19-5505; Rev 0; 9/10 MAX98400B Evaluation Kit The MAX98400B evaluation kit (EV kit) configures the MAX98400B Class D amplifier to drive 2x12W into a pair of 8I speakers in stereo mode for audio applications. The EV kit operates from an 8V to 28V DC power supply. The EV kit has a programmable gain and the jumper settings default to a +20.1dB gain. The EV kit accepts a pair of single-ended or differential input signals and provides two sets of differential outputs for speakers. The EV kit has two independent amplifier circuits, demonstrating direct speaker driving (for low component count) and filtered output driving (for ease of evaluation). The EV kit comes with two MAX98400BETG+ devices installed. The EV kit provides an option to control the limiter, thermal foldback, input configuration, gain, and shutdown mode of the device. The EV kit includes convenient audio input and output connectors. Features S 8V to 28V Single DC Power-Supply Operation S Fully Differential Inputs and Outputs S Drives 2x12W into 8I Speakers in Stereo Mode S Limiter Control S Thermal Foldback S Shutdown Control S Evaluates the MAX98400B in a 24-Pin TQFN Package with an Exposed Pad S U1 Configured for Filterless Output S U2 Configured for Filtered Output S Fully Assembled and Tested Ordering Information PART TYPE MAX98400BEVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION FILTERLESS EVALUATION (U1) C101 C102A, C102B C103, C104 C105-C108 1 220FF Q20%, 35V electrolytic capacitor (radial leaded, 5mm spacing), 10mm diameter x 12.5mm high Panasonic EEU-FM1V221 2 1FF Q10%, 50V X7R ceramic capacitors (0805) TDK C2012X7R1H105K 2 1FF Q10%, 10V X7R ceramic capacitors (0603) Murata GRM188R71A105K 4 1FF Q10%, 25V X7R ceramic capacitors (0805) Murata GRM21BR71E105K C111-C114 0 Not installed, ceramic capacitors (0603) FB1 1 22I at 100MHz ferrite bead (0805) Murata BLM21PG220SN1D DESIGNATION QTY GAIN1_1, GAIN2_1, LIM_1 DESCRIPTION 3 3-pin headers INL1 1 White phono jack INR1 1 Red phono jack JU104, JU105, SHDN_1, TEMP_1 4 2-pin headers L1+, L1-, R1+, R1- 0 Not installed, multipurpose test points R101, R103, R104, R105 0 Not installed, resistors (0603) R106 0 Not installed, potentiometer (3/8in) R107 1 100kI Q5% resistor (0603) R111-R114 4 0I Q5% resistors (0805) SPKL1+, SPKL1-, SPKR1+, SPRK1- 4 Binding posts U1 1 Stereo Class D audio amplifier (24 TQFN-EP*) Maxim MAX98400BETG+ ________________________________________________________________ Maxim Integrated Products 1 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. Evaluates: MAX98400B General Description Evaluates: MAX98400B MAX98400B Evaluation Kit Component List (continued) DESIGNATION -- -- QTY DESCRIPTION DESIGNATION QTY INL2 1 White phono jack 10 600I at 100MHz, 150mI DCR, 2A ferrite beads (0805) Wurth Elektronik 742792040 10 330pF Q10%, 50V X7R ceramic capacitors (0603) TDK C1608X7R1H331K FILTERED EVALUATION (U2) C201 1 220FF Q20%, 35V electrolytic capacitor (radial leaded, 5mm spacing), 10mm diameter x 12.5mm high Panasonic EEU-FM1V221 C202A, C202B 2 1FF Q10%, 50V X7R ceramic capacitors (0805) TDK C2012X7R1H105K C203, C204 2 1FF Q10%, 10V X7R ceramic capacitors (0603) Murata GRM188R71A105K C205-C208 4 C220-C223, C226-C229 8 C224, C225 2 DESCRIPTION INR2 1 Red phono jack JU204, JU205 2 2-pin headers L20-L23 4 33FH Q20%, 3.1A inductors Sumida CDRH127NP-330NC R201, R203, R204, R205 0 Not installed, resistors (0603) R206 0 Not installed, potentiometer (3/8in) R207 1 100kI Q5% resistor (0603) R226-R229 4 15I Q5% resistors (1206) U2 1 Stereo Class D audio amplifier (24 TQFN-EP*) Maxim MAX98400BETG+ COMMON TO BOTH SIDES C1 1 1FF Q10%, 25V X7R ceramic capacitors (0805) Murata GRM21BR71E105K 0.1FF Q10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H104K C2 1 0.15FF Q10%, 50V X7R ceramic capacitors (0805) Murata GRM21BR71H154K 1FF Q10%, 10V X7R ceramic capacitor (0603) Murata GRM188R71A105K D1 1 0.68FF Q10%, 50V X7R ceramic capacitors (0805) Murata GRM21BR71H684K 4.3V, 20mA zener diode (SOT23) Central Semi CMPZ5229B JU1 1 3-pin header PGND, PVDD 2 Binding posts R1 1 10kI Q5% resistor (0603) -- 13 Shunts -- 1 PCB: MAX98400B EVALUATION KIT+ FB2 1 22I ferrite bead (0805) Murata BLM21PG220SN1D FOUTL2+, FOUTL2-, FOUTR2+, FOUTR2- 4 Binding posts GAIN1_2, GAIN2_2, LIM_2 3 3-pin headers *EP = Exposed pad. Component Suppliers SUPPLIER PHONE WEBSITE Central Semiconductor Corp. 631-435-1110 www.centralsemi.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Panasonic Corp. 800-344-2112 www.panasonic.com Sumida Corp. 847-545-6700 www.sumida.com TDK Corp. 847-803-6100 www.component.tdk.com Wurth Electronik GmbH & Co. KG 201-785-8800 www.we-online.com Note: Indicate that you are using the MAX98400B when contacting these component suppliers. 2 _______________________________________________________________________________________ MAX98400B Evaluation Kit * MAX98400B EV kit Required Equipment * 8V to 28V, 3A DC power supply * Audio source with volume control (e.g., CD player) * Two speakers Procedure--Filterless Evaluation (U1) 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 all jumpers are in their default positions, as shown in Table 1. 2) If not using the filtered evaluation side, remove the shunt from SHDN_2 (disable). 3) Connect the first speaker across the SPKL1- and SPKL1+ PCB binding posts. 4) Connect the second speaker across the SPKR1and SPKR1+ PCB binding posts. 5) Connect the positive terminal of the power supply to the PVDD binding post and the power-supply ground terminal to the PGND binding post. 6) Connect the left output terminal of the audio source to the INL1 RCA phono jack. 7) Connect the right output terminal of the audio source to the INR1 RCA phono jack. 8) Turn on the audio source at minimum volume. 9) Turn on the power supply. 10) Gradually increase the audio source volume until audio is heard through the loud speakers. Procedure--Filtered Evaluation (U2) 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 all jumpers are in their default positions, as shown in Table 2. 2) If not using the filterless evaluation side, remove the shunt from SHDN_1 (disable). 3) Connect the first speaker across the FOUTL2- and FOUTL2+ PCB binding posts. 4) Connect the second speaker across the FOUTR2and FOUTR2+ PCB binding posts. 5) Connect the positive terminal of the power supply to the PVDD binding post and the power-supply ground terminal to the PGND binding post. 6) Connect the left output terminal of the audio source to the INL2 RCA phono jack. 7) Connect the right output terminal of the audio source to the INR2 RCA phono jack. 8) Turn on the audio source at minimum volume. 9) Turn on the power supply. 