AD5112 AD [Analog Devices], AD5112 Datasheet - Page 21

• Manufacturer Part Number: AD5112
• Manufacturer: AD [Analog Devices]

Data Sheet
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 V
A, B, and W terminals. Otherwise, the diodes are forward-
biased such that V
affect other parts of the circuit. Similarly, V
powered down last. The ideal power-on sequence is in the
following order: GND, V
powering V
long as they are powered on after V
Figure 45. Maximum Terminal Voltages Set by V
A
, V
B
, V
DD
W
is powered on unintentionally and can
and the digital inputs is not important as
DD
DD
, and V
before applying any voltage to the
A
/V
DD
.
B
/V
W
. The order of
V
W
GND
DD
A
B
DD
should be
DD
and GND
Rev. 0 | Page 21 of 24
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.
V
DD
Figure 46. Power Supply Bypassing
+
C2
10µF
AD5111/AD5113/AD5115
C1
0.1µF
V
AD5111/
AD5113/
AD5115
DD
GND
AGND