19-4038; Rev 0; 2/08
MAX9725E Evaluation Kit
vluates:–MAX9725E
General Description
Features
♦ No DC-Blocking Output Capacitors Required
♦ 0.9V to 1.8V Operation
The MAX9725E evaluation kit (EV kit) is a fully assem-
bled and tested printed-circuit board (PCB) that uses
the MAX9725E IC to drive a stereo headphone in
portable applications. The MAX9725E is a low-power
stereo headphone amplifier with adjustable gain and
DirectDrive™ outputs. Maxim’s DirectDrive technology
eliminates the need for bulky DC-blocking capacitors at
the output of the amplifier.
♦ Adjustable -1.82V/V Gain
♦ 20mW per Channel into a 32ΩΩ Load
♦ Low 0.006% THD+N
The EV kit is configured for a -1.82V/V gain and is
designed to operate from a 0.9V to 1.8V DC power sup-
ply. The EV kit is capable of delivering up to 20mW per
channel into a 32Ω load and achieves 0.006% THD+N.
♦ Fully Assembled and Tested
The MAX9725E EV kit can also be used to evaluate the
MAX9725A, MAX9725B, MAX9725C, or MAX9725D
fixed-gain amplifiers. Contact Maxim for free samples of
the MAX9725A, MAX9725B, MAX9725C, or MAX9725D.
See the Part Selection Table for IC ordering information.
The MAX9725_ IC temperature range is -40°C to +85°C.
Part Selection Table
Ordering Information
PART
TYPE
PART
GAIN
MAX9725EEVKIT+
EV Kit
MAX9725AEBC+
MAX9725BEBC+
MAX9725CEBC+
MAX9725DEBC+
MAX9725EEBC+
-2
-1.5
+Denotes lead-free and RoHS-compliant.
-1
-4
Adjustable
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
1µF 10%, 10V X5R ceramic
capacitors (0603)
Murata GRM188R61A105K
OUTL, OUTR,
C1, C2, C3, C5,
0
Not installed, test points
5
SGND
C6
R1, R2, R5
R3, R4
3
2
10kΩ 1% resistors (0603)
18.2kΩ 1% resistors (0603)
4.7µF 10%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J475K
C4
1
3
Fixed-gain, stereo headphone
amplifier (12-bump UCSP™,
1.54mm x 2.02mm x 0.6mm)
Maxim MAX9725EEBC+
120Ω at 100MHz, 25mΩ DCR, 3A
ferrite beads (0603)
Murata BLM18SG121TN1
U1
1
FB1, FB2, FB3
—
—
1
1
Shunt (JU1)
JU1
1
1
2-pin header
PCB: MAX9725E Evaluation Kit+
OUT
Stereo headphone jack (3.5mm)
Component Supplier
SUPPLIER
Murata Mfg. Co., Ltd.
PHONE
WEBSITE
770-436-1300
www.murata.com
Note: Indicate that you are using the MAX9725E when contacting this component supplier.
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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.