19-4470; Rev 0; 2/09
MAX9892 Evaluation Kit
General Description
The MAX9892 evaluation kit (EV kit) is an assembled
and tested PCB that evaluates the MAX9892 IC.
The MAX9892 is an audio click-and-pop eliminator IC.
The EV kit circuit includes an on-board MAX4338 head-
phone amplifier, two RCA audio input jacks, and a
headphone jack to demonstrate the performance of the
MAX9892. The EV kit operates from a 2.7V to 5.5V DC
power supply.
The MAX9892 EV kit can also eliminate the audible
clicks and pops of an external headphone amplifier
connected to the EV kit. When utilizing an external
headphone amplifier, the MAX9892 EV kit can operate
from a lower input-voltage range of 1.7V to 5.5V DC.
Features
o
2.7V to 5.5V DC Single-Supply Operation (On-
Board Headphone Amplifier)
o
1.7V to 5.5V DC Single-Supply Operation (External
Headphone Amplifier)
o
Proven Audio PCB Layout
o
On-Board MAX4338 Headphone Amplifier
o
RCA Audio Input Jacks
o
Headphone Output Jack
o
PCB Pads for Audio Input and Output Signals
o
Evaluates the MAX9892ERT+ in a 6-Bump UCSP™
(2 x 3 Array) Package
o
Lead(Pb)-Free and RoHS Compliant
o
Fully Assembled and Tested
Evaluates: MAX9892
Ordering Information
PART
MAX9892EVKIT+
TYPE
EV Kit
UCSP is a trademark of Maxim Integrated Products, Inc.
+Denotes
lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION
C1
QTY
1
DESCRIPTION
0.1μF ±10%, 10V X5R ceramic
capacitor (0603)
Murata GRM188R61E104K
560pF ±5%, 50V C0G ceramic
capacitor (0603)
Murata GRM1885C1H561J
1μF ±10%, 6.3V X5R ceramic
capacitor (0402)
Murata GRM155R60J105K
0.1μF ±10%, 6.3V X5R ceramic
capacitor (0402)
Murata GRM155R60J104K
0.47μF ±10%, 6.3V X5R ceramic
capacitors (0402)
Murata GRM155R60J474K
100pF ±5%, 50V C0G ceramic
capacitors (0402)
Murata GRM1555C1H101J
220μF ±20%, 6.3V tantalum
capacitors (C case)
AVX TPSC227M006R0125
Not installed, test points
3.5mm stereo headphone jack
(SMT, 3 position, non switch)
DESIGNATION
JU1, JU4
JU2, JU3, JU5
LIN
RIN
R1
R2
R3–R7
R8, R9
R10, R11
R12, R13
R14, R15
QTY
2
3
1
1
1
1
5
2
2
2
0
DESCRIPTION
3-pin headers
2-pin headers
RCA phono jack, white (side
entry, PCB mount)
RCA phono jack, red (side entry,
PCB mount)
100k
180k
100k
22.1k
47.5k
30
±5% resistor (0603)
±5% resistor (0603)
±5% resistors (0402)
±1% resistors (0402)
±1% resistors (0402)
C2
1
C3
1
C4
1
C5, C6
2
±5% resistors (0603)
Not installed, resistors (0603)
Audio click-and-pop
eliminator (6 UCSP)
Maxim MAX9892ERT+T
(Top Mark: AAE)
Headphone amplifier (10 μMAX
®
)
Maxim MAX4338EUB+
Shunts (JU1–JU5)
PCB: MAX9892 Evaluation Kit+
C7, C8
2
U1
1
C9, C10, C11
GND, INL, INR
HPOUT
3
0
1
U2
—
—
1
5
1
µMAX is a registered trademark of Maxim Integrated Products, Inc.
1
________________________________________________________________
Maxim Integrated Products
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.
MAX9892 Evaluation Kit
Evaluates: MAX9892
Component Suppliers
SUPPLIER
AVX Corporation
PHONE
WEBSITE
843-946-0238 www.avxcorp.com
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.
Murata Electronics
770-436-1300 www.murata-northamerica.com
North America, Inc.
Note:
Indicate that you are using the MAX9892 when contacting
these component suppliers.
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.
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.
2
_______________________________________________________________________________________
MAX9892 Evaluation Kit
Evaluates: MAX9892
Table 1. JU1 Jumper Selection (VCC/VDD)
SHUNT
POSITION
1-2*
2-3
Not installed
POWER SUPPLY
CONNECTED TO
VCC PCB pad
(VCC = 2.7V to 5.5V DC)
VDD PCB pad
(VDD = 1.7V to 5.5V DC)
Unconnected
HEADPHONE
AMPLIFIER
On-board**
External
MAX9892 EV kit
(not powered)
Table 2. JU2, JU3 Jumpers Function
(HPL, HPR)
SHUNT
POSITION
Installed*
Not installed
HEADPHONE AMPLIFIER OUTPUTS
On-board headphone amplifier (MAX4338)
External headphone amplifier (connected to
HPL, HPR, and GND PCB pads)
*Default
position.
*Default
position.
**MAX4338
limits the lower input range to 2.7V.
Headphone Amplifier Outputs (HPL, HPR)
When operating with the on-board headphone amplifi-
er, the MAX9892 IC receives the headphone output sig-
nal from the on-board headphone amplifier. When oper-
ating with an external headphone amplifier, the
MAX9892 IC receives the external headphone amplifier
output signal connected to the HPL, HPR, and GND
PCB pads on the MAX9892 EV kit.
Jumpers JU2 and JU3 provide an option to select
between the on-board or external headphone amplifier
outputs for the MAX9892 EV kit. Table 2 lists the selec-
table jumper options for JU2 and JU3.
Mute and Shutdown Inputs (MUTE,
SHDN1,
SHDN2,
and
SHDN)
When operating with the on-board headphone amplifi-
er, connect the MAX9892
MUTE
pin to the
SHDN1
and
SHDN2
pins of the on-board MAX4338 headphone
amplifier. When operating with an external headphone
amplifier, connect the MAX9892
MUTE
pin to the
SHDN
PCB pad on the MAX9892 EV kit. After the desired
shutdown signal is properly connected to the MAX9892
MUTE
pin, use the MAX9892
MUTE
pin to start up or
shut down the headphone amplifier to demonstrate the
performance of the MAX9892 IC.
Jumper JU4 selects between the on-board or external
headphone amplifier shutdown input for the MAX9892
EV kit. Jumper JU5 pulls the MAX9892
MUTE
pin to
ground to initiate shutdown for the headphone amplifier
selected by jumper JU4. Table 3 lists the jumper
options for JU4 and JU5.
Table 3. JU4, JU5 Jumpers Function (MUTE)
SHUNT POSITION
JU4
1-2*
2-3
JU5
Installed
Not installed
Installed
MAX9892
MUTE
PIN CONNECTED TO
HEADPHONE AMPLIFIER OUTPUTS
Enabled (on-board)
Disabled (on-board)
Enabled (external)
Disabled (external)
Not installed* MAX4338 shutdown pins and VCC through resistor R5
MAX4338 shutdown pins and GND
SHDN
PCB pad and external pulled up
SHDN
PCB pad and GND
*Default
position.
_______________________________________________________________________________________
3
MAX9892 Evaluation Kit
Evaluates: MAX9892
Figure 1. MAX9892 EV Kit Schematic
4
_______________________________________________________________________________________
MAX9892 Evaluation Kit
Evaluates: MAX9892
Figure 2. MAX9892 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX9892 EV Kit PCB Layout—Component Side
Figure 4. MAX9892 EV Kit PCB Layout—Solder Side
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________
5
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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