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Analog Devices Semiconductor Electronic Components Datasheet



AD1856

16-Bit PCM Audio DAC


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AD1856 pdf
Data Sheet
FEATURES
0.0025% THD
Fast settling permits 2×, 4×, and 8× oversampling
±3 V output
Optional trim allows superlinear performance
±5 V to ±12 V operation
16-lead plastic SOIC package
Serial input
APPLICATIONS
Compact disc players
Digital audio amplifiers
DAT recorders and players
Synthesizers and keyboards
GENERAL DESCRIPTION
The AD1856 is a monolithic, 16-bit pulse code modulation (PCM)
audio DAC. The device provides a voltage output amplifier, 16-bit
DAC, 16-bit serial-to-parallel input register, and voltage reference.
The digital portion of the AD1856 is fabricated with CMOS logic
elements that are provided by the Analog Devices, Inc., BiMOS II
process. The analog portion of the AD1856 is fabricated with
bipolar and MOS devices, as well as thin film resistors.
This combination of circuit elements, as well as careful design and
layout techniques, results in high performance audio playback.
Laser trimming of the linearity error affords extremely low total
harmonic distortion. An optional linearity trim pin is provided
to allow residual differential linearity error at midscale to be
eliminated. This feature is particularly valuable for low distortion
reconstructions of low amplitude signals. Output glitch is also
small, contributing to the overall high level of performance. The
output amplifier achieves fast settling and high slew rates, providing
a full ±3 V signal at load currents of up to ±8 mA. The output
amplifier is short-circuit protected and can withstand indefinite
shorts to ground.
The serial input interface consists of the clock, data, and latch
enable pins. The serial twos complement data-word is clocked
into the DAC, MSB first, by the external data clock. The latch
enable signal transfers the input word from the internal serial input
register to the parallel DAC input register. The input clock can
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.
16-Bit PCM Audio DAC
AD1856
FUNCTIONAL BLOCK DIAGRAM
RF
REFERENCE
16-BIT
IOUT DAC
16-BIT INPUT LATCH
AUDIO
OUTPUT
16-BIT SERIAL-TO-PARALLEL
CONVERSION
CLK
LE DATA
Figure 1.
The AD1856 can operate with ±5 V to ±12 V power supplies,
making it suitable for both the portable and home-use markets.
The digital supplies, +VL and −VL, can be separated from the
analog supplies, +VS and −VS, for reduced digital crosstalk.
Separate analog and digital ground pins are also provided.
Power dissipation is 110 mW (typical) with ±5 V supplies and
135 mW (typical) when ±12 V supplies are used.
The AD1856 is packaged in a 16-lead plastic SOIC package
and incorporates the industry-standard pinout. Operation is
guaranteed over the temperature range of −25°C to +70°C and
over the voltage supply range of ±4.75 V to ±13.2 V.
PRODUCT HIGHLIGHTS
1. Total harmonic distortion is 100% tested.
2. MSB trim feature allows superlinear operation.
3. The AD1856 operates with ±5 V to ±12 V supplies.
4. Serial interface is compatible with digital filter chips.
5. 1.5 μs settling time permits 2×, 4×, and 8× oversampling.
6. No external components are required.
7. 96 dB dynamic range.
8. ±3 V or ±8 mA output capability.
9. 16-bit resolution.
10. Twos complement serial input words.
11. Low cost.
12. 16-lead plastic SOIC package.
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
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©1988–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com



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AD1856 pdf
AD1856
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Terminology ...................................................................................... 7
Theory of Operation ........................................................................ 8
Analog Circuit Considerations ....................................................... 9
Grounding Recommendations ................................................... 9
REVISION HISTORY
2/13—Rev. B to Rev. C
Updated Format..................................................................Universal
Deleted 16-Lead DIP (N) Package ...................................Universal
Reorganized Layout............................................................Universal
Changes to Features Section, General Description
Section, and Product Highlights Section ...................................... 1
Changes to Total Harmonic Distortion Parameter
and Power Supply Parameter, Table 1 ............................................ 3
Changes to Power Dissipation Parameter, Table 1....................... 4
Deleted Figure 1; Renumbered Sequentially................................. 4
Data Sheet
Power Supplies and Decoupling..................................................9
Total Harmonic Distortion ..........................................................9
Optional MSB Adjustment........................................................ 10
Digital Circuit Considerations...................................................... 11
Input Data ................................................................................... 11
Applications of the AD1856 PCM Audio DAC.......................... 12
One DAC per System................................................................. 12
One DAC per Channel .............................................................. 12
Two DACs per Channel (Four-DAC System) ........................ 13
Digital Filtering and Oversampling ............................................. 14
Achieving 8× fS Oversampling with Two AD1856 Devices
and the Yamaha YM3414 .......................................................... 14
Outline Dimensions ....................................................................... 15
Ordering Guide .......................................................................... 15
Changes to Table 2.............................................................................5
Changes to Figure 2 and Table 3......................................................6
Deleted Figure 14 and Dual DAC, 4× fS Oversampling
Architecture Section..........................................................................7
Changes to Grounding Recommendations Section,
Power Supplies and Decoupling Section, and Figure 3 ................9
Changes to Input Data Section ..................................................... 11
Changes to Digital Filtering and Oversampling Section .......... 14
Updated Outline Dimensions....................................................... 15
Changes to Ordering Guide .......................................................... 15
Rev. C | Page 2 of 16



Part Number AD1856
Description 16-Bit PCM Audio DAC
Maker Analog Devices - Analog Devices
Total Page 16 Pages
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