MAX9709 Mono / Stereo, Class D Amplifier
MAX9709 Overview
The MAX9709 is a stereo / mono, Class-D audio amplifier. It can provide 2 x 25W power to a pair of 8Ω loads in stereo mode, and 1 x 50W power to a 4Ω load in mono mode, while achieving up to 87% s efficiency. The MAX9709 has the performance of a class AB amplifier and the efficiency advantages of a class D, eliminating the need for a bulky heat sink and saving power consumption. The MAX9709 operates from a single + 10V to + 22V power supply and drives the load in a BTL configuration.
The MAX9709 provides two modulation schemes: fixed frequency modulation (FFM) mode and spread spectrum modulation (SSM) mode. Spread spectrum modulation mode can reduce EMI radiation. The MAX9709 can synchronize to an external clock from 600kHz to 1.2MHz. The synchronous output allows multiple units to be connected in the middle of the system.
Device features include fully differential input, comprehensive noise suppression, and 4 selectable gain settings (22dB, 25dB, 29.5dB, and 36dB). Pin programmable temperature flags provide 7 different temperature alarm thresholds. Short-circuit and thermal overload protection protect the device from damage in the event of a fault.
The MAX9709 is available in a 56-pin TQFN (8mm x 8mm x 0.8mm) package and is rated to operate over the extended temperature range of -40 ° C to + 85 ° C.
Key features of MAX9709
In stereo mode, 2 x 25W output power (8Ω, THD = 10%) In mono mode, 1 x 50W output power (4Ω, THD = 10%) High efficiency: up to 87% unfiltered Class D amplifier unique, Patented spread-spectrum mode programmable gain (+ 22dB, + 25dB, + 29.5dB and + 36dB) High PSRR (90dB at 1kHz) Differential input suppresses common mode noise shutdown and mute control Integrated noise suppression 0.1% low THD + N current limit and thermal protection Programmable temperature flag clock synchronization input and output provide high thermal efficiency, space saving package: 56-pin TQFNMAX9709 Application / Use
Car LCD TV
PC / HiFi audio solution PDP TV
MAX9709 pdf datasheet (Class D amplifier)
MAX9709 application circuit
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