4:2*
CS42438
108 dB, 192 kHz 6-In, 8-Out TDM CODEC
FEATURES GENERAL DESCRIPTION
The CS42438 CODEC provides six multi-bit ana-
Six 24-bit A/D, Eight 24-bit D/A Converters
log-to-digital and eight multi-bit digital-to-analog
ADC Dynamic Range
delta-sigma converters. The CODEC is capable of op-
105 dB Differential eration with eitherdifferential or single-ended inputs
and outputs, in a 52-pin MQFP 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.
DAC Sampling Rates up to 192 kHz
The CS42438 is available in a 52-pin MQFP package in
Commercial (-10C to +70C) and Automotive (-40C to
ADC Sampling Rates up to 96 kHz
+105C) grades. The CDB42438 Customer Demonstra-
Programmable ADC High-Pass Filter for DC
tion Board is also available for device evaluation and
Offset Calibration
implementation suggestions. Please refer to Ordering
Information on page61 for complete ordering
Logarithmic Digital Volume Control
information.
Hardware Mode or Software IC and SPI
The CS42438 is ideal for audio systems requiring wide
dynamic range, negligible distortion and low noise, such
Supports Logic Levels Between 5 V and 1.8 V
as A/V receivers, DVD receivers, and automotive audio
systems.
Control Port & Serial
Digital Supply = Analog Supply =
Audio Port Supply =
3.3 V 3.3 V to 5 V
1.8 V to 5 V
Hardware Mode or
2
I C/SPI Software Mode
Control Data
Internal Voltage
Register
Reference
Configuration
Reset
Multibit Differential or
8
TDM Serial Audio
Volume Digital
Single-Ended
DAC1-4 and
Input
Controls Filters Modulators
Outputs
Analog Filters
8
Auxilliary Serial
Audio Input
Multibit
High Pass Digital
Input Master Oversampling 4
Filter Filters
Clock ADC1&2
Differential or
4
Single-Ended
Multibit
Analog Inputs
TDM Serial Audio High Pass Digital
Oversampling 2
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)
DS646F4
CS42438
TABLE OF CONTENTS
1. PIN DESCRIPTIONS - SOFTWARE MODE ......................................................................................... 6
1.1 Digital I/O Pin Characteristics ........................................................................................................... 8
2. PIN DESCRIPTIONS - HARDWARE MODE ....................................................................................... 9
3. TYPICAL CONNECTION DIAGRAMS .................................................................................................11
4. CHARACTERISTICS AND SPECIFICATIONS .................................................................................... 13
RECOMMENDED OPERATING CONDITIONS ................................................................................... 13
ABSOLUTE MAXIMUM RATINGS .......................................................................................................13
ANALOG INPUT CHARACTERISTICS (COMMERCIAL) .................................................................... 14
ANALOG INPUT CHARACTERISTICS (AUTOMOTIVE) ..................................................................... 15
ADC DIGITAL FILTER CHARACTERISTICS ....................................................................................... 16
ANALOG OUTPUT CHARACTERISTICS (COMMERCIAL) ................................................................17
ANALOG OUTPUT CHARACTERISTICS (AUTOMOTIVE) ................................................................. 18
COMBINED DAC INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE .............................. 20
SWITCHING SPECIFICATIONS - ADC/DAC PORT ............................................................................ 21
SWITCHING CHARACTERISTICS - AUX PORT ................................................................................. 22
SWITCHING SPECIFICATIONS - CONTROL PORT - IC MODE ....................................................... 23
SWITCHING SPECIFICATIONS - CONTROL PORT - SPI FORMAT ................................................. 24
DC ELECTRICAL CHARACTERISTICS .............................................................................................. 25
DIGITAL INTERFACE SPECIFICATIONS & CHARACTERISTICS ..................................................... 25
5. APPLICATIONS ................................................................................................................................... 26
5.1 Overview ......................................................................................................................................... 26
5.2 Analog Inputs .................................................................................................................................. 27
5.2.1 Line-Level Inputs ................................................................................................................... 27
5.2.1.1 Hardware Mode ......................................................................................................... 27
5.2.1.2 Software Mode ........................................................................................................... 27
5.2.2 ADC3 Analog Input ................................................................................................................ 28
5.2.3 Hardware Mode ..................................................................................................................... 29
5.2.4 Software Mode ...................................................................................................................... 29
5.2.5 High-Pass Filter and DC Offset Calibration ........................................................................... 29
5.2.5.1 Hardware Mode ......................................................................................................... 29
5.2.5.2 Software Mode ........................................................................................................... 29
5.3 Analog Outputs ............................................................................................................................... 30
5.3.1 Initialization ............................................................................................................................ 30
5.3.2 Line-Level Outputs and Filtering ........................................................................................... 30
5.3.3 Digital Volume Control ........................................................................................................... 32
5.3.3.1 Hardware Mode ......................................................................................................... 32
5.3.3.2 Software Mode ........................................................................................................... 32
5.3.4 De-Emphasis Filter ................................................................................................................ 32
5.4 System Clocking ............................................................................................................................. 33
5.4.1 Hardware Mode ..................................................................................................................... 33
5.4.2 Software Mode ...................................................................................................................... 33
5.5 CODEC Digital Interface ................................................................................................................. 33
5.5.1 TDM ................................................................................................................................. 33
5.5.2 I/O Channel Allocation ........................................................................................................... 34
5.6 AUX Port Digital Interface Formats ................................................................................................ 34
5.6.1 Hardware Mode ..................................................................................................................... 34
5.6.2 Software Mode ...................................................................................................................... 34
5.6.3 IS .......................................................................................................................................... 34
5.6.4 Left-Justified .......................................................................................................................... 35
5.7 Control Port Description and Timing ............................................................................................... 35
5.7.1 SPI Mode ............................................................................................................................... 35
5.7.2 IC Mode ................................................................................................................................ 36
2 DS646F4