19-2832; Rev 0; 4/03 MAX9765 Evaluation System/Evaluation Kit The MAX9765EVSYS includes both the MAX9765 EV kit and the MAXSMBus interface board. Order only the MAX9765EVKIT if you already have an SMBus interface board. SMBus is a trademark of Intel Corp. Windows is a registered trademark of Microsoft Corp. I2C is a trademark of Philips Corp. Purchase of I2C components of Maxim Integrated Products, Inc., or one of its sublicensed Associated Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. DESIGNATION QTY DESCRIPTION C1–C4 4 0.68µF ±10%, 20V tantalum capacitors (R-case) AVX TAJR684K020 C5, C6 2 C8, C9, C10, C14, C15 C11, C12, C13 Features ♦ 2.7V to 5.5V Single-Supply Operation ♦ 750mW Stereo Bridge-Tied-Load (BTL) Amplifier ♦ 95dB Power-Supply Rejection Ratio ♦ SMBus/I2C-Compatible 2-Wire Serial Interface ♦ 2:1 Stereo Input Mux ♦ Low-Profile (2.0mm, max) Design ♦ No Detectable Clicks or Pops ♦ Easy-to-Use, Menu-Driven Software ♦ Assembled and Tested ♦ Software-Controlled Mute, Input MUX, and Mic Gain ♦ Automatic Headphone Sensing Circuitry ♦ Includes Windows 98/2000/XP-Compatible Software and Demo PC Board Ordering Information TEMP RANGE PART IC PACKAGE SMBus INTERFACE TYPE 0°C to +70°C 32 Thin QFN Not included MAX9765EVSYS 0°C to +70°C 32 Thin QFN MAXSMBUS MAX9765EVKIT Note: The MAX9765 EV kit software is provided with the MAX9765EVKIT. However, the MAXSMBUS board is required to interface the EV kit to the computer when using the software. Component List DESIGNATION QTY DESCRIPTION C16 1 1.0µF ±10%, 10V tantalum capacitor (R-case) AVX TAJR105K010 100pF ±5%, 50V C0G ceramic capacitors (0402) TDK C1005C0G1H101J C17, C18 2 100µF ±10%, 6.3V tantalum capacitors (W-case) AVX TAJW107K006 1.0µF ±20%, 10V X7R ceramic capacitors (0603) TDK C1608X7R1A105M R1–R6 6 15kΩ ±1% resistors (0402) 5 R7, R8, R9 3 10kΩ ±5% resistors (0402) R11–R14 4 100kΩ ±5% resistors (0402) R15 1 680kΩ ±5% resistor (0402) 3 220µF ±20%, 10V tantalum capacitors (Y-case) AVX TPSY227M010R0200 Sprague 592D227X0010V2T R16, R17 0 Not installed (0402) R18 1 2kΩ ±1% resistor (0402) ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 Evaluates: MAX9765 General Description The MAX9765 evaluation system (EV system) consists of a MAX9765 evaluation kit (EV kit) and a companion Maxim System Management Bus (SMBus™) interface board. The MAX9765 EV kit is a fully assembled and tested surface-mount circuit board that evaluates the MAX9765 750mW stereo audio power amplifier plus headphone driver and microphone amplifier. The EV kit is designed to be driven by any stereo audio source such as a CD player. The MAX9765 EV kit includes RCA jacks and a 3.5mm microphone jack on the inputs as well as a 3.5mm headphone jack and terminal blocks on the output to facilitate easy connections to the circuit board. The MAX9765 EV kit includes Windows®98/2000/XP-compatible software, which provides a user interface for exercising the MAX9765 features. The MAXSMBus interface board allows an IBMcompatible PC to use its parallel port to emulate an SMBus/I2C™-compatible 2-wire interface. Windows 98/ 2000/XP-compatible software provides a user-friendly interface to exercise the MAX9765 features. The program is menu driven and offers a graphic interface with control buttons and status display. Evaluates: MAX9765 MAX9765 Evaluation System/Evaluation Kit Component List (continued) DESIGNATION QTY Functional Diagram DESCRIPTION R19 0 Not installed (0402) SINGLE SUPPLY 2.7V TO 5.5V R20 1 47kΩ ±5% resistor (0402) J1, J3 2 Phono jacks (white) J2, J4 2 Phono jacks (red) J5 1 Switched stereo headphone jack (3.5mm dia) J6 1 2 ✕ 10 right-angle female receptacle J7 1 Phono jack (black) J8 1 Nonswitched stereo headphone jack (3.5mm dia) INPUT-R1 JU1 1 2-pin header INPUT-R2 JU2 1 3-pin header JU3 1 Jumper (2 ✕ 4 pin header) TB1, TB2 2 2-circuit terminal blocks U1 1 MAX9765ETJ (32-pin thin QFN) MICIN+ None 3 Shunts MICIN- None 1 MAX9765 PC board None 1 Software disk (CD-ROM), MAX9765 Evaluation Kit INPUT-L1 INPUT-L2 LEFT HPS SE/BTL RIGHT MICOUT AUX IN I2C COMPATIBLE Quick Start MIC BIAS SMBus/I2CCOMPATIBLE INTERFACE MIC BIAS Recommended Equipment MAX9765EVKIT • Computer running Windows 98, 2000, or XP • Parallel printer port (this is a 25-pin socket on the back of the computer) • Standard 25-pin, straight-through, female-to-male