MAX9850 CMOD232 MAX9850EVCMOD2 MAX9850EVKIT C2012X5R0J106M C1005X5R0J105M - Datasheet Archive

 

MAX9850 Evaluation System/Evaluation Kit The MAX9850 evaluation system (EV system) consists of a MAX9850 evaluation kit (EV kit),

 

19-3423; Rev 3; 3/09 MAX9850 MAX9850 Evaluation System/Evaluation Kit The MAX9850 MAX9850 evaluation system (EV system) consists of a MAX9850 MAX9850 evaluation kit (EV kit), a companion Maxim command module (CMOD232 CMOD232) interface board, and software. The MAX9850 MAX9850 EV kit is a fully assembled and tested surface-mount printed circuit board (PCB) that evaluates the MAX9850 MAX9850 headphone stereo DAC with integrated headphone driver. The EV kit is designed to be driven by any digital audio Sony/Philips Digital Interface (S/PDIF) audio source and can be optionally configured to accept generic digital audio or I2S-compatible signals. The EV kit provides RCA jacks for connecting analog input signals. A 3.5mm headphone jack allows for easy connection of headphones to the PCB. The Maxim command module interface board (CMOD232 CMOD232) allows a PC to use its serial port to emulate an I2C 2-wire interface. Windows® 98/2000/XP-compatible software, which can be downloaded from the Maxim website, provides a user-friendly interface to exercise the features of the MAX9850 MAX9850. The program is menu driven and offers a graphical user interface (GUI) with control buttons and a status display. The MAX9850 MAX9850 EV system (MAX9850EVCMOD2 MAX9850EVCMOD2#) includes both the EV kit and the CMOD232 CMOD232 interface board. Order the MAX9850 MAX9850 EV kit (MAX9850EVKIT MAX9850EVKIT#) if you already have a command module interface. Features 1.8V to 3.6V Single-Supply Operation I2C-Compatible 2-Wire Serial Interface Selectable Optical/Electrical S/PDIF Input On-Board 12MHz Crystal Oscillator On-Board Digital Audio Receiver No Detectable Clicks or Pops Easy-to-Use Menu-Driven Software Assembled and Tested Includes Windows 98/2000/XP-Compatible Software and Demo PCB Ordering Information I2C IC INTERFACE PACKAGE TYPE 0°C to +70°C 28 TQFN Not included TEMP RANGE PART MAX9850EVKIT MAX9850EVKIT# MAX9850EVCMOD2 MAX9850EVCMOD2# 0°C to +70°C 28 TQFN CMOD232 CMOD232 #Denotes RoHS compliant. Note: The CMOD232 CMOD232 board is required to interface the EV kit to the computer when using the software. Windows is a registered trademark of Microsoft Corp. Component Lists MAX9850 MAX9850 EV System PART QTY DESCRIPTION MAX9850EVKIT MAX9850EVKIT# 1 MAX9850 MAX9850 EV kit CMOD232 CMOD232+ 1 SMBus/I2C interface board AC Adapter 1 9VDC at 200mA (powers the CMOD232 CMOD232 board) MAX9850 MAX9850 EV Kit (continued) #Denotes RoHS compliant. DESIGNATION QTY C5­C8 4 10F ±20%, 6.3V X5R ceramic capacitors (0805) TDK C2012X5R0J106M C2012X5R0J106M C9­C12, C15­ C23, C30, C31, C37, C43 17 1.0F ±20%, 6.3V X5R ceramic capacitors (0402) TDK C1005X5R0J105M C1005X5R0J105M C13 1 2.2F ±20%, 6.3V X5R ceramic capacitor (0603) TDK C1608X5R0J225M C1608X5R0J225M C14 1 0.47F ±20%, 16V X7R ceramic capacitor (0603) TDK C1608X7R1C474M C1608X7R1C474M C24­C29, C35, C44, C45 9 0.1F ±20%, 10V X5R ceramic capacitors (0402) TDK C1005X5R1A104M C1005X5R1A104M +Denotes lead-free and RoHS compliant. MAX9850 MAX9850 EV Kit DESIGNATION C1, C2 C3, C4 QTY 2 0 DESCRIPTION 220F ±20%, 6.3V tantalum capacitors (C-case) AVX TPSC227M006R0070 TPSC227M006R0070 or AVX TPSC227M006R0100 TPSC227M006R0100 Not installed, capacitors (C-case) DESCRIPTION _ 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: MAX9850 MAX9850 General Description MAX9850 MAX9850 Evaluation System/Evaluation Kit Evaluate: MAX9850 MAX9850 Component Lists (continued) DESIGNATION