X9408_14 Datasheet, PDF (1/20 Pages) Intersil Corporation – Quad Digitally Controlled Potentiometers

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Data Sheet
X9408
Low Noise/Low Power/2-Wire Bus
January 15, 2009
FN8191.4
Quad Digitally Controlled (XDCP™)
Potentiometers
Description
The X9408 integrates four digitally controlled potentiometers
(XDCP) on a monolithic CMOS integrated circuit.
The digital 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 2-wire bus interface. Each
potentiometer has associated with it a volatile Wiper Counter
Register (WCR) and four non-volatile Data Registers 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
the default data register (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
Features
• Four Potentiometers in One Package
• 64 Resistor Taps per Potentiometer
• 2-wire Serial Interface
• Wiper Resistance, 40Ω Typical at 5V
• Four Nonvolatile Data Registers for Each Pot
• Nonvolatile Storage of Wiper Position
• Standby Current < 1µA max (Total Package)
• V_CC = 2.7V to 5.5V Operation
V+ = 2.7V to 5.5V
V- = -2.7V to -5.5V
• 10kΩ, 2.5kΩ End to End Resistances
• High reliability
• Endurance–100,000 Data Changes Per Bit Per Register
• Register Data Retention–100 years
• 24 Ld SOIC, 24 Ld TSSOP, 24 Ld PDIP Packages
• Pb-Free (RoHS Compliant)
V_CC
V+
V_SS
V-
WP
SCL
SDA
A0
A1
A2
A3
INTERFACE
AND
CONTROL
CIRCUITRY
8
DATA
POT 0
R0 R1
WIPER
COUNTER
REGISTER
R2 R3 ^(WCR)
V_H0/R_H0
V_L0/R_L0
V_W0/R_W0
R0 R1 _WIPER
COUNTER
REGISTER
R2 R3 ^(WCR)
RESISTOR
ARRAY
POT 2
V_H2/R_H2
V_L2/R_L2
V_W2/R_W2
V_W1/R_W1
R0 R1
WIPER
COUNTER
REGISTER
R2 R3 ^(WCR)
RESISTOR
ARRAY
POT 1
V_H1/R_H1
V_L1/R_L1
V_W3/R_W3
R0 R1
WIPER
COUNTER
REGISTER
R2 R3 ^(WCR)
RESISTOR
ARRAY
POT 3
V_H3/R_H3
V_L3/R_L3
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005, 2009. All Rights Reserved
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