MAX98355EVKIT#

19-6407; Rev 0; 7/12 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B General Description The MAX98355 evaluation kit (EV kit) is a fully assembled and tested PCB that evaluates the MAX98355 PCM digital input Class D power amplifier. The EV kit operates from a single 2.5V to 5.5V DC power supply and is capable of delivering 3.2W into a 4I load. The device outputs can be connected directly to a speaker load for filterless applications. However, a filter can be added to ease evaluation. The MAX98355A accepts standard I2S data and the MAX98355B accepts left-justified digital audio data. Both ICs support time-division multiplexed (TDM) data. Features S 2.5V to 5.5V Single-Supply Operation S Only a Single External Component (VDD Capacitor) Required in Many Applications S I2S, Left-Justified, or TDM Input S Five Selectable Gains (3db, 6dB, 9dB, 12dB, and 15dB) S No MCLK Required S Sample Rates of 8kHz to 96kHz S Audio Channel Select (Left, Right, or (Left + Right)/2) S Filterless Class D Outputs S Optional Class D Output Filters for Ease of Evaluation S Low-Power Shutdown Mode Ordering Information appears at end of data sheet. S Low RF Susceptibility Rejects TDMA Noise from GSM Radios S Extensive Click-and-Pop Reduction Circuitry S Robust Short-Circuit and Thermal Protection S Proven PCB Layout S Fully Assembled and Tested 2.5V TO 5.5V 10µF 0.1µF VDD GAIN A2 MAX98355A MAX98355B LRCLK C3 USB AUDIO INPUT XMOS BCLK C1 DIN B1 B2 DIGITAL AUDIO INTERFACE DAC A3 OUTP CLASS D OUTPUT STAGE B3 OUTN SD_MODE A1 C2 GND Figure 1. Simplified Block Diagram For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  1 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B Component List DESIGNATION QTY BCLK, LRCLK, SDIN, USB5V, XMCLK 0 Not installed, test points 1 10FF Q10%, 6.3V X5R ceramic capacitor (0603) Murata GRM188R60J106K C1 C2, C201, C202, C203, C218, C219, C220, C222, C225–C228, C231–C234 C3–C9, C73, C74, C75 16 DESCRIPTION 0.1FF Q10%, 16V X7R ceramic capacitors (0402) Murata GRM155R71C104K DESIGNATION QTY DESCRIPTION FOUTN, FOUTP, GND, VDD 4 Binding posts FOUTN, FOUTP, GND (x3), VDD, +3.3V 7 20G plated solid copper bus wire, 0.25in U-shaped wire loop GND (x3), OUTN 4 Black multipurpose test points (63mil drill size) J1 1 USB mini-AB receptacle J200 1 20-pin (2 x 10) IDC rightangle, polarized boxed header, 0.1in centers 0 Not installed, ceramic capacitors (0402) JU1 1 5-pin header JU2 1 4-pin header C200, C204, C205 JU3 1 9-pin (3 x 3) header 3 1FF Q10%, 6.3V X5R ceramic capacitors (0402) TDK C1005X5R0J105K JU4 1 2-pin header JU5 1 3-pin header C206, C235, C236 3 C207, C208, C213 C209, C210 C212 C214–C217 C221 3 0.01FF Q10%, 50V X7R ceramic capacitors (0603) Murata GRM188R71H103K L1, L2 0 1FF Q20%, 6.3V X5R ceramic capacitors (0603) Taiyo Yuden JMK107B7105MA Not installed, 22FH inductors (6.2mm x 6.3mm)—short (PC trace) TOKO D63CB series part TOKO A916CY-220M L201 1 3.3FH, 1.1A power inductor Sumida CDRH3D16NP-3R3NC LEDA, LEDB 2 Green LEDs (0603) OUTP 1 Red multipurpose test point (63mil drill size) Q200, Q201, Q202 3 n-channel enhancementmode FETs (SOT23) Fairchild BSS138 R1, R2 2 100kI Q5% resistors (0603) R3 1 226kI Q1% resistor (0603) R4 1 634kI Q1% resistor (0603) 2 2.2FF Q10%, 6.3V X5R ceramic capacitors (0603) Murata GRM188R60J225K 1 1000pF Q10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H102K 4 1 33pF Q5%, 50V C0G ceramic