QTY C32, C33, C34, C36, C38, C39 6 C40 1 C41 1 DESCRIPTION 0.01F ±5%, 25V C0G ceramic capacitors (0603) TDK C1608C0G1E103J C1608C0G1E103J 0.022F ±10%, 25V X7R ceramic capacitor (0402) TDK C1005X7R1E223K C1005X7R1E223K DESIGNATION QTY R11 1 3.01k ±1% resistor (0603) DESCRIPTION R14 0 Not installed, resistor-short (PC trace) (1206) R15 1 4.7k ±5% resistor (0603) SW1 0 Not installed 1000pF ±5%, 50V C0G ceramic capacitor (0603) TDK C1608C0G1H102J C1608C0G1H102J U1 1 Stereo audio DAC (28 TQFN) Maxim MAX9850ETI MAX9850ETI+ U2 1 192kHz digital audio receiver (28 TSSOP) Cirrus Logic CS8416-CZZ CS8416-CZZ U3 1 Level translator (10 µMAX®) Maxim MAX1840EUB MAX1840EUB+ 1 16-bit, dual-supply bus transceiver (48 TSSOP) Texas Instruments SN74AVCAH164245GR SN74AVCAH164245GR 1 Dual/triple voltage microprocessor supervisor (5 SC70) (Top Mark: AFS) Maxim MAX6736XKTGD3 MAX6736XKTGD3+ U6, U7 2 2:1 noninverting multiplexers (6 SC70) Fairchild Semi NC7SV157P6X NC7SV157P6X_NL (Top Mark: VF7) U8 1 Schmitt trigger buffer (5 SC70) Fairchild Semi NC7SV17P5X NC7SV17P5X_NL (Top Mark: V17) Y1 1 Low-jitter crystal clock oscillator CTS Frequency Controls CB3LV-3C-12 CB3LV-3C-12.0000-T 0000-T - 3 Shunts - 1 PCB: MAX9850 MAX9850 Evaluation Kit# C42 0 Not installed (0603) J1 1 2 x 10 right-angle female receptacle J2 1 Digital audio optical receiver Toshiba TORX147L J3, J5 2 Phono jacks, red J4, J6 2 Phono jacks, white J7 1 Phono jack, yellow J8 1 Switched stereo headphone jack (3.5mm dia) J9 1 SMA PC-mount connector J10 1 8-pin header JU1 1 Dual-row 6-pin header JU2 1 2-pin header JU3 1 3-pin header L1 1 3.3H ±10%, 270mA inductor (1812) Coilcraft 1812CS-332XKL 1812CS-332XKL L2 1 47H ±10%, 200mA inductor (1812) Coilcraft 1812LS-473XKL 1812LS-473XKL U4 R1, R2, R3, 4 1k ±5% resistors (0603) R4 1 47k ±5% resistor (0603) R5 1 75 R6, R7, R8, R12 0 Not installed, resistors (0603) R9, R10 2 1k U5 ±5% resistor (0603) #Denotes RoHS compliant. ±5% resistors (0402) Component Suppliers SUPPLIER AVX Corp. PHONE FAX 843-946-0238 843-626-3123 WEBSITE www.avxcorp.com Coilcraft, Inc. 847-639-6400 847-639-1469 www.coilcraft.com TDK Corp. 847-803-6100 847-390-4405 www.component.tdk.com Note: Indicate that you are using the MAX9850 MAX9850 when contacting these component suppliers. µMAX is a registered trademark of Maxim Integrated Products, Inc. 2 _ MAX9850 MAX9850 Evaluation System/Evaluation Kit FILE DESCRIPTION INSTALL.EXE Installs the EV kit files on your computer MAX9850 MAX9850.EXE Application program UNINST.INI Uninstalls the EV kit software Quick Start Recommended Equipment · Computer running Windows 98, 2000, or XP · Serial port (this is a 9-pin socket on the back of the computer) · Standard 9-pin, straight-through, male-to-female cable (serial extension cable) to connect the computer's serial port to the Maxim command module interface board · CMOD232 CMOD232 command module with included wall cube power source · Two 3.0V/100mA DC power supplies · One pair of headphones (16 or greater) · One digital audio S/PDIF signal source Procedure The MAX9850 MAX9850 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) 2) 3) 4) Command Module Setup Enable the SDA/SCL pullup resistors on the command module by setting both switches (SW1) to the on position. Set the command module working voltage to 3.3V by placing a shunt across pins 1-2 of the VDD select jumper. Connect a cable from the computer's serial port to the command module (CMOD232 CMOD232) interface board. Use a straight-through 9-pin male-to-female cable. To avoid damaging the EV kit or your computer, do not use a 9-pin null-modem cable or any other proprietary interface cable that is physically