9-5477; Rev 0; 8/0 MAX98400A Evaluation Kit General Description The MAX98400A evaluation kit (EV kit) configures the MAX98400A Class D amplifier to drive x0w into a pair of 8I speakers in stereo mode, or x40w into a 4I speaker in mono mode, for audio applications. The EV kit operates from an 8V to 8V DC power supply. The EV kit is configured for +0.dB gain. The EV kit accepts a pair of singleended or differential input signals and provides two sets of differential outputs for speakers. The EV kit has two independent MAX98400A circuits, demonstrating direct speaker driving (for low component count) and filtered output driving (for ease of evaluation). The EV kit comes with two MAX98400AETX+ devices installed. The EV kit provides an option to control the limiter, thermal foldback, input configuration, gain, shutdown, and mono mode of the MAX98400A. The EV kit also provides an input pad to accept an optional external power supply for powering the device s preamplifiers. The EV kit includes convenient audio input and output connectors. Features S 8V to 8V Single DC Power-Supply Operation S Fully Differential Inputs and Outputs S Drives x0w into 8I Speakers in Stereo Mode S Drives x40w into 4I Speaker in Mono Mode S Limiter Control S Thermal Foldback S Shutdown Control S Evaluates the MAX98400A in a 6-Pin TQFN Package with an Exposed Pad S U Configured for Filterless Output S U Configured for Filtered Output S Fully Assembled and Tested PART Ordering Information TYPE MAX98400AEVKIT+ EV Kit +Denotes lead(pb)-free and RoHS compliant. DESIGNATION QTY DESCRIPTION FILTERLESS EVALUATION (U) C0 C0A, C0B C0, C04 0FF Q0%, 5V electrolytic capacitor (radial leaded, 5mm spacing), 0mm diameter x.5mm high Panasonic EEU-FMV FF Q0%, 50V X7R ceramic capacitors (0805) TDK C0X7RH05K FF Q0%, 0V X7R ceramic capacitors (060) Murata GRM88R7A05K Component List DESIGNATION QTY DESCRIPTION GAIN_, GAIN_, LIM_ -pin headers INL White phono jack INR Red phono jack JU04, JU05, SHDN_, TEMP_ L+, L-, R+, R- 4 -pin headers 0 Not installed, multipurpose test points MONO_ 0 Not installed, -pin header R0, R0, R04, R05 0 Not installed, resistors (060) C05 C08 4 C C4 0 FB FF Q0%, 5V X7R ceramic capacitors (0805) Murata GRMBR7E05K Not installed, ceramic capacitors (060) I at 00MHz ferrite bead (0805) Murata BLMPG0SND R0, R07 00kI Q5% resistors (060) R06 0 Not installed, potentiometer (/8in) R R4 4 0I Q5% resistors SPKL+, SPKL-, SPKR+, SPRK- 4 Binding posts Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at -888-69-464, or visit Maxim s website at www.maxim-ic.com.
