X9430
®
Programmable Analog
Data Sheet
March 11, 2005
FN8198.0
PRELIMINARY
DESCRIPTION
Dual Digitally Controlled Potentiometer
(XDCP™) with Operational Amplifier
The X9430 is a monolithic CMOS IC that incorporates
two operational amplifiers and two nonvolatile digitally
controlled potentiometers. The amplifiers are CMOS
differential input voltage operational amplifiers with
near rail-to-rail outputs. All pins for the two amplifiers
are brought out of the package to allow combining
them with the potentiometers or using them as com-
plete stand-alone amplifiers.
FEATURES
• Two CMOS voltage operational amplifiers
• Two digitally controlled potentiometers
• Can be combined or used separately
• Amplifiers
—Low voltage operation
—V+/V- = ±2.7V to ±5.5V
The digitally controlled potentiometers consist of a
series string of 63 polycrystalline resistors that behave
as standard integrated circuit resistors. The SPI serial
port, common to both pots, allows the user to program
the connection of the wiper output to any of the resis-
tor nodes in the series string. The wiper position is
saved in the on board E2 memory to allow for nonvola-
tile restoration of the wiper position.
—Rail-to-rail CMOS performance
—1MHz gain bandwidth product
• Digitally controlled potentiometer
—Dual 64 tap potentiometers
—R
= 10kΩ
total
—SPI serial interface
—V = 2.7V to 5.5V
CC
A wide variety of applications can be implemented
using the potentiometers and the amplifiers. A typical
application is to implement the amplifier as a wiper
buffer in circuits that use the potentiometer as a voltage
reference. The potentiometer can also be combined
with the amplifier yielding a digitally programmable gain
amplifier or programmable current source.
BLOCK DIAGRAM
VCC
RW0 RH0 RL0
V+
HOLD
VNI0
Control and
Memory
+
–
VOUT0
CS
SCK
SO
SI
A1
A0
WCR0
VINV0
VNI1
+
–
VOUT1
WCR1
VINV1
WP
RW1 RL1 RH1
VSS
V-
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. All Rights Reserved
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