capacitors (0603) Murata GRM1885C1H330J 330pF Q5%, 50V C0G ceramic capacitor (0603) Murata GRM1885C1H331J R5, R6 0 Not installed, resistors (0402) R7, R8, R9 3 0I Q5% resistors (0402) R10 1 2kI Q1% resistor (0603) 2 4.7FF Q10%, 10V X5R ceramic capacitors (0805) Murata GRM219R61A475K R200 1 27kI Q5% resistor (0603) R201 1 100kI Q5% resistor (0603) C229, C230 2 4.7FF Q10%, 6.3V X5R ceramic capacitors (0603) Murata GRM188R60J475K R203, R204, R207, R210, R217, R220 6 10kI Q5% resistors (0603) D200 1 Red LED (0603) R205, R213 2 47kI Q5% resistors (0603) FB1, FB2 2 0I Q5% resistors (0603) R206 1 4.7I Q5% resistor (0603) 2 Ferrite beads (0603) Murata BLM18KG331SN1 R208 1 20kI Q5% resistor (0603) R209 0 Not installed, resistor (0603) R211 1 8.06kI Q1% resistor (0603) C223, C224 FB200, FB201   2 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B Component List (continued) DESIGNATION QTY DESCRIPTION R212, R219, R233, R234 4 1kI Q5% resistors (0603) R218, R221 2 2.2MI Q5% resistors (0603) R222 1 470I Q5% resistor (0603) R223, R224 2 33I Q5% resistors (0603) U1 1 I2S input Class D audio amplifier (9 WLP) Maxim MAX98355AEWL+ U200 1 XMOS processor (128 TQFP) U201 1 SPI 1Mb flash memory (8 SO) U202 1 USB 2.0 transceiver, ULPI (24 QFN) U203 1 3.3V low-noise linear regulator (5 SOT23) Maxim MAX8887EZK33+T U204 1 1.8V low-noise linear regulator (5 SC70) Maxim MAX8511EXK18+ U205 1 Voltage detector (5 SOT23) U206 1 TinyLogic UHS dual buffer (6 SC70) Fairchild NC7WZ07P6X DESIGNATION QTY DESCRIPTION U208 1 Dual, unbuffered inverter (6 SC70) Fairchild NC7WZU04P6X U209 1 2-input multiplexer (6 SC70) Fairchild NC7SZ157P6X U210 1 Dual logic buffer (6 SC70) Fairchild NC7WZ17P6X U211 1 Microprocessor-reset circuit (3 SC70) Maxim MAX803TEXR+ U212 1 1A step-down regulator (10 FMAXM) Maxim MAX1974EUB+ Y1 1 13MHz clock oscillator (2.5mm x 2.0mm) Y200 1 24.576MHz crystal (6.0mm x 3.3mm) Y201 1 11.2896MHz crystal (6.0mm x 3.3mm) — 4 Shunts — 1 PCB: MAX98355 EVALUATION KIT Optional Components DESIGNATION QTY C3–C7 5 DESCRIPTION DESIGNATION QTY L1, L2 2 22FH, 1A inductors (6.2mm x 6.3mm) TOKO A916CY-220M R5, R6 2 22I Q5% resistors (0402) 0.22FF Q10%, 6.3V XR5 ceramic capacitors (0402) TDK C1005X5R0J224K DESCRIPTION Component Suppliers SUPPLIER PHONE WEBSITE Fairchild Semiconductor 888-522-5372 www.fairchildsemi.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Sumida Corp. 847-545-6700 www.sumida.com Taiyo Yuden 800-348-2496 www.t-yuden.com TDK Corp. 847-803-6100 www.component.tdk.com TOKO America, Inc. 847-297-0070 www.tokoam.com Note: Indicate that you are using the MAX98355 when contacting these component suppliers. µMAX is a registered trademark of Maxim Integrated Products, Inc.   3 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B Quick Start • MAX98355 EV kit Recommended Equipment • 2.5V to 5.5V, 2A DC power supply • USB audio source (from computer through an audio media player such as iTunesM or WindowsM Media Player) • USB cable (included in the EV kit box) • 4I to 8I speaker Procedure 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 necessary connections are completed. 1) Verify that shunts are installed as follows: JU1: Pins 1-5 (12dB gain) JU2: Pins 1-3 (left audio channel selected) JU3: Pins 2-3 (I2S input from XMOS, MAX98355A only) JU4: Installed (VDDIO supplied from on-board power supply JU5: Pins 2-3 (device in shutdown mode) 2) Set the power-supply output to 5V. Disable the power supply. 