CS43L22

Portable Audio DAC with Integrated Class D Speaker Driver

Overview

Description

The CS43L22 is a highly integrated, low-power stereo 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.

Features

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

Diagram

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