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 sur- face-mount circuit board that evaluates the max9765 750mw stereo audio power amplifier plus headphone dri- ver and microphone amplifier. the ev kit is designed to be driven by any stereo audio source such as a cd play- er. the max9765 ev kit includes rca jacks and a 3.5mm microphone jack on the inputs as well as a 3.5mm head- phone 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 ibm- compatible pc to use its parallel port to emulate an smbus/i 2 c -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. 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. features 2.7v to 5.5v single-supply operation 750mw stereo bridge-tied-load (btl) amplifier 95db power-supply rejection ratio smbus/i 2 c-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 evaluates: max9765 max9765 evaluation system/evaluation kit ________________________________________________________________ maxim integrated products 1 designation qty description c1 c4 4 0.68f 10%, 20v tantalum capacitors (r-case) avx tajr684k020 c5, c6 2 100pf 5%, 50v c0g ceramic capacitors (0402) tdk c1005c0g1h101j c8, c9, c10, c14, c15 5 1.0f 20%, 10v x7r ceramic capacitors (0603) tdk c1608x7r1a105m c11, c12, c13 3 220f 20%, 10v tantalum capacitors (y-case) avx tpsy227m010r0200 sprague 592d227x0010v2t ordering information 19-2832; rev 0; 4/03 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part temp range ic package smbus interface type max9765evkit 0 c to +70 c 32 thin qfn not included max9765evsys 0 c to +70 c 32 thin qfn maxsmbus 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. smbus is a trademark of intel corp. windows is a registered trademark of microsoft corp. i 2 c is a trademark of philips corp. purchase of i 2 c components of maxim integrated products, inc., or one of its sublicensed associated companies, conveys a license under the philips i 2 c patent rights to use these components in an i 2 c system, provid- ed that the system conforms to the i 2 c standard specification as defined by philips. designation qty description c16 1 1.0f 10%, 10v tantalum capacitor (r-case) avx tajr105k010 c17, c18 2 100f 10%, 6.3v tantalum capacitors (w-case) avx tajw107k006 r1 r6 6 15k ? 1% resistors (0402) r7, r8, r9 3 10k ? 5% resistors (0402) r11 r14 4 100k ? 5% resistors (0402) r15 1 680k ? 5% resistor (0402) r16, r17 0 not installed (0402) r18 1 2k ? 1% resistor (0402) component list
evaluates: max9765 quick start recommended equipment 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 com- puter 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 (16 ? or greater) two stereo audio sources (to demonstrate the input mux feature) one pair of speakers (4 ? or greater) two microphones (to demonstrate the mic amp fea- tures) max9765 evaluation system/evaluation kit 2 _______________________________________________________________________________________ supplier phone fax website avx 843-946-0238 843-626-3123 www.avxcorp.com sprague 402-563-6866 402-563-6296 www.vishay.com tdk 847-803-6100 847-390-4405 www.component.tdk.com component suppliers designation qty description r19 0 not installed (0402) r20 1 47k ? 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) ju1 1 2-pin header 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) none 3 shunts none 1 max9765 pc board none 1 software disk (cd-rom), max9765 evaluation kit component list (continued) max9765evkit input-l1 input-l2 hps se/btl mic bias mic bias i 2 c compatible input-r1 input-r2 micin+ micin- aux in left right micout smbus/i 2 c- compatible interface single supply 2.7v to 5.5v functional diagram note: please indicate that you are using the max9765 when contacting these component suppliers.
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. 2) connect a cable from the computer's parallel port to the smbus interface board. use a straight- through 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 connec- tor 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 sin- gle-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 pro- gram. 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 pro- grammable 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 cor- rect i 2 c/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 micro- phone. 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 micro- phone amplifier gain through the 2-wire interface. the microphone amplifier gain can be adjusted by the gain slider in the microphone control box. evaluates: max9765 max9765 evaluation system/evaluation kit _______________________________________________________________________________________ 3
evaluates: max9765 speaker/headphone control 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 dis- abled 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 4 _______________________________________________________________________________________ figure 1. max9765 ev kit software main window 3.5mm mic socket sleeve ring tip ring?icbias (2.5v through r18) tip?nput to aux sleeve?v figure 2. notebook pc microphone connection diagram
phones (if both are present). selecting the headphone mode (single-ended) provides drive to the head- phones only. max9765 status the program continually polls the device for new status data and updates the max9765 status window. to dis- able 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 i 2 c 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 8- bit 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. evaluates: max9765 max9765 evaluation system/evaluation kit _______________________________________________________________________________________ 5 figure 3. simple smbuswritebyte operation using the included 2-wire interface diagnostics. (in this example, the software is wr iting data (0x18) to device address 0x92, register address 0x01. the above data sequence mutes both max9765 output channels.)
