The MAX9708 mono/stereo, Class D audio power amplifier
delivers up to 2 x 21W into an 8Ω stereo mode and
1 x 42W into a 4Ω load in mono mode while offering up to
87% efficiency. The MAX9708 provides Class AB amplifier
performance with the benefits of Class D efficiency,
eliminating the need for a bulky heatsink and conserving
power. The MAX9708 operates from a single +10V to
+18V supply, driving the load in a BTL configuration.
The MAX9708 offers two modulation schemes: a fixedfrequency
modulation (FFM) mode, and a spread-spectrum
modulation (SSM) mode that reduces
EMI-radiated emissions. The MAX9708 can be synchronized
to an external clock from 600kHz to 1.2MHz. A
synchronized output allows multiple units to be cascaded
in the system.
Features include fully differential inputs, comprehensive
click-and-pop suppression, and four selectable-gain settings
(22dB, 25dB, 29.5dB, and 36dB). A pin-programmable
thermal flag provides seven different thermal
warning thresholds. Short-circuit and thermal-overload
protection prevent the device from being damaged
during a fault condition.
The MAX9708 is available in 56-pin TQFN (8mm x 8mm
x 0.8mm) and 64-pin TQFP (10mm x 10mm x 1.4mm)
packages, and is specified over the extended
-40°C to +85°C temperature range.