General Description
The MAX4411 evaluation kit (EV kit) is a fully assembled
and tested surface-mount circuit board that evaluates
the MAX4411 fixed gain, DirectDrive™ stereo head-
phone amplifier. The DirectDrive architecture of the
MAX4411 eliminates the two large DC-blocking capaci-
tors typically required between the output of the amplifi-
er and the headphones. Additionally, the gain of the
amplifier is set internally, (-1.5V/V, MAX4411 and -2V/V,
MAX4411B) further reducing component count.
Features
♦No Bulky DC-Blocking Capacitors Required
♦Fixed Gain Eliminates External Feedback Network
MAX4411: -1.5V/V
MAX4411B: -2V/V
♦1.8V to 3.6V Single-Supply Operation
♦80mW Per Channel into 16Ω
♦Low 0.003% THD+N at 1kHz
♦Independent Left/Right, Low-Power Shutdown
Controls
♦Ultra-Compact Solution
♦Fully Assembled and Tested Surface-Mount Board
Evaluates: MAX4411
MAX4411 Evaluation Kit
________________________________________________________________ Maxim Integrated Products 1
19-3392; Rev. 0; 10/04
Component List
DESIGNATION QTY
DESCRIPTION
C1, C2, C3
3
2.2µF ±10%, 6.3V X5R ceramic
capacitors (0603)
TDK C1608X5R0J225K
Taiyo Yuden JMK107BJ225KA
C4
1
10µF ±20%, 6.3V X5R ceramic
capacitor (0805)
TDK C2012X5R0J106M
Taiyo Yuden JMK212BJ106MG
C5
1
0.1µF ±10%, 16V X7R ceramic
capacitor (0603)
TDK C1608X7R1C104K
Taiyo Yuden EMK107BJ104KA
DESIGNATION QTY DESCRIPTION
C6, C7 2
1.0µF ±10%, 16V tantalum capacitors
(A-case)
AVX TAJA105K016R
J1 1 Stereo headphone jack (3.5mm dia.)
JU1, JU2 2 3-pin headers
None 2 Shunts
R1, R2 2 10kΩ ±1% resistors (0603)
U1 1 MAX4411ETP (20-pin TQFN,
4mm x 4mm x 0.8mm)
None 1 MAX4411 EV kit PC board
None 1 MAX4411 EV kit data sheet
None 1 MAX4411 data sheet
Ordering Information
PART TEMP RANGE
IC PACKAGE
MAX4411EVKIT
0°C to +70°C20 Thin QFN
Component Suppliers
SUPPLIER PHONE FAX WEBSITE
AVX 843-946-0238 843-626-3123 www.avxcorp.com
Taiyo Yuden 800-348-2496 847-925-0899 www.t-yuden.com
TDK 847-803-6100 847-390-4405 www.component.tdk.com
Note: Indicate that you are using the MAX4411 when contacting these component suppliers.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Evaluates: MAX4411
MAX4411 Evaluation Kit
2_______________________________________________________________________________________
Quick Start
Recommended Equipment
•One pair of 16Ωor 32Ωheadphones
•One variable DC power supply capable of supplying
between 1.8V and 3.6V at 300mA
•One stereo audio source
Procedure
The MAX4411 EV kit is fully assembled and tested.
Follow the steps below to verify board operation. Do not
turn on the power supply until all connections are com-
pleted:
1) Verify that shunts are installed across pins 1 and 2 of
jumpers JU1 and JU2.
1) Plug the headphones into the 3.5mm headphone
jack.
3) Ensure that the stereo audio source is turned off.
4) Connect the disabled audio source between IN_ and
GND.
5) Connect the 1.8V to 3.6V DC power supply to the
VDD and GND pads.
6) Turn on the DC power supply.
7) Enable the stereo audio source.
Detailed Description
The MAX4411 is a fixed-gain, stereo headphone ampli-
fier featuring Maxim’s patented DirectDrive architec-
ture. The device consists of two 80mW Class AB head-
phone amplifiers, an internal feedback network, under-
voltage lockout (UVLO)/shutdown control, a charge
pump, and comprehensive click-and-pop suppression
circuitry.
The MAX4411 EV kit has an internal gain of -1.5V/V and
can be powered with a 1.8V to 3.6V single supply. The
MAX4411 EV kit can be used to evaluate the
MAX4411B. The MAX4411B has an internal -2V/V gain.
To evaluate the MAX4411B, request a MAX4411BETP
free sample with the MAX4411 EV kit.
Shutdown Control
The MAX4411 EV kit provides two shutdown pins
(SHDNL and SHDNR) to disable the outputs, allowing
each channel to be shut down independently. Jumpers
JU1 and JU2 control the left and right channels,
respectively (see Table 1 for shutdown shunt positions).
Shorting pin 2 of JU1 to pin 2 of JU2 allows the user to
control both channels’ shutdown pins simultaneously by
driving the provided user pad SHDN with an external
source (see Figure 1 for shunt configuration). SHDNL
and SHDNR are CMOS logic-level inputs.
Layout Considerations
To optimize the audio performance of the MAX4411, it
is important to follow these layout guidelines. The
MAX4411 EV kit uses two ground planes to minimize
switching noise from the charge-pump coupling into the
audio signal. The two planes are star-connected at one
point (GND pad). Capacitors C1, C2, and C3 should be
placed close to the IC. Short, wide traces should be
used to connect the power pins of the IC to the power
supply.
Note: Capacitors C1 and C2 can be reduced in size.
See Figure 3 and the MAX4411 data sheet for details.
Table 1. Shutdown Selection
JUMPER SHUNT
POSITION DESCRIPTION
1–2 Left channel enabled
JU1 2–3 Left channel disabled
1–2 Right channel enabled
JU2 2–3 Right channel disabled
JU1 JU2
1
2
3
1
2
3
Figure 1. Simultaneous Shutdown Control
Evaluates: MAX4411
MAX4411 Evaluation Kit
_______________________________________________________________________________________ 3
C6
1µF15
INR INR
INL
N.C.
N.C.
N.C.
OUTR
OUTL
PVDD
VDD
SVDD
SHDNR SHDNR
JU2
SVSS
PVSS
+-
C7
1µF
C4
10µF
C3
2.2µF
C5
0.1µF
C2
2.2µF
C1
2.2µF
R2
10kΩ
13
4
19
10
75 6 119
14
12
18
1720321
TP1
TP2
TP3
INL
VDD
GND
+-
VDD
VDD
SHDNL SHDNL
JU1
R1
10kΩ
VDD
N.C. 8
N.C.
N.C.
C1N
PGDN
C1P
SGND
16
MAX4411
U1
1
2
3
3
2
1
Figure 2. MAX4411 EV Kit Schematic
Figure 3. Output Power vs. C1 and C2 Figure 4. MAX4411 EV Kit Component Placement Guide—
Component 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.
4_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
©2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Evaluates: MAX4411
MAX4410 Evaluation Kit
Figure 5. MAX4411 EV Kit PC Board Layout—Component Side Figure 6. MAX4411 EV Kit Component Placement Guide—
Solder Side
Figure 7. MAX4411 EV Kit PC Board Layout—Solder Side