Circuit Note
CN-0025
Devices Connected/Referenced
Circuit Designs Using Analog Devices Products
Apply these product pairings quickly and with confidence.
For more information and/or support call 1-800-AnalogD
(1-800-262-5643) or visit www.analog.com/circuit.
AD5546
16-Bit Multiplying DAC
AD5556
14-Bit Multiplying DAC
AD8610
Precision Amplifier
Precision, AC Reference Signal Attenuator Using the
AD5546/AD5556 Multiplying DAC
CIRCUIT FUNCTION AND BENEFITS
a single 2.7 V to 5.5 V supply with ±10 V multiplying references
for 4-quadrant outputs. Multiplying bandwidth is 4 MHz. Built
in 4-quadrant resistors facilitate resistance matching and
temperature tracking that minimize the number of components
needed for multiquadrant applications. Besides handling digital
waveforms decoded from parallel input data, the AD5546/
AD5556 handle low frequency ac reference signals for signal
attenuation, channel equalization, and waveform generation
applications.
This circuit provides precision, ac signal attenuation using the
AD5546/AD5556 DAC and the AD8610 precision operational
amplifier. This circuit provides accurate, low noise, high speed
output voltage capability and is well suited for process control,
automatic test equipment, and digital calibration applications.
CIRCUIT DESCRIPTION
The AD5546/AD5556 are precision 16-/14-bit, multiplying, low
power, current output, parallel input DACs. They operate from
+10V
VIN
–10V
R1
RCOM
R1
+5V
REF
R2
ROFS
ROFS
RFB
C8
2.2pF
+12V
C4
0.1µF
RFB
VDD
C2
0.1µF
IOUT
16/14-BIT
U1
AD5546/AD5556
–
C5
1µF
V+
U2
AD8610
GND
+
VOUT
V–
16/14 DATA
C6
0.1µF
WR LDAC RS
MSB
WR
LDAC
RS
MSB
C7
1µF
–12V
08344-001
C1
1µF
Figure 1. AC Signal Attenuation Configuration Using the AD5546/56 Precision DAC and the AD8610 Precision Op Amp (Simplified Schematic)
Rev. 0
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each circuit, and their function and performance have been tested and verified in a lab environment
at room temperature. However, you are solely responsible for testing the circuit and determining its
suitability and applicability for your use and application. Accordingly, in no event shall Analog
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©2009 Analog Devices, Inc. All rights reserved.
CN-0025
Circuit Note
An op amp is used in the current-to-voltage (I-V) stage of this
circuit. An op amp’s bias current and offset voltage are both
important selection criteria for use with precision current
output DACs. Therefore, this circuit employs the AD8610
op amp, which has ultralow offset voltage (100 µV maximum
for B grade) and bias current (10 pA maximum). The value of
C8 for this circuit is 2.2 pF, which is optimized to compensate
for the external output capacitance of the DAC.
LEARN MORE
ADIsimPower Design Tool. Analog Devices.
Kester, Walt. The Data Conversion Handbook. Chapters 3 and 7.
Analog Devices. 2005.
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.
Data Sheets
AD5546 Data Sheet.
AD5556 Data Sheet.
AD8610 Data Sheet.
REVISION HISTORY
6/09—Revision 0: Initial Version
(Continued from first page) "Circuits from the Lab" are intended only for use with Analog Devices products and are the intellectual property of Analog Devices or its licensors. While you may
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©2009Analog Devices, Inc. All rights reserved. Trademarks and
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