MAX98500EVKIT+ Datasheet MAX98500EVKIT+ | P1-P3

_______________________________________________________________ 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.

MAX98500 Evaluation Kit

Evaluates: MAX98500

General Description

The MAX98500 evaluation kit (EV kit) is a fully assembled

and tested circuit board that uses the MAX98500 boost-

ed Class D amplifier to drive a mono bridge-tied-load

(BTL) speaker in portable audio applications. Designed

to operate from a 2.5V to 5.5V DC power supply, the EV

kit delivers 2.2W into an 8I load. The EV kit accepts

differential or single-ended input signals, features three

selectable gain settings (6dB, 15.5dB, and 20dB), and

provides separate speaker and boost shutdown inputs.

Features

S 2.5V to 5.5V Single-Supply Operation

S Output Power: 2.2W into 8ω, 10% THD+N

S Selectable Gain Settings (6dB, 15.5dB, and 20dB)

S Boosted Class D Output

S Differential or Single-Ended Input Signals

S Boost Converter Shutdown

S Speaker Output Shutdown

S Fully Assembled and Tested

Ordering Information

Component List

19-5221; Rev 0; 5/10

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

PART TYPE

MAX98500EVKIT+ EV Kit

DESIGNATION QTY DESCRIPTION

REQUIRED COMPONENTS

C1 1

10FF Q10%, 6.3V X7R ceramic

capacitor (0805)

Murata GRM21BR70J106K

TDK C2012X7R0J106K

C2 1

22FF Q20%, 16V X5R ceramic

capacitor (1206)

Murata GRM31CR61226M

Taiyo Yuden EMK316BJ226M

C3, C4 2

1FF Q10%, 25V X7R ceramic

capacitors (0603)

Murata GRM188R71E105K

Murata GRM188R71E105M

C5 1

22FF Q10%, 6.3V X5R ceramic

capacitor (0805)

Murata GRM21BR60J226M

TDK C2012X5R0J226K

C8 1

0.1FF Q10%, 16V X7R ceramic

capacitor (0402)

Murata GRM155R71C104K

TDK C1005X7R1C104K

C9, C10 0

Not installed, ceramic capacitors

(0402)

C12, C13 0

Not installed, ceramic capacitors

(0603)

DESIGNATION QTY DESCRIPTION

C14–C18 5

0.22FF Q10%, 25V X7R ceramic

capacitors (0603)

Murata GRM188R71E224K

TDK C1608X7R1E224K

FB1 1

0I resistor (0603)

FB2, FB3 0 Not installed, ferrite beads (0603)

J1 1

Phono jack, black (side-entry

PCB mount)

JU1, JU2, JU3 3 3-pin headers

JU4 1 2-pin header

L1 1

2.2FH, 34mI, 4.5A inductor

TOKO FDV0530S-2R2M

(5mm x 5mm x 3mm)

TDK LTF5022T-2R2N3R2-LC

(5mm x 5mm x 2.2mm)

NEC MPLC0525L2R2

(5.2mm x 6.2mm x 2.5mm)

L2, L3 0

Not installed, inductors

TOKO A916CY-220M (provided

with EV kit)

OUT-, OUT+,

PGND, RKNEE

4 Test points

R1 1

27.4kω Q1% resistor (0603)

R2, R3 2

22ω Q5% resistors (0603)

MAX98500 Evaluation Kit

Evaluates: MAX98500

2 ______________________________________________________________________________________

Quick Start

Recommended Equipment

• 2.5Vto5.5V,4ADCpowersupply

• 8I speaker

• Monoaudiosignalsource

Procedure

The MAX98500 EV kit is fully assembled and test-

ed. Follow the steps below to verify board operation.

Caution: Do not turn on the power supply until all

connections are completed.

1) Verify that shunts are installed as follows:

JU1: Open (15.5dB gain)

JU2: Pins 1-2 (speaker enabled)

JU3: Pins 1-2 (boost enabled)

JU4: Short (single-ended/unbalanced input)

2) Set the power-supply output to 3.6V.

3) Disable the power-supply output.

4) Connect the power-supply ground to the PGND pad

and the power-supply positive output to the VBAT

pad on the EV kit. Keep VBAT lengths < 6in and

twisted to minimize inductance, to ensure proper

device operation.

5) Verify that the audio source output is disabled.

6) Connect the mono audio source between the IN+

and IN- pads or J1 on the EV kit.

7) Connect the speaker across the OUT+ and OUT-

test points.

