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