Cirrus Logic, Inc. Low Power Codec with Class D Speaker Driver CS42L52

The CS42L52 is a 24-bit, low power stereo audio codec providing up to 1 W per channel of highly efficient Class D amplification to external speakers, or enough power to drive 44 mW per channel into stereo headphones and consumes only 13 mW of power at 1.8 V in playback mode. The CS42L52 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. With its ground-centered outputs, the CS42L52 helps to reduce clicks and pops during start up, improves low-end frequency response and eliminates costly, space-consuming DC blocking capacitors. Features Stereo Codec: High performance stereo ADC & DAC 99 dB (ADC),98 dB (DAC) dynamic range (A-wtd) -88 dB THD+N Flexible stereo analog input architecture 4:1 analog input MUXr Analog input mixing Analog pass-thru with volume control Analog Programmable Gain Amplifier (PGA) Programmable Automatic Level Control (ALC) Noise gate for noise suppression Programmable threshold & attack/release rates Dual MIC inputs Differential or single-ended +16 dB to +32 dB w/1 dB step MIC pre-amplifiers Programmable, low noise MIC bias levels Digital signal processing engine Bass & treble tone control, de-emphasis Master Vol. and independent PCM SDIN + ADC SDOUT Mix Vol. Ctl. Soft-ramp & Zero-cross transitions Programmable peak-detect and limiter Beep generator w/full tone control Class D Stereo/Mono Speaker Amplifier: No external filter required High stereo output power at 10% THD+N 2 x 1.00 W into 8 ω @ 5.0 V 2 x 550 mW into 8 ω @ 3.7 V 2 x 230 mW into 8 ω @ 2.5 V High mono output power at 10% THD+N 1 x 1.90 W into 4 ω @ 5.0 V 1 x 1.00 W into 4 ω @ 3.7 V 1 x 350 mW into 4 ω @ 2.5 V Direct battery powered operation Battery level monitoring & compensation 82% at 800 mW Phase-aligned PWM output reduces idle channel current Spread spectrum modulation Low quiescent current Stereo Headphone Amplifier: Ground centered outputs No DC-blocking capacitor required Integrated negative voltage regulator 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 High performance 24-bit converters Multi-bit Delta Sigma architecture Very low 64Fs oversampling clock reduces power consumption Low power operation Stereo analog passthrough: 10 mW @ 1.8 V Stereo playback: 14 mW @ 1.8 V Stereo record and playback: 23 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 ADC, DAC, codec, MIC pre-amplifier, PGA, headphone amplifier, speaker amplifier Analog & digital routing/mixes: Line/headphone out = analog in (ADC bypassed) Line/headphone/speak er out = ADC + digital in Digital out = ADC + digital in Internal digital loopback Mono mixes Flexible clocking options Master or slave operation High impedance digital output option (for easy MUXing between codec & other data sources) Quarter-speed mode - (i.e. allows 8 kHz Fs while maintaining a flat noise floor up to 16 kHz) 4 kHz to 96 kHz sample rates I²C control port operation Temperature monitor & shutdown Headphone/speaker detection input Pop and click suppression