AN-1247
APPLICATION NOTE
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Software Configurable 14-Bit Quad Channel
Unipolar/Bipolar Voltage Output Using the AD5734 DAC
CIRCUIT FUNCTION AND BENEFITS
+15V
REF192
GND
Description
Complete quad, 14-bit, serial input,
unipolar/bipolar voltage output DAC
Precision 2.5 V voltage reference
+15V
10μF
+
+
+5V
0.1μF
0.1μF
CONTROLLER
Table 1. Devices Connected/Referenced
DVCC
REFIN
SCLK
SYNC
SDO
AD5734
LDAC
10μF
0.1μF
AVDD
VOUTA
VOUTA
VOUTB
VOUTB
VOUTC
VOUTC
VOUTD
VOUTD
CLR
BIN/2sCOMP
+5V
The circuit must be constructed on a multilayer PC board with
a large area ground plane. Proper layout, grounding, and
decoupling techniques must be used to achieve optimum
performance (see MT-031 Tutorial and MT-101 Tutorial).
Rev. A | Page 1 of 2
GND
DAC_GND (2)
SIG_GND (2)
AVSS
A
+
B
10μF
08330-001
0.1μF
–15V
Figure 1. Unipolar/Bipolar Configuration of the AD5734 DAC
(Simplified Schematic)
0.07
TA = 25°C
0.06
0.05
0V TO +5V
0.04
0.03
0V TO +10V
0.02
–5V TO +5V
0.01
0
–10V TO +10V
–0.01
–0.02
08330-002
The AD5734 is a digital-to-analog converter that offers guaranteed
14-bit monotonicity, integral nonlinearity (INL) of ±4 LSB, 0.1%
total unadjusted error (TUE), and 10 μs settling time. The AD5734
also integrates reference buffers and output amplifiers, which leads
to additional 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 if only unipolar outputs
are required. The output range can be individually programmed for
each output channel. The options are 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.
VOLTAGE OUTPUT ERROR (%FSR)
REF192
VS OUTPUT
0.1μF
SDIN
CIRCUIT DESCRIPTION
Product
AD5734
10μF
+
This circuit provides, unipolar and bipolar data conversion using
the AD5734BREZ, a quad, 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.
0
5000
10,000
DAC CODE
Figure 2. Output Voltage Error
15,000
AN-1247
Application Note
LEARN MORE
REVISION HISTORY
Kester, Walt. 2005. The Data Conversion Handbook, Chapter 3
and Chapter7. Analog Devices.
5/13—Rev. 0 to Rev. A
MT-015 Tutorial, Basic DAC Architectures II: Binary DACs.
Analog Devices.
Changed Document Title from CN-0087 to
AN-1247 .............................................................................. Universal
7/09—Revision 0: Initial Version
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
AD5734 Data Sheet.
REF192 Data Sheet.
AD5754R Evaluation Board (Compatible with AD5734).
©2009–2013 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
AN08330-0-5/13(A)
Rev. A | Page 2 of 2