MAX9750AEVKIT Maxim Integrated, MAX9750AEVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX9750AEVKIT
• Description: Amplifier IC Development Tools
• Manufacturer: Maxim Integrated
• Series: MAX9750, MAX9751, MAX9755r

• One 5V, 2A power supply
• One 3V, 1A power supply
• One audio source
• Two 8Ω speakers
• One headphone
The MAX9750A EV kit is fully assembled and tested.
Follow the steps listed below to verify board operation.
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
2) Verify that shunts are installed across pins 1 and 2
3) Verify that a shunt is installed across pins 2 and 3 of
4) Verify that a shunt is installed across jumper JU5
5) Connect the first speaker to the OUTL+ and the
6) Connect the second speaker to the OUTR+ and the
7) Connect the +5V power supply to the VDD pad.
8) Connect the +3V power supply to the HPVDD pad.
9) Connect the audio source to the IN_L and the IN_R
10) Turn on both power supplies and the audio source.
11) Adjust potentiometer R2 to change the speakers’
12) Connect the headphone to the phone jack J1.
13) Adjust potentiometer R2 to adjust the headphone’s
MAX9750A Evaluation Kit
2
jumper JU1 (EV kit ON).
of jumpers JU2 and JU3 (speaker gain = 13.5dB,
headphone gain = 3dB).
jumper JU4 (volume control is selected).
(speaker enable).
OUTL- pads.
OUTR- pads.
Connect the ground terminal of the power supply to
the GND pad.
Connect the ground terminal of the power supply to
the GND pad.
pads. Connect the ground from the audio source to
the GND pad.
volume.
volume.
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Recommended Equipment
Quick Start
The MAX9750A EV kit is designed to evaluate the
MAX9750A/B/C, MAX9751, and MAX9755. The
MAX9750A/B/C, MAX9751, and MAX9755 are class AB
amplifiers that drive stereo BTL speakers, and stereo
headphones in portable audio applications. The speak-
er amplifiers operate from a 4.5VDC to 5.5VDC power
supply, and deliver 2 x 1.4W continuous power into a
pair of 8Ω speakers. The headphone amplifiers operate
from a 3VDC to 5.5VDC power supply, and deliver
110mW continuous power into 16Ω stereo headphones.
The EV kit can be powered by a 4.5VDC to 5.5VDC sin-
gle power supply.
The EV kit comes with the MAX9750A installed. The vol-
ume of the speakers and the headphone are adjustable
by the thumb-wheel potentiometer (R2) connected to
the analog volume control (VOL). The maximum gain of
the MAX9750A is selectable by jumpers JU2 and JU3.
The MAX9750A also features an audible alert input
(PC_BEEP).
The EV kit can also evaluate the MAX9750B,
MAX9750C, MAX9751, and MAX9755. To evaluate the
MAX9750B or MAX9750C, replace the MAX9750A with
the desired IC. To evaluate the MAX9751 or the
MAX9755, see the Evaluating the MAX9751 or the
Evaluating the MAX9755 sections in this data sheet for
additional information.
The speaker and headphone outputs on the EV kit can
be selected by jumper JU5 and the headphone jack J1.
See Table 4 in the Jumper Selection section.
Jumper JU1 controls the shutdown pin (SHDN) of the
MAX9750A/B/C, MAX9751, and MAX9755 ICs. See
Table 1 for shunt positions.
Table 1. JU1 Jumper Selection
SHUNT POSITION
None
1-2
2-3
High
Low
Connected to
external
controller
SHDN PIN
Detailed Description
Shutdown Mode (
Jumper Selection
Enabled
Disabled
SHDN driven by external
controller, shutdown is
active low
EV KIT FUNCTION
SHDN )