GENERAL DESCRIPTION
The CS42L55 is a highly integrated, 24-bit, ultra-low power stereo CODEC based on multi-bit delta-sigma modulation. Both the ADC and DAC offer many features suitable for low power portable system applications.

DIGITAL to ANALOG FEATURES
♦ 5 mW Stereo Playback Power Consumption
♦ 99 dB Dynamic Range (A-wtd)
♦ -86 dB THD+N
♦ Digital Signal Processing Engine
    – Bass & Treble Tone Control, De-Emphasis
    – Master Volume Control (+12 to -102 dB in 0.5 dB steps)
    – Soft-Ramp & Zero-Cross Transitions
    – Programmable Peak-Detect and Limiter
    – Beep Generator w/Full Tone Control

ANALOG to DIGITAL FEATURES
♦ 3.5 mW Stereo Record Power Consumption
♦ 95 dB Dynamic Range (A-wtd)
♦ -87 dB THD+N
♦ 2:1 Stereo Input MUX
♦ Analog Programmable Gain Amplifier (PGA) (+12 to -6 dB in 0.5 dB steps)
♦ +20 dB Boost
♦ Programmable Automatic Level Control (ALC)
    – Noise Gate for Noise Suppression
    – Programmable Threshold & Attack/Release Rates
♦ Independent ADC Channel Control
♦ Digital Vol. Ctl. (0 to -96 dB in 1 dB steps)
♦ High-Pass Filter Disable for DC Measurements
♦ Pseudo Differential Inputs

Stereo Headphone and Line Amplifiers
♦ Step-Down/Inverting Charge Pump
♦ Class H Amplifier - Automatic Supply Adj.
    – High Efficiency
    – Low EMI
♦ Pseudo-Differential Ground-Centered Outputs
♦ High HP Power Output at -75 dB THD+N
    – 2 x 20 mW Into 32 Ω @1.8 V
    – 2 x 20 mW Into 16 Ω @1.8 V
♦ 1 VRMS Line Output @1.8 V
♦ Analog Vol. Ctl. (+12 to -55 dB in 1 dB steps)
♦ Analog In to Analog Out Passthrough
♦ Pop and Click Suppression

APPLICATIONS
♦ HDD & Flash-Based Portable Audio Players
♦ MD Players/Recorders
♦ PDAs
♦ Personal Media Players
♦ Portable Game Consoles
♦ Digital Voice Recorders
♦ Digital Camcorders
♦ Digital Cameras
♦ Smart Phones