X9430 Datasheet, PDF (1/21 Pages) Xicor Inc. – Dual Digitally Controlled Potentiometer (XDCP™) with Operational Amplifier

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Dual Digitally Controlled Potentiometer
(XDCP™) with Operational Amplifier
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
—Rail-to-rail CMOS performance
—1MHz gain bandwidth product
• Digitally controlled potentiometer
—Dual 64 tap potentiometers
—R_total = 10kΩ
—SPI serial interface
—V_CC = 2.7V to 5.5V
X9430
Programmable Analog
March 11, 2005
FN8198.0
DESCRIPTION
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.
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.
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
V_CC
R_W0 R_H0 R_L0
V+
HOLD
CS
SCK
SO
SI
A1
A0
Control and
Memory
WCR0
WCR1
V_NI0
+
–
V_OUT0
V_INV0
V_NI1
+
–
V_OUT1
V_INV1
WP
V_SS
R_W1 R_L1 R_H1
V-
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. All Rights Reserved
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