_______________________________________________________________ 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.
MAX97220A Evaluation Kit
Evaluates: MAX97220A–MAX97220D
General Description
The MAX97220A evaluation kit (EV kit) is a fully assembled
and tested circuit board that evaluates the MAX97220A
differential input DirectDrive® line driver/headphone
amplifier. The device is capable of driving 125mW into
32I, or 3VRMS into 600I load, with a 5V supply.
The EV kit provides an externally set gain, is
powered from a 2.5V to 5.5V single power supply,
and includes a shutdown input. The EV kit also evalu-
ates the MAX97220B, MAX97220C, and MAX97220D
devices. Request a free MAX97220B, MAX97220C, and/
or MAX97220D IC sample from the factory when ordering
the EV kit.
Features
S 2.5V to 5.5V Single-Supply Operation
S 3VRMS Output Drive Into 600ω Load
S 125mW Headphone Amplifier
S Fully Differential Inputs
S Externally Adjustable Gain
S Low-Power Shutdown Input
S Evaluates the MAX97220B, MAX97220C, and
MAX97220D (with IC Replacement)
S Fully Assembled and Tested
Ordering Information
19-5662; Rev 0; 12/10
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
Component Suppliers
Note: Indicate that you are using the MAX97220_ when contacting these component suppliers.
PART TYPE
MAX97220AEVKIT+ EV Kit
DESIGNATION QTY DESCRIPTION
C1, C2, C7 3
0.1FF Q10%, 25V X7R ceramic
capacitors (0603)
Murata GRM188R71E104K
TDK C1608X7R1E104K
C3–C6 4
0.47FF Q10%, 25V X7R ceramic
capacitors (0603)
Murata GRM188R71E474K
TDK C1608X5R1E474K
C8, C9 2
1FF Q10%, 10V X7R ceramic
capacitors (0603)
Murata GRM188R71C105K
TDK C1608X7R1C105K
C10 1
10FF Q20%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J106M
TDK C1608X5R0J106M
DESIGNATION QTY DESCRIPTION
C11–C16 0 Not installed, ceramic capacitors
(0603)
HP_OUT 1 3.5mm stereo headphone jack
JU1 1 2-pin header
OUTL, OUTR,
GND 3 Test points
OUTL 1 White headphone jack
OUTR 1 Red headphone jack
R1–R8 8 10kI Q1% resistors (0603)
R9 1 100kI Q5% resistor (0603)
U1 1
Differential input headphone
amplifier (16 TQFN)
Maxim MAX97220AETE+
— 1 Shunts
— 1 PCB MAX97220A EVALUATION
KIT+
SUPPLIER PHONE WEBSITE
Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com
TDK Corp. 847-803-6100 www.component.tdk.com
MAX97220A Evaluation Kit
Evaluates: MAX97220A–MAX97220D
2 ______________________________________________________________________________________
Quick Start
Recommended Equipment
• MAX97220A EV kit
• 2.5V to 5.5V DC supply
• Stereo audio signal source
• Pair of stereo headphones
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 a shunt is installed across jumper JU1
(device enabled).
2) Set the power-supply output to 5V.
3) Disable the power-supply output.
4) Connect the power-supply ground to the GND pad
and the power-supply positive output to the VDD
pad on the EV kit.
5) Connect headphones to the stereo headphone jack
(HP_OUT) provided on the EV kit.
6) Verify that the audio source output is disabled.
7) Connect the left output of the audio source to the
INL- pad.
8) Connect the ground of the audio source to the INL+
pad.
9) Connect the right output of the audio source to the
INR- pad.
10) Connect the ground of the audio source to the INR+
pad.
11) Enable the stereo audio source.
12) Enable the power-supply output.
13) Verify that the headphones are playing the audio
source signal.
Detailed Description
The MAX97220A EV kit features the MAX97220A differen-
tial stereo headphone driver with DirectDrive, designed
to directly drive a 125mW into a 32I stereo headphone.
The EV kit operates from a DC power supply that can
provide 2.5V to 5.5V and accepts two sets of differential
audio inputs.
Headphone Amplifier Shutdown
Jumper JU1 enables or disables the headphone ampli-
fier. See Table 1 for jumper JU1 configuration.
MAX97220C/MAX97220D Usage
When replacing the MAX97220A with either the
MAX97220C or MAX97220D, several external compo-
nents must be changed. R1–R4 should be replaced with
0ω resistors. R5–R8 should be removed from the PCB.
C11–C16 should be left uninstalled (same as the default
EV kit setting).
Table 1. Shutdown Input (JU1)
*Default position.
SHUNT POSITION SHDN PIN AMPLIFIER
Installed* Connected to VDD Enabled
Not installed Connected to GND
through R9 Disabled
MAX97220A Evaluation Kit
Evaluates: MAX97220A–MAX97220D
_______________________________________________________________________________________ 3
Figure 1. MAX97220A EV Kit Schematic
MAX97220A Evaluation Kit
Evaluates: MAX97220A–MAX97220D
4 ______________________________________________________________________________________
Figure 3. MAX97220A EV Kit PCB Layout—Component Side
Figure 2. MAX97220A EV Kit Component Placement Guide—
Component Side
Figure 4. MAX97220A EV Kit PCB Layout—Solder Side
1.0’’
1.0’’
1.0’’
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
© 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX97220A Evaluation Kit
Evaluates: MAX97220A–MAX97220D
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 12/10 Initial release —
