CS4245
104 dB, 24-Bit, 192 kHz Stereo Audio CODEC
D/A Features A/D Features
Multi-bit Delta Sigma Modulator
Multi-bit Delta Sigma Modulator
104 dB Dynamic Range
104 dB Dynamic Range
-90 dB THD+N
-95 dB THD+N
Up to 192 kHz Sampling Rates
Stereo 6:1 Input Multiplexer
Single-Ended Analog Architecture
Programmable Gain Amplifier (PGA)
Volume Control with Soft Ramp
12 dB Gain, 0.5 dB Step Size
0.5 dB Step Size
Zero Crossing, Click-Free Transitions
Zero Crossing, Click-Free Transitions
Popguard Technology Stereo Microphone Inputs
Minimizes the Effects of Output Transients +32 dB Gain Stage
Low-Noise Bias Supply
Filtered Line-Level Outputs
Selectable Serial Audio Interface Formats
Up to 192 kHz Sampling Rates
Left-Justified up to 24-bit
Selectable Serial Audio Interface Formats
IS up to 24-bit
Left-Justified up to 24-bit
Right-Justified 16-, 18-, 20-, and 24-bit
IS up to 24-bit
Selectable 50/15 s De-Emphasis
High-Pass Filter or DC Offset Calibration
Control Output for External Muting
1.8 V to 5 V 3.3 V to 5 V 3.3 V to 5 V
Volume Interpolation Multibit Switched Capacitor
Left DAC Output
Serial Control Filter Modulator DAC and Filter
Audio Mute
Mute Control
Input
Control
Volume Interpolation Multibit Switched Capacitor
Right DAC Output
DAC and Filter
Control Filter Modulator
2
I C/SPI
Left Aux Output
Control Data
MUX
Right Aux Output
Interrupt
Internal Voltage
Register Configuration
Reference
ADC Overflow
Stereo Input 1
Stereo Input 2
Reset
Stereo Input 3
Multibit
High Pass Low-Latency
PGA
Filter Anti-Alias Filter Oversampling
ADC
+32 dB
Serial
MUX
Stereo Input 4 /
Audio
Mic Input 1 & 2
Multibit
Output
+32 dB
High Pass Low-Latency
PGA
Oversampling
Filter Anti-Alias Filter
ADC
Stereo Input 5
Stereo Input 6
Copyright Cirrus Logic, Inc. 2012
AUG '12
(All Rights Reserved)
DS656F3
CS4245
System Features General Description
The CS4245 is a h ighly integrated stereo audio
Direct Interface with 1.8 V to 5 V Logic Levels
CODEC. The CS4245 performs stereo analog-to-digital
(A/D) and digital-to-analog (D/A) conversion of up to
Optional Asynchronous Serial Port Operation
24-bit serial values at sample rates up to 192 kHz.
Each Serial Port Supports Master or Slave
Operation
A 6:1 stereo input multiplexer is included for s electing
between line-level or microphone-level inputs. The mi-
Selectable Auxiliary Analog Output crophone input path includes a +32 dB gain stage and
a low-noise bias voltage supply. The PGA is available
Allows Analog Monitoring of Either the ADC
for line or microphone inputs and provides gain/attenu-
Input Signal after PGA or DAC Output
ation of 12 dB in 0.5 dB steps.
Signal
The output of the PGA is followed by an advanced 5th-
Internal Digital Loopback
order, multi-bit delta sigma modulator and digital filter-
ing/decimation. Sampled data is transmitted by the
Power-Down Mode
serial audio interface at rates from 4 kHz to 192 kHz in
either Slave or Master Mode.
Available for A/D, D/A, CODEC, Mic
Preamplifier
The D/A converter is based on a 4th-order multi-bit delta
sigma modulator with an ultra-linear low-pass filter and
+3.3 V to +5 V Analog Power Supply
offers a volume control that operates with a 0.5 dB step
size. It in corporates selectable soft ramp and zero
+3.3 V to +5 V Digital Power Supply
crossing transition functions to eliminate clicks and
pops.
TM
Supports IC and SPI Control Port
Standard 50/15s de-emphasis is availa ble for a
Interfaces
44.1 kHz sample rate for compatibility with digital audio
programs mastered using the 50/15s pre-emphasis
Pin-Compatible with CS5345
technique.
Integrated level translators allow easy interfacing be-
tween the CS4245 and other devices operating over a
wide range of logic levels.
The CS4245 is available in a 48-pin LQFP package in
both Commercial (-10 to +70 C) and Automotive (-40
to +105 C) grade. The CDB4245 Customer Demon-
stration board is also available for device evaluation and
implementation suggestions. Please see Ordering In-
formation on page 58 for complete details.
2 DS656F3