Datasheet
Evaluates: MAX9892
MAX9892 Evaluation Kit
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Quick Start
Required Equipment
Before beginning, the following equipment is needed:
• MAX9892 EV kit
• 2.7V to 5.5V, 100mA DC power supply
• One stereo audio source
• One pair of headphones
Procedure
The MAX9892 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 a shunt is installed on pins 1-2 of jumper
JU1. This configures the EV kit to accept power for
both the MAX9892 and the on-board MAX4338
headphone amplifier.
2) Verify that shunts are installed on jumpers JU2 and
JU3. This configures the MAX9892 to accept the
on-board MAX4338 headphone amplifier outputs.
3) Verify that a shunt is installed on pins 1-2 of jumper
JU4. This connects the MAX9892’s MUTE pin to the
MAX4338 SHDN1 and SHDN2 pins.
4) Verify that a shunt is not installed on jumper JU5.
This enables the on-board MAX4338 headphone
amplifier outputs.
5) Connect the audio source outputs to the LIN and
RIN RCA jacks.
6) Connect the headphone to the HPOUT headphone
jack.
7) Connect the power supply across the VCC and
GND PCB pads.
8) Turn on the audio source. Turn on the power supply
and set the supply voltage to 5V.
9) Verify that audible click or pop sounds are not
detected while removing and reinstalling the shunt
on jumper JU5.
Detailed Description of Hardware
The MAX9892 EV kit evaluates the MAX9892 IC, an
audio click-and-pop eliminator in a 6-bump UCSP
package. The MAX9892 provides low-impedance paths
to ground for headphone amplifier outputs during start-
up and shutdown to eliminate audible clicks and pops.
The EV kit features an on-board MAX4338 headphone
amplifier, two RCA audio input jacks, and a headphone
jack to demonstrate the performance of the MAX9892.
When utilizing the on-board headphone amplifier, the
EV kit operates from a 2.7V to 5.5V DC power supply
connected to the VCC and GND pads.
The MAX9892 also eliminates audible click-and-pop
sounds from an external headphone amplifier connect-
ed to the EV kit. To eliminate the audible clicks and
pops from an external headphone amplifier, connect
the external headphone amplifier outputs to the HPL,
HPR, and GND PCB pads on the EV kit. Connect the
external headphone amplifier shutdown signal(s) to the
SHDN PCB pad, and the external headphone amplifier
ground to the GND pad on the MAX9892 EV kit. See
the
Jumper Selection
section to reconfigure jumpers
JU1–JU4. The MAX9892 can operate from a lower
input-voltage range of 1.7V to 5.5V DC connected
between the VDD and GND PCB pads when operating
with an external headphone amplifier.
Jumper Selection
The MAX9892 EV kit can be configured to operate with
an on-board headphone amplifier or an external head-
phone amplifier. Use jumpers JU1–JU4 to select
between on-board or external headphone amplifier
operation for the MAX9892 EV kit.
MAX9892 EV Kit Power Supply (VCC/VDD)
When operating with the on-board headphone amplifi-
er, the EV kit requires a single DC power supply with an
input-voltage range between 2.7V and 5.5V connected
between the VCC and GND pads. When operating with
an external headphone amplifier, the MAX9892 EV kit
can operate at a lower input-voltage range of 1.7V to
5.5V connected between the VDD and GND pads.
Jumper JU1 configures the input power supply for the
MAX9892 EV kit. Table 1 lists the selectable jumper
options for JU1.
Component Suppliers
SUPPLIER PHONE WEBSITE
AVX Corporation 843- 946- 0238 www.avxcorp.com
M urata E l ectr oni cs
N orth Am er ica, Inc.
770- 436- 1300 w ww .m ur ata- nor tham er ica.com
Note: Indicate that you are using the MAX9892 when contacting
these component suppliers.