AD5732RBREZ-REEL7

AN-1197
APPLICATION NOTE
One Technology Way P. O. Box 9106 Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 www.analog.com
Software Configurable 14-Bit Dual-Channel Unipolar/Bipolar
Voltage Output Using the AD5732R DAC
Rev. A | Page 1 of 2
CIRCUIT FUNCTION AND BENEFITS
This circuit provides unipolar and bipolar data conversion using
the AD5732R, a dual, 14-bit, serial input, unipolar/bipolar voltage
output DAC. The only external components needed for this
14-bit DAC are decoupling capacitors on the supply pins and
reference input, leading to savings in cost and board space. This
circuit is well suited for closed-loop servo control applications.
CIRCUIT DESCRIPTION
The AD5732R is a digital-to-analog converter that offers guar-
anteed 14-bit monotonicity, integral nonlinearity (INL) of ±4 LSB,
0.1% total unadjusted error (TUE), and 10 μs settling time. The
AD5732R also integrates a 2.5 V, 5 ppm/°C voltage reference,
reference buffers, and output amplifiers. This leads to further
savings in both cost and board space. Performance is guaranteed
over the following supply voltage ranges: AVDD supply range
from +4.5 V to +16.5 V, and AVSS supply range from −4.5 V to
−16.5 V. AVSS can be connected to 0 V only if unipolar outputs
are required. The output range can be individually programmed
for each output channel with these options: 0 V to +5 V, 0 V to
+10 V, 0 V to +10.8 V, −5 V to +5 V, −10 V to +10 V, and −10.8 V to
+10.8 V. The input coding is user selectable twos complement
or offset binary for a bipolar output (depending on the state of
the BIN/
2sCOMP
pin). Coding is straight binary for a unipolar
output. Figure 2 shows that the typical output error of this circuit
at 25°C ambient temperature is less than 0.07 %FSR.
The circuit must be constructed on a multilayer printed circuit
board (PCB) with a large area ground plane. Proper layout,
grounding, and decoupling techniques must be used to achieve
optimum performance (see MT-031 Tutorial, Grounding Data
Converters and Solving the Mystery of AGND and DGND and
MT-101 Tutorial, Decoupling Techniques).
+
AV
SS
–15V
SIG_GND (2)
DAC_GND (2)
GND
SDIN
SCLK
SYNC
+5V
A
B
CONTROLLER
SDO
LDAC
CLR
BIN/2sCOMP
10μF
0.1μF
10μF
0.1μF
10μF
0.1μF
V
OUT
A
V
OUT
A
V
OUT
B
V
OUT
B
+
AV
DD
+15V
+
DV
CC
REFIN/REFOUT
0.1μF
AD5732R
+5V
08334-001
Figure 1. Unipolar/Bipolar Configuration for the
AD5732R DAC (Simplified Schematic)
–0.04
0.08
0 5000 10,000 15,000
08334-002
DAC CODE
VOLTAGE OUTPUT ERROR (%FSR)
T
A
= 25°C
0V TO +10V
–10V TO +10V
–5V TO +5V
0.06
0.04
0.02
0
–0.02
0V TO +5V
Figure 2. Output Voltage Error
AN-1197 Application Note
Rev. A | Page 2 of 2
LEARN MORE
Kester, Walt. 2005. The Data Conversion Handbook. Analog
Devices. Chapters 3 and 7.
MT-015 Tutorial, Basic DAC Architectures II: Binary DACs.
Analog Devices.
MT-031 Tutorial, Grounding Data Converters and Solving the
Mystery of AGND and DGND. Analog Devices.
MT-101 Tutorial, Decoupling Techniques. Analog Devices.
Voltage Reference Wizard Design Tool.
Data Sheets and Evaluation Boards
AD5732R Data Sheet.
AD5754R Evaluation Board (Compatible with AD5732R).
REVISION HISTORY
6/13Rev. 0 to Rev. A
Changed Document Title from CN0090 to
AN-1197 .............................................................................. Universal
7/09Revision 0: Initial Version
©20092013 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
AN08334-0-6/13(A)

AD5732RBREZ-REEL7

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Digital to Analog Converters - DAC IC Dual 14Bit VTG Output
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