CS53L21 Low-Power, Stereo Analog-to-Digital Converter FEATURES SYSTEM FEATURES 98-dB dynamic range (A-weighted) 24-bit conversion 88-dB THD+N 496 kHz sample rate Analog gain controls Multibit deltasigma architecture +32-dB or +16-dB mic preamps 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 Programmable automatic level control (ALC) mW 1.8 V Noise gate for noise suppression Variable power supplies Programmable threshold and 1.82.5-V digital and analog attack/release rates 1.83.3-V interface logic Independent left/right channel control Digital volume control Power down management High-pass filter disable for DC measurements ADC, mic preamplifier, PGA Stereo 3:1 analog input MUX Software Mode (IC and SPI control) Dual mic inputs Programmable, low noise mic bias levels Hardware Mode (standalone control) Differential mic mix for common mode Flexible clocking options noise rejection Master or slave operation Very low 64 Fs oversampling clock reduces Digital routing mixes power consumption Mono mixes 1.8Vto3.3V 1.8Vto2.5V Digital HardwareMode 2 Signal orI C&SPI SoftwareMode Processing ALC Engine ControlData StereoInput1 Multibit StereoInput2 Reset MUX Oversampling PGA ADC +32dB HighPass Volume MUX SerialAudio StereoInput3/ Filters Controls Output MicInput1&2 Multibit +32dB Oversampling MUX PGA ADC MIC Register Bias ALC Configuration Copyright Cirrus Logic, Inc. 20052015 DS700F1 (All Rights Reserved) JUL 15 CS53L21 APPLICATIONS GENERAL DESCRIPTION The CS53L21 is a highly integrated, 24-bit, 96-kHz, low Portable audio players power stereo A/D. Based on multibit, deltasigma 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 preamp 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 features a digital volume attenuator with soft ramp transitions. A programmable ALC and Noise Gate monitor 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 Demonstration board is also available for device evalu- ation and implementation suggestions. Please see Ordering Information on page 56 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 DS700F1