19-3521; Rev 2; 11/07
MAX9713 Evaluation Kit
General Description
The MAX9713 evaluation kit (EV kit) is a fully assembled
and tested printed-circuit board (PCB) that contains the
MAX9713 filterless class D amplifier. The EV kit is capa-
ble of delivering 6W into an 8Ω load and is designed to
operate from a 10V to 25V DC power supply. The
MAX9713 EV kit accepts differential or single-ended
input signals and provides an option to select between
different switching frequencies.
♦
10V to 25V Single-Supply Operation
♦
Up to 85% Efficiency
♦
Drives 6W into 8Ω or 8W into 16Ω
♦
Differential or Single-Ended Input Modes
♦
Pin-Selectable Frequency Options
♦
Pin-Selectable Gain Options
♦
Low 0.1% THD+N
♦
Surface-Mount Construction
♦
Fully Assembled and Tested
Features
Evaluates: MAX9713
Ordering Information
PART
MAX9713EVKIT+
TYPE
EV Kit
+Denotes
lead-free and RoHS-compliant.
Component List
DESIGNATION
C1
QTY
1
DESCRIPTION
0.1µF ±10%, 25V X5R ceramic
capacitor (0402)
TDK C1005X5R1E104K
33µF ±10%, 35V tantalum
capacitors (D case)
AVX TAJD336K035
0.1µF ±10%, 25V X7R ceramic
capacitors (0603)
Murata GRM188R71E104K
TDK C1608X7R1E104K or
equivalent
100pF ±5%, 50V C0G ceramic
capacitors (0402)
Murata GRP1555C1H101J
Taiyo Yuden UMK105CG101JW
TDK C1005C0G101J
0.47µF ±10%, 6.3V X5R ceramic
capacitors (0402)
Murata GRM155R60J474K
TDK C1005X5R0J474K
0.01µF ±10%, 25V X7R ceramic
capacitor (0402)
Murata GRP155R71E103K
TDK C1005X7R1E103M
DESIGNATION
QTY
DESCRIPTION
1µF ±10%, 25V X7R ceramic
capacitor (0805)
TDK C2012X7R1E105K or
equivalent
1000pF ±10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H102K
TDK C1608X7R1H102KT
Not installed, ceramic capacitor
(0603)
Not installed, ceramic capacitors
(0402)
5.1V, 20mA zener diode (SOT-23)
Central CMPZ5231B LEAD FREE
(Top Mark: C8F)
100Ω ±25%, 1.7A ferrite bead
(0603)
Murata BKP1608HS101-T
1kΩ ±25%, 150mA ferrite beads
(0402)
Murata BK1005HM102-T
C13
1
C2, C3
2
C14
1
C4, C5
2
C15
C16–C22
0
0
C6, C7, C8
3
D1
1
FB1
1
C9, C10, C12
3
FB2, FB3
FOUT1+,
FOUT1-,
FOUT2+,
FOUT2-
JU1–JU5
JU6, JU7
2
C11
1
0
Not installed, test points
5
2
3-pin headers
2-pin headers
________________________________________________________________
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.
MAX9713 Evaluation Kit
Evaluates: MAX9713
Component List (continued)
DESIGNATION
L4, L5
R1
R2, R3
T1
U1
—
—
QTY
0
1
0
0
1
7
1
DESCRIPTION
Not installed, power inductors
10kΩ ±5% resistor (0402)
Not installed, resistors (0402)
Not installed, common-mode choke
32-pin TQFN-EP*, 5mm x 5mm x 0.8mm
Maxim MAX9713ETJ+
Shunts
PCB: MAX9713 Evalution Kit+
3) Verify shunts across pins 1-2 of jumpers JU2 and
JU3 (Gain = 16dB).
4) Verify shunts across pins 1-2 of jumpers JU4 and
JU5 (spread-spectrum mode, frequency centered at
335kHz).
5) Connect the speaker across the OUT+ and OUT-
pads.
6) Connect the positive terminal of the 15V power sup-
ply to the V+ pad and the ground terminal of the
power supply to the GND pad.
7) Connect the audio source across the VIN+ and VIN-
pads.
8) Turn on the power supply, and then turn on the
audio source.
*EP
= Exposed paddle.
Component Suppliers
SUPPLIER
AVX Corp.
PHONE
WEBSITE
843-946-0238 www.avxcorp.com
Detailed Description
The MAX9713 EV kit contains the MAX9713 filterless
class D amplifier IC. The EV kit operates from a 10V to
25V DC power supply and accepts a differential or sin-
gle-ended audio input source. The single-ended input
mode accepts up to 2V
P-P
signals, and the differential
mode accepts up to 4V
P-P
signals. The audio input
source is amplified to drive 6W into an 8Ω speaker.
The MAX9713 EV kit provides three sets of differential
outputs. The device outputs (OUT+/-) can be connect-
ed directly to a speaker load without any filtering.
However, a filter can be added to ease evaluation. The
filtered outputs (FOUT1+/-) require installation of filter-
ing components T1, C21, and C22. The LCR filtered
outputs (FOUT2+/-) require installation of filtering com-
ponents L4, L5, C15–C20, R2, and R3.
Central
631-435-1110 www.centralsemi.com
Semiconductor Corp.
Murata Mfg. Co., Ltd. 770-436-1300 www.murata.com
Taiyo Yuden
TDK Corp.
800-348-2496 www.t-yuden.com
847-803-6100 www.component.tdk.com
Note:
Indicate that you are using the MAX9713 when contact-
ing these component suppliers.
Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
• 15V, 1A power supply
• Audio source (i.e., CD player, cassette player)
• 8Ω/16Ω speaker
Procedure
The MAX9713 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 no shunt is across jumper JU6 (differential
input mode).
2) Verify shunt across pins 1-2 of jumper JU1. Install
shunt across jumper JU7 (EV kit is enabled).
2
_______________________________________________________________________________________
MAX9713 Evaluation Kit
Jumper Selection
Shutdown Mode
Jumpers JU1 and JU7 control the shutdown pin
(SHDN) of the MAX9713. See Table 1 for the JU1 and
JU7 functions.
Note:
Contact your local Maxim representative for rec-
ommended MAX9713 filtering component values.
Gain Selection
Jumpers JU2 and JU3 provide an option to select the
output voltage gain. See Table 2 for JU2 and JU3 func-
tions. See Table 5 for power vs. gain and input levels.
Switching Frequency
The MAX9713 has two operating modes, fixed-frequen-
cy modulation (FFM) mode and spread-spectrum mod-
ulation (SSM) mode. Jumpers JU4 and JU5 control pins
FS1 and FS2. See Table 3 for JU4 and JU5 functions.
Evaluates: MAX9713
Table 1. JU1 and JU7 Functions (SHDN)
JU1 SHUNT POSITION
Pins 1 and 2
Pins 2 and 3
Pins 1 and 2
JU7 SHUNT POSITION
Installed (SHDN = high)
Installed, without external signal (SHDN = low)
Not installed, with external signal connected to
SHDN
pad
EV KIT FUNCTION
EV kit enabled (default)
Shutdown mode
SHDN
pin driven by external signal. Shutdown
is active low.
Table 2. JU2 and JU3 Functions (G1 and G2)
JU2 SHUNT LOCATION
Pins 1 and 2 (G1 = high)
Pins 1 and 2 (G1 = high)
Pins 2 and 3 (G1 = low)
Pins 2 and 3 (G1 = low)
JU3 SHUNT LOCATION
1-2 (G2 = high)
2-3 (G2 = low)
1-2 (G2 = high)
2-3 (G2 = low)
MAX9713 OUTPUT GAIN (dB)
16 (default)
13
19.1
22.1
Note:
Make sure a shunt is installed across pins 1-2 of jumper JU1.
Table 3. JU4 and JU5 Functions (FS1 and FS2)
JU4 SHUNT LOCATION
Pins 1 and 2 (FS1 = high)
Pins 1 and 2 (FS1 = high)
Pins 2 and 3 (FS1 = low)
Pins 2 and 3 (FS1 = low)
JU5 SHUNT LOCATION
1-2 (FS2 = high)
2-3 (FS2 = low)
1-2 (FS2 = high)
2-3 (FS2 = low)
MAX9713 SWITCHING FREQUENCY
(kHz)
335 ±10%, SSM (default)
236, FFM
460, FFM
335, FFM
Note:
Make sure a shunt is installed across pins 1-2 of jumper JU1.
_______________________________________________________________________________________
3
MAX9713 Evaluation Kit
Evaluates: MAX9713
Input Mode
Jumper JU6 provides an option to select between a
differential or single-ended input mode of the EV kit.
See Table 4 for JU6 functions.
Table 5. MAX9713 Power vs. Gain and
Input Levels at 10% THD+N
GAIN (dB)
V
IN
DIFF RMS (V)
1.27
0.89
0.63
0.45
0.78
0.54
0.39
0.27
R
L
(Ω)
16
16
16
16
8
8
8
8
P
OUT
AT 10%
THD+N (W)
8
8
8
8
6
6
6
6
Table 4. JU6 Functions
SHUNT POSITION
Not installed
Installed (VIN- pad AC-coupled
to GND)
EV KIT INPUT MODE
Differential input mode
(default)
Single-ended input mode
13.0
16.1
19.1
22.1
13.0
16.1
19.1
22.1
4
_______________________________________________________________________________________
DVDD
FB1
V+
VDD
R1
10kΩ
1
2
3
C4
0.1μF
C5
0.1μF
R2
OPEN
GND
C3
33μF
35V
C14
1000pF
C2
33μF
35V
JU1
3
D1
OUT+
3
21
V
DD
V
DD
29
FOUT1+
3
T1
4
1
C22
OPEN
C18
OPEN
FOUT1-
L5
OPEN
27
OUT-
OUT- 28
C15
OPEN
C21
2 OPEN
30
OUT+
OUT+
L4
OPEN
PGND PGND
C19
OPEN
FOUT2+
V
DD
V
DD
11
IN-
PGND PGND
4
1
22
23
2
24
C17
OPEN
1
Figure 1. MAX9713 EV Kit Schematic
12
IN+
C16
OPEN
FOUT2-
C20
OPEN
R3
OPEN
9
REG
OUT-
AGND
U1
10
VIN-
FB2
C9
0.47μF
GND
C6
100pF
JU6
VIN+
C8
100pF
C10
0.47μF
C7
100pF
FB3
C11
0.01μF
DVDD
MAX9713
14
SHDN
SHDN
JU7
DVDD
1
2
15
G1
C1P
6
JU2
3
16
G2
C1N
5
DVDD
C1
0.1μF
1
JU3
DVDD
2
3
1
18
FS1
C13
1μF
CHOLD
7
VDD
JU4
DVDD
2
3
1
2
19
FS2
N.C.
N.C.
17
20
25
N.C.
8
N.C.
N.C.
26
JU5
SS
N.C.
31
N.C.
32
13
C12
0.47μF
Evaluates: MAX9713
_______________________________________________________________________________________
3
MAX9713 Evaluation Kit
5
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