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Xicor - Quad Digitally Controlled Potentiometers (XDCP)

Numéro de référence X9250
Description Quad Digitally Controlled Potentiometers (XDCP)
Fabricant Xicor 
Logo Xicor 





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X9250 fiche technique
APPLICATION NOTE
AVAILABLE
AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135
Low Noise/Low Power/SPI Bus/256 Taps
X9250
Quad Digitally Controlled Potentiometers (XDCP)
FEATURES
• Four potentiometers in one package
• 256 resistor taps/pot–0.4% resolution
• SPI serial interface
• Wiper resistance, 40typical @ VCC = 5V
• Four nonvolatile data registers for each pot
• Nonvolatile storage of wiper position
• Standby current < 5µA max (total package)
• Power supplies
—VCC = 2.7V to 5.5V
—V+ = 2.7V to 5.5V
—V– = -2.7V to -5.5V
• 100K, 50Ktotal pot resistance
• High reliability
—Endurance – 100,000 data changes per bit per
register
—Register data retention – 100 years
• 24-lead SOIC, 24-lead TSSOP, 24-lead CSP (Chip
Scale Package)
• Dual supply version of X9251
DESCRIPTION
The X9250 integrates 4 digitally controlled
potentiometers (XDCP) on a monolithic CMOS
integrated circuit.
The digitally controlled potentiometer is implemented
using 255 resistive elements in a series array.
Between each element are tap points connected to
the wiper terminal through switches. The position of
the wiper on the array is controlled by the user through
the SPI bus interface. Each potentiometer has
associated with it a volatile Wiper Counter Register
(WCR) and 4 nonvolatile Data Registers (DR0:DR3)
that can be directly written to and read by the user.
The contents of the WCR controls the position of the
wiper on the resistor array though the switches. Power
up recalls the contents of DR0 to the WCR.
The XDCP can be used as a three-terminal
potentiometer or as a two-terminal variable resistor in
a wide variety of applications including control,
parameter adjustments, and signal processing.
BLOCK DIAGRAM
VCC
VSS
V+
V-
HOLD
CS
SCK
SO
SI
A0
A1
WP
Interface
and
Control
Circuitry
8
Data
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Pot 0
VH0/RH0
VL0/RL0
VW0/RW0
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 2
VH2/RH2
VL2/RL2
VW2/RW2
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
VW1/RW1
Resistor
Array
Pot1
VH1/RH1
VL1/RL1
R0 R1
R2 R3
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 3
VW3/RW3
VH3/RH3
VL3/RH3
REV 1.1.5 1/31/03
www.xicor.com
Characteristics subject to change without notice. 1 of 21

PagesPages 21
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