D/A Audio Converter consumes 13 mW at 1.8 V.
Press Release Summary:
Integrating Class D speaker amplifiers and stereo headphone drivers, 24-bit CS43L22 low-power stereo D/A converter provides 1 W per channel Class D amplification to external speakers and enough power to drive 44 mW per channel into stereo headphones. Portable device allows core to be run from single power supply and amplifier to be directly connected to battery supply. It features master clock support and dynamic range of 98 dB, utilizing 40-pin QFN package.
Original Press Release:
Full-Featured Cirrus Logic Low-Power Digital-to-Analog Audio Converter Enables Superior Battery Life
DAC Adds Stereo Headphone and Class-D Speaker Drivers, Expands Cirrus Logic Low-Power IC Family
AUSTIN - Oct. 01, 2007 - Cirrus Logic Inc. (Nasdaq: CRUS) has expanded its portfolio of low-power audio converter integrated circuits (ICs) for portable applications, introducing the 24-bit CS43L22 low-power stereo digital-to-analog converter (DAC) with integrated Class D speaker amplifiers and stereo headphone drivers.
The CS43L22 uses advanced low power circuit design techniques to minimize power consumption without sacrificing audio performance. Combined with high levels of integration, the CS43L22 maximizes battery life and saves overall system costs by eliminating the need for numerous external components.
Providing up to one watt-per-channel of highly efficient Class D amplification to external speakers and enough power to drive 44 milliwatts per channel into stereo headphones, this portable audio DAC also offers the flexibility to run its core from a single power supply and directly connect the Class-D amplifier to the battery supply for a more efficient operation. This combination of flexible features makes the CS43L22 an ideal audio DAC for portable consumer electronics applications such as portable media players, gaming devices, battery powered docking stations and portable navigation devices.
The CS43L22 builds upon the innovative design techniques of Cirrus Logic's newly refreshed low-power audio products by creating its own on-chip negative power supply voltage. With its ground-centered outputs, the CS43L22 helps reduce clicks and pops during start up, improves low-end frequency response, and eliminates costly, space-consuming DC blocking capacitors. Its stereo Class-D speaker amplifier with "filterless" outputs eliminates the need for external filter components, minimizing board space requirements and implementation cost. The DAC also features enhanced master clock support, which includes standard audio frequencies, as well as USB and video clocks. This limits the number of clocks in a system, providing designers a flexible, low-power solution.
"The CS43L22 is Cirrus' latest compelling audio component for the fast-growing segment of portable consumer electronics products," said Carl Alberty, senior marketing manager, Mixed Signal Audio Products. "Featuring our signature capless headphone outputs, filterless Class D speaker amps, ultra low power consumption and high-quality audio processing and conversion, the CS43L22 delivers exactly what product designers need."
Among its features, the CS42L22 provides a digital signal processing engine, digital volume control, headphone/speaker detection switch, as well as flexible signal routing that includes an analog bypass mode. The integrated Class-D speaker driver also features the ability to directly connect to the battery supply and then simultaneously monitor that supply and compensate for any decay in the voltage. With a dynamic range of 98 dB, the CS43L22 delivers high-performance audio output with low noise, all in an integrated solution that offers flexibility and reduced overall system cost.
The CS43L22 utilizes a 40-pin QFN package and consumes only 13 milliwatts of power at 1.8 volts in playback mode while driving stereo headphones.
Pricing and Availability
The CS43L22 is currently in volume production and is priced at $1.76 in quantities of 10,000.
Cirrus Logic Inc.
Cirrus Logic develops high-precision, analog and mixed-signal integrated circuits for a broad range of consumer and industrial markets. Building on its diverse analog mixed-signal patent portfolio, Cirrus Logic delivers highly optimized products for consumer and commercial audio, automotive entertainment and industrial and aerospace applications. The company operates from headquarters in Austin, Texas, with offices in Tucson, Ariz., Europe, Japan and Asia.
Cirrus Logic and Cirrus are trademarks of Cirrus Logic Inc. All other product names noted herein may be trademarks of their respective holders.