3) Connect the power-supply ground terminal to the GND PCB pad and the power-supply positive terminal to the VDD PCB pad on the EV kit. 4) Connect the speaker across the OUTP and OUTN test points. 5) Enable the power-supply output. 6) With the audio source disabled, connect the USB audio source to J1 on the EV kit. Change the shunt on JU5 to pins 1-2 (device enabled for normal operation). 7) Enable the audio source. 8) Verify that the speakers are playing the audio source signal. Detailed Description of Hardware Filterless Output The MAX98355 EV kit’s filterless outputs (OUTP, OUTN) can be connected directly to a speaker load without any filtering. Use the OUTP and OUTN test points to connect the speaker directly to the device output. Filtered Output Audio analyzers typically cannot accept the Class D amplifier’s 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 kit’s lowpass filter RC components are unpopulated and L1, L2 are shorted on the PCB. To use the filtered output posts (FOUTP, FOUTN), remove the shorts on L1 and L2 and install components L1, L2, C3–C7, and R5, R6 (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 a 4I speaker. Jumper Selection Selectable Gain (GAIN) The EV kit features a 5-pin jumper (JU1) to control the device’s five programmable gain settings. See Table 1 for gain-control configuration. SD_MODE Input The EV kit features a 4-pin jumper (JU2) to control the audio channel that is sent to the amplifier output and a 3-pin jumper (JU5) to enable/disable the IC. JU2 is used to select the stereo input (left channel, right channel, or the average of the left/right channels). JU5 must be set to pins 1-2 for normal operation. See Table 2 for shunt positions. Shutdown Mode The device features a low-power shutdown mode that is activated by setting jumper JU5 to pins 2-3. To exit shutdown mode, set JU5 to pins 1-2 and select the desired stereo input channel using jumper JU2. See Table 3 for shunt positions. Table 1. JU1 Jumper Selection (GAIN) SHUNT POSITION GAIN PIN GAIN (dB) RELATIVE TO A 2.1dBV REFERENCE LEVEL 1-2 Connected to VDD through 100kI resistor R1 3 1-3 Connected to VDD 6 1-4 Connected to GND through 100kI resistor R2 15 1-5* Connected to GND 12 Not installed Unconnected 9 *Default position. iTunes is a registered trademark of Apple Inc. Windows is a registered trademark and registered service mark of Microsoft Corp.   4 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B External/Internal VDDIO (+3.3V) On the EV kit, a logic voltage from a control interface is needed for proper selection of the stereo input channel through SD_MODE. This voltage can be applied externally at the +3.3V PCB pad or it can be provided from on-board circuitry. See Table 4 for shunt positions. If the USB cable is disconnected (such as when the XMOS chip is not in use), the on-board circuitry to generate the +3.3V is not available. In this case, remove the shunt from jumper JU4 and supply an external voltage at the +3.3V PCB pad. Logic voltages other than +3.3V can be used on the EV kit. If other logic voltages are used, resistors R3 and R4 must be adjusted. See the SD_MODE and Shutdown Operation section in the MAX98355A/ MAX98355B IC data sheet for more information. Driving I2S Directly The EV kit provides an on-board XMOS chip to generate the I2S signal from the USB audio source. To