10) Gradually increase the audio source volume until audio is heard through the loud speakers. Detailed Description of Hardware The MAX98400B EV kit provides a proven layout for evaluating the MAX98400B. The EV kit is designed to evaluate the device in a 24-pin TQFN package with an exposed pad. The device is a Class D amplifier that can be configured to drive 2x12W into a pair of 8I speakers. The EV kit operates from a DC power supply that provides 8V to 28V and 3A of current. The EV kit PCB is designed with two layers and has 2oz copper for optimized power dissipation. Each side of the EV kit accepts a pair of differential or single-ended input signals and provides two sets of amplified differential audio outputs. Optional External Preamplifier Power Supply (VS) The EV kit provides input pads (VS1 for U1 and VS2 for U2) to accept an optional 5V external power supply for powering the device's preamplifiers. The external power supply for the preamplifiers must be in the 4.5V to 5.5V range. Refer to the MAX98400A/MAX98400B IC data sheet for more information. _______________________________________________________________________________________ 3 Evaluates: MAX98400B Quick Start Evaluates: MAX98400B MAX98400B Evaluation Kit Filterless Output (U1) The EV kit's filterless outputs (SPKL1+/SPKL1- and SPKR1+/SPKR1-) can be connected directly to a pair of speaker loads without any filtering. Output Filtering Requirements (U1) The device can pass CE EN55022B regulations with only ferrite-bead filters, especially when speaker-wire lengths are less than or equal to 1m. To install the ferrite-bead filters, first remove the 0I resistors (R111-R114). Next, replace resistors R111-R114 with ferrite beads listed in Table 3 (provided with the EV kit), and install filter capacitors on the C111-C114 pads. The speaker wire should be connected to the L1+/L1- and R1+/R1- test points. Although component selection for the output filter is dependent on speaker-wire length, the components in Table 3 are provided with the EV kit as a starting point. Final component selection should be determined during EMC testing. Contact the factory, if required. Note that an inductive load is required at this terminal. If using an 8I power resistor, add a 68FH series inductor. If using a 4I power resistor, add a 33FH series inductor. Filtered Output (U2) Audio analyzers typically cannot accept pulse-width modulated (PWM) signals at their inputs. Therefore, the EV kit features a pair of lowpass filters at each of the outputs to ease evaluation. Use the filtering output posts (FOUTL2+/FOUTL2- and FOUTR2+/FOUTR2-) to connect the filtered PWM outputs to the audio analyzer. The default lowpass filters at the EV kit outputs are optimized for a pair of 8I power resistors or 8I speakers. Thermal Foldback As shipped from the factory, the thermal-foldback feature is enabled (TEMP_1 and TEMP_2 jumpers open). To disable thermal foldback, install a shunt across the TEMP_1 or TEMP_2 jumper. Refer to the MAX98400A/ MAX98400B IC data sheet for information on selecting this resistor value. Limiter As shipped from the factory, the limiter-threshold control is disabled. To enable the limiter in PVDD tracking mode, move the LIM_1 or LIM_2 shunt to the 2-3 position. To enable the limiter in programmable mode, leave the LIM_1 or LIM_2 jumper open and select appropriate values for R103, R104, and R105 or R203, R204, and R205. Refer to the MAX98400A/MAX98400B IC data sheet for information on selecting these component values. Table 1. Jumper Descriptions (U1) JUMPER SHUNT POSITION 1-2* SHDN_1 DESCRIPTION Normal operation; U1 SHDN = DVDD (external logic-high) Open Shutdown; U1 SHDN = GND Open* Thermal foldback enabled; U1 TEMPLOCK = unconnected 1-2 Thermal foldback disabled; U1 TEMPLOCK = GND 1-2* Limiter disabled; U1 LIM_TH = VS1 2-3 Limiter enabled in PVDD tracking mode; U1 LIM_TH = GND Open Limiter programmable mode; U1 LIM_TH is determined by R103, R104, and R105 TEMP_1 LIM_1 JUMPER SHUNT POSITION 1-2* JU104 Open 1-2* JU105 Open GAIN1_1 Single-ended input mode; U1 INL- = GND Differential input mode; U1 INLis not connected to GND Single-ended input mode; U1 INR- = GND Differential input mode; U1 INRis not connected to GND 1-2 U1 G1 = VS1 2-3* U1 G1 = GND Open GAIN2_1 DESCRIPTION U1 G1 is not driven 1-2 U1 G2 = VS1 2-3 U1 G2 = GND Open* U1 G2 is not driven *Default position. 