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DAC integrates Class-D speaker amplifiers, headphone drivers

Austin, Tex. — Cirrus Logic Inc. has expanded its portfolio of low-power audio converter integrated circuits (ICs) for portable applications with the introduction of 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, and with high levels of integration, maximizes battery life and saves overall system costs by eliminating the need for numerous external components, said Cirrus Logic. Applications include portable consumer electronics applications such as portable media players, gaming devices, battery-powered docking stations and portable navigation devices.

Providing up to one watt-per-channel of 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. Packaged in a 40-pin QFN package, the CS43L22 consumes only 13 milliwatts of power at 1.8 volts in playback mode while driving stereo headphones

The stereo Class-D speaker amplifier with “filterless” outputs eliminates the need for external filter components. 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, said the company.

The CS43L22 offers a dynamic range of 98 dB and 4 kHz to 96 kHz sample rates.
Other features include a digital signal processing engine, digital volume control, headphone/speaker detection switch, as well as flexible signal routing that includes an analog bypass mode.

Pricing: $1.76 in quantities of 10,000.
Availability: Available in volume production.
Product information: CS43L22

Cirrus Logic Inc. , 1-512-851-4000, www.cirrus.com

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