utilize the XMOS chip, all positions of jumper JU3 must be set betweens pins 2-3. To bypass the XMOS and drive the digital audio interface directly, remove the shunts from JU3 and apply signals at the BCLK, LRCLK, and SDIN test points or between JU3 pins 1-2 at the appropriate locations (pin 1 is signal ground). The XMOS chip is configured for I2S output so it cannot be used with the MAX98355B (left-justified data). To evaluate the MAX98355B with left-justified data or the MAX98355A/ MAX98355B with TDM data, use the external data input option by removing the shunts from JU3 pins 2-3 and drive the digital audio interface directly. Table 2. JU2 and JU5 Jumper Selection (SD_MODE) SHUNT POSITION JU2 JU5 SD_MODE PIN DEVICE OPERATION 1-2 1-2* Connected to VDDIO through R3 (226kI resistor) Right audio channel selected 1-3* 1-2* Connected to VDDIO Left audio channel selected 1-4 1-2* Connected to VDDIO through R4 (634kI resistor) Mono mix (left + right)/2 X 2-3 Connected to GND Shutdown *Default position. X = Don’t care. Table 3. JU3 Jumper Selection (Digital Audio Interface) SHUNT POSITION BCLK, LRCLK, DIN 2-3* Connected to XMOS Not installed Unconnected DEVICE OPERATION XMOS IC provides I2S input data to the MAX98355A. Use this configuration when connecting an external digital audio source to the MAX98355A or when evaluating the MAX98355B. Connect external BCLK/LRCLK/DIN to column 2 and GND to column 1. *Default position. Table 4. JU4 Jumper Selection (VDDIO) SHUNT POSITION Installed* Not installed LOGIC VOLTAGE (VDDIO) 3.3V supplied from on-board power supply. User-supplied external power supply applied at the +3.3V PCB pad. *Default position.   5 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B Figure 2a. MAX98355 EV Kit Schematic (Sheet 1 of 6)   6 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B Figure 2b. MAX98355 EV Kit Schematic (Sheet 2 of 6)   7 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B Figure 2c. MAX98355 EV Kit Schematic (Sheet 3 of 6)   8 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B Figure 2d. MAX98355 EV Kit Schematic (Sheet 4 of 6)   9 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B Figure 2e. MAX98355 EV Kit Schematic (Sheet 5 of 6)   10 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B Figure 2f. MAX98355 EV Kit Schematic (Sheet 6 of 6)   11 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B 1.0” Figure 3. MAX98355 EV Kit Component Placement Guide—Component Side 1.0” Figure 4. MAX98355 EV Kit PCB Layout—Component Side   12 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B 1.0” Figure 5. MAX98355 EV Kit PCB Layout—Layer 2 1.0” Figure 6. MAX98355 EV Kit PCB Layout—Layer 3   13 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B 1.0” Figure 7. MAX98355 EV Kit PCB Layout—Solder Side 1.0” Figure 8. MAX98355 EV Kit Component Placement Guide—Solder Side   14 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B Ordering Information PART TYPE MAX98355EVKIT# EV Kit #Denotes RoHS compliant.   15 MAX98355 Evaluation Kit Evaluates: MAX98355A/MAX98355B Revision History REVISION NUMBER REVISION DATE 0 7/12 DESCRIPTION Initial release PAGES CHANGED — 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. Maxim Integrated Products, Inc. 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 ©  2012 Maxim Integrated Products 16 Maxim is a registered trademark of Maxim Integrated Products, Inc.