DESIGNATION QTY DESCRIPTION U 0 0 FILTERED EVALUATION (U) C0 C0A, C0B C0, C04 C05 C08 4 C0 C, C6 C9 8 C4, C5 FB FOUTL+, FOUTL-, FOUTR+, FOUTR- Stereo Class D audio amplifier (6 TQFN-EP*) Maxim MAX98400AETX+ 600I at 00MHz, 50mI DCR, A ferrite beads (0805) Würth Elektronik 7479040 0pF Q0%, 50V X7R ceramic capacitors (060) TDK C608X7RHK 0FF Q0%, 5V electrolytic capacitor (radial leaded, 5mm spacing), 0mm diameter x.5mm high Panasonic EEU-FMV FF Q0%, 50V X7R ceramic capacitors (0805) TDK C0X7RH05K FF Q0%, 0V X7R ceramic capacitors (060) Murata GRM88R7A05K FF Q0%, 5V X7R ceramic capacitors (0805) Murata GRMBR7E05K 0.5FF Q0%, 50V X7R ceramic capacitors (0805) Murata GRMBR7H54K 0.68FF Q0%, 50V X7R ceramic capacitors (06) Murata GRMMR7H684K I ferrite bead (0805) Murata BLMPG0SND 4 Binding posts *EP = Exposed pad. Component List (continued) DESIGNATION QTY DESCRIPTION GAIN_, GAIN_, LIM_ -pin headers INL White phono jack INR Red phono jack JU04, JU05, SHDN_, TEMP_ L0 L 4 4 -pin headers FH Q0%,.0A inductors (.mm x.mm) Sumida CDRH7NP-0NC MONO_ 0 Not installed, -pin header R0, R0, R04, R05 0 Not installed, resistors (060) R0, R07 00kI Q5% resistors (060) R06 0 Not installed, potentiometer (/8in) R6 R9 4 5I Q5% resistors (06) U COMMON TO BOTH SIDES C C D JU -pin header Stereo Class D audio amplifier (6 TQFN-EP*) Maxim MAX98400AETX+ 0.FF Q0%, 50V X7R ceramic capacitor (060) Murata GRM88R7H04K FF Q0%, 0V X7R ceramic capacitor (060) Murata GRM88R7A05K 4.V, 0mA zener diode (SOT) Central Semi CMPZ59B, Binding posts R 0kI Q5% resistor (060) Shunts PCB: MAX98400A EVALUATION KIT+
MAX98400A EV kit 8V to 8V, 5A DC power supply Quick Start Required Equipment Audio source with volume control (e.g., CD player) Two speakers Procedure Filterless Evaluation (U) 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. ) Verify that all jumpers are in their default positions, as shown in Table. ) If not using the filtered evaluation side, remove the shunt on SHDN_ (disable). ) Connect the first speaker across the SPKL- and SPKL+ PCB binding posts. 4) Connect the second speaker across the SPKR- and SPKR+ PCB binding posts. 5) Connect the positive terminal of the power supply to the binding post and the power-supply ground terminal to the binding post. 6) Connect the left output terminal of the audio source to the INL RCA phono jack. 7) Connect the right output terminal of the audio source to the INR RCA phono jack. 8) Turn on the audio source at minimum volume. 9) Turn on the power supply. SUPPLIER PHONE WEBSITE Central Semiconductor Corp. 6-45-0 www.centralsemi.com Würth Electronik GmbH & Co. KG 0-785-8800 www.we-online.com Note: Indicate that you are using the MAX98400A when contacting these component suppliers. 0) Gradually increase the audio source volume until audio is heard through the loud speakers. Procedure Filtered Evaluation (U) 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. ) Verify that all jumpers are in their default positions, as shown in Table. ) If not using the filterless evaluation side, remove the shunt on SHDN_ (disable). ) Connect the first speaker across the FOUTL- and FOUTL+ PCB binding posts. 4) Connect the second speaker across the FOUTR- and FOUTR+ PCB binding posts. 5) Connect the positive terminal of the power supply to the binding post and the power-supply ground terminal to the binding post. 6) Connect the left output terminal of the audio source to the INL RCA phono jack. 7) Connect the right output terminal of the audio source to the INR RCA phono jack. 8) Turn on the audio source at minimum volume. 9) Turn on the power supply. Component Suppliers Murata Electronics North America, Inc. 770-46-00 www.murata-northamerica.com Panasonic Corp. 800-44- www.panasonic.com Sumida Corp. 847-545-6700 www.sumida.com TDK Corp. 847-80-600 www.component.tdk.com 0) Gradually increase the audio source volume until audio is heard through the loud speakers.
