Evaluation Board For CS43L22

The CS43L22 is a highly integrated, low power stereo DAC with headphone and Class D speaker amplifiers. The CS43L22 offers many features suitable for low power, portable system applications. The DAC output path includes a digital signal processing engine with various fixed function controls. Tone Control provides bass and treble adjustment of four selectable corner frequencies. Digital Volume controls may be configured to change on soft ramp transitions while the analog controls can be configured to occur on every zero crossing. The DAC also includes de-emphasis, limiting functions and a BEEP generator delivering tones selectable across a range of two full octaves. The stereo headphone amplifier is powered from a separate positive supply and the integrated charge pump provides a negative supply. This allows a ground-centered analog output with a wide signal swing and eliminates the need for external DC-blocking capacitors. The Class D stereo speaker amplifier does not require an external filter and provides the high efficiency amplification required by power sensitive portable applications. The speaker amplifier may be powered directly from a battery while the internal DC supply monitoring and compensation provides a constant gain level as the battery’s voltage decays. The CS43L22 accommodates analog routing of the analog input signal directly to the headphone amplifier. This feature is useful in applications that utilize an FM tuner where audio recovered over-the-air must be transmitted to the headphone amplifier directly. In addition to its many features, the CS43L22 operates from a low voltage analog and digital core making it ideal for portable systems that require extremely low power consumption in a minimal amount of space. The CS43L22 is available in a 40-pin QFN package in Commercial (-40 to +85 °C) grade.

• 98 dB Dynamic Range (A-wtd)
• 88 dB THD+N
• Headphone Amplifier - GND Centered
  • No DC-Blocking Capacitors Required
  • Integrated Negative Voltage Regulator
  • 2 x 23 mW into Stereo 16 ? @ 1.8 V
  • 2 x 44 mW into Stereo 16 ? @ 2.5V
• Stereo Analog Input Passthrough Architecture
  • Analog Input Mixing
  • Analog Passthrough with Volume Control
• Digital Signal Processing Engine
  • Bass & Treble Tone Control, De-Emphasis
  • PCM Input w/Independent Vol Control
  • Master Digital Volume Control and Limiter
  • Soft-Ramp & Zero-Cross Transitions
• Programmable Peak-Detect and Limiter
• Beep Generator w/Full Tone Control
  • Tone Selections Across Two Octaves
  • Separate Volume Control
  • Programmable On and Off Time Intervals
  • Continuous, Periodic, One-Shot Beep Selections