MAX9791AEVKIT+ Maxim Integrated, MAX9791AEVKIT+ Datasheet - Page 3

• Manufacturer Part Number: MAX9791AEVKIT+
• Description: Audio Amplifiers Programmers, Development Systems
• Manufacturer: Maxim Integrated

Specifications of MAX9791AEVKIT+

• Product: Class-D
• Output Power: 2 W
• Thd Plus Noise: 0.03 %
• Supply Current: 4.4 mA
• Maximum Power Dissipation: 2286 mW
• Audio Load Resistance: 4 Ohms
• Common Mode Rejection Ratio (min): 60 dB
• Factory Pack Quantity: 1

Jumper JU6 controls the MAX9791A EV kit’s wake-on-
beep feature. See Table 4 for jumper JU6 configuration.
Refer to the Wake-on-Beep section of the MAX9791/
MAX9792 IC data sheet for more information.
Table 2. Headphone Amplifier (Jumper JU2)
* Default position.
Table 3. LDO (Jumper JU3)
* Default position.
Table 4. Wake-on-Beep (Jumper JU6)
*Do not leave the BEEP pin unconnected.
** Default position.
†
Refer to MAX9791/MAX9792 IC data sheet.
Not installed
POSITION
POSITION
POSITION
Installed**
SHUNT
SHUNT
SHUNT
1-2*
1-2*
2-3
2-3
Connected to a
user-supplied
Connected to
Connected to
Connected to
Connected to
Connected to
LDO_EN PIN
BEEP output
BEEP PIN*
_______________________________________________________________________________________
HP_EN PIN
PGND
PGND
AVDD
AVDD
GND
Wake-on-beep feature is
disabled
A qualified BEEP signal †
overrides HP_EN and
SPKR_EN
speaker and headphone
amplifiers. The LDO must
be enabled (see Table 3).
EV KIT FUNCTION
MAX9791A LDO
Wake-on-Beep
HEADPHONE
AMPLIFIER
MAX9791A
Disabled
Disabled
Enabled
Enabled
enabling the
MAX9791A Evaluation Kit
The default gain-setting resistors (R1 and R2) configure
the speaker amplifier gain to 12dB. While the default
gain-setting resistors (R3 and R4) configure the head-
phone amplifier gain to 0dB. The gain can be changed
by replacing these resistors with other surface-mount
0603 resistors. Resistors with a tolerance of 1% are rec-
ommended for optimum performance. Use Table 5 and
the following equations to select new gain-setting resis-
tors for the corresponding channel:
where A
where A
Table 5. Component Function
Headphone right
Headphone left
Speaker and Headphone Gain Setting
Speaker right
VSPKR
VHP
Speaker left
CHANNEL
is the desired headphone voltage gain.
is the desired speaker voltage gain.
R
R
IN
IN
= - 4
=
−
⎛
⎜
⎝
⎛
⎜
⎝
40.2k
A
A
20k
VHP
VSPKR
Ω
Ω
⎞
⎟
⎠
k
⎞
⎟k
⎠
Ω
Ω
RIN
R1
R2
R3
R4
3