similar to the straight-through cable. Connect the provided wall cube power supply to the CMOD232 CMOD232 board. EV Kit Setup 1) Visit www.maxim-ic.com/evkitsoftware to download the latest version of the EV kit software, 9850Rxx.ZIP. Save the EV kit software to a temporary folder and uncompress the ZIP file. 2) Install the EV kit software on your computer by running the INSTALL.EXE program inside the temporary folder. The program files are copied and icons are created in the Windows Start | Programs menu. 3) Ensure that the I2C address of the MAX9850 MAX9850 is set to 0x20h by verifying that a shunt is placed across pins 1-2 of jumper JU1. 4) Ensure that a shunt is installed on jumper JU2 5) Connect the first 3.0V power supply to the DVDD and corresponding GND pads. 6) Connect the second 3.0V power supply to the PVDD and corresponding GND pads. 7) Connect the S/PDIF signal source to either J2 (optical) or J7 (electrical) 8) Insert a pair of 16 headphones into the headphone jack J8. 9) Carefully align the 20-pin connector of the MAX9850 MAX9850 EV kit with the 20-pin header of the CMOD232 CMOD232 interface board. Gently press them together. 10) Plug the CMOD232 CMOD232 wall cube into an electrical outlet. 11) Turn on both of the 3.3V power supplies 12) Enable the stereo audio sources. 13) Start the MAX9850 MAX9850 program by opening its icon in the Start | Programs menu. 14) Normal device operation can be verified by the "Status: MAX9850 MAX9850 Operational" text in the Interface box. 15) To autoconfigure the MAX9850 MAX9850 in a functional state, use the "auto setup" feature in the MAX9850 MAX9850 software. _ 3 Evaluate: MAX9850 MAX9850 MAX9850 MAX9850 EV Kit Files Evaluate: MAX9850 MAX9850 MAX9850 MAX9850 Evaluation System/Evaluation Kit Figure 1. MAX9850 MAX9850 EV Kit Software Main Window Detailed Description of Software Note: Words in bold are user-selectable features and status flags in the software. User-Interface Panel The user interface (Figure 1) is easy to operate; use the mouse, or a combination of the Tab and Arrow keys to manipulate the software. Each of the buttons corresponds to bits in the command and configuration bytes. By clicking on them, the correct I2C write opera4 tion is generated to update the internal registers of the MAX9850 MAX9850 or the on-board S/PDIF receiver. The software divides EV kit functions into logical blocks. The Interface box indicates the current Device Address, the Register Address Sent, and the Data Sent/Received for the last read/write operation. This data is used to confirm proper device operation. Headphone, Power, Clock Setup, Digital Audio/ Configuration, and Receiver functions are accessed through tab sheets. MAX9850 MAX9850 status and interrupt control are accessed through the MAX9850 MAX9850 Status box. _ MAX9850 MAX9850 Evaluation System/Evaluation Kit 2) Power up the receiver IC as well as vital sections of the MAX9850 MAX9850. 3) Set internal clock dividers based on the incoming master clock frequency. 4) Set the MSB(14:8) and LSB(7:0) bits based on the desired mode of operation. 5) Set the charge-pump clock division bits if the MAX9850 MAX9850 is not using the internal oscillator. The Auto Setup button is intended to simplify user interaction by placing the EV kit into a known-good mode of operation. MAX9850 MAX9850 Status/Interrupt The MAX9850 MAX9850 EV kit software defaults to a state that continually polls the device for new status data and monitors the alert conditions. The contents of the status register are displayed in the MAX9850 MAX9850 Status group box (Figure 2). Changes in the GPIO state, PLL lock, headphones present, volume, and