Quick Start

Required Equipment

•

One pair of 8Ω to 32Ω headphones

•

One variable DC power supply capable of supply-

ing between 4V and 5.5V at 500mA

•

One stereo audio source

Procedure

The MAX13331 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) Plug the headphones into the 3.5mm headphone

jack (J1).

2) Ensure that the stereo audio source is turned off.

3) Connect the disabled stereo audio source through

the RCA phono jacks (P1 and P2).

4) Ensure that a shunt is installed on jumper JU1.

5) Connect the 4V to 5.5V DC power supply to the

VDD and PGND pads.

6) Turn on the DC power supply.

7) Verify that the audio source level is low.

8) Enable the stereo audio source.

9) Verify that the audio source signal is clearly heard

from the headphones.

Detailed Description of Hardware

The MAX13331 EV kit is a stereo, single-supply head-

phone amplifier. The input impedance is 15kΩ. The

-3dB corner frequencies are approximately 10Hz and

greater than 22kHz and are dependent on components

R1/C1 and R2/C2. The MAX13331 EV kit has a gain of

approximately 1.5 and can be powered with a 4V to

5.5V supply

The EV kit provides two RCA phono jacks (P1 and P2)

to facilitate the connection of an audio source. In addi-

tion, both outputs (OUTL and OUTR) are routed to a

stereo headphone jack (J1), facilitating output monitor-

ing. Shutdown control of OUTL and OUTR is also pro-

vided through jumper JU1.

Shutdown Control

The MAX13331 EV kit provides jumper JU1 to disable

the outputs, OUTL and OUTR (see Table 1 for shut-

down shunt positions). Both OUTL and OUTR are rout-

ed to the headphone jack (J1).

Layout Considerations

To optimize the audio performance of the MAX13331, it is

important to follow these layout guidelines. The MAX13331

EV kit uses two ground planes to minimize switching noise.

The two planes are star-connected at one point (JU2 pad).

Capacitors C5, C6, C8, C12, C13, and C14 should be

placed close to the IC. Refer to the MAX13331 IC data

sheet for additional layout considerations.

The MAX13331 EV kit is a four-layer design, but it is

possible to design the MAX13331 circuit on to a two-

layer board. For a two-layer design, optimize the signal

and power ground planes by maximizing the area and

connecting each plane, as close as possible, to its

respective IC pin.

MAX13331 Evaluation Kit

2

_______________________________________________________________________________________

SUPPLIER

PHONE

WEBSITE

Murata Electronics North America, Inc.

770-436-1300

www.murata-northamerica.com

TDK Corp.

847-803-6100

www.component.tdk.com

Component Suppliers

Note: Indicate that you are using the MAX13331 when contacting these component suppliers.

Table 1. Jumper JU1 Function

SHUNT POSITION

DESCRIPTION

Installed

Outputs enabled

Not installed

Outputs disabled