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Stereo headphone amplifier delivers high RF noise rejection

Posted: 04 Nov 2005     Print Version  Bookmark and Share

Keywords:maxim integrated products  max9724  directdrive  headphone amplifier 

The new 60mW DirectDrive stereo headphone amplifier with high RF noise rejection from Maxim Integrated Products delivers audiophile audio quality with 0.02 percent THD+N, while eliminating the need for large and costly DC-blocking capacitors on the outputs.

According to the company, the MAX9724 amplifier is highly immune to energy at radio frequencies, which is critical in cellphone, MP3 and notebook applications since numerous wireless technologies transmit data at 100MHz to 3GHz frequencies. High RF immunity ensures that signals at radio frequencies are not demodulated into the audio bandwidth. This results in excellent audio quality, even in the presence of strong RF signals, added Maxim.

The company's patented DirectDrive architecture enables the MAX9724 to produce a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors. The architecture and the 3-by-3mm TQFN package reduce the total solution cost, and make the MAX9724 headphone amplifier a suitable solution for portable applications where board space is at a premium.

The MAX9724 delivers up to 60mW per channel into a 32-ohm load, while offering 80dB of PSRR and a 101dB SNR. This product operates from a single 2.7V to 5.5V supply, features short-circuit and thermal-overload protection, and is specified to operate over the extended -40°C to 85°C temperature range. Adjustable gain (MAX9724A) and fixed-gain (MAX9724B) versions are available in 3-by-3mm, 12-pin TQFN packages and 5-by-4.4mm, 14-pin TSSOP packages, respectively. Prices start 70 cents (1,000-up, FOB USA).

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