output overload can be set to trigger an interrupt by checking the checkbox next to the desired information. To disable continuous polling of data, uncheck the Automatic Status Read checkbox (Figure 1). Force a manual status register read by clicking the Read Status button. If an interrupt condition is generated, the message INTERRUPT appears next to the interrupt status label. If enabled, the program will disable automatic reading of the status register. Status Bar The status bar (Figure 3) displays the MAX9850 MAX9850 master clock, internal clock, and charge-pump clock frequencies. By default it is updated automatically; however, this feature can be turned off (see the Clock Setup section). Headphone Control Figure 2. MAX9850 MAX9850 EV Kit Software Status Window The Headphones tab (Figure 1) allows access to the MAX9850 MAX9850 headphone-related controls. Headphone volume can be adjusted in dB increments by adjusting the Volume Control slider. The dB increments are not evenly spaced and are detailed further in the MAX9850 MAX9850 data sheet. Alternatively, a number can be entered in the box below the Volume Control slider. If a number that does not match a predefined dB increment is entered, the software automatically rounds the number to the nearest valid dB increment and sends the appropriate I2C data to the MAX9850 MAX9850. Mute the HP output by selecting the Mute checkbox. Additional headphone control is also provided through the Headphone Features box. Slew Rate Control is controlled through the respective check and drop- Figure 3. MAX9850 MAX9850 EV Kit Software Status Bar _ 5 Evaluate: MAX9850 MAX9850 The status bar displays vital MAX9850 MAX9850 clock information. Return the EV kit to its power-on-reset state by clicking the POR Reset button. Power up the MAX9850 MAX9850 by clearing the MAX9850 MAX9850 Global Shutdown checkbox. Power up the receiver (U2) by selecting the Receiver Enabled checkbox. The MAX9850 MAX9850 EV kit software features additional functions to simplify operation. Automatic Diagnostics probes the command module board and the MAX9850 MAX9850 EV kit to make sure that all connections are made, and all devices are working. This will create some activity on the I2C bus. The Silence I2C-bus Activity checkbox will reduce I2C bus activity to allow easy triggering of an oscilloscope. The Auto Setup button further reduces user input. When this button is pressed, the software will do the following: 1) Search both EV kit S/PDIF inputs for a valid signal and then set the on-board multiplexer accordingly. Evaluate: MAX9850 MAX9850 MAX9850 MAX9850 Evaluation System/Evaluation Kit Figure 4. MAX9850 MAX9850 EV Kit Software Power Tab down boxes. Zero-Crossing Detection and Debounce Delay are also controlled through the interface. For a detailed description of zero-crossing detection and debounce delay, refer to the MAX9850 MAX9850 data sheet. Clicking the Force Headphone Mono Mode checkbox mutes the right channel and outputs a left/right-channel mix on the left channel. Power Management Power-management features of the MAX9850 MAX9850 are accessed through the Power tab (Figure 4). 