2 PREG SDIN 30 29 DVDDS2 28 27 C85 1μF U1 5 C35 1μF C34 1μF BCLK 24 R13 10kΩ 23 IRQ LGNDSNS SDA LOUTL 11 12 13 14 15 16 17 18 19 22 21 CPVDD C1P CPGND C1N SCL PVSS LOUTR SVSS 10 IRQ HPR 9 REF HPL 8 25 DVDDS2 AVDD LOUTL 26 MBIAS LRCLK_D 7 LOUTR SDOUT MAX9856 6 C33 1μF NREG HGNDSNS 20 AVDD AVDD C31 10μF C30 4.7μF HPR C32 0.1μF HPL Evaluates: MAX9856 MAX9856 Evaluation Kit C28 0.1μF C27 10μF C29 4.7μF Figure 20. Minimum Required EV Kit Components 18 ______________________________________________________________________________________ MAX9856 Evaluation Kit JUMPER JU1 JU2 JU4 JU5 JU6, JU7 JU8 SHUNT POSITION 1-2* (all rows) Open (all rows) External I2S interface and I2C interface LRCLK_A used as GPIO LRCLK_A used as ADC LRCLK Open JACKSNS pin connected to the headphone jack pin 4 JACKSNS pin has no connection Connected* DC-coupled AUXIN Open AC-coupled AUXIN Connected* Open Connected* Connected* Open JU10 On-board I S interface and I2C interface 1-2 Open JU9 DESCRIPTION 2 2-3* Connected* Connected* Open Evaluates: MAX9856 Table 2. EV Kit Jumper Settings Internal microphone biased by MICBIAS No bias applied on internal microphone inputs DVDD connected to the MAX1799 OUT2 DVDD ranges from 1.8V to 3.3V External DVDD can be applied on the DVDD pad AVDD connected to the MAX1799 OUT3 AVDD ranges from 1.8V to 3.3V External AVDD can be applied on the DVDD pad DVDDS2 connected to the MAX1799 OUT1 DVDDS2 is fixed at 3.3V External DVDDS2 can be applied on the DVDDS2 pad *Default position. Access the analog line inputs through RCA connectors at J6 and J7. Access the analog line outputs through RCA connectors at J4 and J5. Connect headphones to the DirectDrive headphone output of the MAX9856 through the 3.5mm headphone jack (J3). Connect external microphones through the 3.5mm microphone jack (J8). The remaining inputs and outputs of the MAX9856 are accessible through pads on the right and bottom sides of the EV kit. See Table 2 for a description of all EV kit jumper configurations. Power Management The USB host supplies 5V power to the MAX1799. When the EV kit is connected to a PC, the MAX1799 generates a 3V output on the OUT1 pin so that all the I2C interfaces on the board are working. After the software is running, the DVDD and AVDD can be configured to power the MAX9856. See Table 3 for a listing of each EV kit supply. Table 3. EV Kit Power Supplies EV KIT SUPPLY DESCRIPTION MAX1799 PMIC Input: VUSB from USB host Output: VMOD, VVCO, DVDD, AVDD VMOD, VVCO 3.3V supply that powers every IC except the MAX9856 DVDD 1.8V to 3.3V supply that powers DVDD on the MAX9856 AVDD 1.8V to 3.3V supply that powers AVDD and CPVDD on the MAX9856 DVDDS2 Digital audio interface I/O power supply for the MAX9856 ______________________________________________________________________________________ 19 Evaluates: MAX9856 MAX9856 Evaluation Kit Differential (Internal) Microphone Connection R22 and R44 provide microphone bias connections for the internal differential microphone input. Remove the shunts on JU6 and JU7 to remove the microphone bias. Stereo (External) Microphone Connection R16 and R17 provide external left and right microphone bias. Use the EXTMICGND pin for the ground connection of all microphones connected to this interface. Control and Data Interface JU1 connects the MAX9856 digital I/O pins to the rest of the EV kit. For normal operation, install a shunt across pins 1-2 of each row of JU1 (Figure 21). Remove shunts as necessary to connect equipment or other components directly to the MAX9856. Pin 3 of each row provides a clean connection to the digital ground plane of the EV kit for grounding test leads. Place a shunt between pin 2 of SDIN and pin 2 of SDOUT to place the digital audio interface in loopback