CS53L21 Low Power, Stereo Analog to Digital Converter FEATURES SYSTEM FEATURES 98 dB Dynamic Range (A-wtd) 24-bit Conversion -88 dB THD+N 4 kHz to 96 kHz Sample Rate Analog Gain Controls Multi-bit Delta Sigma Architecture +32 dB or +16 dB MIC Pre-Amplifiers Low Power Operation Analog Programmable Gain Amplifier (PGA) Stereo Record (ADC): 8.72 mW 1.8 V +20 dB Digital Boost Stereo Record (MIC to PGA and ADC): 13.73 mW 1.8 V Programmable Automatic Level Control (ALC) Noise Gate for Noise Suppression Variable Power Supplies 1.8 V to 2.5 V Digital & Analog Programmable Threshold and Attack/Release Rates 1.8 V to 3.3 V Interface Logic Independent Left/Right Channel Control Power Down Management Digital Volume Control ADC, MIC Pre-Amplifier, PGA High-Pass Filter Disable for DC Measurements Stereo 3:1 Analog Input MUX Software Mode (IC & SPI Control) Dual MIC Inputs Hardware Mode (Stand-Alone Control) Programmable, Low Noise MIC Bias Levels Flexible Clocking Options Differential MIC Mix for Common Mode Master or Slave Operation Noise Rejection Digital Routing Mixes Very Low 64 Fs Oversampling Clock Reduces Power Consumption Mono Mixes 1.8 V to 3.3 V 1.8 V to 2.5 V Digital Hardware Mode 2 Signal ALC or I C & SPI Processing Software Mode Stereo Input 1 Engine Control Data Multibit Stereo Input 2 MUX Oversampling PGA ADC Volume +32 dB MUX Stereo Input 3 / Controls Reset Multibit Mic Input 1 & 2 +32 dB Oversampling MUX PGA High Pass ADC Filters MIC Serial Audio Bias ALC Output Register Configuration This document contains information for a new product. Preliminary Product Information Cirrus Logic reserves the right to modify this product without notice. Copyright Cirrus Logic, Inc. 2006 MAY 06 (All Rights Reserved) CS53L21 APPLICATIONS GENERAL DESCRIPTION The CS53L21 is a highly integrated, 24-bit, 96 kHz, low Portable Audio Players power stereo A/D. Based on multi-bit, delta-sigma mod- Digital Microphones ulation, it allows infinite sample rate adjustment between 4 kHz and 96 kHz. The ADC offers many fea- Digital Voice Recorders tures suitable for low power, portable system applications. Voice Recognition Systems The ADC input path allows independent channel control Audio/Video Capture Cards of a number of features. An input multiplexer selects be- tween line-level or microphone-level inputs for each channel. The microphone input path includes a select- able programmable-gain pre-amplifier stage and a low noise MIC bias voltage supply. A PGA is available for line or microphone inputs and provides analog gain with soft ramp and zero cross transitions. The ADC also fea- tures a digital volume attenuator with soft ramp transitions. A programmable ALC and Noise Gate mon- itor the input signals and adjust the volume levels appropriately. The Signal Processing Engine (SPE) controls left/right channel volume mixing, channel swap and channel mute functions. All volume-level changes may be con- figured to occur on soft ramp and zero cross transitions. The CS53L21 is available in a 32-pin QFN package in both Commercial (-10 to +70 C) and Automotive grades (-40 to +85 C). The CDB53L21 Customer Dem- onstration board is also available for device evaluation and implementation suggestions. Please see Ordering Information on page 63 for complete details. In addition to its many features, the CS53L21 operates from a low-voltage analog and digital core, making this A/D ideal for portable systems that require extremely low power consumption in a minimal amount of space. 2 DS700PP1