6 Power enables for the MCLK input, charge pump, line out, line in, DAC input, and headphone output are accessed through the Power Management box. The MAX9850 MAX9850 charge pump can operate either an internal 666.7kHz oscillator or frequency derived from the master clock. Force the MAX9850 MAX9850 to use the internal oscillator by checking the Use Internal Oscillator checkbox. When the Use Internal Oscillator checkbox is unchecked, set the charge-pump clock divider by adjusting the Clock Division Ratio slider. Refer to the _ MAX9850 MAX9850 Evaluation System/Evaluation Kit Evaluate: MAX9850 MAX9850 Figure 5. MAX9850 MAX9850 EV Kit Software Clock Setup Tab MAX9850 MAX9850 data sheet for further details about clockdivider operation. By default, the MAX9850 MAX9850 EV kit software writes to the registers when a control is activated. To shut down more that one item during the same I2C write operation, click the Simultaneous Shutdown checkbox. Adjust the other power-control checkboxes to the desired mode of operation and click the GO button. The proper register contents for the new selections will be sent in one I2C write command. Clock Setup Clock configuration features of the MAX9850 MAX9850 are accessed through the Clock Setup tab (Figure 5). On-board multiplexers route a high-frequency square wave to the MAX9850 MAX9850 MCLK input. Select Recovered Master Clock to use the S/PDIF master clock. Select On-Board Crystal Oscillator to use the 12MHz crystal oscillator. Alternatively, a User Provided Clock can be applied to J9 of the MAX9850 MAX9850 EV kit. Enter the correct frequency in the Frequency box just below the User _ 7 Evaluate: MAX9850 MAX9850 MAX9850 MAX9850 Evaluation System/Evaluation Kit Figure 6. Master (Non-Integer) Mode Figure 7. Master (Integer) Mode Provided Clock selection. Depending on the desired mode of operation (see the MAX9850 MAX9850 Mode Setup section) digital audio data can be synchronized to the master clock signal. The on-board S/PDIF receiver performs the synchronization of the digital audio data to the chosen MAX9850 MAX9850 master clock signal. To synchronize the digital audio to the MAX9850 MAX9850 master clock, check the Synchronize Data with Clock checkbox. Note: When using the Recovered Master Clock as the master clock frequency, the digital audio data will always be synchronized. The MAX9850 MAX9850 uses a frequency-divided master clock signal throughout the IC (see the MAX9850 MAX9850 Mode Setup section). Select the desired internal clock-divider ratio from the Internal Clock Divide Ratio pulldown. The MAX9850 MAX9850 EV kit software is capable of calculating the master clock, internal clock, and charge-pump clock frequencies. Press the Update Clocks in Status Bar button to display the calculated values. Checking the Automatically Update Clocks checkbox will update the calculated values on a regular basis. MAX9850 MAX9850 Mode Setup The MAX9850 MAX9850 Mode Setup window alters its appearance depending on which mode is selected. Figures 6­9 show the different appearances of these windows. Both Master (Non-Integer) and Master (Integer) modes of the MAX9850 MAX9850 EV kit software (Figures 6 and 8 Figure 8. Slave (Non-Integer) Mode 7) are similar in operation. Select Manual Control to write directly to the MAX9850 MAX9850 registers. Enter the number in the MSB/LSB edit box in Master (Non-Integer) and LSB in Master (Integer) mode and press the Update button to write to the MAX9850 MAX9850. Alternatively, the Automatic mode can be selected and a desired _ MAX9850 MAX9850 Evaluation System/Evaluation Kit Note: Unchecking either of the lock checkboxes will allow the software to operate in a state that may not be functional. Undesirable results may occur. The GPIO of the MAX9850 MAX9850 is also configured on this tab. Click the desired radio button to alter the Pin Direction or the GPIO Output State. To route the MAX9850 MAX9850 internal interrupt signal to the GPIO pin, check the Enable Interrupt on GPIO checkbox. Receiver Figure 9. Slave (Integer) Mode Left/Right Clock frequency can be entered into the Desired LRCLK Freq edit box. The EV kit software will automatically calculate