Low Voltage, Stereo, D/A Converter with Headphone Amplifier

The CS43L42 is a complete stereo, digital-to-analog output system including interpolation, 1-bit D/A conversion, analog filtering, volume control, line level outputs, and a headphone amplifier in a 24-pin TSSOP package.

The CS43L42 is based on Delta-Sigma modulation, where the modulator output controls the reference voltage input to an ultra-linear analog low-pass filter. This architecture allows infinite adjustment of the sample rate between 2 kHz and 100 kHz simply by changing the master clock frequency.

The CS43L42 contains on-chip digital bass and treble boost, peak signal limiting, and de-emphasis. The CS43L42 operates from a 1.8 to 3.3V supply and consumes only 16 mW of power with a 1.8V supply with the line amplifier powered-down. These features are ideal for portable CD, MP3, and mini-disc players, and other portable playback systems that require extremely low power consumption.

• 24-bit conversion / 96 kHz sample rate
• 96 dB dynamic range at 3V supply
• -85 dB THD+N
• Digital volume control
  • 96 dB attenuation, 1 dB step size
• Digital bass and treble boost
  • Selectable corner frequencies
  • Up to 12 dB boost in 1 dB increments
• Peak signal limiting to prevent clipping
• Headphone amplifier
  • up to 25 mWrms power output into 16 Ohms load
  • 25 dB analog attenuation and mute
  • Zero crossing click-free level transitions
• ATAPI mixing functions
• De-emphasis for 32 kHz, 44.1 kHz, and 48 kHz
• 1.8 to 3.3V supply
• Low power consumption
• Package: 24-pin TSSOP