CS43L22

Portable Audio DAC with Integrated Class D Speaker Driver

The CS43L22 is a highly integrated, low-power stereo digital/analog converter (DAC) with headphone and Class D speaker amplifiers. The DAC output path includes a digital signal processing engine with various fixed-function controls, such as tone and volume control. The DAC also includes de-emphasis, limiting functions and beep generator that delivers tones selectable across a range of two octaves.

The stereo headphone amplifier is powered from a separate positive supply and the integrated charge pump provides a negative supply, allowing for a ground-centered analog output that eliminates the need for DC blocking capacitors. The Class D stereo speaker, which does not require an external filter, may be powered directly from a battery.

The CS43L22 accommodates analog routing of the input signal directly to the headphone amplifier — a useful feature for applications that utilize an FM tuner. 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.

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Documentation

Stereo DAC

  • High Performance Stereo DAC
    • 98 dB Dynamic Range (A-wtd)
    • -88 dB THD+N
    • 4 kHz to 96 kHz Sample Rates
  • Digital Signal Processing Engine
    • Bass & Treble Tone Control
    • Soft-Ramp & Zero-Cross Transitions
    • Programmable Peak-Detect and Limiter
    • Beep Generator w/Full Tone Control

Class D Stereo/Mono Speaker Amplifier

  • No External Filter Required
  • High Stereo Output Power at 10% THD+N
    • 2 x 1.00 W into 8 Ω @ 5.0 V
    • 2 x 550 mW into 8 Ω @ 3.7 V
    • 2 x 230 mW into 8 Ω @ 2.5 V
  • High Mono Output Power at 10% THD+N
    • 1 x 1.90 W into 4 Ω @ 5.0 V
    • 1 x 1.00 W into 4 Ω @ 3.7 V
    • 1 x 350 mW into 4 Ω @ 2.5 V
  • Direct Battery Powered Operation
    • Battery Level Monitoring & Compensation
  • 82% at 800 mW
  • Phase-Aligned PWM Output Reduces Idle Channel Current
  • Low Quiescent Current

Stereo Headphone Amplifier / Line Output

  • Ground Centered Outputs
    • Integrated Charge Pump
    • No DC-Blocking Capacitor Required
  • High Power Output at -75 dB THD+N
    • 2 x 23 mW Into 16 Ω @ 1.8 V
    • 2 x 44 mW Into 16 Ω @ 2.5 V

System Features

  • 12, 24, and 27 MHz Master Clock Support in Addition to Typical Audio Clock Rates
  • High Performance 24-bit Converter
    • Multi-bit Delta Sigma Architecture
    • Very Low 64Fs Oversampling Clock Reduces Power Consumption
  • Low Power Operation
    • Stereo Analog Passthrough: 10 mW @ 1.8 V
    • Stereo Playback: 14 mW @ 1.8 V
  • Variable Power Supplies
    • 1.8 V to 2.5 V Digital & Analog
    • 2.5 V to 5 V Class D Amplifier
    • 1.8 V to 2.5 V Headphone Amplifier
    • 1.8 V to 3.3 V Interface Logic
  • Power Down Management
  • Flexible Clocking Options
    • Master or Slave Operation
    • High Impedance Digital Output Option
    • Quarter-Speed Mode - (i.e. allows 8 kHz Fs while maintaining a flat noise floor up to 16 kHz)
  • I²C Control Port Operation
  • Headphone/Speaker Detection Input
  • Pop and Click Suppression

Applications

  • Portable Media Players
  • MP3 Players
  • MP3 Docking Stations
  • Handheld GPS
  • IP Set Top Boxes
  • Portable DVD Player
  • Portable Gaming Devices
  • Toys

Related Documents

Design Resources

Tools and Software

Podcast Available

CS43L22 - Related News Releases

October 1, 2007
DAC Adds Stereo Headphone and Class-D Speaker Drivers, Expands Cirrus Logic Low-Power IC Family
Part Resolution (bits) Dynamic Range (dB) THD+N (dB) Sample Rate (kHz) Analog I/O Power Supply (V) Comments Package
CS43L22 24 98 -88 96 Single-ended VA/VD = 1.65 to 2.83;
VP = 2.37 to 5.35;
VL = 1.8 to 3.3
DAC w/ PWM Speaker Driver 40 QFN
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