CS43131 MasterHIFI™ Audio Digital-to-Analog Converters (DACs)

Cirrus Logic's CS43131 is a 32-bit DAC with an integrated high-fidelity headphone amplifier that delivers superior system-level audio performance while maximizing battery performance. It provides the ability to differentiate through performance and features, including high impedance (600 Ω), a 130 dBA dynamic range, an impressive THD+N rating of -108 dB, and inter-channel isolation of greater than 110 dB. These DACs support sampling frequencies up to 384 kHz while consuming 23 mW of power and requiring minimal board space.

The on-board low noise, ground-centered headphone amplifier delivers more than 30 mW per channel into a 32 Ω load or 5 mW into a 600 Ω load. They provide proprietary AC impedance detection to support headphone fingerprinting. This capability allows for a consistent and transparent audio experience for the end user regardless of transducer impedances or frequency responses. The amplifier also supports adaptive post-processing for customer bundled and third-party headphones and headsets. An integrated auxiliary audio input and click-less switch are provided for non-high-fidelity use cases.

The CS43131 converters are designed with proprietary digital-interpolation filters that support five selectable digital filter responses minimizing pre-echos and ringing artifacts. The filtering options include low group delay with pseudo-linear phase and a fast or slow roll-off to preserve audio integrity. A patented on-chip DSD processor supports up to DSD128 in direct-mode while providing non-decimating volume control with soft ramp and 50 kHz filtering as recommended by Scarlet Book. A seamless transition between DSD and PCM playback paths is achieved through volume matching of the analog output levels and channel mixing.