X9400
®
Low Noise/Low Power/SPI Bus
Data Sheet
July 28, 2006
FN8189.3
DESCRIPTION
Quad Digitally Controlled Potentiometers
(XDCP™)
The X9400 integrates four digitally controlled
potentiometers (XDCPs) on a monolithic CMOS
integrated circuit.
FEATURES
• Four potentiometers per package
• 64 resistor taps
The digitally controlled potentiometer is implemented
using 63 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
serial bus interface. Each potentiometer has
associated with it a volatile Wiper Counter Register
(WCR) and four nonvolatile Data Registers (DR0-3)
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 through the switches.
Power-up recalls the contents of DR0 to the WCR.
• SPI serial interface for write, read, and transfer
operations of the potentiometer
• Wiper resistance, 40Ω typical at 5V.
• Four non-volatile data registers for each
potentiometer
• Non-volatile storage of multiple wiper position
• Power-on recall. Loads saved wiper position on
power-up.
• Standby current < 1µA max
• System V : 2.7V to 5.5V operation
CC
+
–
• Analog V /V : -5V to +5V
• 10kΩ, 2.5kΩ end to end resistance
• 100 yr. data retention
• Endurance: 100,000 data changes per bit per
register
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.
• Low power CMOS
• 24 Ld SOIC and 24 Ld TSSOP
• Pb-free plus anneal available (RoHS compliant)
BLOCK DIAGRAM
V
V
CC
SS
Pot 0
R0 R1
R2 R3
V
/R
H0 H0
R0 R1
R2 R3
V+
V-
Wiper
Counter
Register
(WCR)
Wiper
Counter
Register
(WCR)
V
/R
H2 H2
Resistor
Array
Pot 2
V
/R
L0 L0
HOLD
V
/R
L2 L2
CS
SCK
SO
SI
V
/R
W0 W0
V
/R
W2 W2
Interface
and
Control
8
Circuitry
A0
A1
V
/R
W1 W1
Data
V
/R
W3 W3
WP
R0 R1
R2 R3
R0 R1
R2 R3
V
/R
Wiper
Counter
Register
(WCR)
H1 H1
V
/R
Resistor
Array
Pot 1
Wiper
Counter
Register
(WCR)
H3 H3
Resistor
Array
Pot 3
V
/R
L1 L1
V
/R
L3 L3
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1
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.