X9250_14 Datasheet, PDF (1/20 Pages) Intersil Corporation – Quad Digitally Controlled Potentiometers

®
Data Sheet
X9250
Low Noise/Low Power/SPI Bus/256 Taps
August 29, 2006
FN8165.3
Quad Digitally Controlled Potentiometers
(XDCP™)
FEATURES
• Four potentiometers in one package
• 256 resistor taps/pot - 0.4% resolution
• SPI serial interface
• Wiper resistance, 40Ω typical @ V_CC = 5V
• Four nonvolatile data registers for each pot
• Nonvolatile storage of wiper position
• Standby current < 5µA max (total package)
• Power supplies
—V_CC = 2.7V to 5.5V
—V+ = 2.7V to 5.5V
—V– = -2.7V to -5.5V
• 100kΩ, 50kΩ total pot resistance
• High reliability
—Endurance – 100,000 data changes per bit per
register
—Register data retention - 100 years
• 24 Ld SOIC, 24 Ld TSSOP
• Dual supply version of X9251
• Pb-free plus anneal available (RoHS compliant)
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
V_CC
V+
V_SS
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
V_H0/R_H0
V_L0/R_L0
V_W0/R_W0
R₀ R₁
R₂ R₃
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 2
V_H2/R_H2
V_L2/R_L2
V_W2/R_W2
R₀ R₁
R₂ R₃
Wiper
Counter
Register
(WCR)
V_W1/R_W1
Resistor
Array
Pot1
V_H1/R_H1
V_L1/R_L1
R₀ R₁
R₂ R₃
Wiper
Counter
Register
(WCR)
Resistor
Array
Pot 3
V_W3/R_W3
V_H3/R_H3
V_L3/R_H3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005, 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.