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AD5235 Datasheet(PDF) 8 Page - Analog Devices

Part No. AD5235
Description  Nonvolatile Memory, Dual 1024 Position Digital Potentiometers
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD5235 Datasheet(HTML) 8 Page - Analog Devices

 
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PRELIMINARY TECHNICAL DATA
Nonvolatile Memory Digital Potentiometers
AD5235
REV PrD 6 NOV, 2000
8
Information contained in this Product Concept data sheet describes a product in the early definition stage. There is no guarantee that the
information contained here will become a final product in its present form. For latest information contact Walt Heinzer/Analog Devices, Santa Clara,
CA. TEL(408)562-7254; FAX (408)727-1550; walt.heinzer@analog.com
RWA(Dx) = [ (2
N-Dx)/2N ] * R
AB + RW
eqn. 3
Similarly, eqn. 3 becomes:
RWA(Dx) = [ (1024-Dx)/1024 ] * RAB + 50Ω
eqn. 4
For example, when VA = 0V and B–terminal is tied to the wiper W
the following output resistance values will be set for the following
RDAC latch codes (applies to RAB=10KΩ potentiometers):
Dx
RWA
Output State
(DEC)
(
Ω)
1023
74
Full-Scale
512
12500
Mid-Scale
1
25000
1 LSB
0
25050
Zero-Scale
A ±1% typical distribution of RAB from channel-to-channel occurs
within the same package. On the other hand, device to device
matching is process lot dependent such that a maximum of ±30%
variation is possible. The change in RAB with temperature has a 50
ppm/°C temperature coefficient.
PROGRAMMING THE POTENTIOMETER DIVIDER
Voltage Output Operation
The digital potentiometer easily generates an output voltage
proportional to the input voltage applied to a given terminal. For
example connecting A–terminal to +5V and B–terminal to ground
produces an output voltage at the wiper which can be any value
starting at zero volts and up to 1 LSB less than +5V. Each LSB of
voltage is equal to the voltage applied across terminal AB divided
by the 2
N resolution of the potentiometer divider. The general
equation defining the output voltage with respect to ground for any
given input voltage applied to terminals AB is:
VW(Dx) = Dx/2
N * V
AB + VBeqn. 5
Since N=10,
VW(Dx) = (Dx/1024) * VAB + VB
eqn. 6
Operation of the digital potentiometer in the divider mode results in
more accurate operation over temperature. Here the output voltage
is dependent on the ratio of the internal resistors and not the
absolute value. Therefore, the drift reduces to 15ppm/°C.
ESD PROTECTION CIRCUITS
IN P U T S
L OGIC
PINS
GN D
V
DD
Figure 5A. Equivalent Digital Input ESD Protection
OU T P U T S
O1 & O2
PINS
GN D
V
DD
Figure 5B. Equivalent Digital Output ESD Protection
OUT P U T S
SDO
PIN
GND
V
DD
Figure 5C. Equivalent SDO Output ESD Protection Circuit
Figure 5 shows the equivalent ESD protection circuit for digital
pins. Figure 6 shows the equivalent analog-terminal protection
circuit for the variable resistors.
PO T E N T IO M E T E R
TE R M IN A L S
A, B, W
PIN S
V
SS
Figure 6. Equivalent VR-Terminal ESD Protection


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