Single Volatile 32-Tap XDCP™ Digitally Controlled Potentiometer (XDCP)
The Intersil ISL90460 is a digitally controlled potentiometer
(XDCP). Configured as a variable resistor, the device
consists of a resistor array, wiper switches, a control section,
and volatile memory. The wiper position is controlled by a
2-pin Up/Down interface.
The potentiometer is implemented by a resistor array
composed of 31 resistive elements and a wiper switching
network. Between each element and at either end are tap
points accessible to the wiper terminal. The position of the
wiper element is controlled by the CS and U/D inputs.
The device can be used in a wide variety of applications
including:
• LCD contrast control
• Parameter and bias adjustments
• Industrial and automotive control
• Transducer adjustment of pressure, temperature, position,
chemical, and optical sensors
• Laser Diode driver biasing
• Gain control and offset adjustment
Features
• Volatile Solid-State Potentiometer
• 2-pin UP/DN Interface
• DCP Terminal Voltage, 2.7V to 5.5V
• Tempco 35ppm/
°C Typical
• 32 Wiper Tap Points
• Low Power CMOS
- Active current 25µA max.
- Supply current 0.3µA
• Available R
TOTAL
Values = 10k50k100k
• Temp Range
-40°C to +85°C
• Packages
- 5 Ld SC-70, SOT-23
• Pb-Free Plus Anneal Available (RoHS Compliant)
Pinout
ISL90460
(5 LD SOT-23, SC-70)
TOP VIEW
VDD
RH
GND
U/D
CS
FN8225 Rev 4.00
October 22, 2015
Page 1 of 8
ISL90460
Ordering Information
PART NUMBER
PART MARKING
R
TOTAL
(K)
10
TEMP RANGE (°C)
-40 to +85
PACKAGE (Tape and Reel)
5 Ld SC-70 (Pb-free)
PKG. DWG. #
P5.049
ISL90460WIE527Z-TK (See Note) DDY
No longer available or supported,
recommended replacement:
ISL90460TIH527Z-TK
ISL90460WIH527Z -TK (See Note) DDZ
ISL90460UIE527Z-TK (See Note) DDW
No longer available or supported,
recommended replacement:
ISL90460TIH527Z-TK
ISL90460UIH527Z -TK (See Note) DDX
No longer available or supported,
recommended replacement:
ISL90460TIH527Z-TK
ISL90460TIE527Z-TK (See Note) DDU
No longer available or supported,
recommended replacement:
ISL90460TIH527Z-TK
ISL90460TIH527Z-TK (See Note)
DDV
100
50
-40 to +85
-40 to +85
5 Ld SOT-23 (Pb-free)
5 Ld SC-70 (Pb-free)
P5.064
P5.049
-40 to +85
5 Ld SOT-23 (Pb-free)
P5.064
-40 to +85
5 Ld SC-70 (Pb-free)
P5.049
-40 to +85
5 Ld SOT-23 (Pb-free)
P5.064
NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are
RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed
CAUTION: Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only; functional operation
of the device (at these or any other conditions above those listed in the operational sections of this specification) is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
Potentiometer Specifications
Over recommended operating conditions unless otherwise stated
SYMBOL
R
TOT
PARAMETER
End to end resistance
W version
U version
T version
V
R
R
H
, R
L
terminal voltages
Noise
R
W
I
W
Wiper Resistance
Wiper Current
Resolution
Absolute linearity (Note 1)
Relative linearity (Note 2)
R
TOTAL
temperature coefficient
C
H
/C
L
/C
W
NOTES:
1. Absolute linearity is utilized to determine actual wiper voltage versus expected voltage = (R
H
(n)
(actual) - R
H
(n)
(expected)) = ±1 Ml Maximum.
n = 1 .. 29 only.
2. Relative linearity is a measure of the error in step size between taps = R
H
(n+1)
- [R
H
(n)
+ Ml] = ±0.5 Ml, n = 1 .. 29 only.
3. 1 Ml = Minimum Increment = R
TOT
/31.
4. Typical values are for T
A
= 25°C and nominal supply voltage.
