Cirrus Logic CS4385A - Manual

Copyright  Cirrus Logic, Inc. 2014
(All Rights Reserved)
http://www.cirrus.com
114-dB, 192-kHz 8-Channel D/A Converter
Features
 Advanced Multi-bit Delta Sigma Architecture
 24-bit Conversion
 Automatic Detection of Sample Rates up to
192 kHz
 114 dB Dynamic Range
 -100 dB THD+N
 Direct Stream Digital ® (DSD) Mode
– Non-decimating Volume Control
– On-chip 50 kHz Filter
– Matched PCM and DSD Analog Output Levels
 Compatible with Industry-standard Time
Division Multiplexed (TDM) Serial Interface in
both Hardware and Software Modes
 Selectable Digital Filters
 Volume Control with 1/2 dB Step Size and Soft
Ramp
 Low Clock-jitter Sensitivity
 +5 V Analog Supply, +2.5 V Digital Supply
 Separate 1.8 to 5 V Logic Supplies for the
Control & Serial Ports
Description
The CS4385A is a complete 8-channel digital-to-analog
system. This D/A system includes digital de-emphasis,
half-dB step size volume control, ATAPI channel mix-
ing, selectable fast and slow digital interpolation filters
followed by an oversampled, multi-bit delta sigma mod-
ulator which includes mismatch-shaping technology
that eliminates distortion due to capacitor mismatch.
Following this stage is a multi-element switched capac-
itor stage and low-pass filter with differential analog
outputs.
The CS4385A also has a proprietary DSD processor
that allows for volume control and 50 kHz on-chip filter-
ing without an intermediate decimation stage. It also
offers an optional path for direct DSD conversion by di-
rectly using the multi-element, switched capacitor array.
The CS4385A is available in a 48-pin LQFP package in
both Commercial (-40°C to +85°C) and Automotive
(-40°C to +105°C) grades. Please see
“Ordering Infor-
mation” on page 53 for complete details.
The CS4385A accepts PCM data at sample rates from
4 kHz to 216 kHz, Direct Stream Digital
audio data, and
delivers excellent sound quality. These features are ide-
al for multi-channel audio systems, including SACD
players, A/V receivers, digital TV’s, mixing consoles, ef-
fects processors, sound cards, and automotive audio
systems.
Control Port Supply = 1.8 V to 5 V
Register/Hardware
Configuration
Internal Voltage
Reference
Reset
Se
rial In
terfa
ce
Le
ve
l Tr
an
slat
or
Le
ve
l T
ransla
tor
TDM Serial
Audio Input
Digital Supply = 2.5 V
Hardware Mode or
I 2 C/SPI Software Mode
Control Data
Analog Supply = 5 V
Eight Channels
of Differential
Outputs
8
8
PCM Serial
Audio Input
Volume
Controls
Digital
Filters
Switch-Cap
DAC and
Analog Filters
Multi-bit 
Modulators
DSD Audio
Input
DSD Processor
-Volume control
-50 kHz filter
External Mute
Control
Mute Signals
2
8
Serial Audio Port
Supply = 1.8 V to 5 V
APRIL '14
DS837F2
CS4385A