MAX9744EVCMAXQU+ Maxim Integrated, MAX9744EVCMAXQU+ Datasheet - Page 5

• Manufacturer Part Number: MAX9744EVCMAXQU+
• Description: Audio Amplifiers Evaluation Kit/Evaluation System for the MAX9744
• Manufacturer: Maxim Integrated

Specifications of MAX9744EVCMAXQU+

• Product: Class-D
• Output Power: 20 W
• Thd Plus Noise: 0.04 %
• Supply Current: 20 mA
• Maximum Power Dissipation: 2963 mW
• Audio Load Resistance: 4 Ohms

The MAX9744 EV kit board provides a good thermal
performance and EMC proven layout for evaluating the
MAX9744. The EV kit evaluates the MAX9744ETH+.
The MAX9744 EV kit is a 2 x 20W highly efficient Class D
speaker amplifier system. The EV kit can be driven by any
stereo audio source. The audio input impedance is 20kΩ.
The MAX9744 EV kit can be operated without the
CMAXQUSB command module. To do so, make sure all
the shunts on JU1, JU2, and JU3 are in the 2-3 position.
For more information, see Tables 1 and 3. While in stand-
alone operation mode, the user can rotate the thumb-
wheel potentiometer R7 to adjust the speaker volume.
Under stand-alone operation the user can use JU9 to
control the modulation mode, as shown in Table 2.
Remove the shunt of JU9 if using I
the EV kit.
The MAX9744 EV kit board should be powered by a
user-supplied DC power supply connecting to VCC and
GND. The power supply voltage can range widely from
4.5V to 14V.
Table 1. JU1 Function Description
* Default position.
Table 2. PWM Mode Configuration Under
Stand-Alone Operation
* Default position.
Detailed Description of Hardware
JU2
2-3*
1-2
1-2
2-3
1-2
1-2
2-3
2-3
JU1
2-3*
1-2
JU3
2-3*
1-2
2-3
1-2
1-2
2-3
1-2
2-3
I
Thumbwheel potentiometer control speakers’
volume
2
MAX9744 EV Kit Stand-Alone Operation
C interface control speakers’ volume
_______________________________________________________________________________________
Open*
Open
Open
Open
JU9
1-2
1-2
1-2
1-2
Controlled by I
interface
Invalid
Classic PWM modulation
Filterless modulation
FUNCTION
MAX9744 EV Kit
2
PWM MODE
C/SMBus to control
2
Power Supply
C/SMBus
MAX9744 Evaluation Kit/
There are three possible I
Table 3). Note that the I
if both JU2 and JU3 are set in the default position (2-3).
Jumper JU4 controls the hardware shutdown function
of the MAX9744 EV kit. This shuts down the entire
MAX9744 and resets all the registers to their power-on
default state. See Table 4 for shunt positions.
Jumper JU5 controls the speaker mute function of the
MAX9744 EV kit and it overrides the I
ting. See Table 5 for shunt positions.
Table 3. The I
* Default position.
Table 4. Hardware Shutdown (SHDN)
Function
* Default position.
Table 5. Hardware Mute Function
* Default position.
JUMPER
JUMPER
JU3
2-3*
JU4
JU5
1-2
1-2
2-3
Evaluation System
POSITION
POSITION
SHUNT
SHUNT
2
JU2
2-3*
1-2*
2-3*
1-2
2-3
1-2
2-3
1-2
C Address Configuration
MAX9744 I
2
C/SMBus interface is disabled
Hardware Shutdown Control
1001011x
1001010x
1001001x
I
High (normal operation)
Low (hardware shutdown)
High (mute)
Low (normal operation)
2
2
C/SMBus addresses (see
C/SMBus interface disabled
SHDN HARDWARE INPUT
MUTE HARDWARE INPUT
Hardware Mute Control
2
PIN LOGIC LEVEL
PIN LOGIC LEVEL
C Address Selection
I 2 C ADDRESS
2
C interface set-
5