Potentiometer capacitances
See equivalent circuit
R
H(n)(actual)
- R
H(n)(expected)
R
H(n+1)
- [R
H(n)+MI
]
±35
10/10/25
1
Ref: 1kHz
CONDITIONS
MIN
8
40
80
0
-120
600
0.6
32
±1
±0.5
TYP
(Note 4)
10
50
100
MAX
12
60
120
V
CC
UNIT
k
k
k
V
dBV
mA
Taps
MI
(Note 3)
MI
(Note 3)
ppm/°C
pF
Equivalent Circuit
R
TOTAL
R
H
C
H
C
W
C
L
R
L
R
W
FN8225 Rev 4.00
October 22, 2015
Page 3 of 8
ISL90460
DC Electrical Specifications
SYMBOL
I
CC
I
SB
I
LI
I
LI
V
IH
V
IL
C
IN
Over recommended operating conditions unless otherwise specified.
PARAMETER
VCC active current (Increment)
Standby supply current
CS input leakage current
U/D input leakage current
CS, U/D input HIGH voltage
CS, U/D input LOW voltage
CS, U/D input capacitance
V
CC
= 3V, V
IN
= V
SS
, T
A
= 25°C,
f = 1MHz
10
TEST CONDITIONS
CS = 0V, U/D = f
clock
= 1MHz and
V
CC
= 3V
CS = V
CC
, U/D = V
SS
or V
CC
= 3V
V
IN
= V
SS
to V
CC
V
IN
= V
SS
to V
CC
V
CC
x 0.7
V
CC
x 0.3
0.3
MIN
TYP
(Note 4)
MAX
25
1
±1
±1
UNIT
µA
µA
µA
µA
V
V
pF
Timing Specifications
SYMBOL
t
CU
t
CI
t
IC
t
lL
t
lH
f
TOGGLE
t
SETTLE
U/D to CS setup
CS to U/D setup
CS to U/D hold
U/D LOW period
U/D HIGH period
Over recommended operating conditions unless otherwise specified) (Figures 1 and 2)
PARAMETER
MIN
25
50
25
300
300
1
1
TYP (Note 4)
MAX
UNIT
ns
ns
ns
ns
ns
MHz
µs
Up/Down toggle rate
Output settling time
CS
t
CU
t
IL
t
IC
U/D
t
CI
t
IH
t
SETTLE
RH
FIGURE 1. SERIAL INTERFACE TIMING DIAGRAM, INCREMENT
FN8225 Rev 4.00
October 22, 2015
Page 4 of 8
ISL90460
CS
t
CU
t
IH
U/D
t
CI
RH
t
IL
t
SETTLE
t
IC
FIGURE 2. SERIAL INTERFACE TIMING DIAGRAM, DECREMENT
Pin Descriptions
RH
The ISL90460 contains a digital potentiometer connected as a
rheostat or variable resistor. The wiper and one terminal of the
digital potentiometer is tied to the RH pin, and the other
terminal of the potentiometer is tied to the ground pin (GND).
The resistance from the RH pin to ground will vary with the
potentiometer setting; at the highest setting, the resistance will
be the maximum (Rtot), at the lowest setting it will be a
minimum.
Principles of Operation
There are two sections of the ISL90460: the input control,
counter and decode section; and the resistor array. The input
control section operates just like an up/down counter. The
output of this counter is decoded to turn on a single electronic
switch connecting a point on the resistor array to the wiper
output. The resistor array is comprised of 31 individual
resistors connected in series. At either end of the array and
between each resistor is an electronic switch that transfers the
connection at that point to the wiper. The wiper is connected to
the RH terminal, forming a variable resistor from RH to GND.
The direction of the wiper movement is defined when the
device is selected. If during CS transition from High to Low the
U/D input is LOW, the wiper will move down on each rising
edge of U/D toggling. Similarly, the wiper will move up on each
rising edge of U/D toggling if, during CS transition from High to
Low, the U/D input is High.
The wiper, when at either fixed terminal, acts like its
mechanical equivalent and does not move beyond the last
position. That is, the counter does not wrap around when
clocked to either extreme.
If the wiper is moved several positions, multiple taps are
connected to the wiper for t
SETTLE
(U/D to RH change). The
2-terminal resistance value for the device can temporarily
change by a significant amount if the wiper is moved several
positions.
Up/Down (U/D)
The U/D input controls the direction of the wiper movement
and whether the counter is incremented or decremented.
Chip Select (CS)
The device is selected when the CS input is LOW. The current
counter value is stored in volatile memory when CS is returned
HIGH. When CS is high, the device is placed in low power
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