general description the max4299 evaluation kit (ev kit) is a fully assembled and tested circuit board that uses the max4299 audio system ic designed for a single 5v application. the audio system ic features a stereo headphone driver, microphone amplifier, and a 3.3v linear regulator. the ev kit? headphone driver is capable of driving 1.2v rms into a 32 ? headphone. the microphone amplifi- er is capable of driving 1.5v rms into a 10k ? load. a 3.3v linear regulator is capable of supplying 100ma. features 4.5v to 5.5v single-supply operation clickless/popless power-up, power-down, mute and unmute pc99-compliant output drivers: better than 1.2v rms output into 32 ? audio load pc99-compliant microphone amplifier: better than 1.5v rms output into 10k ? load small 16-pin tssop package fully assembled and tested evaluates: max4299 max4299 evaluation kit ________________________________________________________________ maxim integrated products 1 19-2185; rev 0; 10/01 component list 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. ordering information component suppliers designation qty description c1, c10 2 10f, 6.3v x5r ceramic capacitors (1206) taiyo yuden jmk316bj106ml c2, c3, c6 3 0.33f, 10v x5r ceramic capacitors (0603) taiyo yuden lmk107bj334ka c4, c5, c12 3 1f, 6.3v x5r ceramic capacitors (0603) taiyo yuden jmk107bj105ka c7, c8, c9 3 220f, 6.3v tantalum capacitors (case c) avx tajc227k006 c11 1 0.1f, 16v x7r ceramic capacitor (0603) taiyo yuden emk107bj104ka d1 1 0.2a, 30v super-mini schottky- diode (sod-323) central semiconductor cmdsh2-3 designation qty description j1 1 right-angle phono jack (white) j2 1 right-angle phono jack (red) j3 1 right-angle phono jack (yellow) j4, j5 2 3.5mm stereo jacks r1, r4, r5, r6, r8 5 20k ? 1% resistors (0805) r2, r3 0 not installed (0805) r7 1 200k ? 1% resistor (0805) r9 1 2k ? 1% resistor (0805) r10, r11, r12 3 100k ? 5% resistors (0805) ju1 1 2-pin header ju2 1 3-pin header none 2 shunts (ju1, ju2) none 1 max4299 pc board none 1 max4299 data sheet none 1 max4299 ev kit data sheet u1 1 max4299eue, 16-pin tssop part temp range ic package MAX4299EVKIT 0 c to +70 c 16 tssop supplier phone fax avx 843-448-9411 843-448-1943 central semiconductor 631-435-1110 631-435-1824 taiyo yuden 800-348-2496 847-925-0899 note: please indicate that you are using the max4299 when contacting these component suppliers.
evaluates: max4299 max4299 evaluation kit 2 _______________________________________________________________________________________ quick start the max4299 ev kit is fully assembled and tested. follow these steps to verify board operation. do not turn on the power supply until all connections are completed. recommended equipment 5v, 1a power supply stereo headphone with 3.5mm plug microphone audio source one voltmeter avdd output 1) connect the positive lead of the voltmeter to the avdd pad, and the negative lead of the voltmeter to the gnd pad. 2) connect the 5v of the power supply to the vcc pad and the power supply ground to the pgnd pad. 3) turn on the power supply, and set the output of the power supply to 5v. 4) verify that the avdd pad is approximately 3.3v. headphone drivers 1) verify that jumper ju1 does not have a shunt installed. 2) verify that jumper ju2 has a shunt across pins 2 and 3. 3) connect an audio source to jacks j1 (left) and j3 (right). 4) connect the stereo headphone to the j5 jack. 5) turn on the audio source. microphone amplifier 1) verify that jumper ju1 does not have a shunt installed. 2) verify that jumper ju2 has a shunt across pins 2 and 3. 3) connect a microphone to the micin jack j4. 4) remove the audio source from jacks j1 and j3, and connect the micout jack (j2) to j1. 5) connect a stereo headphone to jack j5 (head- phone out). 6) speak into the microphone and detect the audio signal with the headphone (left channel only). detailed description the max4299 ev kit uses a max4299 audio system ic designed for 5v applications. the audio system ic fea- tures a stereo headphone driver, a microphone amplifi- er, and a 3.3v linear regulator. in addition, the ev kit also includes a mute function and a standby power- supply (svcc) pad for the user. the max4299 ev kit is configured to receive two audio sources (left and right). the two audio sources are cur- rent-amplified (unity-voltage gain) to drive up to 1.2v rms into a 32 ? stereo headphone. the micro- phone amplifier has voltage gain of -10v/v and is capa- ble of driving 1.5v rms into a 10k ? load. the 3.3v linear regulator is capable of supplying up to 100ma. resistors r2 and r3 may be added to adjust the output of the linear regulator between 1.2v and 4.5v. refer to the regulator section of the max4299 data sheet. jumper selection mute jumper ju1 controls the mute pin (mute) on the max4299 ic. mute is a clickless function that turns off the headphone without having to power-down the whole system. the mute function may be activated on the ev kit by installing a shunt across pins 1 and 2 of jumper ju1. the mute function may also be controlled by an external source connected to the mute pad and removing the shunt on jumper ju1. see table 1 for shunt positions. standby power supply jumper ju2 selects between an external standby power supply (svcc) or the on-board svcc. the standby power-supply pin (svcc) draws a small amount of reserve power to drive a clickless/popless power-down sequence. the reserve power for svcc can be stored in the capacitor c9. capacitor c9 is charged by vcc through schottky diode d1. the svcc pin can also be powered by an external source con- necting to the svcc pad and reconfiguring jumper ju2. (see table 2 for shunt positions.)
evaluates: max4299 max4299 evaluation kit _______________________________________________________________________________________ 3 table 1. ju1 jumper selection table 2. ju2 jumper selection jumper jumper position ev kit function installed (mute = high) mute enabled none (mute = low) mute disabled ju1 none. external source connected to mute pad. mute driven by external source. mute is active high. jumper jumper position ev kit function 1-2 svcc pin powered by external source (4.5v to 5.5v) 2-3 svcc pin powered by vcc pad through d1 ju2 none svcc is not powered. clickless/popless disabled.
evaluates: max4299 max4299 evaluation kit 4 _______________________________________________________________________________________ u1 max4299 1 7 2 d1 1 3 2 2 1 1 j1 j5 ju2 1 2 svcc 5 in1 14 v cc out1 13 out2 12 in2 avdd fb reg bias cbypass c2 0.33 f c4 1.0 f c5 1.0 f avdd vcc c1 10 f c9 220 f 16 11 6 regon pgnd gnd 15 vcc c11 0.1 f vcc c10 10 f gnd svcc r2 open r3 open r1 20k ? r9 2k ? r6 20k ? r7 200k ? r12 100k ? 5% r4 20k ? pgnd note: all resistors are 1%, unless otherwise specified. vcc 2 2 1 1 j3 avdd c3 0.33 f c8 220 f c7 220 f c6 0.33 f c12 1.0 f r5 20k ? j4 j2 9 micin 8 34 micout 2 1 r8 20k ? 3 3 2 r10 100k ? 5% vcc mute 10 mute ju1 r11 100k ? 5% figure 1. max4299 ev kit schematic
evaluates: max4299 max4299 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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 _____________________ 5 ? 2001 maxim integrated products printed usa is a registered trademark of maxim integrated products. figure 2. max4299 ev kit component placement guide component side figure 3. max4299 ev kit pc board layout?omponent side figure 4. max4299 ev kit pc board layout?older side 1.0" 1.0" 1.0"
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