the correct MSB/LSB values and write them to the MAX9850 MAX9850 registers. The Slave (Non-Integer) mode (Figure 8) of the MAX9850 MAX9850 does not rely on the MSB or LSB registers for operation. Slave (Integer) mode (Figure 9) can be operated manually by entering a number in the LSB edit box. When using the Automatic mode, the MAX9850 MAX9850 EV kit software calculates the correct LSB value and writes it to the appropriate IC register. Digital Audio/Configuration Digital audio control and miscellaneous configuration options are accessed through the Digital Audio/ Configuration tab (Figure 10). In addition to a serial data delay, the MAX9850 MAX9850 can also accept an inverted bit clock (BCLK) or left/right clock (LRCLK). Configure the MAX9850 MAX9850 by checking the desired Invert or Delay checkboxes. Choose the desired Data Format and Justification from the pulldowns. The MAX9850 MAX9850 EV kit software is designed to control both the on-board S/PDIF receiver chip as well as the MAX9850 MAX9850. To maintain a valid digital link between the two ICs, the MAX9850 MAX9850 EV kit software features a Lock checkbox in both the Signals and Word Size group boxes. When the Signals/Lock checkbox is checked, the EV kit software will ensure that BCLK Invert, The MAX9850 MAX9850 EV kit software also controls the onboard S/PDIF receiver. Receiver control and status are divided into two tabs. Receiver Main Control Receiver control is accessed through the Main Control sub-tab, which is located under the Receiver tab (Figure 11). Choose the desired S/PDIF input (Optical or Electrical) in the Digital Audio Input Selection box. Mute the receiver output by checking the Mute Receiver Output checkbox. Activate the receiver's de-emphasis filter by choosing the desired option in the Receiver DeEmphasis Filter box. The on-board digital receiver features programmable error handling. Choose the desired method for handling S/PDIF errors in the Audio Error Handling box. Receiver Status Receiver status is accessed through the Status subtab, which is under the Receiver tab (Figure 12). This tab serves as an invaluable diagnostic tool when evaluating the MAX9850 MAX9850 EV kit. Read the error status by clicking the Read Status button in the Receiver Error Status window. The Monitor checkboxes must be selected for the status bits to be valid. Click the Read Status button in the Status box to read the receiver status. To have the software automatically read the receiver status at constant time intervals, check the Automatic Read checkbox. _ 9 Evaluate: MAX9850 MAX9850 LRCLK Invert, SDIN/OUT Delay, and Justification settings for both the MAX9850 MAX9850 and the on-board S/PDIF receiver match. When the Word Size/Lock checkbox is checked, the EV kit software will ensure that the word size settings for both the MAX9850 MAX9850 and the on-board S/PDIF receiver match. For example, if the MAX9850 MAX9850 BCLK Invert checkbox is altered, the MAX9850 MAX9850 EV kit software automatically changes the Receiver BCLK Invert checkbox to match. All appropriate I2C data will be sent to both ICs and the system will continue to function properly. Evaluate: MAX9850 MAX9850 MAX9850 MAX9850 Evaluation System/Evaluation Kit Figure 10. MAX9850 MAX9850 EV Kit Software Digital Audio/Configuration Tab Simple I2C Commands There are two methods for communicating with the MAX9850 MAX9850: through the normal user-interface panel or through the I2C commands available by selecting the 2-Wire Interface Diagnostic item from the Options pulldown menu. A window is displayed that allows I2C operations, such as read byte and write byte, to be executed. To stop normal user-interface execution so that it does 10 not override the manually set values, turn off the update timer by deselecting the Automatic Status Read and Automatic Diagnostics checkboxes. 