Evaluates: MAX97220AMAX97220D 19-5662 Rev 0 12/10 MAX97220A Evaluation Kit General Description Features The MAX97220A evaluation kit (EV kit) is a fully assembled S 2.5V to 5.5V Single-Supply Operation and tested circuit board that evaluates the MAX97220A S 3V Output Drive Into 600 Load RMS differential input DirectDrive line driver/headphone S 125mW Headphone Amplifier amplifier. The device is capable of driving 125mW into S Fully Differential Inputs 32I, or 3V into 600I load, with a 5V supply. RMS S Externally Adjustable Gain The EV kit provides an externally set gain, is powered from a 2.5V to 5.5V single power supply, S Low-Power Shutdown Input and includes a shutdown input. The EV kit also evalu- S Evaluates the MAX97220B, MAX97220C, and ates the MAX97220B, MAX97220C, and MAX97220D MAX97220D (with IC Replacement) devices. Request a free MAX97220B, MAX97220C, and/ S Fully Assembled and Tested or MAX97220D IC sample from the factory when ordering the EV kit. Ordering Information PART TYPE MAX97220AEVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION Not installed, ceramic capacitors 0.1FF Q10%, 25V X7R ceramic C11C16 0 (0603) 3 capacitors (0603) C1, C2, C7 Murata GRM188R71E104K HP OUT 1 3.5mm stereo headphone jack TDK C1608X7R1E104K JU1 1 2-pin header OUTL, OUTR, 0.47FF Q10%, 25V X7R ceramic 3 Test points GND capacitors (0603) C3C6 4 Murata GRM188R71E474K OUTL 1 White headphone jack TDK C1608X5R1E474K OUTR 1 Red headphone jack R1R8 8 10kI Q1% resistors (0603) 1FF Q10%, 10V X7R ceramic R9 1 100kI Q5% resistor (0603) capacitors (0603) C8, C9 2 Murata GRM188R71C105K Differential input headphone TDK C1608X7R1C105K U1 1 amplifier (16 TQFN) Maxim MAX97220AETE+ 10FF Q20%, 6.3V X5R ceramic 1 Shunts capacitor (0603) C10 1 Murata GRM188R60J106M PCB MAX97220A EVALUATION 1 TDK C1608X5R0J106M 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 MAX97220 when contacting these component suppliers. DirectDrive is a registered trademark of Maxim Integrated Products, Inc. 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.MAX97220A Evaluation Kit 9) Connect the right output of the audio source to the Quick Start INR- pad. Recommended Equipment 10) Connect the ground of the audio source to the INR+ MAX97220A EV kit pad. 2.5V to 5.5V DC supply 11) Enable the stereo audio source. Stereo audio signal source 12) Enable the power-supply output. Pair of stereo headphones 13) Verify that the headphones are playing the audio Procedure source signal. The EV kit is fully assembled and tested. Follow the Detailed Description steps below to verify board operation. Caution: Do not turn on the power supply until all connections are The MAX97220A EV kit features the MAX97220A differen- completed. tial stereo headphone driver with DirectDrive, designed to directly drive a 125mW into a 32I stereo headphone. 1) Verify that a shunt is installed across jumper JU1 The EV kit operates from a DC power supply that can (device enabled). provide 2.5V to 5.5V and accepts two sets of differential 2) Set the power-supply output to 5V. audio inputs. 3) Disable the power-supply output. Headphone Amplifier Shutdown 4) Connect the power-supply ground to the GND pad Jumper JU1 enables or disables the headphone ampli- and the power-supply positive output to the VDD fier. See Table 1 for jumper JU1 configuration. pad on the EV kit. MAX97220C/MAX97220D Usage 5) Connect headphones to the stereo headphone jack When replacing the MAX97220A with either the (HP OUT) provided on the EV kit. MAX97220C or MAX97220D, several external compo- 6) Verify that the audio source output is disabled. nents must be changed. R1R4 should be replaced with 7) Connect the left output of the audio source to the 0 resistors. R5R8 should be removed from the PCB. INL- pad. C11C16 should be left uninstalled (same as the default EV kit setting). 8) Connect the ground of the audio source to the INL+ pad. Table 1. Shutdown Input (JU1) SHUNT POSITION AMPLIFIER SHDN PIN Installed* Connected to VDD Enabled Connected to GND Not installed Disabled through R9 *Default position. 2 Evaluates: MAX97220AMAX97220D