The MAX9706/MAX9707 combine three high-efficiency
Class D amplifiers with an active crossover to provide
stereo highpass outputs, and a mono lowpass output.
All three channels deliver up to 2.3W at 1% THD+N per
channel into 4Ω when operating from a 5V supply.
An internal active filter processes the stereo inputs (left
and right) into stereo highpass and mono lowpass outputs.
The crossover frequency is pin-selectable to four
different frequencies to accommodate a variety of
speaker configurations. The internal Class D amplifiers
feature low-EMI, spread-spectrum outputs. No output
filters are required.
The MAX9706 features Maxim's patented DirectDrive™
headphone amplifier, providing ground-referenced
headphone outputs without the need for bulky DC-coupling
capacitors. The headphone outputs are capable
of delivering 95mW per channel into 16Ω from a 3.3V
supply, and are protected against ESD up to ±8kV.
The MAX9706/MAX9707 feature pin-programmable
gain, synchronization inputs and outputs, and a shutdown
mode that reduces supply current to less than
1µA. All amplifiers feature click-and-pop suppression
circuitry. Both devices are fully specified over the -40°C
to +85°C extended temperature range and are available
in the thermally enhanced 36-pin (6mm x 6mm x
0.8mm) thin QFN package.
Key Features
Applications/Uses
Triple Class D Amplifiers Deliver 3 x 2.3W into 4Ω
Internal Active Crossover Filter with Adjustable
Crossover Frequency
Low-EMI, Spread-Spectrum Modulation
Low 0.02% THD+N
High PSRR (71dB)
DirectDrive Headphone Amplifier (MAX9706)
Enhanced Click-and-Pop Suppression
Input and Output Modulator Synchronization
Low-Power Shutdown Mode
Up To 90% Efficiency
Space-Saving (6mm x 6mm x 0.8mm) 36-Pin Thin
QFN Package
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