Datasheet

SUPPLIER PHONE WEBSITE
Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com
Taiyo Yuden 800-348-2496 www.t-yuden.com
TDK Corp. 847-803-6100 www.component.tdk.com
TOKO America, Inc. 847-297-0070 www.tokoam.com
SHUNT
POSITION
GAIN PIN
GAIN SETTING
(dB)
2-3 Connected to AGND +6
Not installed* Unconnected +15.5
1-2 Connected to VBAT +20
_________________________________________________________________ Maxim Integrated Products 2
MAX98502 Evaluation Kit
Evaluates: MAX98502
Quick Start
Recommended Equipment
• MAX98502 EV kit
• 2.5Vto5.5V,4ADCsupply
• 8I or 4I speaker
• Monoaudiosignalsource
Procedure
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 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 PCB
pad and the power-supply positive output to the
VBAT PCB pad on the EV kit. Keep VBAT lengths <
8in (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- PCB 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 MAX98502 EV kit features the MAX98502 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, features three
selectable gain settings, and provides two active-low
shutdown inputs for flexibility. The audio input source is
amplified to drive 2.2W into an 8I speaker or 4W into an
4I speaker. The EV kit operates from a single DC power
supply that can provide 2.5V to 5.5V.
The EV kit provides two sets of differential outputs. The
device outputs (OUT+/OUT-) can be connected directly
to a speaker load, without any filtering, with up to 24in of
cable. However, a filter can be added to ease evaluation.
Selectable Gain Setting
The IC 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 JU1 con-
figuration.
Shutdown Inputs
The IC 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 JU2 and JU3
configuration. The boost must be enabled for the speaker
amplifier to enable.
Component Suppliers
Note: Indicate that you are using the MAX98502 when contacting these component suppliers.
Table 1. GAIN Input (JU1)
*Default position.