Detailed Description of Hardware The MAX98400A EV kit provides a proven layout for evaluating the MAX98400A. The EV kit is designed to evaluate the device in a 6-pin TQFN package with an exposed pad. The device is a Class D amplifier that can be configured to drive x0w into a pair of 8Ω speakers, or x40w into a 4Ω speaker. The EV kit operates from a DC power supply that provides 8V to 8V and 5A of current. The EV kit PCB is designed with two layers and has oz 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 (VS for U and VS for U) to accept an optional 5V external power supply for powering the device s preamplifiers when the internal regulator is disabled. The external power supply for the preamplifiers must be in the 4.5V to 5.5V range. Filterless Output (U) The EV kit s filterless outputs (SPKL+/SPKL- and SPKR+/SPKR-) can be connected directly to a pair of speaker loads without any filtering. Output Filtering Requirements (U) The device can pass CE EN550B regulations with only ferrite-bead filters, especially when speaker-wire lengths are less than or equal to m. To install the ferrite-bead filters, first remove the 0Ω resistors (R R4). Next, replace resistors R R4 with ferrite beads listed in Table (provided with the EV kit), and install filter capacitors on the C C4 pads. The speaker wire should be connected to the L+/L- and R+/R- test points. Although component selection for the output filter is dependent on speaker-wire length, the components in Table 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 8Ω power resistor, add a 68µH series inductor. If using a 4Ω power resistor, add a µh series inductor. Filtered Output (U) 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 (FOUTL+/FOUTL- and FOUTR+/FOUTR-) 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 8Ω power resistors or 8Ω speakers. Mono Mode (MONO) The EV kit is preconfigured for stereo mode at the factory. To change the EV kit to operate in mono mode, short jumper MONO_ (U) or MONO_ (U) with a shorting wire, connect SPKL- to SPKR- (U) or FOUTL- to FOUTR- (U) with a short banana-lead cable, and connect SPKL+ to SPKR+ (U) or FOUTL+ to FOUTR+ (U) with a short banana-lead cable. Connect the audio input source to the INL or INL RCA jack. Thermal Foldback As shipped from the factory, the thermal-foldback feature is enabled (TEMP_ and TEMP_ jumpers open). To disable thermal foldback, install a shunt across the TEMP_ and TEMP_ jumpers. Refer to the MAX98400A/ MAX98400B IC data sheet. Limiter As shipped from the factory, the limiter-threshold control is disabled. To enable the limiter in tracking mode, move the LIM_ or LIM_ shunt to the - position. To enable the limiter in programmable mode, leave the LIM_ or LIM_ jumper open and select appropriate values for R0, R04, and R05 or R0, R04, and R05. Refer to the MAX98400A/MAX98400B IC data sheet for information on selecting these component values. 4
