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AD5293 Datasheet(PDF) 18 Page - Analog Devices

Part # AD5293
Description  Single-Channel, 1024-Position, 1% R-Tolerance Digital Potentiometer
PDF  20 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD5293 Datasheet(HTML) 18 Page - Analog Devices

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AD5293
Rev. 0 | Page 18 of 20
APPLICATIONS INFORMATION
HIGH VOLTAGE DAC
The AD5293 can be configured as a high voltage DAC, with output
voltage as high as 33 V. The circuit is shown in Figure 38. The
output is
⎥
⎥
⎦
⎤
⎢
⎢
⎣
⎡
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
+
×
×
=
1
2
OUT
R
R
D
D
V
1
V
2
.
1
1024
)
(
(4)
where D is the decimal code from 0 to 1023.
AD5293
U2
AD8512
V+
V–
AD8512
VOUT
VDD
U1B
VDD
RBIAS
ADR512
D1
R2
R1
B
20kΩ
U1A
Figure 38. High Voltage DAC
PROGRAMMABLE VOLTAGE SOURCE WITH
BOOSTED OUTPUT
For applications that require high current adjustments, such as
a laser diode or tunable laser, a boosted voltage source can be
considered (see Figure 39).
W
SIGNAL
CC
RBIAS
LD
VIN
A
B
VOUT
U1
AD5293
U3 2N7002
U2
IL
OP184
Figure 39. Programmable Boosted Voltage Source
In this circuit, the inverting input of the op amp forces VOUT to
be equal to the wiper voltage set by the digital potentiometer.
The load current is then delivered by the supply via the N-channel
FET (U3). The N-channel FET power handling must be adequate
to dissipate (VIN − VOUT) × IL power. This circuit can source a
maximum of 100 mA with a 33 V supply.
HIGH ACCURACY DAC
It is possible to configure the AD5293 as a high accuracy DAC
by optimizing the resolution of the device over a specific reduced
voltage range. This is achieved by placing external resistors on
either side of the RDAC, as shown in Figure 40. The improved
±1% resistor tolerance specification greatly reduces errors that
are associated with matching to discrete resistors.
3
AB
D
1
DD
AB
D
3
OUT
R
R
R
V
R
R
D
V
+
×
+
×
×
+
=
−
)
(
)
(
)
(
1024
)
1024
(
1024
(5)
AD5293
U1
VOUT
B
R2
20kΩ
R1
R3
±1%
OP1177
V+
V–
VDD
VDD
U2
Figure 40. Optimizing Resolution
VARIABLE GAIN INSTRUMENTATION AMPLIFIER
The AD8221 in conjunction with the AD5293 and the
ADG1207, as shown in Figure 41, make an excellent
instrumentation amplifier for use in data acquisition systems.
The data acquisition system is low distortion and low noise
enable it to condition signals in front of a variety of ADCs.
AD8221
AD5293
+VIN1
VDD
VOUT
VSS
ADG1207
+VIN4
–VIN1
–VIN4
Figure 41. Data Acquisition System
The gain can be calculated by using Equation 6, as follows:
AB
R
D
D
G
×
+
=
)
1024
(
kΩ
4
.
49
1
)
(
(6)



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