cable (printer extension cable) to connect the computer’s parallel port to the Maxim SMBus interface board • A fixed 9V, 100mA DC power supply (for SMBus card) • DC power supply capable of supplying any voltage between 2.7V and 5.5V at 1A • One pair of headphones (16Ω or greater) • Two stereo audio sources (to demonstrate the input mux feature) • One pair of speakers (4Ω or greater) • Two microphones (to demonstrate the mic amp features) Component Suppliers PHONE FAX AVX SUPPLIER 843-946-0238 843-626-3123 www.avxcorp.com WEBSITE Sprague 402-563-6866 402-563-6296 www.vishay.com TDK 847-803-6100 847-390-4405 www.component.tdk.com Note: Please indicate that you are using the MAX9765 when contacting these component suppliers. 2 _______________________________________________________________________________________ MAX9765 Evaluation System/Evaluation Kit 2) Connect a cable from the computer's parallel port to the SMBus interface board. Use a straightthrough 25-pin female-to-male cable. To avoid damaging the MAX9765 EV kit or your computer, do not use a 25-pin SCSI port or any other connector that is physically similar to the 25-pin parallel printer port. 3) The MAX9765.EXE software program can be run from the CD-ROM or the hard drive. Use the Windows program manager to run the program. If desired, you may use the INSTALL.EXE program to copy the files and create icons in the Windows 98/2000/XP Start menu. Do not turn on the power until all connections are made. 4) Connect the 9V power supply to the pads labeled POS9 and GND1 of the SMBus interface board. 5) Connect the 2.7V to 5.5V power supply to the pads labeled VDD and GND on the MAX9765 EV kit board. 6) Adjust the 2.7V to 5.5V power supply to 3.0V. 7) Ensure that both stereo audio sources are turned off. 8) Connect the first stereo audio source to the input jacks labeled J1 and J2. 9) Connect the second stereo audio source to the input jacks labeled J3 and J4. 10) Plug the headphones into the 3.5mm headphone jack labeled J5. 11) Connect the speakers to the terminal blocks labeled TB1 and TB2. 12) Connect a differential microphone to the pads marked MICIN+ and MICIN-, and/or connect a single-ended microphone to the 3.5mm jack labeled J8. 13) Ensure that a shunt is installed on jumper JU1. 14) Ensure that shunts are installed across pins 1 and 2 of jumpers JU2 and JU3. 15) Turn on the DC power supplies. 16) Enable the stereo audio sources. 17) Start the MAX9765 program by opening its icon in the Start menu. 18) Observe as the program automatically detects the address of the MAX9765 and starts the main program. 19) The MAX9765 features can be controlled by using the provided software. The Detailed Description of Software section outlines how to use these functions. Detailed Description of Software User-Interface Panel The MAX9765 EV kit software provides an easy user interface (Figure 1) to control and read back the programmable features of this device. Each of the buttons and control sliders correspond to bits in the command and configuration bytes. By clicking on them, the correct I2C/SMBus write operation is generated to update the internal registers of the MAX9765. The Interface box indicates the current Device Address, the Register Address, and the Data Sent/Received for the last read/write operation. This data is used to confirm proper device operation. Note: Words in boldface are user-selectable features in the software. Signal Input Selection The MAX9765 EV kit can route one of two independent stereo signals to the speakers or headphones. The input signal is selected by choosing the desired option in the Signal Input Selection box. Choosing Signal Input #1 routes the signal from input jacks J1 and J2. Choosing Signal Input #2 routes the signal from input jacks J3 and J4. Microphone Control The MAX9765 EV kit is capable of amplifying both a single-ended microphone and a differential microphone. Selecting the Differential Mode (internal) option located in the Microphone Input Selection box evaluates a differential microphone connected to the MICIN+ and MICIN- pads. Selecting the Single-Ended Mode (external) option evaluates a single-ended microphone connected to the AUXIN and MICBIAS pads or through microphone jack J8. Microphone jack J8 conforms to a standard notebook PC (Figure 2). The MAX9765 