Cirrus Logic, Inc. Portable Audio DAC with Integrated Class D Speaker Driver CS43L22

The CS43L22 is low power stereo digital/analog converter (DAC) with integrated headphone and Class D speaker amplifiers that operates from a low voltage analog and digital core. The DAC output path includes a digital signal processing engine with various fixed-function controls, such as tone and volume control, and includes de-emphasis, limiting functions and beep generator that delivers tones selectable across a range of two octaves. The stereo headphone amplifier is powered from a separate positive supply and the integrated charge pump provides a negative supply allowing for a ground-centered analog output to eliminate the need for DC blocking capacitors. The Class D stereo speaker does not require an external filter and can be powered directly from a battery. Features Stereo DAC Digital signal processing engine Bass, treble tone control Soft ramp, zero-cross transitions Programmable peak detect and limiter Beep generator with full tone control Class D Stereo/Mono Speaker Amplifier No external filter required Direct battery powered operation Battery level monitoring, compensation 82% at 800 mW Phase aligned PWM output reduces idle channel current Low quiescent current Stereo Headphone Amplifier / Line Output Ground-centered outputs Integrated charge pump No DC blocking capacitor required High power output at -75 dB THD+N 2 x 23 mW Into 16 ω @ 1.8 V 2 x 44 mW Into 16 ω @ 2.5 V System Features 12, 24, and 27 MHz master clock support in addition to typical audio clock rates Low power operation Stereo analog pass through: 10 mW @ 1.8 V Stereo playback: 14 mW @ 1.8 V Variable power supplies 1.8 V to 2.5 V digital, analog 2.5 V to 5 V Class D amplifier 1.8 V to 2.5 V headphone amplifier 1.8 V to 3.3 V interface logic Power down management Flexible clocking options Master or slave operation High impedance digital output option Quarter-speed mode (i.e. allows 8 kHz Fs while maintaining a flat noise floor up to 16 kHz) I²C control port operation Headphone/speaker detection input