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The MAX9706 evaluation kit (EV kit) is a fully assembled
and tested circuit board that evaluates the MAX9706
as well as the MAX9707 ICs. The MAX9706/MAX9707
contain three Class D amplifiers with an internal active
crossover to provide stereo highpass outputs and a
mono lowpass output. The IC does not require any
external components for the active crossover filter. The
MAX9706 also features a DirectDrive™ stereo headphone
amplifier.
The MAX9706 speaker amplifier operates from a 4.5V
to 5.5V DC power supply, and delivers 2.3W continuous
power into each of three 4Ω speakers. Three different
speaker output filtering options are available for ease of
evaluation (see the Output Filtering section in the full data sheet).
The MAX9706 headphone amplifier operates from a 3V
to 5.5V DC power supply, and delivers up to 95mW per
channel into a 16 stereo headphone. When the
MAX9706 headphone sense detects the insertion of a
headphone, the MAX9706 automatically enters the
headphone mode.
The EV kit offers an option to select between fixed-frequency
modulation (FFM) mode or spread-spectrum
modulation (SSM) mode. The EV kit can be synchronized
with an external clock, and the EV kit provides a
synchronization output that allows multiple units to be
cascaded in a system.
The MAX9706 EV kit gain is jumper selectable. The EV
kit also features an option to select the crossover frequency
between the stereo highpass outputs and the
mono lowpass output. The MAX9706 shutdown supply
current is only 0.5µA (typ).
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