EV kit software also controls the microphone amplifier gain through the 2-wire interface. The microphone amplifier gain can be adjusted by the Gain slider in the Microphone Control box. _______________________________________________________________________________________ 3 Evaluates: MAX9765 Procedure The MAX9765 EV kit is fully assembled and tested. Follow the steps below to verify board operation. Do not turn on the power supply until all connections are completed: 1) Carefully connect the boards by aligning the 20-pin connector of the MAX9765 EV kit with the 20-pin header of the MAXSMBUS interface board. Gently press them together. Evaluates: MAX9765 MAX9765 Evaluation System/Evaluation Kit Figure 1. MAX9765 EV Kit Software Main Window Speaker/Headphone Control RING SLEEVE TIP 3.5mm MIC SOCKET RING—MICBIAS (2.5V THROUGH R18) TIP—INPUT TO AUX SLEEVE—0V Figure 2. Notebook PC Microphone Connection Diagram 4 Selecting the desired option in the Speaker/ Headphone Control box allows the MAX9765 EV kit to operate in one of three independent modes. The Automatic mode (default) detects the insertion of the headphones in jack J5. The speaker outputs are disabled if the headphones are present, and enabled if the headphones are absent. Selecting the Speaker Mode (BTL) provides drive to the speakers and head- _______________________________________________________________________________________ MAX9765 Evaluation System/Evaluation Kit MAX9765 Status The program continually polls the device for new status data and updates the MAX9765 status window. To disable continuous polling of data, uncheck the Automatic Read checkbox. Software Mute and Shutdown Control Selecting the desired option in the Mute and Shutdown Control box allows the MAX9765 EV kit to disable the left, right, or both output channels. Checking the Mute Left option mutes the left channel. Checking the Mute Right option mutes the right channel. Checking the Mute Left+Right option mutes both channels. Checking the Shutdown all Audio Circuitry places the MAX9765 into a low-power software shutdown mode. In this mode, all the I2C registers are still active. Simple SMBus Commands There are two methods for communicating with the MAX9765: through the normal user-interface panel or through the SMBus commands available by selecting the Two Wire Interface Diagnostics item from the Interface pulldown menu. A display pops up that allows the SMBus protocols, such as Read Byte and Write Byte, to be executed. To stop normal user-interface execution so that it does not override the manually set values, turn off the update timer by unchecking the Automatic Read checkbox. The SMBus 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 3 for an example of this tool. Note: In places where the slave address asks for an 8bit value, it must be the 7-bit slave address of the MAX9765 as determined by the ADD pin with the last bit set to 1 for a read operation and zero for a write. Refer to the MAX9765 data sheet for a complete list of registers and functions. Figure 3. Simple SMBusWriteByte Operation Using the Included 2-Wire Interface Diagnostics. (In this example, the software is writing data (0x18) to Device Address 0x92, Register Address 0x01. The above data sequence mutes both MAX9765 output channels.) _______________________________________________________________________________________ 5 Evaluates: MAX9765 phones (if both are present). Selecting the Headphone Mode (Single-Ended) provides drive to the headphones only. Evaluates: MAX9765 MAX9765 Evaluation System/Evaluation Kit Detailed Description of Hardware The MAX9765 EV kit is a stereo, single-supply speaker/headphone/microphone amplifier. The MAX9765 EV kit is designed to be driven by any stereo audio source. The input impedance is 15kΩ. The MAX9765 EV kit is shipped with components selected to produce a unity gain and can be powered with a 2.7V to 5.5V supply. A bandpass filter is implemented on the MAX9765 EV kit. The -3dB corner frequencies are approximately 16Hz and 106kHz and are dependent on components R1–R6, C1–C6. Multiple input and output jacks facilitate easy connections to the board. Connect the speakers to terminal blocks TB1 and TB2. Connect the two stereo input sources through jacks J1–J4. Connect the headphones through J5. Connect the