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AD5122 Datasheet(PDF) 17 Page - Analog Devices

Part No. AD5122
Description  Dual Channel, 128-/256-Position, SPI, Nonvolatile Digital Potentiometer
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD5122 Datasheet(HTML) 17 Page - Analog Devices

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Data Sheet
AD5122/AD5142
Rev. C | Page 17 of 32
–80
–90
–70
–60
–50
–40
–30
–20
–10
0
10
10
100
1k
10k
100k
1M
FREQUENCY (Hz)
QUARTER SCALE
MIDSCALE
FULL-SCALE
VDD/VSS = ±2.5V
RAB = 100kΩ
Figure 26. Normalized Phase Flatness vs. Frequency, RAB = 100 kΩ
0
100
200
300
400
500
600
0
1
2
3
4
5
VOLTAGE (V)
100kΩ, VDD = 2.3V
100kΩ, VDD = 2.7V
100kΩ, VDD = 3V
100kΩ, VDD = 3.6V
100kΩ, VDD = 5V
100kΩ, VDD = 5.5V
10kΩ, VDD = 2.3V
10kΩ, VDD = 2.7V
10kΩ, VDD = 3V
10kΩ, VDD = 3.6V
10kΩ, VDD = 5V
10kΩ, VDD = 5.5V
Figure 27. Incremental Wiper On Resistance vs. Positive Power Supply (VDD)
0
1
2
3
4
5
6
7
8
9
10
0
20
40
60
80
100
120
0
10
20
30
40
50
60
CODE (Decimal)
AD5142
AD5122
10k
Ω + 0pF
10k
Ω + 75pF
10k
Ω + 150pF
10k
Ω + 250pF
100k
Ω + 0pF
100k
Ω + 75pF
100k
Ω + 150pF
100k
Ω + 250pF
Figure 28. Maximum Bandwidth vs. Code vs. Net Capacitance
–0.1
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0
5
10
15
TIME (µs)
0x80 TO 0x7F 100kΩ
0x80 TO 0x7F 10kΩ
Figure 29. Maximum Transition Glitch
0
0.2
0.4
0.6
0.8
1.0
1.2
0
0.0005
0.0010
0.0015
0.0020
0.0025
–400
–500
–600
–300 –200 –100
0
100
200
300
400
500
600
RESISTOR DRIFT (ppm)
Figure 30. Resistor Lifetime Drift
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
VDD = 5V ±10% AC
VSS = GND, VA = 4V, VB = GND
CODE = MIDSCALE
10kΩ, RDAC1
100kΩ, RDAC1
Figure 31. Power Supply Rejection Ratio (PSRR) vs. Frequency


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