4 _______________________________________________________________________________________ MAX98400B Evaluation Kit JUMPER SHUNT POSITION 1-2* SHDN_2 DESCRIPTION Normal operation; U2 SHDN = DVDD (external logic high) Table 3. Recommended EMI Filter Components for 8I Loads DESIGNATION DESCRIPTION R111-R114 600I at 100MHz, 150mI DCR, 2A ferrite beads (0805) Wurth Elektronik 742792040 C111-C114 330pF Q10%, 50V X7R ceramic capacitors (0603) Murata GRM188R71H331K or TDK C1608X7R1H331K Open Shutdown; U2 SHDN = GND Open* Thermal foldback enabled; U2 TEMPLOCK = unconnected 1-2 Thermal foldback disabled; U2 TEMPLOCK = GND 1-2* Limiter disabled; U2 LIM_TH = VS2 Note: 3A current-rating ferrite beads are recommended for 4I load drive. 2-3 Limiter enabled in PVDD tracking mode; U2 LIM_TH = GND Table 4. Gain Jumper Descriptions* Open Limiter programmable mode; U2 LIM_TH is determined by R203, R204, and R205 TEMP_2 LIM_2 1-2* JU204 Open 1-2* JU205 Open GAIN1_2 Differential input mode; U2 INLis not connected to GND Single-ended input mode; U2 INR- = GND Differential input mode; U2 INRis not connected to GND 1-2 U2 G1 = VS2 2-3* U2 G1 = GND Open GAIN2_2 Single-ended input mode; U2 INL- = GND GAIN2_1, GAIN2_2 2-3 Open 9.0 2-3 1-2 20.1 Open 1-2 23.3 26.4 2-3 Open 13.0 16.7 2-3 Open GAIN (dB) 29.8 1-2 1-2 32.9 Reserved *GAIN1_1 and GAIN2_1 set the gain for U1. GAIN1_2 and GAIN2_2 set the gain for U2. U2 G1 is not driven 1-2 U2 G2 = VS2 2-3 U2 G2 = GND Open* SHUNT POSITION GAIN1_1, GAIN1_2 U2 G2 is not driven *Default position. _______________________________________________________________________________________ 5 Evaluates: MAX98400B Table 2. Jumper Descriptions (U2) Evaluates: MAX98400B MAX98400B Evaluation Kit Figure 1a. MAX98400B EV Kit Schematic (Sheet 1 of 3) 6 _______________________________________________________________________________________ MAX98400B Evaluation Kit Evaluates: MAX98400B Figure 1b. MAX98400B EV Kit Schematic (Sheet 2 of 3) _______________________________________________________________________________________ 7 Evaluates: MAX98400B MAX98400B Evaluation Kit Figure 1c. MAX98400B EV Kit Schematic (Sheet 3 of 3) 8 _______________________________________________________________________________________ MAX98400B Evaluation Kit Evaluates: MAX98400B Figure 2. MAX98400B EV Kit Component Placement Guide--Component Side _______________________________________________________________________________________ 9 Evaluates: MAX98400B MAX98400B Evaluation Kit Figure 3. MAX98400B EV Kit PCB Layout--Component Side 10 MAX98400B Evaluation Kit Evaluates: MAX98400B Figure 4. MAX98400B EV Kit PCB Layout--Solder Side ______________________________________________________________________________________ 11 MAX98400B Evaluation Kit Evaluates: MAX98400B Revision History REVISION NUMBER REVISION DATE 0 9/10 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. 12 (c) 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. Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX98400BEVKIT+