19-0714; Rev 2; 8/07
MAX9788 Evaluation Kit
General Description
The MAX9788 evaluation kit (EV kit) is a fully assembled
and tested PCB that uses the MAX9788 Class G ampli-
fier to drive a bridge-tied-load (BTL) ceramic speaker in
portable audio applications. Designed to operate from
a 2.7V to 5.5VDC power supply, the EV kit accepts a
single-ended or differential input signal and provides a
fully differential output capable of delivering greater
than 14V
P-P
into a ceramic speaker.
♦
5V Single-Supply Operation
♦
Fully Differential Output
♦
Delivers Greater than 14V
P-P
into a Ceramic
Speaker
♦
Evaluates the MAX9788 in a 20-Bump UCSP
(2mm x 2.5mm) Package
♦
The MAX9788 IC Also Available in 28-Pin
(4mm x 4mm) TQFN Package
♦
Fully Assembled and Tested
Features
Evaluates: MAX9788
Component List
DESIGNATION
C1, C2, C3
QTY
3
DESCRIPTION
0.1µF ±10%, 6.3V X5R ceramic
capacitors (0402)
Murata GRM155R60J104K
1µF ±10%, 6.3V X5R ceramic
capacitors (0402)
Murata GRM155R60J105K
4.7µF ±10%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J475K
10µF ±20%, 6.3V X5R ceramic
capacitors (0603)
Murata GRM188R60J106M
Not installed, capacitors (0603)
3-pin header
3.5mm stereo phone jack
(3-position, non-switch)
10k
Ω
±0.5% precision thick-film chip
resistors (0603)
Panasonic ERJ3RBD1002V
100k
Ω
±1% resistor (0603)
5.1
Ω
±5% resistors (0805)
MAX9788EBP+ (20-bump, 4 x 5
UCSP, 2mm x 2.5mm)
Shunt
PCB: MAX9788EVKIT+
C5, C6
2
Ordering Information
PART
MAX9788EVKIT+
TEMP RANGE
0°C to +70°C*
IC PACKAGE
20 UCSP-20
(2mm x 2.5mm)
C7
1
+Denotes
a lead-free and RoHS-compliant EV kit.
*This
limited temperature range applies to the EV kit PCB only.
The MAX9788 IC temperature range is -40°C to +85°C.
C8, C9, C10
C11, C12
JU1
OUT
3
0
1
1
Component Suppliers
SUPPLIER
Murata Mfg. Co., Ltd.
Panasonic Corp.
PHONE
770-436-1300
714-373-7366
WEBSITE
www.murata.com
www.panasonic.com
R1–R4
R5
R6, R7
U1
—
—
4
1
2
1
1
1
Note:
Indicate that you are using the MAX9788 when contact-
ing these component suppliers.
________________________________________________________________
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.
MAX9788 Evaluation Kit
Evaluates: MAX9788
Quick Start
•
5V, 1A power supply
•
Audio source (i.e., CD player, MP3 player)
•
One ceramic speaker (recommended suppliers:
Murata, Taiyo Yuden)
The EV kit accepts single-ended or a differential audio
input and provides a fully differential output. The audio
input source is amplified to drive greater than 14V
P-P
into a ceramic speaker.
Recommended Equipment
Customizing the Gain
The MAX9788 EV kit is shipped with a gain of +12dB.
Change the resistors (R1–R4) to customize the gain of
the EV kit (refer to the MAX9788 IC data sheet for
details).
Procedure
The MAX9788 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 con-
nections are completed.
1) Install a shunt across pins 1-2 of jumper JU1 (EV kit
ON).
2) Connect the ceramic speaker across the OUT- and
OUT+ pads.
3) Connect the positive terminal of the power supply to
the VCC pad and the ground terminal to the GND
pad.
4) Connect the positive terminal of the audio source to
the IN+ pad.
5) Connect the negative terminal of the audio source
to the IN- pad. Connect the IN- pad to GND if the
audio source is single ended.
6) Connect the ground terminal of the audio source to
the GND pad.
7) Turn on the audio source.
8) Turn on the power supply.
Jumper Selection
Shutdown Mode (SHDN)
Jumper JU1 controls the shutdown pin (SHDN) of the
MAX9788 IC. The shutdown pin is also controlled by
an external logic controller connected to the EV kit
SHDN
pad. Remove the shunt from jumper JU1 before
connecting an external controller to the
SHDN
pad.
See Table 1 for shunt positions.
Table 1. Shutdown Mode, JU1 Jumper
Selection
SHUNT
POSITION
1-2*
2-3
MAX9788
SHDN
PIN CONNECTED
TO
VDD
GND
External logic
controller
EV KIT FUNCTION
EV kit enabled
Shutdown mode
SHDN
driven by external
logic controller.
Shutdown is active low
and 1.8V logic compliant.
None
Detailed Description
The MAX9788 EV kit features the MAX9788 Class G
amplifier IC, designed to drive a ceramic speaker in a
BTL configuration. The EV kit operates from a DC power
supply that provides 2.7V to 5.5V and 1A of current.
*Default
position.
2
_______________________________________________________________________________________
MAX9788 Evaluation Kit
Evaluates: MAX9788
VCC
VCC
D1
C8
10μF
C2
0.1μF
C1
0.1μF
D5
D3
VCC
SHDN
1
2
3
V
CC
V
CC
GND
U1
PV
SS
CPV
DD
CPGND
A3
A1
VCC
C9
10μF
GND
C1
C2
C4
A2
C7
4.7μF
R6
5.1Ω
1
OUT+
C3
0.1μF
C10
10μF
MAX9788
JU1
R2
10kΩ
0.5%
B2
SHDN
SV
SS
SV
SS
C1P
B4
FB+
C1N
B1
D2
IN+
C5
1μF
R1
10kΩ
0.5%
C11
OPEN
B5
OUT+
IN+
OUT-
IN-
FB-
FS
3
OUT
D4
R7
5.1Ω
C5
R5
100kΩ
1%
2
IN-
C6
1μF
R3
10kΩ
0.5%
A5
A4
R4
10kΩ
0.5%
OUT-
C12
OPEN
Figure 1. MAX9788 EV Kit Schematic
_______________________________________________________________________________________
3
MAX9788 Evaluation Kit
Evaluates: MAX9788
Figure 2. MAX9788 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX9788 EV Kit PCB Layout—Component Side
Figure 4. MAX9788 EV Kit PCB Layout—Solder Side
Revision History
Pages changed at Rev 2: 1, 3, 4
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
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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