Table. Jumper Descriptions (U) JUMPER SHDN_ TEMP_ MONO_ LIM_ SHUNT POSITION -* * - * - -* - DESCRIPTION Normal operation; U SHDN = DVDD (external logic-high) Shutdown; U SHDN = GND Thermal foldback enabled; U TEMPLOCK = unconnected Thermal foldback disabled; U TEMPLOCK = GND Stereo mode; U MONO is pulled to GND by R0 Mono mode; U MONO is pulled to VS Limiter disabled; U LIM_TH = VS Limiter enabled in tracking mode; U LIM_TH = GND Limiter programmable mode; U LIM_TH is determined by R0, R04, and R05 Table. Jumper Descriptions (U) JUMPER SHDN_ TEMP_ MONO_ LIM_ SHUNT POSITION -* * - * - -* - DESCRIPTION Normal operation; U SHDN = DVDD (external logic-high) Shutdown; U SHDN = GND Thermal foldback enabled; U TEMPLOCK = unconnected Thermal foldback disabled; U TEMPLOCK = GND Stereo mode; U MONO is pulled to GND by R0 Mono mode; U MONO is pulled to VS Limiter disabled; U LIM_TH = VS Limiter enabled in tracking; U LIM_TH = GND Limiter programmable mode; U LIM_TH is determined by R0, R04, and R05 JU04 -* Single-ended input mode; U INL- = GND Differential input mode; U INLis not connected to GND JU04 -* Single-ended input mode; U INL- = GND Differential input mode; U INLis not connected to GND JU05 GAIN_ GAIN_ -* * *Default position. Single-ended input mode; U INR- = GND Differential input mode; U INRis not connected to GND - U G = VS -* U G = GND U G is not driven - U G = VS - U G = GND U G is not driven JU05 GAIN_ GAIN_ -* * *Default position. Single-ended input mode; U INR- = GND Differential input mode; U INRis not connected to GND - U G = VS -* U G = GND U G is not driven - U G = VS - U G = GND U G is not driven 5
Table. Recommended EMI Filter Components for 8I Loads DESIGNATION R R4 C C4 Note: A current-rating ferrite beads are recommended for 4I load drive. DESCRIPTION 600I at 00MHz, 50mI DCR, A ferrite beads (0805) Würth Elektronik 7479040 0pF Q0%, 50V X7R ceramic capacitors (060) Murata GRM88R7HK or TDK C608X7RHK Table 4. Gain Jumper Descriptions* GAIN_, GAIN_ - SHUNT POSITION GAIN_, GAIN_ *GAIN_ and GAIN_ set the gain for U. GAIN_ and GAIN_ set the gain for U. GAIN (db) 9.0 -.0-6.7-0.. - 6.4-9.8 -.9 - Reserved FB FERRITE DVDD FB C 0.uF FERRITE JU R 0k D 4.V, 0mA C uf Figure a. MAX98400A EV Kit Schematic (Sheet of ) 6
INL INR VS AGND INL+ JU04 INR+ JU05 INL- INR- C05 uf C06 uf C07 uf C08 uf INL+ INL- 7 INR+ 6 INR- EP C0 uf GAIN_ GAIN_ SHDN_ 00k C04 uf R 0 C SPKL+ TEMP_ OUTR- R0 9 TEMPLOCK L- SPKL- R 0 4 OUTL+ OUTL+ 5 C OUTR+ C SPKR+ 6 OUTL- R+ OUTL- R 0 4 OUTR+ OUTR- 7 LIM_TH 0 R- SPKR- VS R4 0 9 G MONO RELEASE 0 MONO_ C4 R0 00k R0 R04 LIM_ R05 4 GND 5 GND 8 N.C. 9 0 4 5 6 N.C. N.C. VS 6 7 8 G SHDN VS C0 0uF 5V + C0A uf C0B uf N.C. 8 N.C. N.C. 5 N.C. VS U MAX98400A VS DVDD VS R07 L+ VS VS R06 Figure b. MAX98400A EV Kit Schematic (Sheet of ) 7
INL+ INL JU04 INR+ INR JU05 INL- INR- VS AGND C05 uf C06 uf C07 uf C08 uf INL+ INL- 7 INR+ 6 INR- EP C0 uf GAIN_ GAIN_ SHDN_ C04 uf TEMPLOCK C6 C0 C4 0.5uF 0.5uF TEMP_ 0.68uF R0 C C7 9 0.5uF 0.5uF 4 OUTL+ 5 OUTL+ OUTR+ OUTR+ OUTL- OUTL- OUTR- OUTR- LIM_TH L R8 uh 5 FOUTR+ 4 C C5 0.5uF 0.68uF C8 0.5uF 6 7 L R9 uh 5 0 C9 C 0.5uF 0.5uF FOUTL- VS FOUTR- R0 R04 MONO_ LIM_ R05 R0 00k R06 SHDN 9 G MONO RELEASE 0 5 GND 8 N.C. 9 0 4 5 6 N.C. N.C. VS 6 7 8 G N.C. 8 N.C. N.C. 5 N.C. U MAX98400A L0 R6 FOUTL+ uh 5 L R7 uh 5 4 GND VS C0 0uF 5V + C0A uf C0B uf VS VS DVDD VS R07 00k VS VS Figure c. MAX98400A EV Kit Schematic (Sheet of ) 8
.0 Figure. MAX98400A EV Kit Component Placement Guide Component Side 9
.0 Figure. MAX98400A EV Kit PCB Layout Component Side 0
.0 Figure 4. MAX98400A EV Kit PCB Layout Solder Side
REVISION NUMBER REVISION DATE DESCRIPTION Revision History PAGES CHANGED 0 8/0 Initial release 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, 0 San Gabriel Drive, Sunnyvale, CA 94086 408-77-7600 00 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.