8) Enable the power-supply output.

9) Enable the audio source.

10) Verify that the speaker is playing the audio source

signal.

Detailed Description of Hardware

The MAX98500 EV kit features the MAX98500 boosted

Class D amplifier IC, designed to drive a BTL mono

speaker in portable audio applications. The EV kit

accepts a differential or single-ended audio input, fea-

tures three selectable gain settings (6dB, 15.5dB, and

20dB), and provides two active-low shutdown inputs for

flexibility. The audio input source is amplified to drive

2.2W into an 8I speaker. The EV kit operates from a

single DC power supply that provides 2.5V to 5.5V.

The EV kit provides two sets of differential outputs. The

device outputs (OUT+ and OUT-) can be connected

directly to a speaker load without any filtering. However,

a filter can be added to ease evaluation.

Component List (continued)

Component Suppliers

Note: Indicate that you are using the MAX98500 when contacting these component suppliers.

DESIGNATION QTY DESCRIPTION

U1 1

Boosted Class D amplifier

(16 WLP)

Maxim MAX98500EWE+

VCCOUT 0 Not installed, test point

— 4 Shunts

— 1

PCB: MAX98500 EVALUATION

KIT+

DESIGNATION QTY DESCRIPTION

OPTIONAL COMPONENTS

L2, L3 2

22FH Q20%, 0.7A inductors

(D63CB)

TOKO A916CY-220M

SUPPLIER PHONE WEBSITE

Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com

NEC TOKIN America, Inc. 408-324-1790 www.nec-tokinamerica.com

TDK Corp. 847-803-6100 www.component.tdk.com

TOKO America, Inc. 847-297-0070 www.tokoam.com

MAX98500 Evaluation Kit

Evaluates: MAX98500

_______________________________________________________________________________________ 3

*Default position.

Selectable Gain Setting

The MAX98500 features three internal gain settings that

are selectable with the GAIN input. Jumper JU1 controls

the amplifier’s gain select input. See Table 1 for jumper

JU1 configuration.

Shutdown Inputs

The MAX98500 features two active-low shutdown inputs

(SDSPK and SDBST). Jumper JU2 enables or disables

the speaker amplifier (SDSPK) and jumper JU3 controls

the boost converter (SDBST). See Table 2 for jumpers

JU2 and JU3 configuration. Note that the boost must be

enabled for the speaker amplifier to enable.

Input Mode

Jumper JU4 provides the option to select between a dif-

ferential or single-ended input mode for the EV kit. See

Table 3 for JU4 configuration.

Optional Output Filtering

The MAX98500 speaker amplifier is designed to pass

FCC emissions standards without any filtering. When

evaluating the MAX98500 without any filtering, connect

the speaker to the output test points (OUT+, OUT-).

The EV kit also features PCB pads for a lowpass filter

that can be added to ease evaluation. Audio analyzers

typically cannot accept the Class D amplifier’s pulse-

width-modulated (PWM) waveform at their inputs. The

lowpass filter extracts the audio content from the PWM

output signal and allows the device to be connected

directly to an audio analyzer. The PWM output signal

can be lowpass-filtered by simply installing L2 and L3;

all other components are populated. The filtered outputs

should then be monitored at the FOUT+/FOUT- pads.

See Table 4 for suggested filtering components for an

8I load.

Table 1. Gain Input (JU1) Table 3. Input Mode (JU4)

Table 2. Shutdown Configuration

(JU2, JU3)

Table 4. Suggested Filtering Components

for 8I Load

SHUNT

POSITION

GAIN PIN

GAIN SETTING

(dB)

2-3 Connected to AGND 6

Not installed* Unconnected 15.5

1-2 Connected to VBAT 20

SHUNT

POSITION

IN- PIN INPUT MODE

Installed* Connected to AGND

Single-ended/

unbalanced input

Not installed

Connected to user-

supplied negative

differential output

Differential input

SDSPK PIN

(JU2)

SDBST PIN

(JU3)

BOOST

STATUS

SPEAKER

STATUS

2-3 (low) 2-3 (low) Off Off

1-2 (high) 2-3 (high) Off Off

2-3 (low) 1-2 (low) On Off

1-2* (high) 1-2* (high) On On

DESIGNATION QTY DESCRIPTION

L2, L3 2

22FH Q20%, 0.7A inductor

(D63CB)

TOKO A916CY-220M

P1-P3 P4-P6

MAX98500EVKIT+

Mfr. #:

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Manufacturer:

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MAX98500EVKIT+