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 13 for an example of this control method. _ MAX9850 MAX9850 Evaluation System/Evaluation Kit Evaluate: MAX9850 MAX9850 Figure 11. MAX9850 MAX9850 EV Kit Software Receiver (Main Control) Tab Note: In places where the slave address asks for an 8bit value, it must be the 7-bit slave address of the MAX9850 MAX9850 as determined by ADD with the last bit set to 1 for a read operation or a 0 for a write. Refer to the MAX9850 MAX9850 data sheet for a complete list of registers and functions. Detailed Description of Hardware The MAX9850 MAX9850 EV kit is a complete digital-audio headphone-driver evaluation system. The EV kit is driven by either an optical or electrical S/PDIF digital audio source. The S/PDIF signal is converted through onboard circuitry to compatible digital audio signals. The MAX9850 MAX9850 interfaces with the digital audio signals and drives a pair of headphones. _ 11 Evaluate: MAX9850 MAX9850 MAX9850 MAX9850 Evaluation System/Evaluation Kit Figure 12. MAX9850 MAX9850 EV Kit Software Receiver (Status) Tab Access to the MAX9850 MAX9850 analog inputs and outputs, is provided through RCA jacks J3­J6. Access the MAX9850 MAX9850 headphone outputs through the headphone jack J8 or the provided LEFT, RIGHT, and GND pads. The EV kit also features on-board level translators that allow the on-board S/PDIF receiver to communicate with the MAX9850 MAX9850 over the entire MAX9850 MAX9850 VDD voltage range (1.8V to 3.6V). The CMOD232 CMOD232 command module powers half of the on-board level translators. 12 For optimum performance, digital audio systems require a stable frequency source. The MAX9850 MAX9850 EV kit features an on-board 12MHz crystal oscillator. In addition, the MAX9850 MAX9850 EV kit can also use a user-provided signal source that is connected to J9. Alternatively, the S/PDIF recovered clock can be used. The MAX9850 MAX9850 ev kit software controls which clock signal is routed to the MCLK input (see the Clock Setup section for more details). _ MAX9850 MAX9850 Evaluation System/Evaluation Kit Evaluate: MAX9850 MAX9850 Figure 13. The above example shows a simple SMBusWriteByte operation using the included Two-Wire Interface Diagnostics. In this example, the software is writing data (0x00h) to Device Address 0x20h, Register Address 0x02h. The above data sequence will set the volume of the MAX9850 MAX9850 to max. Address Selection Manual Headphone Sense Control Jumper JU1 sets the MAX9850 MAX9850 I2C slave address. The default address is 0010 000Y (ADD = GND). See Table 1 for a complete list of addresses. Note: The first 7 bits shown are the address. Y (bit 0) is the I2C read/write bit. This bit is a 1 for a read operation or a 0 for a write. To simulate a pair of headphones being inserted into the headphone jack J8, remove the shunt from jumper JU2. Connect the load to the LEFT, RIGHT, and GND pads located by the headphone jack J8. See Table 2 for jumper settings. _ 13 Evaluate: MAX9850 MAX9850 MAX9850 MAX9850 Evaluation System/Evaluation Kit Table 1. JU1 Shunts Settings for I2C Address (JU1) SHUNT POSITION MAX9850 MAX9850 ADDRESS PIN BINARY HEXADECIMAL 1-2* GND 0010 000Y 0x20h 3-4 AVDD 0010 001Y 0x22h 5-6 SDA 0010 011Y 0x26h If the on-board digital receiver IC is to be used with an alternative I2C interface, connect a 3.3V power supply between the VMOD and GND pads on the MAX9850 MAX9850 EV kit. The I2C address of the digital receiver is fixed at 