X9421 Potentiometer Datasheet

X9421 Datasheet, PDF, Equivalent


Part Number

X9421

Description

Single Digitally Controlled (XDCP) Potentiometer

Manufacture

Xicor

Total Page 21 Pages
Datasheet
Download X9421 Datasheet


X9421
APPLICATION NOTES
AVAILABLE
AN99 • AN115 • AN120 • AN124 • AN133 • AN134 • AN135
Low Noise/Low Power/SPI Bus
X9421
Single Digitally Controlled (XDCP) Potentiometer
FEATURES
• Single Voltage Potentiometer
• 64 Resistor Taps
• SPI Serial Interface for write, read, and transfer
operations of the potentiometer
Wiper Resistance, 150Typical at 5V
• 4 Non-Volatile Data Registers
• Non-Volatile Storage of Multiple Wiper Positions
• Power On Recall. Loads Saved Wiper Position on
Power Up.
• Standby Current < 5µA Max
• VCC : 2.7V to 5.5V Operation
2.5K, 10KEnd to End Resistance
• 100 yr. Data Retention
• Endurance: 100, 000 Data Changes per Bit per
Register
• 14-Lead TSSOP, 16-Lead SOIC
• Low Power CMOS
DESCRIPTION
The X9421 integrates a single digitally controlled
potentiometer (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 SPI bus
interface. The potentiometer has associated with it a
volatile Wiper Counter Register (WCR) and a 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. Powerup 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
VCC
SPI
bus
interface
address
data
status
Bus
Interface &
Control
write
read
transfer
inc / dec
control
Power On Recall
Wiper Counter
Register (WCR)
Data Registers
4 Bytes
RH/VH
wiper
10K
64-taps
POT
VSS
RW/VW RL/VL
REV 1.1.6 8/1/02
www.xicor.com
Characteristics subject to change without notice. 1 of 21

X9421
X9421
DETAILED FUNCTIONAL DIAGRAM
VCC
HOLD
CS
SCK
SO
SI
A0
WP
INTERFACE
AND
CONTROL
CIRCUITRY
Control
DATA
VSS
Power On Recall
DR0 DR1
WIPER
COUNTER
REGISTER
DR2 DR3 (WCR)
10K
64--taps
RH/VH
RL/VL
RW/VW
CIRCUIT LEVEL APPLICATIONS
• Vary the gain of a voltage amplifier
• Provide programmable dc reference voltages for
comparators and detectors
• Control the volume in audio circuits
• Trim out the offset voltage error in a voltage amplifier
circuit
• Set the output voltage of a voltage regulator
• Trim the resistance in Wheatstone bridge circuits
• Control the gain, characteristic frequency and
Q-factor in filter circuits
• Set the scale factor and zero point in sensor signal
conditioning circuits
• Vary the frequency and duty cycle of timer ICs
• Vary the dc biasing of a pin diode attenuator in RF
circuits
• Provide a control variable (I, V, or R) in feedback
circuits
SYSTEM LEVEL APPLICATIONS
• Adjust the contrast in LCD displays
• Control the power level of LED transmitters in
communication systems
• Set and regulate the DC biasing point in an RF
power amplifier in wireless systems
• Control the gain in audio and home entertainment
systems
• Provide the variable DC bias for tuners in RF
wireless systems
• Set the operating points in temperature control
systems
• Control the operating point for sensors in industrial
systems
• Trim offset and gain errors in artificial intelligent
systems
REV 1.1.6 8/1/02
www.xicor.com
Characteristics subject to change without notice. 2 of 21


Features APPLICATION NOTES A V A I L A B L E AN99 • AN115 • AN120 • AN124 • AN13 3 • AN134 • AN135 Low Noise/Low Po wer/SPI Bus X9421 Single Digitally Con trolled (XDCP) Potentiometer FEATURES Single Voltage Potentiometer • 64 Resistor Taps • SPI Serial Interface for write, read, and transfer operation s of the potentiometer • Wiper Resist ance, 150Ω Typical at 5V • 4 Non-Vo latile Data Registers • Non-Volatile Storage of Multiple Wiper Positions • Power On Recall. Loads Saved Wiper Pos ition on Power Up. • Standby Current < 5µA Max • VCC : 2.7V to 5.5V Opera tion • 2.5KΩ, 10KΩ End to End Res istance • 100 yr. Data Retention • Endurance: 100, 000 Data Changes per Bi t per Register • 14-Lead TSSOP, 16-Le ad SOIC • Low Power CMOS DESCRIPTION The X9421 integrates a single digitally controlled potentiometer (XDCP) on a m onolithic CMOS integrated circuit. The digital controlled potentiometer is imp lemented using 63 resistive elements in a series array. Between each element are tap points connected to the w.
Keywords X9421, datasheet, pdf, Xicor, Single, Digitally, Controlled, XDCP, Potentiometer, 9421, 421, 21, X942, X94, X9, Equivalent, stock, pinout, distributor, price, schematic, inventory, databook, Electronic, Components, Parameters, parts, cross reference, chip, Semiconductor, circuit, Electric, manual, substitute




@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)