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• CS42L73 Product Brief
• CDB42L73 Product Brief
• White Paper

Ultra Low Power Device for Mobile Audio and Telephony

The Cirrus Logic CS42L73 smart audio CODEC is a high-quality, ultra low-power audio CODEC for smart phone applications that allows these power-hungry devices to conserve energy and extend battery life by offloading audio-related tasks typically reserved for the applications processor. The CS42L73 features three serial audio ports and asynchronous sample rate converters, allowing this smart audio CODEC to manage the complex routing, processing, and mixing of a variety of multiformat audio signals while increasing overall system efficiency. This Cirrus Logic device has a rated power consumption as low as 4 mW during a voice call, the lowest power consumption of a product with asynchronous sample-rate converters and a digital mixing engine in the signal path. The CS42L73 audio CODEC features two analog-to-digital converters (ADCs) and four digital-to-analog converters (DACs) based on an advanced multibit Delta Sigma architecture.

CDB42L73 Development Board

The Cirrus Logic CDB42L73 development board is a dedicated platform for testing and evaluating the CS42L73. Extensive hardware and software configurable options available on the CDB42L73 allow comprehensive testing of CS42L73 features and performance. Hardware options are configured via jumpers on the stake headers. Software options are configured with the FlexGUI software, which communicates with the CDB42L73 via USB from a Windows® compatible computer. Digital I/O headers allow external control signals to configure and interface with the CS42L73 and other devices directly. The CDB42L73 is a good component and layout reference for the CS42L73.

• Stereo ADC
  
• Dual Analog or Digital MIC Support
  
• Dual MIC Bias Generators
  
• Four DACs Coupled to Five Outputs: Ground-Centered Stereo Headphone Amp., Ground-Centered Stereo Line Output, Mono Ear Speaker Amplifier, Mono 1 W Speakerphone Amplifier, Mono Speakerphone Line Output for Stereo Speakerphone Expansion
  
• Three Serial Ports with Asynchronous Sample Rate Converters
  
• Digital Audio Mixing and Routing
  
• Ultra Low Power Consumption: 3.5 mW Quiescent Headphone Playback

• Smart Phones, UMPCs, and MIDs

• Analog Inputs
  - Line-level In via 2x mono RCA jacks
  - Microphone In via 2x mono 1/8" jacks
  
• Analog outputs
  - Headphone out via 1x stereo 1/8" jack
  - Line-level out via 2x mono RCA jacks
  - Earphone out via terminal block
  - Speakerphone out via terminal blocks
  
• S/PDIF interface via RCA/optical jacks
  - Input: CS8416 digital audio receiver
  - Output: CS8406 digital audio transmitter
  
• External digital I/O via stake headers: Digital mic in, Serial audio port I/O, External I²C™ control port I/O
  
• Flexible power-supply configuration: USB, external power supply, or battery
  
• FlexGUI software control