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AD5121 Datasheet(PDF) 19 Page - Analog Devices

Part # AD5121
Description  Single Channel, 128-/256-Position, I2C/SPI, Nonvolatile Digital Potentiometer
PDF  32 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD5121 Datasheet(HTML) 19 Page - Analog Devices

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Data Sheet
AD5121/AD5141
Rev. 0 | Page 19 of 32
TEST CIRCUITS
Figure 34 to Figure 38 define the test conditions used in the Specifications section.
A
W
B
NC
IW
DUT
VMS
NC = NO CONNECT
Figure 34. Resistor Integral Nonlinearity Error (Rheostat Operation; R-INL, R-DNL)
A
W
B
DUT
VMS
V+
V+ = VDD
1LSB = V+/2N
Figure 35. Potentiometer Divider Nonlinearity Error (INL, DNL)
A
W
NC
B
DUT
IW = VDD/RNOMINAL
VMS1
VW
RW = VMS1/IW
NC = NO CONNECT
Figure 36. Wiper Resistance
A
W
B
VMS
V+ = VDD ±10%
PSRR (dB) = 20 LOG
VMS
ΔVDD
(
)
~
VA
VDD
ΔVMS%
ΔVDD%
PSS (%/%) =
V+
Δ
Figure 37. Power Supply Sensitivity and
Power Supply Rejection Ratio (PSS and PSRR)
+
–
DUT
CODE = 0x00
0.1V
VSS TO VDD
RSW =
0.1V
ISW
ISW
W
B
A = NC
Figure 38. Incremental on Resistance



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