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Category: Analog ICs
Finalist: CS42L55 portable audio codec (Cirrus Logic)
 The CS42L55 is a, 24-bit, ultra low power stereo codec (compressor-decompressor). It uses multi-bit delta-sigma modulation. The CS42L55 features a patent-pending two-mode Class H headphone amplifier that combines the efficiency of an integrated step-down/inverting charge pump with the linearity and low EMI of a Class AB amplifier. You can program the part to adapt the Class-H outputs to the volume or the output signal as well as operate in conventional class AB mode. An analog pass through also exists, which bypasses the ADC and DAC sections to improve noise performance and minimize power consumption. The inputs provide a pseudo-differential input that will eliminate common-mode noise in the signal.
The innovation of the CS42L55 is the sum of many small achievements across the specifications of the part. In addition to the class-H headphone amplifier, the part has 99dB dynamic range and –86dB THD+N (total harmonic distortion plus noise) for the DAC, and 95dB dynamic range and –87dB THD+N for the ADC. The part can provide a 1 Vrms signal from a 1.8V power supply. The part has a two-octave beep generator. It comes in a package that is only 0.5 mm (max) thick, and has a fill complement of signal processing capabilities. The clear organization and style of the 73-page datasheet is also a remarkable achievement for a part as complicated as a modern audio codec.
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