60-mW, stereo headphone amp fits handsets - Embedded.com

60-mW, stereo headphone amp fits handsets


The MAX9724 is a 60-mW DirectDrive stereo headphone amplifier with high RF noise rejection. This device delivers audiophile audio quality with 0.02% THD+N, while eliminating the need for large and costly dc-blocking capacitors on the outputs. Developed by Maxim Integrated Products, the MAX9724 is highly immune to energy at radio frequencies. In handsets, MP3 players, and notebook applications, this is critical as numerous wireless technologies transmit data at frequencies of 100 MHz to 3 GHz. High RF immunity ensures that signals aren't demodulated into the audio bandwidth. This results in excellent audio quality, even in the presence of strong RF signals.

The 3- by 3-mm TQFN package helps reduce the total solution cost. The MAX9724 delivers up to 60 mW/channel into a 32-ê load, while offering 80 dB of PSRR and a 101 dB SNR. The device operates from a single 2.7- to 5.5-V supply, features short-circuit and thermal-overload protection, and is specified to operate an extended temperature range. Adjustable gain (MAX9724A) and fixed-gain (MAX9724B) versions are available. Prices start $0.70. A data sheet is available at www.maxim-ic.com/quick_view2.cfm/qv_pk/4628.

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