CS4385A 114-dB, 192-kHz 8-Channel D/A Converter Features Description Advanced Multi-bit Delta Sigma Architecture The CS4385A is a complete 8-channel digital-to-analog system. This D/A system includes digital de-emphasis, 24-bit Conversion half-dB step size volume control, ATAPI channel mix- Automatic Detection of Sample Rates up to ing, selectable fast and slow digital interpolation filters 192 kHz followed by an oversampled, multi-bit delta sigma mod- ulator which includes mismatch-shaping technology 114 dB Dynamic Range that eliminates distortion due to capacitor mismatch. Following this stage is a multi-element switched capac- -100 dB THD+N itor stage and low-pass filter with differential analog Direct Stream Digital (DSD) Mode outputs. Non-decimating Volume Control The CS4385A also has a proprietary DSD processor On-chip 50 kHz Filter that allows for volume control and 50 kHz on-chip filter- Matched PCM and DSD Analog Output Levels ing without an intermediate decimation stage. It also offers an optional path for direct DSD conversion by di- Compatible with Industry-standard Time rectly using the multi-element, switched capacitor array. Division Multiplexed (TDM) Serial Interface in both Hardware and Software Modes The CS4385A is available in a 48-pin LQFP package in both Commercial (-40C to +85C) and Automotive Selectable Digital Filters (-40C to +105C) grades. Please see Ordering Infor- Volume Control with 1/2 dB Step Size and Soft mation on page 53 for complete details. Ramp The CS4385A accepts PCM data at sample rates from Low Clock-jitter Sensitivity 4 kHz to 216 kHz, Direct Stream Digital audio data, and delivers excellent sound quality. These features are ide- +5 V Analog Supply, +2.5 V Digital Supply al for multi-channel audio systems, including SACD players, A/V receivers, digital TVs, mixing consoles, ef- Separate 1.8 to 5 V Logic Supplies for the fects processors, sound cards, and automotive audio Control & Serial Ports systems. Digital Supply = 2.5 V Analog Supply = 5 V Control Port Supply = 1.8 V to 5 V Hardware Mode or 2 I C/SPI Software Mode Control Data Internal Voltage Register/Hardware Reference Configuration Reset Serial Audio Port Supply = 1.8 V to 5 V Eight Channels Switch-Cap 8 Volume Digital Multi-bit of Differential DAC and PCM Serial 8 Controls Filters Modulators Outputs Analog Filters Audio Input 8 TDM Serial Audio Input DSD Processor External Mute Mute Signals -Volume control Control 2 DSD Audio -50 kHz filter Input Copyright Cirrus Logic, Inc. 2014 APRIL 14 (All Rights Reserved) CS4385A 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 - IC 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 .................................................................................................................................. 24 4.3.4 OLM 4 .................................................................................................................................. 25 4.3.5 TDM ....................................................................................................................................... 25 4.4 Oversampling Modes ...................................................................................................................... 25 4.5 Interpolation Filter ........................................................................................................................... 26 4.6 De-Emphasis .................................................................................................................................. 26 4.7 ATAPI Specification ........................................................................................................................ 27 4.8 Direct Stream Digital (DSD) Mode .................................................................................................. 27 4.9 Grounding and Power Supply Arrangements ................................................................................. 28 4.9.1 Capacitor Placement ............................................................................................................. 28 4.10 Analog Output and Filtering .......................................................................................................... 29 4.11 The MUTEC Outputs .................................................................................................................... 30 4.12 Recommended Power-Up Sequence ........................................................................................... 30 4.12.1 Hardware Mode ................................................................................................................... 30 4.12.2 Software Mode .................................................................................................................... 31 4.13 Recommended Procedure for Switching Operational Modes ....................................................... 31 5. CONTROL PORT INTERFACE ............................................................................................................ 32 5.1 MAP Auto Increment ...................................................................................................................... 32 5.2 IC Mode ......................................................................................................................................... 32 5.2.1 IC Write ................................................................................................................................ 32 5.2.2 IC Read ................................................................................................................................ 32 5.3 SPI Mode ........................................................................................................................................ 33 5.3.1 SPI Write ............................................................................................................................... 33 5.4 Memory Address Pointer (MAP) .................................................................................................... 34 5.4.1 INCR (Auto Map Increment Enable) ...................................................................................... 34 5.4.2 MAP4-0 (Memory Address Pointer) ......................................................................................34 6. REGISTER QUICK REFERENCE ....................................................................................................... 35 7. REGISTER DESCRIPTION .................................................................................................................. 37 7.1 Chip I.D. and Revision (Address 01h) ............................................................................................ 37 7.1.1 Chip I.D. Read Only ............................................................................................................ 37 2 DS837F2