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
16-Bit PCM Audio DAC
AD1856
FUNCTIONAL BLOCK DIAGRAM
R
F
16-BIT
I
OUT
DAC
AUDIO
OUTPUT
16-BIT INPUT LATCH
REFERENCE
Compact disc players
Digital audio amplifiers
DAT recorders and players
Synthesizers and keyboards
CLK
LE
DATA
Figure 1.
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.
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, +V
L
and −V
L
, can be separated from the
analog supplies, +V
S
and −V
S
, 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.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Total harmonic distortion is 100% tested.
MSB trim feature allows superlinear operation.
The
AD1856
operates with ±5 V to ±12 V supplies.
Serial interface is compatible with digital filter chips.
1.5 μs settling time permits 2×, 4×, and 8× oversampling.
No external components are required.
96 dB dynamic range.
±3 V or ±8 mA output capability.
16-bit resolution.
Twos complement serial input words.
Low cost.
16-lead plastic SOIC package.
Rev. C
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00759-001
APPLICATIONS
16-BIT SERIAL-TO-PARALLEL
CONVERSION
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
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× f
S
Oversampling with Two AD1856 Devices
and the Yamaha YM3414 .......................................................... 14
Outline Dimensions ....................................................................... 15
Ordering Guide .......................................................................... 15
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
Changes to Table 2.............................................................................5
Changes to Figure 2 and Table 3......................................................6
Deleted Figure 14 and Dual DAC, 4× f
S
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
Data Sheet
SPECIFICATIONS
Typical values at T
A
= 25°C, V
L
= ±5 V, and V
S
= ±5 V, unless otherwise noted.
Table 1.
Parameter
RESOLUTION
1
DIGITAL INPUTS
Input Voltage High, V
IH
Input Voltage Low, V
IL
Input Current High, I
IH1
Input Current Low, I
IL1
Clock Input Frequency
1
ACCURACY
Gain Error
Bipolar Zero Error
Differential Linearity Error
Noise at Bipolar Zero
TOTAL HARMONIC DISTORTION
0 dB
−20 dB
−60 dB
MONOTONICITY
DRIFT
Total Drift
Bipolar Zero Drift
SETTLING TIME
Voltage Output
Slew Rate
Current Output
WARM-UP TIME
OUTPUT
Voltage Output Configuration
Bipolar Range
Output Current
Output Impedance
Short-Circuit Duration
Current Output Configuration
Bipolar Range (±30%)
Output Impedance (±30%)
POWER SUPPLY
Voltage, +V
L
and +V
S
Voltage, −V
L
and −V
S
Current, +I
Current, −I
Test Conditions/Comments
Min
Typ
Max
16
+V
L
1.0
−10
10
±2.0
±30
±0.001
6
0.002
0.002
0.018
0.018
1.8
1.8
15
±25
±4
To ±0.006% of FSR
6 V step
1 LSB step
1 mA step, 10 Ω to 100 Ω load
1 kΩ load
1
1.5
1.0
9
350
350
0.0025
1
0.008
1
0.020
1
0.040
1
2.0
1
4.0
1
AD1856
Unit
Bits
V
V
µA
µA
MHz
%
mV
% of FSR
µV
%
%
%
%
%
%
Bits
ppm of FSR/°C
ppm of FSR/°C
µs
µs
V/µs
ns
ns
Minute
0
V
IH
= +V
L
V
IL
= 0.4 V
2.4
0.8
RMS, 20 Hz to 20 kHz
990.5 Hz
AD1856RZ-K
AD1856RZ
AD1856RZ-K
AD1856RZ
AD1856RZ-K
AD1856RZ
0°C to 70°C
±3
±8
0.1
Indefinite to ground
±1.0
1.7
+V
S
≥ +V
L
for operation
−V
L
≥ −V
S
for operation
+V
L
and +V
S
= 5 V, 10 MHz clock
+V
L
and +V
S
= 12 V, 10 MHz clock
−V
L
and −V
S
= −5 V, 10 MHz clock
−V
L
and −V
S
= −12 V, 10 MHz clock
4.75
−13.2
5
−5
10
12
−12
−15
13.2
−4.75
15
1
−15
1
V
mA
Ω
mA
kΩ
V
V
mA
mA
mA
mA
Rev. C | Page 3 of 16
AD1856
Parameter
POWER DISSIPATION
Test Conditions/Comments
10 MHz clock
±V
S
and ±V
L
= ±5 V
±V
S
and ±V
L
= ±12 V
Min
Typ
110
135
0
−25
−60
Max
150
1
Data Sheet
Unit
mW
mW
°C
°C
°C
TEMPERATURE RANGE
Specification
Operational
Storage
1
+70
+70
+100
Tested on all production units at final test.
Rev. C | Page 4 of 16
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
+V
L
to DGND
+V
S
to AGND
−V
L
to DGND
−V
S
to AGND
Digital Inputs to DGND
AGND to DGND
Short-Circuit Protection
Soldering, 10 sec
Storage Temperature Range
Rating
0 V to 13.2 V
0 V to 13.2 V
−13.2 V to 0 V
−13.2 V to 0 V
−0.3 V to +V
L
±0.3 V
Indefinite short to ground
300°C
−60°C to +100°C
AD1856
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
ESD CAUTION
Rev. C | Page 5 of 16
