Features and Benefits

  • 1.8V to 3.6V Single-Supply Operation
  • 8 Programmable Maximum Gain Settings (+3.5dB to +26dB)
  • 3:1 Stereo Input Multiplexer/Mixer
  • Automatic Volume Ramping During Mode Transitions
  • Industry-Leading Click-and-Pop Suppression
  • DirectDrive Headphone Amplifier
  • Integrated 32-Level Volume Control
  • Hardware/Software Shutdown Control
  • Software-Enabled Bass Boost (BassMax)
  • I²C/SMBus-Compatible Interface
  • All Components Less than 1mm in Height
  • Fully Assembled and Tested

Product Details

The MAX9729 evaluation kit (EV kit) is a fully assembled and tested printed-circuit board (PCB) that evaluates the MAX9729 stereo DirectDrive® headphone amplifier with BassMax and volume control. The MAX9729 consists of a Class AB amplifier, a 3:1 stereo input multiplexer/mixer, comprehensive click-and-pop suppression circuitry, and a 2-wire interface. (The EV kit is designed to operate from a 1.8V to 3.6V DC power supply and delivers 52mW (at 3V) into a 32Ω stereo headphone.) The EV kit includes a 3.5mm stereo headphone jack and an I²C/SMBus-compatible interface that allows for software control of the BassMax (bass boost), shutdown, beep level, and output volume-setting features.

The MAX9729 evaluation system (EV system) consists of the MAX9729 EV kit and the Maxim CMAXQUSB command module. Windows® 98/2000/XP-compatible software is also available for use with the MAX9729 EV system and can be downloaded from Maxim's website (www.maximintegrated.com/evkitsoftware).

The Maxim CMAXQUSB command module provides the I²C/SMBus interface and is connected to the computer through the universal serial bus (USB) port. The MAX9729 EV kit software provides a graphical user interface (GUI) for exercising the MAX9729 features.


  • Automotive Rear Seat Entertainment (RSE)
  • Cell Phones
  • Flat-Panel TVs
  • MP3/PMP Players
  • Portable CD/DVD/MD Players