AN-1200
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 AD5732 DAC
CIRCUIT FUNCTION AND BENEFITS
CIRCUIT DESCRIPTION
This circuit provides unipolar and bipolar data conversion using
the AD5732BREZ, a dual, 14-bit, serial input, unipolar/bipolar
voltage output DAC and the REF192ESZ precision 2.5 V voltage
reference. The only other external components needed for this
14-bit DAC circuit 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.
Table 1. Devices Connected/Referenced
Product
AD5732
Description
Complete, dual, 14-bit, unipolar/bipolar voltage
output DAC
Precision 2.5 V voltage reference
REF192
The AD5732 is a digital-to-analog converter (DAC) that offers
guaranteed 14-bit monotonicity, integral nonlinearity (INL) of
±4 LSB, 0.1% total unadjusted error (TUE), and 10 µs settling
time. The AD5732 also integrates reference buffers and output
amplifiers, which 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.
AVSS supply range from −4.5 V to −16.5 V. AVSS can be
connected to 0 V if only unipolar outputs are required.
+15V
+
10μF
0.1μF
VIN VOUT
REF192
GND
+15V
10μF
+
+
+5V
0.1μF
0.1μF
DVCC
REFIN
10μF
0.1μF
AVDD
CONTROLLER
SDIN
SCLK
SYNC
SDO
VOUTA
VOUTA
VOUTB
VOUTB
AD5732
LDAC
CLR
BIN/2sCOMP
GND
DAC_GND (2)
SIG_GND (2)
AVSS
+
A
B
10μF
0.1μF
–15V
08337-001
+5V
Figure 1. Unipolar/Bipolar Configuration for the AD5732 DAC (Simplified Schematic)
Rev. A | Page 1 of 2
AN-1200
Application Note
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 0.06 %FSR.
LEARN MORE
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).
MT-101 Tutorial, Decoupling Techniques. Analog Devices.
0.07
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.
Voltage Reference Wizard Design Tool.
Data Sheets and Evaluation Boards
AD5732 Data Sheet.
REF192 Data Sheet.
AD5754R Evaluation Board (Compatible with AD5732).
TA = 25°C
0.06
REVISION HISTORY
0.05
4/13—Rev. 0 to Rev. A
Document Title Changed from CN-0093 to AN-1200 ....... Universal
0V TO +5V
0.04
0.03
0V TO +10V
7/09—Revision 0: Initial Version
0.02
–5V TO +5V
0.01
0
–10V TO +10V
08337-002
VOLTAGE OUTPUT ERROR (%FSR)
Kester, Walt. 2005. The Data Conversion Handbook. Analog
Devices. Chapters 3 and 7.
–0.01
–0.02
0
5000
10,000
15,000
DAC CODE
Figure 2. Voltage Output Error
©2009–2013 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D08337-0-4/13(A)
Rev. A | Page 2 of 2