microphone to the MICIN+/MICIN- pads or through the input jack (J8). The amplified microphone output appears on the pad labeled OUT or on J7. MAX9765 Address Selection There are four possible I2C/SMBus addresses (refer to the MAX9765 data sheet for details). Jumper JU1 sets the MAX9765 slave address. The default address is 1001 001Y (ADD = VCC). See Table 1 for a complete list of addresses. Note: The first 7 bits shown are the address. Y (bit 0) is the SMBus read/write bit. This bit is a 1 for a read operation and a zero for a write. Table 1. Shunt Settings for SMBus Address JUMPER MAX9765 MAX9765 ADDRESS SHUNT ADDRESS POSITION BINARY HEXADECIMAL PIN JU3 1–2* VDD 1001 001Y 0x92h JU3 3–4 SCL 1001 011Y 0x96h JU3 5–6 SDA 1001 010Y 0x94h JU3 7–8 SGND 1001 000Y 0x90h *Default configuration Table 2. Shutdown Selection JUMPER SHUNT POSITION JU2 1–2* MAX9765 enabled DESCRIPTION JU2 2–3 MAX9765 shut down *Default configuration Table 3. Manual Headphone Sense Control JUMPER SHUNT POSITION Hardware Shutdown Control JU1 Installed* Jumper JU2 controls the hardware shutdown function of the MAX9765 EV kit. This shuts down the MAX9765 I2C/SMBus interface and resets all the registers to their power-on defaults (see Table 2 for shutdown shunt positions). MAX9765 EV kit headphone sense controlled by the insertion of headphones JU1 Not installed MAX9765 EV kit headphone sense switch forced open Manual Headphone Sense Control Removing the shunt from jumper JU1 simulates a pair of headphones being inserted into the headphone jack by forcing the HPS pin to a logic high. Connect the load to the LEFT, RIGHT, and GND pads located by headphone jack J5 (see Table 3 for jumper settings). 6 DESCRIPTION *Default configuration Using the MAX9765 EV Kit with an SMBus Interface A user-supplied I2C/SMBus interface may be used with the MAX9765 EV kit. If the interface does not have pullup resistors on the clock or data lines, additional pads are provided on the EV kit for this purpose. To ensure that the clock and data lines are pulled up to the correct voltage levels, solder 1kΩ ±5% resistors in locations R16 and R17. _______________________________________________________________________________________ J6-15 J6-17 J6-8 J6-10 DGND J6-13 J6-6 J6-19 J6-18 J6-16 J6-14 J4 J6-20 J6-9 J6-11 J6-4 J6-12 J6-7 J6-3 J6-2 J6-5 J6-1 ADD SDA ADD SGND 2 1 J3 J2 2 1 VDD SGND JU2 2 1 2 1 SGND ADD C4 0.68µF 20V C2 0.68µF 20V SCL ADD C13 220µF 10V R4 15kΩ 1% SGND R3 15kΩ 1% C9 1.0µF R2 15kΩ 1% R1 15kΩ 1% R17 OPEN VDD SGND 31 14 23 27 8 28 9 1 24 25 18 7 2 C17 100µF 6.3V LPGND RPGND SCL C18 100µF 6.3V C1 0.68µF 20V VDD C3 0.68µF 20V R16 OPEN SGND SDA J1 1 JU3 2 3 4 5 6 7 8 SGND DGND 3 2 1 R9 10kΩ VDD SCL SDA SGND GND 26 BIAS SVDD ADD INR2 INL2 INR1 INL1 SHDN SDA SCL N.C. N.C. N.C. U1 21 PVDD PGND PGND 5 20 OUTL- OUTL+ GAINL HPS OUTR- OUTR+ GAINR MICOUT MICIN- MICIN+ AUXIN MICBIAS 13 VDD VDD 6 3 32 30 19 22 17 16 11 10 12 15 VDD C8 1.0µF C5 100pF R20 47kΩ R15 680kΩ C6 100pF C15 1.0µF C14 1.0µF BIAS LEFT SPEAKER TB1–1 TB1–2 R5 15kΩ 1% RIGHT SPEAKER C11 220µF 10V R8 10kΩ MGND AUXIN MGND C12 220µF 10V MGND MGND R11 100kΩ TB2–1 TB2–2 R6 15kΩ 1% R13 100kΩ R12 100kΩ R18 2kΩ 1% R19 OPEN C10 1.0µF SGND LPGND RPGND DGND MGND GND 29 MAX9765 4 PVDD VDD C16 1.0µF 10V MGND RPGND 1 4 2 MICBIAS R7 10kΩ R14 100kΩ VDD 1 MGND 2 LPGND JU1 MICIN- MICIN+ MGND J8 J7 LEFT OUT MICOUT SGND GND VDD SGND 4 3 2 1 GND RIGHT J5 Evaluates: MAX9765 J6 MAX9765 Evaluation System/Evaluation Kit Figure 4. MAX9765 EV Kit Schematic _______________________________________________________________________________________ 7 Evaluates: MAX9765 MAX9765 Evaluation System/Evaluation Kit Figure 5. MAX9765 EV Kit Component Placement Guide—Component Side Figure 6. MAX9765 EV Kit PC Board Layout—Component Side 8 _______________________________________________________________________________________ MAX9765 Evaluation System/Evaluation Kit Evaluates: MAX9765 Figure 7. MAX9765 EV Kit PC Board Layout—Inner Layer 2 Figure 8. MAX9765 EV Kit PC Board Layout—Inner Layer 3 _______________________________________________________________________________________ 9 Evaluates: MAX9765 MAX9765 Evaluation System/Evaluation Kit Figure 9. MAX9765 EV Kit PC Board 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. 10 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.