APPLICATION NOTE
A V A I L A B L E
AN20 • AN42–53 • AN71 • AN73 • AN88 • AN91–92 • AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135
Low Noise, Low Power, 32 Taps
X9315
Digitally Controlled Potentiometer (XDCP™)
FEATURES
DESCRIPTION
• Solid-state potentiometer
• 3-wire serial interface
• 32 wiper tap points
—Wiper position stored in nonvolatile memory
and recalled on power-up
The Xicor X9315 is a digitally controlled potentiometer
(XDCP). The device consists of a resistor array, wiper
switches, a control section, and nonvolatile memory.
The wiper position is controlled by a 3-wire 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, U/D, and INC inputs. The
position of the wiper can be stored in nonvolatile
memory and then be recalled upon a subsequent
power-up operation.
• 31 resistive elements
—Temperature compensated
—End to end resistance range 2ꢀ0
—Terminal voltage, ꢀ to V
• Low power CMOS
CC
—V = 2.7V or 5V
CC
—Active current, 5ꢀ/4ꢀꢀµA max.
—Standby current, 1µA max.
• High reliability
—Endurance, 1ꢀꢀ,ꢀꢀꢀ data changes per bit
—Register data retention, 1ꢀꢀ years
The device can be used as a three-terminal
potentiometer or as a two-terminal variable resistor in
a wide variety of applications including:
• R
• Packages
values = 1ꢀKΩ, 5ꢀKΩ, 1ꢀꢀKΩ
TOTAL
– control
—8-lead SOIC, MSOP and DIP
– parameter adjustments
– signal processing
BLOCK DIAGRAM
U/D
INC
CS
5-Bit
R /V
31
H
H
Up/Down
Counter
V
(Supply Voltage)
CC
30
29
28
R /V
H
H
Up/Down
(U/D)
5-Bit
Nonvolatile
Memory
Control
and
Increment
(INC)
One
of
Thirty
Two
R
/V
W
W
Memory
Transfer
Gates
Resistor
Array
Device Select
(CS)
R /V
Decoder
L
L
2
Store and
Recall
Control
Circuitry
V
(Ground)
SS
1
0
V
V
CC
SS
General
R /V
L
L
R
/V
W
W
Detailed
XDCP™ is a trademark of Xicor, Inc.
REV 1.3.2 1/14/03
Characteristics subject to change without notice. 1 of 13
www.xicor.com