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MAX98400A Evaluation Kit

Evaluates: MAX98400A

General Description

The MAX98400A evaluation kit (EV kit) configures the

MAX98400A Class D amplifier to drive 2x20W into a pair of

8I speakers in stereo mode, or 1x40W into a 4I speaker

in mono mode, for audio applications. The EV kit operates

from an 8V to 28V DC power supply. The EV kit is config-

ured for +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 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 28V Single DC Power-Supply Operation

S Fully Differential Inputs and Outputs

S Drives 2x20W into 8I Speakers in Stereo Mode

S Drives 1x40W into 4I Speaker in Mono Mode

S Limiter Control

S Thermal Foldback

S Shutdown Control

S Evaluates the MAX98400A in a 36-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

19-5477; Rev 0; 8/10

+Denotes lead(Pb)-free and RoHS compliant.

Component List

PART TYPE

MAX98400AEVKIT+ EV Kit

DESIGNATION QTY DESCRIPTION

FILTERLESS EVALUATION (U1)

C101 1

220FF Q20%, 35V electrolytic

capacitor (radial leaded, 5mm

spacing), 10mm diameter x

12.5mm high

Panasonic EEU-FM1V221

C102A, C102B 2

1FF Q10%, 50V X7R ceramic

capacitors (0805)

TDK C2012X7R1H105K

C103, C104 2

1FF Q10%, 10V X7R ceramic

capacitors (0603)

Murata GRM188R71A105K

C105–C108 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 DESCRIPTION

GAIN1_1,

GAIN2_1, LIM_1

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-

Not installed, multipurpose test

points

MONO_1 0 Not installed, 2-pin header

R101, R103,

R104, R105

0 Not installed, resistors (0603)

R102, R107 2

100kI Q5% resistors (0603)

R106 0

Not installed, potentiometer

(3/8in)

R111–R114 4

0I Q5% resistors

SPKL1+, SPKL1-,

SPKR1+, SPRK1-

4 Binding posts

Summary of content (12 pages)

PAGE 1
9-5477; Rev 0; 8/10 MAX98400A Evaluation Kit The MAX98400A evaluation kit (EV kit) configures the MAX98400A Class D amplifier to drive 2x20W into a pair of 8I speakers in stereo mode, or 1x40W into a 4I speaker in mono mode, for audio applications. The EV kit operates from an 8V to 28V DC power supply. The EV kit is configured for +20.1dB gain. The EV kit accepts a pair of singleended or differential input signals and provides two sets of differential outputs for speakers.
PAGE 2
Evaluates: MAX98400A MAX98400A Evaluation Kit Component List (continued) DESIGNATION U1 QTY DESCRIPTION DESIGNATION QTY 1 Stereo Class D audio amplifier (36 TQFN-EP*) Maxim MAX98400AETX+ GAIN1_2, GAIN2_2, LIM_2 3 3-pin headers INL2 1 White phono jack INR2 1 Red phono jack JU204, JU205, SHDN_2, TEMP_2 4 2-pin headers L20–L23 4 33FH Q20%, 3.0A inductors (12.3mm x 12.
PAGE 3
MAX98400A Evaluation Kit 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 Würth Electronik GmbH & Co. KG 201-785-8800 www.we-online.com Note: Indicate that you are using the MAX98400A when contacting these component suppliers.
PAGE 4
Evaluates: MAX98400A MAX98400A Evaluation Kit 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 36-pin TQFN package with an exposed pad. The device is a Class D amplifier that can be configured to drive 2x20W into a pair of 8Ω speakers, or 1x40W into a 4Ω speaker. The EV kit operates from a DC power supply that provides 8V to 28V and 5A of current.
PAGE 5
MAX98400A Evaluation Kit JUMPER SHDN_1 SHUNT POSITION 1-2* 1-2* DESCRIPTION Normal operation; U2 SHDN = DVDD (external logic-high) Open Shutdown; U2 SHDN = GND Open* Thermal foldback enabled; U1 TEMPLOCK = unconnected Open* Thermal foldback enabled; U2 TEMPLOCK = unconnected 1-2 Thermal foldback disabled; U1 TEMPLOCK = GND 1-2 Thermal foldback disabled; U2 TEMPLOCK = GND MONO_1 Stereo mode; U1 MONO is pulled to GND by R102 1-2 Mono mode; U1 MONO is pulled to VS1 1-2* Limiter disabled; U
PAGE 6
Evaluates: MAX98400A MAX98400A Evaluation Kit Table 3. Recommended EMI Filter Components for 8I Loads DESIGNATION R111–R114 C111–C114 Table 4. Gain Jumper Descriptions* SHUNT POSITION GAIN1_1, GAIN1_2 DESCRIPTION GAIN2_1, GAIN2_2 2-3 600I at 100MHz, 150mI DCR, 2A ferrite beads (0805) Würth Elektronik 742792040 9.0 Open 13.0 2-3 1-2 16.7 2-3 330pF Q10%, 50V X7R ceramic capacitors (0603) Murata GRM188R71H331K or TDK C1608X7R1H331K 20.1 Open Open 23.3 1-2 26.4 2-3 29.
PAGE 7
Figure 1b. MAX98400A EV Kit Schematic (Sheet 2 of 3) _______________________________________________________________________________________ 7 INL1- 1 2 VS1 JU105 INR1- AGND 1 2 JU104 INR1+ VS1 INR1 INL1 INL1+ C108 C107 C106 C105 1uF 1uF 1uF 1uF 35V C101 220uF + C102A 1uF 25 22 18 3 16 17 12 11 EP N.C. N.C. N.C. N.C. INR- INR+ INL- INL+ C102B 1uF 32 PVDD 31 PVDD GND GND 14 15 PVDD 7 U1 MAX98400A 1uF C103 VS1 6 VS 33 N.C.
PAGE 8
Figure 1c. MAX98400A EV Kit Schematic (Sheet 3 of 3) 8 _______________________________________________________________________________________ INL2- 1 2 VS2 JU205 INR2- AGND 1 2 JU204 INR2+ VS2 INR2 INL2 INL2+ 1 2 1 2 C208 C207 C206 C205 1uF 1uF 1uF 1uF 35V C201 220uF PVDD2 + C202A 1uF 25 22 18 3 16 17 12 11 EP N.C. N.C. N.C. N.C. INR- INR+ INL- INL+ C202B 1uF 32 PVDD 31 PVDD GND GND 14 15 PVDD VS2 7 MAX98400A U2 6 VS 33 N.C.
PAGE 9
MAX98400A Evaluation Kit Evaluates: MAX98400A 1.0’’ Figure 2.
PAGE 10
Evaluates: MAX98400A MAX98400A Evaluation Kit 1.0’’ Figure 3.
PAGE 11
MAX98400A Evaluation Kit Evaluates: MAX98400A 1.0’’ Figure 4.
PAGE 12
MAX98400A Evaluation Kit Evaluates: MAX98400A Revision History REVISION NUMBER REVISION DATE 0 8/10 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.