1. Description
ATJ2051 is a single-chip for flash-based digital music player. It includes an audio decoder with a
high performance DSP, ADPCM record capabilities and USB interface for downloading music and
uploading voice recordings. ATJ2051 also provides an interface to flash memory, button and switch
inputs, headphone, and microphone. ATJ2051’s programmable architecture supports the MP3,
WMA and other digital audio standards. For devices like USB-Disk, ATJ2051 can act as a USB
mass storage slave device to personal computer system. Its low power consumption allows a long
battery life, and an efficient flexible on-chip DC-DC converter allows many different battery
configurations, including 1xAA, 1xAAA, 2xAA, 2xAAA and Li-Ion. Built-in Sigma-Delta DAC & a
headphone driver to directly drive low impedance headphones. The ADC includes inputs for both
Microphone and Analog Audio in to support voice recording features. Thus, the ATJ2051 provides a
true ‘ALL-IN-ONE’ solution that is ideally suited for highly optimized digital audio players with mass
storage function.