MAX9768EVKIT+ Maxim Integrated Products, MAX9768EVKIT+ Datasheet - Page 4

• Manufacturer Part Number: MAX9768EVKIT+
• Description: EVALUATION KIT FOR MAX9768
• Manufacturer: Maxim Integrated Products

Specifications of MAX9768EVKIT+

• Amplifier Type: Class D
• Output Type: 1-Channel (Mono)
• Max Output Power X Channels @ Load: 10W x 1 @ 8 Ohm
• Voltage - Supply: 4.5 V ~ 14 V
• Operating Temperature: -40°C ~ 85°C
• Board Type: Fully Populated
• Utilized Ic / Part: MAX9768
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX9768 is a mono, switch-mode (Class D) audio
power amplifier. The EV kit is designed to be driven by
the lineout or headphone jack of a CD player, or direct-
ly connected to any audio source. A thumbwheel
potentiometer mounted on-board is provided to control
the volume. The volume can also be controlled by the
I
The EV kit has an on-board LDO (MAX1726) to power
the input buffers and the volume-control circuitry.
The preamplifier gain stage of the MAX9768 EV kit is
configured to 0dB. To avoid clipping at the amplifier
input stage, ensure input signals are ≤ 1V
signals are ≥ 1V
preamplifier gain stage to avoid clipping at the pream-
plifier output. The preamplifier gain stage is defined as:
where R2 is in the 10kΩ to 40kΩ range.
Define the preamplifier gain such that the output of the
preamplifier is ≤ 1V
1V
amplifier’s volume-control block to set the clipping lev-
els at the output of the Class D amplifier.
The power supply is applied on PV
posts. V
or by an external 3.3V power supply applied between the
V
MAX9768 Evaluation Kit/Evaluation System
Table 2. JU7 Jumper Setting
* Default position.
4
2
JUMPER SHUNT POSITION
DD
C interface.
Detailed Description of Hardware
RMS
JU7
_______________________________________________________________________________________
pad and PGND. See Table 2 for JU7 setting.
). Once the preamplifier gain is fixed, use the
DD
is generated either by the on-board MAX1726
Preamplifier Gain Configuration
A
V (preamplifier)
RMS
Open
1-2*
RMS
, attenuate the input signal at the
(i.e., V
On-board V
MAX1726
User-provided 3.3V V
power supply
= -R3 / R2
IN
DD
x A
Power Supplies
DESCRIPTION
and PGND binding
V (preamplifier)
DD
generated by
RMS
. If input
DD
≤
Jumpers JU3, JU4, JU5, and JU8 select which volume-
control mode is used. See Table 3 for details.
Jumper JU2 sets the amplifier in normal operation or
shutdown mode. See Table 4 for details.
Jumper JU1 controls the MUTE pin state. See Table 5
for details.
Table 3. Control-Mode Setting
* Default position.
Table 4. JU2 Setting
* Default position.
Table 5. JU1 Setting
* Default position.
JUMPER SHUNT POSITION
JU3, JU4
JUMPER SHUNT POSITION
JUMPER SHUNT POSITION
JU5
JU8
JU2
JU1
1-2, 2-3
2-3, 1-2
Open
Open
2-3*
2-3*
1-2*
1-2*
2-3*
1-2
1-2
2-3
1-2
I
alone operation
I
I
I
Stand-alone operation
I
In stand-alone operation:
classic PWM modulation
In stand-alone operation:
filterless modulation
I
Normal operation
Shutdown mode
Normal operation
Speaker muted
2
2
2
2
2
2
C Address: disabled, stand-
C Address: 1001 011x
C Address: 1001 001x
C Address: 1001 010x
C volume control mode
C interface control mode
Shutdown Mode
Volume Control
DESCRIPTION
DESCRIPTION
DESCRIPTION
Mute Control