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AD5114 Datasheet(PDF) 21 Page - Analog Devices

Part No. AD5114
Description  Single-Channel, 128-/64-/32-Position, Up/Down, ±8% Resistor Tolerance, Nonvolatile Digital Potentiometer
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD5114 Datasheet(HTML) 21 Page - Analog Devices

 
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Data Sheet
AD5111/AD5113/AD5115
Rev. 0 | Page 21 of 24
POWER-UP SEQUENCE
Because of the ESD protection diodes that limit the voltage
compliance at the A, B, and W terminals (see Figure 45), it is
important to power on VDD before applying any voltage to the
A, B, and W terminals. Otherwise, the diodes are forward-
biased such that VDD is powered on unintentionally and can
affect other parts of the circuit. Similarly, VDD should be
powered down last. The ideal power-on sequence is in the
following order: GND, VDD, and VA/VB/VW. The order of
powering VA, VB, VW and the digital inputs is not important as
long as they are powered on after VDD.
GND
VDD
A
W
B
Figure 45. Maximum Terminal Voltages Set by VDD and GND
LAYOUT AND POWER SUPPLY BIASING
It is always a good practice to use compact, minimum lead
length layout design. The leads to the input should be as direct
as possible with a minimum conductor length. Ground paths
should have low resistance and low inductance. It is also good
practice to bypass the power supplies with quality capacitors.
Apply low equivalent series resistance (ESR) 1 μF to 10 μF
tantalum or electrolytic capacitors at the supplies to minimize
any transient disturbance and to filter low frequency ripple.
Figure 46 illustrates the basic supply bypassing configuration
for the AD5111/AD5113/AD5115.
VDD
VDD
+
GND
C1
0.1µF
C2
10µF
AGND
AD5111/
AD5113/
AD5115
Figure 46. Power Supply Bypassing


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