Evaluates: MAX13330/MAX13331 19-4499 Rev 1 4/09 MAX13331 Evaluation Kit General Description Features The MAX13331 evaluation kit (EV kit) is a fully assem- No DC-Blocking Capacitors Required bled and tested surface-mount circuit board that evalu- 4V to 5.5V Single-Supply Operation ates the MAX13331 DirectDrive stereo headphone amplifier. DirectDrive eliminates the two large DC- Adjustable Gain (MAX13331 Only) blocking capacitors typically required between the out- 125mW Per Channel into 32 at 0.01% THD+N put of the amplifier and the headphones. The MAX13331 EV kit includes two RCA phono jacks on the Shutdown Control input and a 3.5mm headphone jack on the output to Ultra-Compact Solution facilitate easy connections to the circuit board. The MAX13331 EV kit can also evaluate the MAX13330 Low-Profile (1.2mm, max) Design IC. This requires the IC replacement of U1. Lead(Pb)-Free and RoHS Compliant Fully Assembled and Tested Surface-Mount Board Ordering Information PART TYPE MAX13331EVKIT+ EV Kit DirectDrive is a registered trademark of Maxim Integrated +Denotes lead(Pb)-free and RoHS compliant. Products, Inc. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION J1 1 3.5mm stereo headphone jack 1F 10%, 16V X7R ceramic capacitors (0603) JU1 1 2-pin header, 0.1in centers C1, C2 2 Murata GRM188R71C105K Not installed, 2-pin header, 0.1in JU2 0 TDK C1608X7R1C105K centers 1000pF 10%, 50V X7R ceramic OUTL, OUTR, 0 Not installed, miniature test points capacitors (0402) SGND C3, C4, C11 3 Murata GRM155R71H102K RCA phono jack (side-entry PCB TDK C1005X7R1H102K P1 1 mount), white 1F 10%, 10V X7R ceramic RCA phono jack (side-entry PCB capacitors (0603) P2 1 C5, C7, C8 3 mount), red Murata GRM188R71A105K R1, R2, R5 3 15k 1% resistors (0402) TDK C1608X7R1A105K R3, R4 2 22.6k 1% resistors (0402) 0.1F 10%, 16V X7R ceramic Automotive DirectDrive headphone capacitors (0402) C6, C9, C14 3 U1 1 amplifier (16 QSOP) Murata GRM155R71C104K Maxim MAX13331GEE/V+ TDK C1005X7R1C104K 1 Shunt 10F 10%, 10V X7R ceramic C10 1 capacitor (0805) 1 PCB: MAX13331 EVALUATION KIT+ Murata GRM21BR71A106K 0.01F 10%, 50V X7R ceramic C12, C13 2 capacitors (0402) Murata GRM155R71H103K 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.MAX13331 Evaluation Kit Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX13331 when contacting these component suppliers. Quick Start Detailed Description of Hardware The MAX13331 EV kit is a stereo, single-supply head- Required Equipment phone amplifier. The input impedance is 15k . The One pair of 8 to 32 headphones -3dB corner frequencies are approximately 10Hz and One variable DC power supply capable of supply- greater than 22kHz and are dependent on components ing between 4V and 5.5V at 500mA R1/C1 and R2/C2. The MAX13331 EV kit has a gain of approximately 1.5 and can be powered with a 4V to One stereo audio source 5.5V supply Procedure The EV kit provides two RCA phono jacks (P1 and P2) The MAX13331 EV kit is fully assembled and tested. to facilitate the connection of an audio source. In addi- Follow the steps below to verify board operation. tion, both outputs (OUTL and OUTR) are routed to a Caution: Do not turn on the power supply until all stereo headphone jack (J1), facilitating output monitor- connections are completed. ing. Shutdown control of OUTL and OUTR is also pro- 1) Plug the headphones into the 3.5mm headphone vided through jumper JU1. jack (J1). Shutdown Control 2) Ensure that the stereo audio source is turned off. The MAX13331 EV kit provides jumper JU1 to disable 3) Connect the disabled stereo audio source through the outputs, OUTL and OUTR (see Table 1 for shut- the RCA phono jacks (P1 and P2). down shunt positions). Both OUTL and OUTR are rout- ed to the headphone jack (J1). 4) Ensure that a shunt is installed on jumper JU1. 5) Connect the 4V to 5.5V DC power supply to the Layout Considerations VDD and PGND pads. To optimize the audio performance of the MAX13331, it is 6) Turn on the DC power supply. important to follow these layout guidelines. The MAX13331 EV kit uses two ground planes to minimize switching noise. 7) Verify that the audio source level is low. The two planes are star-connected at one point (JU2 pad). 8) Enable the stereo audio source. Capacitors C5, C6, C8, C12, C13, and C14 should be placed close to the IC. Refer to the MAX13331 IC data 9) Verify that the audio source signal is clearly heard from the headphones. sheet for additional layout considerations. The MAX13331 EV kit is a four-layer design, but it is possible to design the MAX13331 circuit on to a two- layer board. For a two-layer design, optimize the signal and power ground planes by maximizing the area and connecting each plane, as close as possible, to its respective IC pin. Table 1. Jumper JU1 Function SHUNT POSITION DESCRIPTION Installed Outputs enabled Not installed Outputs disabled 2 Evaluates: MAX13330/MAX13331