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부품번호 AD1856 기능
기능 16-Bit PCM Audio DAC
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AD1856 데이터시트, 핀배열, 회로
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




AD1856 pdf, 반도체, 판매, 대치품
AD1856
Parameter
POWER DISSIPATION
TEMPERATURE RANGE
Specification
Operational
Storage
1 Tested on all production units at final test.
Test Conditions/Comments
10 MHz clock
±VS and ±VL = ±5 V
±VS and ±VL = ±12 V
Min Typ
110
135
0
−25
−60
Data Sheet
Max
1501
+70
+70
+100
Unit
mW
mW
°C
°C
°C
Rev. C | Page 4 of 16

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AD1856 전자부품, 판매, 대치품
Data Sheet
TERMINOLOGY
Total Harmonic Distortion
Total harmonic distortion (THD) is defined as the ratio of the
square root of the sum of the squares of the harmonic values to
the value of the fundamental input frequency. THD is expressed
in percent (%) or decibels (dB).
THD is a measure of the magnitude and distribution of linearity
error and differential linearity error. The distribution of these
errors may be different, depending on the amplitude of the output
signal. Therefore, to be most useful, THD should be specified for
both large and small signal amplitudes.
Settling Time
Settling time is the time required for the output to reach and
remain within a specified error band about its final value, mea-
sured from the digital input transition. Settling time is the primary
measure of dynamic performance.
Dynamic Range
The dynamic range specification indicates the ratio of the small-
est signal that the converter can resolve to the largest signal it is
able to produce. As a ratio, it is usually expressed in decibels (dB).
AD1856
The theoretical dynamic range of an n-bit converter is approx-
imately (6 × n) dB. In the case of the 16-bit AD1856, that is
96 dB. The actual dynamic range of a converter is less than the
theoretical value due to limitations imposed by noise, quantiza-
tion error, and other errors.
Bipolar Zero Error
Bipolar zero error is the deviation in the actual analog output
from the ideal output (0 V) when the twos complement input
code representing half scale (all 0s) is loaded into the input
register.
Differential Linearity Error
Differential linearity error is the measure of the variation in
analog value, normalized to full scale, associated with a 1 LSB
change in the digital input. Monotonic behavior requires that
the differential linearity error not exceed 1 LSB in the negative
direction.
Monotonicity
A digital-to-analog converter is monotonic if the output either
increases or remains constant as the digital input increases.
Rev. C | Page 7 of 16

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