AN-1195
APPLICATION NOTE
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Software Configurable 12-Bit Quad-Channel Unipolar/Bipolar Voltage Output Using
the AD5724 DAC
CIRCUIT FUNCTION AND BENEFITS
CIRCUIT DESCRIPTION
This circuit provides unipolar and bipolar data conversion using
the AD5724BREZ, a quad, 12-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
12-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
AD5724
Description
Complete, quad, 12-bit, serial input, unipolar/bipolar
voltage output DAC
Precision 2.5 V voltage reference
REF192
The AD5724 is a digital-to-analog converter (DAC) that offers
guaranteed 12-bit monotonicity, integral nonlinearity (INL) of
±1 LSB, 0.1% total unadjusted error (TUE), and 10 µs settling
time. The AD5724 also integrates 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.
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
VOUTC
VOUTC
VOUTD
VOUTD
AD5724
LDAC
CLR
GND
DAC_GND (2)
SIG_GND (2)
AVSS
+
A
B
10μF
0.1μF
–15V
08331-001
BIN/2sCOMP
+5V
Figure 1. Unipolar/Bipolar Configuration for the AD5724 DAC (Simplified Schematic)
Rev. A | Page 1 of 2
AN-1195
Application Note
The output range can be individually programmed for each of
the four outputs 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
AD5724 Data Sheet.
REF192 Data Sheet.
AD5754R Evaluation Board (Compatible with AD5724).
TA = 25°C
0.06
REVISION HISTORY
0.05
4/13—Rev. 0 to Rev. A
0V TO +5V
0.04
Document Title Changed from CN-0088 to AN-1195 ....... Universal
0.03
0V TO +10V
7/09—Revision 0: Initial Version
0.02
–5V TO +5V
0.01
0
–10V TO +10V
08331-002
VOLTAGE OUTPUT ERROR (%FSR)
Kester, Walt. 2005. The Data Conversion Handbook. Analog
Devices. Chapters 3 and 7.
–0.01
–0.02
0
1000
2000
3000
4000
DAC CODE
Figure 2. Voltage Output Error
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D08331-0-4/13(A)
Rev. A | Page 2 of 2