16-Bit PCM Audio DAC Data Sheet AD1856 FEATURES FUNCTIONAL BLOCK DIAGRAM R F 0.0025% THD Fast settling permits 2, 4, and 8 oversampling 16-BIT REFERENCE 3 V output I DAC OUT Optional trim allows superlinear performance AUDIO OUTPUT 5 V to 12 V operation 16-BIT INPUT LATCH 16-lead plastic SOIC package Serial input 16-BIT SERIAL-TO-PARALLEL APPLICATIONS CONVERSION CLK LE DATA Compact disc players Digital audio amplifiers Figure 1. DAT recorders and players Synthesizers and keyboards GENERAL DESCRIPTION The AD1856 is a monolithic, 16-bit pulse code modulation (PCM) The AD1856 can operate with 5 V to 12 V power supplies, audio DAC. The device provides a voltage output amplifier, 16-bit making it suitable for both the portable and home-use markets. DAC, 16-bit serial-to-parallel input register, and voltage reference. The digital supplies, +V and V , can be separated from the L L The digital portion of the AD1856 is fabricated with CMOS logic analog supplies, +V and V , for reduced digital crosstalk. S S elements that are provided by the Analog Devices, Inc., BiMOS II Separate analog and digital ground pins are also provided. process. The analog portion of the AD1856 is fabricated with Power dissipation is 110 mW (typical) with 5 V supplies and bipolar and MOS devices, as well as thin film resistors. 135 mW (typical) when 12 V supplies are used. This combination of circuit elements, as well as careful design and The AD1856 is packaged in a 16-lead plastic SOIC package layout techniques, results in high performance audio playback. and incorporates the industry-standard pinout. Operation is Laser trimming of the linearity error affords extremely low total guaranteed over the temperature range of 25C to +70C and harmonic distortion. An optional linearity trim pin is provided over the voltage supply range of 4.75 V to 13.2 V. to allow residual differential linearity error at midscale to be PRODUCT HIGHLIGHTS eliminated. This feature is particularly valuable for low distortion reconstructions of low amplitude signals. Output glitch is also 1. Total harmonic distortion is 100% tested. small, contributing to the overall high level of performance. The 2. MSB trim feature allows superlinear operation. output amplifier achieves fast settling and high slew rates, providing 3. The AD1856 operates with 5 V to 12 V supplies. a full 3 V signal at load currents of up to 8 mA. The output 4. Serial interface is compatible with digital filter chips. amplifier is short-circuit protected and can withstand indefinite 5. 1.5 s settling time permits 2, 4, and 8 oversampling. shorts to ground. 6. No external components are required. 7. 96 dB dynamic range. The serial input interface consists of the clock, data, and latch 8. 3 V or 8 mA output capability. enable pins. The serial twos complement data-word is clocked 9. 16-bit resolution. into the DAC, MSB first, by the external data clock. The latch 10. Twos complement serial input words. enable signal transfers the input word from the internal serial input 11. Low cost. register to the parallel DAC input register. The input clock can 12. 16-lead plastic SOIC package. support a 10 MHz clock rate. The serial input port is compatible with popular digital filter chips used in consumer audio products. These filters operate at oversampling rates of 2, 4, and 8 the sampling frequency. Rev. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 19882013 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 00759-001AD1856 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Power Supplies and Decoupling ..................................................9 Applications ....................................................................................... 1 Total Harmonic Distortion ..........................................................9 Functional Block Diagram .............................................................. 1 Optional MSB Adjustment ........................................................ 10 General Description ......................................................................... 1 Digital Circuit Considerations ...................................................... 11 Product Highlights ........................................................................... 1 Input Data ................................................................................... 11 Revision History ............................................................................... 2 Applications of the AD1856 PCM Audio DAC .......................... 12 Specifications ..................................................................................... 3 One DAC per System ................................................................. 12 Absolute Maximum Ratings ............................................................ 5 One DAC per Channel .............................................................. 12 ESD Caution .................................................................................. 5 Two DACs per Channel (Four-DAC System) ........................ 13 Pin Configuration and Function Descriptions ............................. 6 Digital Filtering and Oversampling ............................................. 14 Terminology ...................................................................................... 7 Achieving 8 fS Oversampling with Two AD1856 Devices and the Yamaha YM3414 .......................................................... 14 Theory of Operation ........................................................................ 8 Outline Dimensions ....................................................................... 15 Analog Circuit Considerations ....................................................... 9 Ordering Guide .......................................................................... 15 Grounding Recommendations ................................................... 9 REVISION HISTORY 2/13Rev. B to Rev. C Changes to Table 2 ............................................................................. 5 Updated Format .................................................................. Universal Changes to Figure 2 and Table 3...................................................... 6 Deleted 16-Lead DIP (N) Package ................................... Universal Deleted Figure 14 and Dual DAC, 4 f Oversampling S Reorganized Layout ............................................................ Universal Architecture Section .......................................................................... 7 Changes to Features Section, General Description Changes to Grounding Recommendations Section, Section, and Product Highlights Section ...................................... 1 Power Supplies and Decoupling Section, and Figure 3 ................ 9 Changes to Total Harmonic Distortion Parameter Changes to Input Data Section ..................................................... 11 and Power Supply Parameter, Table 1 ............................................ 3 Changes to Digital Filtering and Oversampling Section .......... 14 Changes to Power Dissipation Parameter, Table 1 ....................... 4 Updated Outline Dimensions ....................................................... 15 Deleted Figure 1 Renumbered Sequentially................................. 4 Changes to Ordering Guide .......................................................... 15 Rev. C Page 2 of 16