________________________________________________________________ _ maxim integrated products _ _ 1 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. max98303 evaluation kit evaluates: max98303 general description the max98303 evaluation kit (ev kit) is a fully assembled and tested pcb that evaluates the max98303 stereo 3.1w class d amplifier in a 16-bump, 0.4mm pitch wafer-level package (wlp). the ev kit operates from a single 2.6v to 5.5v dc power supply and is capable of delivering 3.1w into a 4 i load. the ev kit accepts a differential or single-ended audio input and provides differential outputs for the speaker. the device outputs can be connected directly to a speaker load for filterless applications; however, a filter can be added to ease evaluation. features s 2.6v_ to_ 5.5v_ single-supply_ operation s delivers_ 3.1w_ into_ a_ 4i_ load s single-ended_ or_ differential_ audio_ input s five_ selectable_ gains s filterless_ operation s optional_ class_ d_ output_ filters_ for_ ease_ of_ evaluation s low-power_ shutdown_ input s fully_ assembled_ and_ tested ordering information 19-5599; rev 0; 10/10 + denotes lead(pb)-free and rohs compliant. component list part type MAX98303EVKIT+ ev kit designation qty description c1 1 0.1ff q 10%, 16v x7r ceramic capacitor (0402) murata grm155r71c104k tdk c1005x7r1c104k c2 1 10ff q 10%, 6.3v x7r ceramic capacitor (0805) murata grm21br70j106k tdk c2012x7r0j106k c3, c4, c17, c18 4 1ff q 10%, 25v x7r ceramic capacitors (0603) murata grm188r71e105k murata grm188r71e105m c5Cc16, c19, c20 0 not installed, capacitors (0603) fb1Cfb4 4 0i resistors (0603) foutl+, foutl-, foutr+, foutr-, gnd, vdd 6 binding posts inl 1 white phono jack (side-entry pcb mount) inr 1 red phono jack (side-entry pcb mount) ju1, ju4 2 2-pin headers designation qty description ju2 1 3-pin header ju3 1 5-pin header l1Cl4 0 not installed, inductorspcb short outl+, outl-, outr+, outr- 4 test points r1, r2 2 100ki q 5% resistors (0603) r3Cr6 0 not installed, resistors (0603) u1 1 2.6w class d amplifier (16 wlp) maxim max98303ewe+ 4 shunts (ju1Cju4) 1 pcb: max98303 evaluation kit+ optional_ components c7Cc16 10 0.22ff q 10%, 25v x7r ceramic capacitors (0603) murata grm188r71e224k tdk c1608x7r1e224k l1Cl4 4 22fh q 20%, 1a inductors toko a916cy-220m r3Cr6 4 22i q 5% resistors (0603)
max98303 evaluation kit evaluates: max98303 2 _ _ _______________________________________________________________________________________ table_ 1._ ju1_ and_ ju4_ jumper_ selection quick start recommended equipment ? max98303 ev kit ? 2.6v to 5.5v, 2a dc power supply ? stereo audio input ? two 4 i speakers procedures the 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) verify that shunts are installed as follows: ju1, ju4: installed (single-ended input) ju2: pins 1-2 (device enabled) ju3: pins 1-3 (12db gain) 2) set the power-supply output to 5v. disable the power supply. 3) connect the power-supply ground terminal to the gnd pad and the power-supply positive terminal to the vdd pad of the ev kit. 4) with the audio source disabled, connect the left channel of the audio source to the inl+ pad. 5) connect the right channel of the audio source to the inr+ pad. 6) connect the audio source ground to the gnd test pad. 7) connect the first speaker across the outl+ and outl- test points. 8) connect the second speaker across the outr+ and outr- test points. 9) enable the power-supply output. 10) enable the audio source. 11) verify that the speakers are playing the audio source signal. detailed description of hardware filterless output the max98303 ev kits filterless outputs (outl+, outl-, outr+, and outr-) can be connected directly to a speaker load without any filtering. use the outl+ and outl- test points or the outr+ and outr- test points to connect the speaker directly to the device output. filtered output audio analyzers typically cannot accept the class d amplifiers pulse-width modulated (pwm) signals at their inputs. therefore, the ev kit features optional lowpass filters at the outputs to ease evaluation. as shipped, the ev kits lowpass filter rc components are unpopulated and inductors l1Cl4 are shorted on the pcb. to use the filtered output posts (foutl+, foutl-, foutr+, and foutr-), remove the shorts on l1Cl4 and install components l1Cl4, c7Cc16, and r3Cr6 (provided separately with the ev kit). use the output posts to connect the filtered outputs to the audio analyzer. the default lowpass filters at the ev kit output are optimized for an 8 i speaker. jumper selection single-ended/differential audio inputs the ev kit features jumpers ju1 and ju4 to select between a differential or single-ended input mode. see table 1 for ju1 and ju4 configuration. component suppliers note: indicate that you are using the max98303ewe+when contacting these component suppliers. * default position. supplier phone_ website murata electronics north america, inc. 770-436-1300 www.murata-northamerica.com tdk corp. 847-803-6100 www.component.tdk.com toko america, inc. 847-297-0070 www.tokoam.com shunt_ position in_-_ pin device_ operation installed* ac-grounded single-ended input not installed ac-coupled to a user-supplied negative differential input differential input
max98303 evaluation kit evaluates: max98303 _______________________________________________________________________________________ _ _ 3 table_ 2._ ju2_ jumper_ selection_ (shdn) table_ 3._ ju3_ jumper_ selection_ (gain) * default position. * default position. shutdown input (shdn) the ev kit features 3-pin jumper ju2 to control the active-low shutdown input. drive shdn high to place the device in normal operation; drive shdn low to place the device in the low-power shutdown mode. see table 2 for shunt positions. selectable gain (gain) the ev kit features 5-pin jumper ju3 to control the devices five programmable gain settings. see table 3 for gain-control configuration. shunt_ position shdn_ pin device_ operation 1-2* connected to pvdd normal operation 2-3 connected to gnd shutdown mode shunt_ position gain_ pin maximum_ gain_ (db) 1-2 connected to pvdd through 100kt resistor r1 9 1-3* connected to pvdd 12 1-4 connected to gnd through 100kt resistor r2 15 1-5 connected to gnd 18 not installed unconnected 6
max98303 evaluation kit evaluates: max98303 4 _ _ _______________________________________________________________________________________ figure 1. max98303 ev kit schematic
max98303 evaluation kit evaluates: max98303 _______________________________________________________________________________________ _ _ 5 figure 2. max98303 ev kit component placement guide component side figure 3. max98303 ev kit pcb layoutcomponent side figure 4. max98303 ev kit pcb layoutsolder side 1.0 1.0 1.0
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. 6_ ___________________ _ ________ 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. max98303 evaluation kit evaluates: max98303 revision history revision number revision_ date description pages_ changed 0 10/10 initial release
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