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MAX9756 Evaluation Kit
Component List (continued)
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
OPTIONAL COMPONENTS
OPTIONAL COMPONENTS
JU1, JU5, JU10,
JU11, JU12
JU2, JU3, JU4,
JU6, JU8, JU9
JU7
5
6
1
2-pin headers
3-pin headers
4-pin header
R4
R5
R6
R7
—
1
1
1
1
12
100k ? ±5% resistor (0603)
100k ? potentiometer (multiturn)
47.0k ? ±1% resistor (0603)
82.0k ? ±1% resistor (0603)
Shunts
R2
1
10k ? thumb-wheel potentiometer
Component Suppliers
AVX
Kemet
Murata
TDK
SUPPLIER
PHONE
843-946-0238
864-963-6300
770-436-1300
847-803-6100
www.avxcorp.com
www.kemet.com
www.murata.com
www.component.tdk.com
WEBSITE
Note: Indicate that you are using the MAX9756 when contacting these manufacturers.
Quick Start
Recommended Equipment
? One 5V, 3A power supply
? One audio source
? Two speakers
? One headphone
? One DVM
Procedures
Do not turn on the power supply until all connec-
tions are completed.
1) Verify that a shunt is installed across pins 1 and 2
of jumper JU1 (HPVDD connected to VDD).
2) Verify that shunts are installed across pins 1 and 2
of jumpers JU2, JU3, and JU4 (speaker gain =
25.5dB, headphone gain = 3dB).
3) Verify that a shunt is installed across jumper JU5
(speaker enable).
4) Verify that a shunt is installed across pins 1 and 2
of jumper JU6 (linear regulator enabled).
5) Verify that a shunt is installed across pins 2 and 3
of jumper JU9 (linear regulator output = 4.65V).
6) Verify that a shunt is installed across pins 1 and 2
of jumper JU8 (MAX9756 enabled).
7) Verify that a shunt is installed on jumper JU12 (ALC
disabled).
8) Connect the first speaker to the OUTL+ and the
OUTL- pads.
9) Connect the second speaker to the OUTR+ and
the OUTR- pads.
10) Connect the +5V power supply to the VDD pad.
Connect the ground terminal of the power supply
to the SGND pad.
11) Connect the audio source to the IN_L and the IN_R
pads. Connect the ground from the audio source to
the GND pad.
12) Turn on the power supply and the audio source.
13) Adjust potentiometer R2 to change the speaker
volume.
14) Connect the headphone to phone jack J1.
15) Adjust potentiometer R2 to adjust the headphone
volume.
16) Verify the linear regulator output is approximately
4.65V.
Detailed Description
The MAX9756 is a Class AB amplifier designed to drive
stereo bridge-tied-load (BTL) speakers and a stereo
headphone in portable audio applications. The speaker
amplifiers operate from a 4.5VDC to 5.5VDC power sup-
ply, and deliver 2 x 2.3W power into a pair of 3 ? speak-
ers. The DirectDrive headphone amplifiers operate from
a 3VDC to 5.5VDC power supply, and deliver 130mW
continuous power into a 16 ? stereo headphone.
2
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