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X9430 Datasheet Preview

X9430 Datasheet

Dual Digitally Controlled Potentiometer (XDCP) with Operational Amplifier

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X9430PPrrDNeoOulgciTN1aom-rORn8la8tEiDRamn8CcE-iOItagCNmoMrOTiuytMEMaraRETMbIlSeNlnEylcIDeLfNhEoCnDoDAirrEocmwDFannlOwRaStaRwrEulto.oNPpiinolpLEgtloAeWenrrCdstDEiClEM.PecSnEooItmNGetTer/NtsanScttiometer (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
—Rtotal = 10k¾
—SPI serial interface
—VCC = 2.7V to 5.5V
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 resistor
nodes in the series string. The wiper position is saved
in the on board E2 memory to allow for nonvolatile res-
toration of the wiper position.
A wide variety of applications can be implemented
using the potentiometers and the amplifiers. A typical appli-
cation is to implement the amplifier as a wiper buffer in
circuits that use the potentiometer as a voltage refer-
ence. The potentiometer can also be combined with
the amplifier yielding a digitally programmable gain
amplifier or programmable current source.
BLOCK DIAGRAM
HOLD
VCC
RW0 RH0 RL0
CS
SCK
SO
SI
A1
A0
Control and
Memory
WCR0
WCR1
WP VSS
RW1 RL1 RH1
V+
VNI0
+
VOUT0
VINV0
VNI1
+
VOUT1
VINV1
V–
REV 1.0 6/20/00
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Characteristics subject to change without notice. 1 of 21




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X9430 Datasheet Preview

X9430 Datasheet

Dual Digitally Controlled Potentiometer (XDCP) with Operational Amplifier

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X9430 – Preliminary Information
PIN DESCRIPTIONS
Host Interface Pins
Serial Output (SO)
SO is a push/pull serial data output pin. During a read
cycle, data is shifted out on this pin. Data is clocked
out by the falling edge of the serial clock.
Serial Input (SI)
SI is the serial data input pin. All opcodes, byte
addresses and data to be written to the device are
input on this pin. Data is latched by the rising edge of
the serial clock.
Serial Clock (SCK)
The SCK input is used to clock data into and out of the
X9430.
Chip Select (CS)
When CS is HIGH, the X9430 is deselected and the
SO pin is at high impedance, and (unless an internal
write cycle is underway) the device will be in the
standby state. CS LOW enables the X9430, placing it
in the active power mode. It should be noted that after
a power-up, a HIGH to LOW transition on CS is
required prior to the start of any operation.
Hardware Write Protect Input WP
The WP pin when low prevents nonvolatile writes to
the wiper counter register.
Hold (HOLD)
HOLD is used in conjunction with the CS pin to select
the device. Once the part is selected and a serial
sequence is underway, HOLD may be used to pause
the serial communication with the controller without
resetting the serial sequence. To pause, HOLD must
be brought LOW while SCK is LOW. To resume com-
munication, HOLD is brought HIGH, again while SCK
is LOW. If the pause feature is not used, HOLD should
be held HIGH at all times.
Device Address (A0–A1)
The address inputs are used to set the least significant
2 bits of the 8-bit slave address. A match in the slave
address serial data stream must be made with the
address input in order to initiate communication with
the X9430. A maximum of 4 devices may occupy the
SPI serial bus.
Potentiometer Pins1
RH (RH0–RH1), RL (RL0–RL1)
The RH and RL inputs are equivalent to the terminal
connections on either end of a mechanical potentiom-
eter.
RW (RW0–RW1)
The wiper output is equivalent to the wiper output of a
mechanical potentiometer.
Amplifier and Device Pins
Amplifier Input Voltage VNI(0,1) and VINV(0,1)
VNI and VINV are inputs to the noninverting (+) and
inverting (-) inputs of the operational amplifiers.
Amplifier Output Voltage VOUT(0,1)
VOUT is the voltage output pin of the operational ampli-
fier.
Analog Supplies V+, V-
The Analog Supplies V+, V- are the supply voltages for
the XDCP analog section and the operational amplifi-
ers.
System Supply VCC and Ground VSS
The system supply VCC and its reference VSS is used
to bias the interface and control circuits.
1. Alternate designations for RH, RL, RW are VH, VL, VW
REV 1.0 6/20/00
www.xicor.com
Characteristics subject to change without notice. 2 of 21


Part Number X9430
Description Dual Digitally Controlled Potentiometer (XDCP) with Operational Amplifier
Maker Xicor
Total Page 21 Pages
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