AD5292 Analog Devices, AD5292 Datasheet - Page 23

• Manufacturer Part Number: AD5292
• Description: (AD5291 / AD5292) Digital Potentiometer
• Manufacturer: Analog Devices

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TERMINAL VOLTAGE OPERATING RANGE
The positive V
AD5291/AD5292 define the boundary conditions for proper
3-terminal digital potentiometer operation. Supply signals
present on Terminal A, Terminal B, and Terminal W that
exceed V
diodes (see Figure 48).
The ground pin of the AD5291/AD5292 device is primarily
used as a digital ground reference. To minimize the digital
ground bounce, the AD5291/AD5292 ground terminal should
be joined remotely to the common ground. The digital input
Figure 48. Maximum Terminal Voltages Set by V
DD
or V
DD
SS
and negative V
are clamped by the internal forward-biased
SS
power supplies of the
DD
V
A
W
B
V
DD
SS
and V
SS
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control signals to the AD5291/AD5292 must be referenced to
the device ground pin (GND), and satisfy the logic level defined
in the Specifications section.
Power-Up Sequence
To ensure that the AD5291/AD5292 power up correctly, a 1 μF
capacitor must be connected to the EXT_CAP pin. Because
there are diodes to limit the voltage compliance at Terminal A,
Terminal B, and Terminal W (see Figure 48), it is important to
power V
Terminal B, and Terminal W. Otherwise, the diode is forward-
biased such that V
The ideal power-up sequence is GND, V
digital inputs, and then V
up V
they are powered after V
Regardless of the power-up sequence and the ramp rates of the
power supplies, after V
activates, restoring the 20-TP memory value to the RDAC
register.
A
, V
DD
B
, V
and V
W
, and the digital inputs is not important as long as
SS
DD
first before applying any voltage to Terminal A,
and V
LOGIC
DD
A
, V
, V
SS
is powered, the power-on preset
are powered up unintentionally.
B
SS
, and V
, and V
W
LOGIC
AD5291/AD5292
. The order of powering
SS
, V
.
LOGIC
and V
DD
, the