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AD5122 Datasheet(PDF) 16 Page - Analog Devices

Part No. AD5122
Description  Dual Channel, 128-/256-Position, SPI, Nonvolatile Digital Potentiometer
Download  32 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD5122 Datasheet(HTML) 16 Page - Analog Devices

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AD5122/AD5142
Data Sheet
Rev. C | Page 16 of 32
0
0.2
0.4
0.6
0.8
1.0
1.2
0
1
2
3
4
5
INPUT VOLTAGE (V)
VLOGIC = 1.8V
VLOGIC = 2.3V
VLOGIC = 3.3V
VLOGIC = 5V
VLOGIC = 5.5V
Figure 20. ILOGIC Current vs. Digital Input Voltage
–60
–50
–40
–30
–20
–10
0
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
AD5142 (AD5122)
0x80 (0x40)
0x40 (0x20)
0x20 (0x10)
0x10 (0x08)
0x8 (0x04)
0x4 (0x02)
0x2 (0x01)
0x1 (0x00)
0x00
Figure 21. 10 kΩ Gain vs. Frequency vs. Code
–100
–90
–80
–70
–60
–50
–40
20
200
2k
20k
200k
FREQUENCY (Hz)
10k
100k
VDD/VSS = ±2.5V
VA = 1V rms
VB = GND
CODE = HALF SCALE
NOISE FILTER = 22kHz
Figure 22. Total Harmonic Distortion Plus Noise (THD + N) vs. Frequency
–100
–80
–60
–40
–20
0
20
10
100
1k
10k
100k
1M
10M
FREQUENCY (Hz)
QUARTER SCALE
MIDSCALE
FULL-SCALE
VDD/VSS = ±2.5V
RAB = 10kΩ
Figure 23. Normalized Phase Flatness vs. Frequency, RAB = 10 kΩ
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
10
FREQUENCY (Hz)
10
100
1k
10k
100k
1M
10M
0x80 (0x40)
0x40 (0x20)
0x20 (0x10)
0x10 (0x08)
0x8 (0x04)
0x4 (0x02)
0x2 (0x01)
0x1 (0x00)
0x00
AD5142 (AD5122)
Figure 24. 100 kΩ Gain vs. Frequency vs. Code
10k
100k
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
0.001
0.01
0.1
1
VOLTAGE (V rms)
VDD/VSS = ±2.5V
fIN = 1kHz
CODE = HALF SCALE
NOISE FILTER = 22kHz
Figure 25. Total Harmonic Distortion Plus Noise (THD + N) vs. Amplitude


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