evaluates: max9765 detailed description of hardware the max9765 ev kit is a stereo, single-supply speak- er/headphone/microphone amplifier. the max9765 ev kit is designed to be driven by any stereo audio source. the input impedance is 15k ? . 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 connec- tions 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 i 2 c/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 oper- ation and a zero for a write. hardware shutdown control jumper ju2 controls the hardware shutdown function of the max9765 ev kit. this shuts down the max9765 i 2 c/smbus interface and resets all the registers to their power-on defaults (see table 2 for shutdown shunt positions). 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 head- phone jack j5 (see table 3 for jumper settings). using the max9765 ev kit with an smbus interface a user-supplied i 2 c/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 1k ? 5% resistors in locations r16 and r17. max9765 evaluation system/evaluation kit 6 _______________________________________________________________________________________ max9765 address jumper shunt position max9765 addres s pin binary hexadecimal ju3 1 2* v dd 1001 001y 0x92h ju3 3 4 scl 1001 011y 0x96h ju3 5 6 sda 1001 010y 0x94h ju3 7 8 sgnd 1001 000y 0x90h table 1. shunt settings for smbus address jumper shunt position description ju2 1 2* max9765 enabled ju2 2 3 max9765 shut down table 2. shutdown selection jumper shunt position description ju1 installed* max9765 ev kit headphone sense controlled by the insertion of headphones ju1 not installed max9765 ev kit headphone sense switch forced open table 3. manual headphone sense control * default configuration * default configuration * default configuration
evaluates: max9765 max9765 evaluation system/evaluation kit _______________________________________________________________________________________ 7 n.c. 2 n.c. 7 n.c. 18 scl scl 25 sda 24 inl1 9 1 vdd r17 open sda vdd vdd r16 open r9 10k ? 1 2 3 ju2 shdn j1 sgnd 1 2 r1 15k ? 1% c1 0.68 f 20v inr1 28 j2 sgnd 1 2 r2 15k ? 1% c2 0.68 f 20v inl2 8 j3 sgnd vdd add 1 2 r3 15k ? 1% c3 0.68 f 20v inr2 27 add 23 sv dd 14 bias 31 j4 sgnd 1 2 r4 15k ? 1% c4 0.68 f 20v add 4 2 sda 6 add 8 ju3 3 1 5 7 scl add sgnd sgnd sgnd c9 1.0 f c13 220 f 10v gnd sgnd 26 mgnd gnd sgnd 29 lpgnd pgnd 5 6 rpgnd pgnd outl- 3 outl+ 32 gainl 30 hps 20 dgnd tb1 1 tb1 2 r5 15k ? 1% left speaker lpgnd sgnd r7 10k ? c11 220 f 10v c5 100pf 19 22 outr+ 17 gainr 16 micout 11 micin- 12 auxin 15 micbias tb2 1 tb2 2 r6 15k ? 1% right speaker rpgnd r8 10k ? c12 220 f 10v c6 100pf outr- vdd r15 680k ? r20 47k ? r13 100k ? r11 100k ? mgnd micin- mgnd mgnd mgnd c15 1.0 f 10 micin+ r12 100k ? mgnd micin+ mgnd c14 1.0 f c10 1.0 f c16 1.0 f 10v r14 100k ? mgnd 1 2 out micout j7 left gnd j5 right 4 3 2 1 ju1 auxin micbias bias j8 4 2 1 r18 2k ? 1% r19 open vdd c8 1.0 f 13 v dd vdd 21 pv dd 4 pv dd c17 100 f 6.3v rpgnd dgnd c18 100 f 6.3v lpgnd max9765 u1 gnd vdd vdd sgnd j6-3 j6-11 j6-1 j6-13 j6-15 j6-17 j6-9 j6-20 j6-5 j6-2 j6-4 j6-6 j6-8 j6-10 j6-12 j6-14 j6-16 j6-18 j6-19 sda j6-7 scl dgnd j6 figure 4. max9765 ev kit schematic
evaluates: max9765 max9765 evaluation system/evaluation kit 8 _______________________________________________________________________________________ figure 5. max9765 ev kit component placement guide?omponent side figure 6. max9765 ev kit pc board layout?omponent side
evaluates: max9765 max9765 evaluation system/evaluation kit _______________________________________________________________________________________ 9 figure 7. max9765 ev kit pc board layout?nner layer 2 figure 8. max9765 ev kit pc board layout?nner layer 3
evaluates: max9765 max9765 evaluation system/evaluation kit maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it 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. figure 9. max9765 ev kit pc board layout?older side
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