AD5293BRUZ-20 Analog Devices Inc, AD5293BRUZ-20 Datasheet - Page 22

• Manufacturer Part Number: AD5293BRUZ-20
• Description: IC DGTL POT 1024POS 20K 14TSSOP
• Manufacturer: Analog Devices Inc

Specifications of AD5293BRUZ-20

• Temperature Coefficient: 35 ppm/°C Typical
• Taps: 1024
• Resistance (ohms): 20K
• Number Of Circuits: 1
• Interface: SPI Serial
• Voltage - Supply: 9 V ~ 33 V, ±9 V ~ 16.5 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 14-TSSOP
• Resistance In Ohms: 20K
• End To End Resistance: 20kohm
• Track Taper: Linear
• No. Of Steps: 256
• Resistance Tolerance: ± 1%
• Control Interface: Serial, SPI
• No. Of Pots: Single
• Potentiometer Ic: RoHS Compliant
• Supply Voltage Range: ± 9V To ± 16.5V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Type: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AD5293BRUZ-20-U1; AD5293BRUZ-20-U1

AD5293
APPLICATIONS INFORMATION
HIGH VOLTAGE DAC
The AD5293 can be configured as a high voltage DAC, with an
output voltage as high as 33 V. The circuit is shown in Figure 51.
The output is
where D is the decimal code from 0 to 1023.
ADR512
PROGRAMMABLE VOLTAGE SOURCE WITH
BOOSTED OUTPUT
For applications that require high current adjustments, such as
a laser diode or turnable laser, a boosted voltage source can be
considered (see Figure 52).
In this circuit, the inverting input of the op amp forces V
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 (V
maximum of 100 mA with a 33 V supply.
R
BIAS
V
OUT
V
AD5293
DD
(
D1
D
U1
Figure 52. Programmable Boosted Voltage Source
)
R
1
=
V
IN
IN
1024
B
A
− V
D
AD8512
V–
W
V+
×
Figure 51. High Voltage DAC
OUT
V
R
OP184
⎡
⎢
⎢
⎣
DD
2
1
U1A
) × I
2 .
V
U2
L
×
U3 2N7002
power. This circuit can source a
⎛
⎜
⎜
⎝
1
U2
+
AD5293
R
B
R
2
1
20kΩ
⎞
⎟
⎟
⎠
⎤
⎥
⎥
⎦
SIGNAL
LD
C
C
U1B
AD8512
R
V
BIAS
OUT
I
L
OUT
V
OUT
Rev. D | Page 22 of 24
to
(4)
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 53. The improved
±1% resistor tolerance specification greatly reduces error
associated with matching to discrete resistors.
VARIABLE GAIN INSTRUMENTATION AMPLIFIER
The
as shown in Figure 54, 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.
The gain can be calculated by using Equation 6, as follows:
AD8221
V
G
+V
+V
–V
–V
OUT
(
IN1
IN4
IN1
IN4
D
)
(
=
D
1
)
in conjunction with the AD5293 and the ADG1207,
+
ADG1207
=
U1
AD5293
(
R
D
1
20kΩ
Figure 54. Data Acquisition System
R
1024
+
Figure 53. Optimizing Resolution
49
3
R
R
R
1
2
3
+
(
B
4 .
V
(
DD
1024
(
)
kΩ
D
±1%
×
1024
−
R
D
AB
)
×
1024
AD5293
R
AB
)
×
OP1177
)
R
U2
V+
V–
×
AB
V
V
DD
DD
+
R
3
AD8221
V
V
DD
SS
V
OUT
V
OUT
(5)
(6)