mode. This process routes data from the ADC directly back into the DAC for testing purposes. Clocking On-Board Clock The MAX9856 EV kit features an on-board 12MHz crystal clock oscillator to provide the necessary master clock for the MAX9856. Recovered Clock When S/PDIF IN has digital audio input and the S/PDIF receiver is in operation, the recovered clock from the S/PDIF receiver can be used as the master clock for the MAX9856. External Clocks Connect an external clock source to the SMA connector (J10) to drive the MAX9856’s MCLK pin without using the on-board oscillator. When using an external clock, the User Provided Clock (10MHz – 60MHz) option must be selected on the Clock Setup tab (Figure 10). The user must type in the correct clock frequency in the Frequency edit box. Populate R21 and C49 as appropriate to provide termination for the incoming signal. Using an Alternative I2C Interface Connect an I2C master to the SDA and SCL pads of the MAX9856 EV kit to communicate with the I 2C parts without using the on-board I2C signals generated by the microcontroller (U2). See Table 4 to determine the I2C address of each device on the EV kit. All I2C addresses are fixed in hardware. Table 4. I2C Addresses DEVICE MAX9856 (U1) MAX1799 (U3) MAX1609 (U11) CS8406 (U15) CS8416 (U16) I2C ADDRESS 0010 000 0111 111 0100 100 0010 011 0010 100 Figure 21. Header JU1 20 ______________________________________________________________________________________ MAX9856 Evaluation Kit Evaluates: MAX9856 Figure 22a. MAX9856 EV Kit Schematic (Sheet 1 of 6) ______________________________________________________________________________________ 21 Evaluates: MAX9856 MAX9856 Evaluation Kit Figure 22b. MAX9856 EV Kit Schematic (Sheet 2 of 6) 22 ______________________________________________________________________________________ MAX9856 Evaluation Kit Evaluates: MAX9856 Figure 22c. MAX9856 EV Kit Schematic (Sheet 3 of 6) ______________________________________________________________________________________ 23 Evaluates: MAX9856 MAX9856 Evaluation Kit Figure 22d. MAX9856 EV Kit Schematic (Sheet 4 of 6) 24 ______________________________________________________________________________________ MAX9856 Evaluation Kit Evaluates: MAX9856 Figure 22e. MAX9856 EV Kit Schematic (Sheet 5 of 6) ______________________________________________________________________________________ 25 Evaluates: MAX9856 MAX9856 Evaluation Kit Figure 22f. MAX9856 EV Kit Schematic (Sheet 6 of 6) 26 ______________________________________________________________________________________ MAX9856 Evaluation Kit Evaluates: MAX9856 Figure 23. MAX9856 EV Kit Component Placement Guide—Component Side ______________________________________________________________________________________ 27 Evaluates: MAX9856 MAX9856 Evaluation Kit Figure 24. MAX9856 EV Kit PCB Layout—Component Side 28 ______________________________________________________________________________________ MAX9856 Evaluation Kit Evaluates: MAX9856 Figure 25. MAX9856 EV Kit PCB Layout—Inner Layer 2 ______________________________________________________________________________________ 29 Evaluates: MAX9856 MAX9856 Evaluation Kit Figure 26. MAX9856 EV Kit PCB Layout—Inner Layer 3 30 ______________________________________________________________________________________ MAX9856 Evaluation Kit Evaluates: MAX9856 Figure 27. MAX9856 EV Kit PCB Layout—Solder Side ______________________________________________________________________________________ 31 Evaluates: MAX9856 MAX9856 Evaluation Kit Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 0 6/08 Initial release — 1 3/10 Replaced Figure 17 16 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. 32 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.