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Cirrus Logic

CS4385 Datasheet Preview

CS4385 Datasheet

192 kHz 8-Channel D/A Converter

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CS4385
114 dB, 192 kHz 8-Channel D/A Converter
Features
Description
 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 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
 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 and Serial Ports
The CS4385 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 CS4385 also has a proprietary DSD processor
which allows for volume control and 50 kHz on-chip fil-
tering 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 CS4385 is available in a 48-pin LQFP package in
both Commercial (-40°C to +85°C) and Automotive
(-40°C to +105°C) grades. The CDB4385 Customer
Demonstration board is also available for device evalu-
ation and implementation suggestions. Please see
“Ordering Information” on page 54 for complete details.
The CS4385 accepts PCM data at sample rates from
4 kHz to 216 kHz, DSD audio data, and delivers excel-
lent sound quality. These features are ideal for multi-
channel audio systems, including SACD players, A/V
receivers, digital TV’s, mixing consoles, effects proces-
sors, sound cards, and automotive audio systems.
Control Port Supply = 1.8 V to 5 V
Digital Supply = 2.5 V
Analog Supply = 5 V
Hardware Mode or
I2C/SPI Software Mode
Control Data
Reset
Serial Audio Port
Supply = 1.8 V to 5 V
PCM Serial
Audio Input
TDM Serial
Audio Input
DSD Audio
Input
Register/Hardware
Configuration
Internal Voltage
Reference
Volume
8 Controls
Digital
Filters
Multi-bit ΔΣ
Modulators
DSD Processor
-Volume control
-50 kHz filter
Switch-Cap
DAC and
Analog Filters
8
Eight Channels
of Differential
Outputs
8
External Mute
Control
2
Mute Signals
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2008
(All Rights Reserved)
FEB '08
DS671F2




Cirrus Logic

CS4385 Datasheet Preview

CS4385 Datasheet

192 kHz 8-Channel D/A Converter

No Preview Available !

CS4385
TABLE OF CONTENTS
1. PIN DESCRIPTION
...................................................................................................................... 6
2. CHARACTERISTICS AND SPECIFICATIONS ...................................................................................... 8
RECOMMENDED OPERATING CONDITIONS ..................................................................................... 8
ABSOLUTE MAXIMUM RATINGS ......................................................................................................... 8
DAC ANALOG CHARACTERISTICS - COMMERCIAL (-CQZ) ............................................................. 9
DAC ANALOG CHARACTERISTICS - AUTOMOTIVE (-DQZ) ............................................................ 10
POWER AND THERMAL CHARACTERISTICS .................................................................................. 11
COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE ...................................... 12
COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE (CONTINUED) .............. 13
DSD COMBINED DIGITAL & ON-CHIP ANALOG FILTER RESPONSE ............................................. 13
DIGITAL CHARACTERISTICS ............................................................................................................. 14
SWITCHING CHARACTERISTICS - PCM ........................................................................................... 15
SWITCHING CHARACTERISTICS - DSD ........................................................................................... 16
SWITCHING CHARACTERISTICS - CONTROL PORT - I²C FORMAT .............................................. 17
SWITCHING CHARACTERISTICS - CONTROL PORT - SPI FORMAT ............................................. 18
3. TYPICAL CONNECTION DIAGRAM ................................................................................................... 19
4. APPLICATIONS ................................................................................................................................... 21
4.1 Master Clock ................................................................................................................................... 21
4.2 Mode Select .................................................................................................................................... 22
4.3 Digital Interface Formats ................................................................................................................ 23
4.3.1 OLM #1 .................................................................................................................................. 24
4.3.2 OLM #2 .................................................................................................................................. 24
4.3.3 OLM #3 .................................................................................................................................. 25
4.3.4 OLM #4 .................................................................................................................................. 25
4.3.5 TDM ....................................................................................................................................... 26
4.4 Oversampling Modes ...................................................................................................................... 26
4.5 Interpolation Filter ........................................................................................................................... 26
4.6 De-Emphasis .................................................................................................................................. 27
4.7 ATAPI Specification ........................................................................................................................ 27
4.8 Direct Stream Digital (DSD) Mode .................................................................................................. 28
4.9 Grounding and Power Supply Arrangements ................................................................................. 29
4.9.1 Capacitor Placement ............................................................................................................. 29
4.10 Analog Output and Filtering .......................................................................................................... 29
4.11 The MUTEC Outputs .................................................................................................................... 30
4.12 Recommended Power-Up Sequence ........................................................................................... 31
4.12.1 Hardware Mode ................................................................................................................... 31
4.12.2 Software Mode .................................................................................................................... 32
4.13 Recommended Procedure for Switching Operational Modes ....................................................... 32
4.14 Control Port Interface ................................................................................................................... 32
4.14.1 MAP Auto Increment ........................................................................................................... 32
4.14.2 I²C Mode .............................................................................................................................. 32
4.14.2.1 I²C Write ................................................................................................................... 33
4.14.2.2 I²C Read .................................................................................................................. 33
4.14.3 SPI Mode ............................................................................................................................. 34
4.14.3.1 SPI Write .................................................................................................................. 34
4.15 Memory Address Pointer (MAP) .................................................................................................. 34
4.15.1 INCR (Auto Map Increment Enable) .................................................................................... 34
4.15.2 MAP4-0 (Memory Address Pointer) .................................................................................... 34
5. REGISTER QUICK REFERENCE ....................................................................................................... 35
6. REGISTER DESCRIPTION .................................................................................................................. 37
6.1 Chip Revision (address 01h) ......................................................................................................... 37
6.1.1 Part Number ID (PART) [Read Only] .................................................................................... 37
2 DS671F2


Part Number CS4385
Description 192 kHz 8-Channel D/A Converter
Maker Cirrus Logic
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CS4385 Datasheet PDF





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