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MAX98400B Evaluation Kit

Evaluates: MAX98400B

General Description

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 set-

tings 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, dem-

onstrating 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 shut-

down 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

Component List

19-5505; Rev 0; 9/10

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

PART TYPE

MAX98400BEVKIT+ 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- 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+

Summary of content (12 pages)

PAGE 1
9-5505; 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.
PAGE 2
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) Würth 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.
PAGE 3
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.
PAGE 4
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).
PAGE 5
MAX98400B Evaluation Kit JUMPER SHUNT POSITION 1-2* SHDN_2 DESCRIPTION Normal operation; U2 SHDN = DVDD (external logic high) Table 3.
PAGE 6
Evaluates: MAX98400B MAX98400B Evaluation Kit Figure 1a.
PAGE 7
MAX98400B Evaluation Kit Evaluates: MAX98400B Figure 1b.
PAGE 8
Evaluates: MAX98400B MAX98400B Evaluation Kit Figure 1c.
PAGE 9
MAX98400B Evaluation Kit Evaluates: MAX98400B Figure 2.
PAGE 10
Evaluates: MAX98400B MAX98400B Evaluation Kit Figure 3.
PAGE 11
MAX98400B Evaluation Kit Evaluates: MAX98400B Figure 4.
PAGE 12
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.