0x28. MAX9850 MAX9850 ADDRESS *Default Configuration: JU1 (1-2) Table 2. Manual Headphones Sense Control (JU2) SHUNT POSITION Using an Alternative Digital Audio Interface The MAX9850 MAX9850 EV kit features a digital receiver that converts readily available S/PDIF signals to the required digital audio signals needed for the MAX9850 MAX9850. If an alternative digital audio interface is to be used, connect the interface to header J10, check Disconnect Receiver. Header pin names are clearly marked on the EV kit silkscreen. Ensure that the command module is disconnected from the EV kit during this mode of operation. Synchronizing the EV Kit (Master Modes) DESCRIPTION Installed* MAX9850 MAX9850 EVKIT headphone sense controlled by the insertion of headphones. Not Installed MAX9850 MAX9850 EVKIT headphone sense switch forced open. *Default Configuration: JU2 (Installed) While in master mode, the MAX9850 MAX9850 supplies the LRCLK signal and thus controls the digital audio sample rate. To allow synchronization between the MAX9850 MAX9850 and the S/PDIF sample source, the LRCLK signal is buffered and output to a set of pads on the EV kit. Connect the synchronization input of the S/PDIF sample source to the LRCLK and GND pads (Figure 14). The LRCLK signal is 3.3V CMOS compatible. Table 3. GPIO Pullup Register (JU3) SHUNT POSITION DESCRIPTION 1-2* GPIO pin pulled up to 3.3V. Monitor GPIO signal at the GPIO pad. 2-3 GPIO pin left open. Connect a pullup resistor to the desired voltage. Monitor GPIO signal at the GPIO_OPEN pad. S/PDIF SIGNAL SOURCE LRCLK IN S/PDIF OUTPUT *Default Configuration: JU3 (1-2) GND LRCLK GPIO Interface The MAX9850 MAX9850 EV kit features an on-board pullup resistor on the MAX9850 MAX9850 GPIO pin. Jumper JU3 can disconnect this pin from the pullup resistor. MAX9850 MAX9850 OPTICAL J8 Using an Alternative I2C Interface The MAX9850 MAX9850 EV kit provides pads and pullup resistor placeholders that allow an alternative I2C-compatible interface to be used. Connect the interface through the SCL, SDA, and GND pads. Install pullup resistors at positions R7 and R8, if required. 14 ELECTRICAL OPTIONAL Figure 14. Synchronized MAX9850 MAX9850 EV Kit Diagram _ MAX9850 MAX9850 Evaluation System/Evaluation Kit Evaluate: MAX9850 MAX9850 Figure 15a. MAX9850 MAX9850 EV Kit Schematic (Sheet 1 of 2) _ 15 Evaluate: MAX9850 MAX9850 MAX9850 MAX9850 Evaluation System/Evaluation Kit Figure 15b. MAX9850 MAX9850 EV Kit Schematic (Sheet 2 of 2) 16 _ MAX9850 MAX9850 Evaluation System/Evaluation Kit Evaluate: MAX9850 MAX9850 Figure 16. MAX9850 MAX9850 EV Kit Component Placement Guide-Component Side _ 17 Evaluate: MAX9850 MAX9850 MAX9850 MAX9850 Evaluation System/Evaluation Kit Figure 17. MAX9850 MAX9850 EV Kit PCB Layout-Component Side 18 _ MAX9850 MAX9850 Evaluation System/Evaluation Kit Evaluate: MAX9850 MAX9850 Figure 18. MAX9850 MAX9850 EV Kit PCB Layout-Inner Layer 2 _ 19 Evaluate: MAX9850 MAX9850 MAX9850 MAX9850 Evaluation System/Evaluation Kit Figure 19. MAX9850 MAX9850 EV Kit PCB Layout-Inner Layer 3 20 _ MAX9850 MAX9850 Evaluation System/Evaluation Kit Evaluate: MAX9850 MAX9850 Figure 20. MAX9850 MAX9850 EV Kit PCB Layout-Solder Side _ 21 Evaluate: MAX9850 MAX9850 MAX9850 MAX9850 Evaluation System/Evaluation Kit Figure 21. MAX9850 MAX9850 EV Kit Component Placement Guide-Solder Side 22 _ MAX9850 MAX9850 Evaluation System/Evaluation Kit REVISION NUMBER REVISION DATE 3 3/09 DESCRIPTION Updated Component List and Figures 15a­21. PAGES CHANGED 1, 2, 3, 15­21 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 _ 23 © 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc. Evaluate: MAX9850 MAX9850 Revision History