4:2*
CS42448
108 dB, 192 kHz 6-In, 8-Out CODEC
FEATURES GENERAL DESCRIPTION
Six 24-bit A/D, Eight 24-bit D/A Converters The CS42448 CODEC provides six multi-bit ana-
log-to-digital and eight multi-bit digital-to-analog
ADC Dynamic Range
delta-sigma converters. The CODEC is capable of op-
eration with either differential or single-ended inputs
105 dB Differential
and outputs, in a 64-pin LQFP package.
102 dB Single-Ended
Six fully differential, or single-ended, inputs are avail-
DAC Dynamic Range
able on stereo ADC1, ADC2, and ADC3. When
108 dB Differential operating in Single-Ended Mode, an internal MUX be-
fore ADC3 allows selection from up to four single-ended
105 dB Single-Ended
inputs. Digital volume control is provided for each ADC
ADC/DAC THD+N channel, with selectable overflow detection.
-98 dB Differential
All eight DAC channels provide digital volume control
-95 dB Single-Ended
and can operate with differential or single-ended
outputs.
Compatible with Industry-Standard Time
An auxiliary serial input is available for an additional two
Division Multiplexed (TDM) Serial Interface
channels of PCM data.
System Sampling Rates up to 192 kHz The CS42448 is available in a 64-pin LQFP package in
Commercial (-10C to +70C) and Automotive (-40C to
Programmable ADC High-Pass Filter for DC
+105C) grades. The CDB42448 Customer Demonstra-
Offset Calibration
tion Board is also available for device evaluation and
implementation suggestions. Please refer to Ordering
Logarithmic Digital Volume Control
Information on page65 for complete ordering
information.
IC & SPI Host Control Port
The CS42448 is ideal for audio systems requiring wide
Supports Logic Levels Between 5 V and 1.8 V dynamic range, negligible distortion and low noise, such
as A/V receivers, DVD receivers, and automotive audio
Popguard Technology
systems.
Control Port & Serial
Digital Supply Analog Supply =
Audio Port Supply =
= 3.3 V to 5 V 3.3 V to 5 V
1.8 V to 5 V
2
I C/SPI
Software Mode
Register
Internal Voltage
Control Data
Configuration
Reference
External
Mute
ADC Overflow Mute Control
Interrupt Control
& Clock Error
Reset
Interrupt
Multibit Differential or
Serial Audio Volume 8
Digital
Single-Ended
DAC1-4 and
Input Controls
Filters Modulators
Analog Filters Outputs
8
Auxilliary Serial
Audio Input
Multibit
High Pass Digital
4
Oversampling
Input Master
Filter Filters
ADC1&2
Clock
4
Differential or Single-
Ended Analog Inputs
Multibit
High Pass
Serial Audio Digital
2
Oversampling
Output Filter Filters
ADC3
2
*Optional MUX allows selection from up to 4 single-ended inputs.
Copyright Cirrus Logic, Inc. 2013 NOV '13
(All Rights Reserved)
DS648F4
CS42448
TABLE OF CONTENTS
1. PIN DESCRIPTIONS ...................................................................................................................... 6
1.1 Digital I/O Pin Characteristics .......................................................................................................... 8
2. TYPICAL CONNECTION DIAGRAM ..................................................................................................... 9
3. CHARACTERISTICS AND SPECIFICATIONS .................................................................................... 10
RECOMMENDED OPERATING CONDITIONS ................................................................................... 10
ABSOLUTE MAXIMUM RATINGS .......................................................................................................10
ANALOG INPUT CHARACTERISTICS (COMMERCIAL) .................................................................... 11
ANALOG INPUT CHARACTERISTICS (AUTOMOTIVE) ..................................................................... 12
ADC DIGITAL FILTER CHARACTERISTICS ....................................................................................... 13
ANALOG OUTPUT CHARACTERISTICS (COMMERCIAL) ................................................................14
ANALOG OUTPUT CHARACTERISTICS (AUTOMOTIVE) ................................................................. 15
COMBINED DAC INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE .............................. 17
SWITCHING SPECIFICATIONS - ADC/DAC PORT ............................................................................ 18
SWITCHING CHARACTERISTICS - AUX PORT ................................................................................. 20
SWITCHING SPECIFICATIONS - CONTROL PORT - IC MODE ....................................................... 21
SWITCHING SPECIFICATIONS - CONTROL PORT - SPI FORMAT ................................................. 22
DC ELECTRICAL CHARACTERISTICS .............................................................................................. 23
DIGITAL INTERFACE SPECIFICATIONS & CHARACTERISTICS ..................................................... 24
4. APPLICATIONS ................................................................................................................................... 25
4.1 Overview ......................................................................................................................................... 25
4.2 Analog Inputs .................................................................................................................................. 25
4.2.1 Line-Level Inputs ................................................................................................................... 25
4.2.2 ADC3 Analog Input ................................................................................................................ 26
4.2.3 High-Pass Filter and DC Offset Calibration ........................................................................... 27
4.3 Analog Outputs ............................................................................................................................... 27
4.3.1 Initialization ............................................................................................................................ 27
4.3.2 Output Transient Control ....................................................................................................... 29
4.3.3 Popguard ............................................................................................................................... 29
4.3.3.1 Power-Up ................................................................................................................... 29
4.3.3.2 Power-Down .............................................................................................................. 29
4.3.4 Mute Control .......................................................................................................................... 29
4.3.5 Line-Level Outputs and Filtering ........................................................................................... 30
4.3.6 Digital Volume Control ........................................................................................................... 30
4.3.7 De-Emphasis Filter ................................................................................................................ 30
4.4 System Clocking ............................................................................................................................. 31
4.5 CODEC Digital Interface Formats .................................................................................................. 32
4.5.1 IS .......................................................................................................................................... 33
4.5.2 Left-Justified .......................................................................................................................... 33
4.5.3 Right-Justified ........................................................................................................................ 33
4.5.4 OLM #1 .................................................................................................................................. 33
4.5.5 OLM #2 .................................................................................................................................. 34
4.5.6 TDM ....................................................................................................................................... 34
4.5.7 I/O Channel Allocation ........................................................................................................... 35
4.6 AUX Port Digital Interface Formats ................................................................................................ 35
4.6.1 IS .......................................................................................................................................... 35
4.6.2 Left-Justified .......................................................................................................................... 36
4.7 Control Port Description and Timing ............................................................................................... 36
4.7.1 SPI Mode ............................................................................................................................... 36
4.7.2 IC Mode ................................................................................................................................ 37
4.8 Interrupts ........................................................................................................................................ 38
4.9 Recommended Power-Up Sequence ............................................................................................. 39
4.10 Reset and Power-Up .................................................................................................................... 39
2 DS648F4