Features: ♦ 2 x 21W Output Power in Stereo Mode (8, THD = 10%)
♦ 1 x 42W Output Power in Mono Mode (4, THD = 10%)
♦ High Efficiency: Up to 87%
♦ Filterless Class D Amplifier
♦ Unique Patented Spread-Spectrum Mode
♦ Programmable Gain (+22dB, +25dB, +29.5dB, +36dB)
♦ High PSRR (90dB at 1kHz)
♦ Differential Inputs Suppress Common-Mode Noise
♦ Shutdown and Mute Control
♦ Integrated Click-and-Pop Suppression
♦ Low 0.1% THD+N
♦ Current Limit and Thermal Protection
♦ Programmable Thermal Flag
♦ SYNC Input/Output
♦ Available in Thermally Efficient, Space-Saving Packages: 56-Pin TQFN and 64-Pin
TQFPApplicationLCD TVs
Automotive
PDP TVs
PC/HiFi Audio SolutionsSpecificationsPVDD, VDD to PGND, GND ......................................-0.3 to +30V
PVDD to VDD........................................................-0.3V to +0.3V
OUTR+, OUTR-, OUTL+,
OUTL- to PGND, GND................................-0.3V to (PVDD + 0.3V)
C1N to GND .............................................-0.3V to (PVDD + 0.3V)
C1P to GND...............................(PVDD - 0.3V) to (CPVDD + 0.3V)
CPVDD to GND ..........................................(PVDD - 0.3V) to +40V
All Other Pins to GND..............................................-0.3V to +12V
Continuous Input Current (except PVDD, VDD, OUTR+,
OUTR-, OUTL+, and OUTL-) ...............................................20mA
Continuous Power Dissipation (TA = +70°C)
56-Pin Thin QFN (derate 47.6mW/°C above +70°C) ......3.81W
64-Pin TQFP (derate 43.5mW/°C above +70°C).............3.48W
Operating Temperature Range ........................-40°C to +85°C
Storage Temperature Range .........................-65°C to +150°C
Junction Temperature.....................................................+150°C
Thermal Resistance (JC)
56-Pin Thin QFN. .........................................................0.6°C/W
64-Pin TQFP....................................................................2°C/W
Lead Temperature (soldering, 10s) ...............................+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DescriptionThe MAX9708 mono/stereo, Class D audio power amplifier delivers up to 2 x 21W into an 8 stereo mode and 1 x 42W into a 4 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 of MAX9708 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 MAX9708 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.
MAX9708 Data Sheet
