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Xicor

X9C303 Datasheet Preview

X9C303 Datasheet

Digitally Controlled Potentiometer

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APPLICATION NOTE
AVAILABLE
AN42 • AN44–48 • AN50 • AN52 • AN53 • AN71 • AN92
Terminal Voltage ±5V, 100 Taps, Log Taper
X9C303
Digitally Controlled Potentiometer (XDCP)
FEATURES
• Solid-state potentiometer
• Three-wire serial interface
• 100 wiper tap points
—Wiper position stored in nonvolatile memory
and recalled on power-up
• 99 resistive elements, log taper
—Temperature compensated
—End to end resistance, ±15%
—Terminal voltages, ±5V
• Low power CMOS
—VCC = 5V
—Active current, 3mA max.
—Standby current, 750µA max.
• High reliability
—Endurance, 100,000 data changes per bit
—Register data retention, 100 years
• X9C303, 32 k
• Packages
www.DataSheet4U.com — 8-lead TSSOP
—8-lead SOIC
—8-pin DIP
DESCRIPTION
The Xicor X9C303 is a digitally controlled potentiome-
ter (XDCP). The device consists of a resistor array,
wiper switches, a control section, and nonvolatile
memory. The wiper position is controlled by a three-
wire interface.
The resistor array is composed of 99 resistive ele-
ments. Between each element and at either end are
tap points accessible to the wiper terminal. The posi-
tion of the wiper element is controlled by the CS, U/D,
and INC inputs. The position of the wiper can be
stored in nonvolatile memory and then be recalled
upon a subsequent power-up operation.
The device can be used as a three-terminal potentio-
meter or as a two-terminal variable resistor in a wide
variety of applications ranging from control, to signal
processing, to parameter adjustment. Digitally-
controlled potentiometers provide three powerful appli-
cation advantages; (1) the variability and reliability of a
solid-state potentiometer, (2) the flexibility of com-
puter-based digital controls, and (3) the use of nonvol-
atile memory for potentiometer settings retention.
BLOCK DIAGRAM
U/D
INC
CS
7-Bit
Up/Down
Counter
7-Bit
Nonvolatile
Memory
Store and
Recall
VCC
VSS
Control
Circuitry
XDCPis a trademark of Xicor, Inc.
REV 1.1 4/27/01
99
98
97
96
One
of
One-
Hundred
Decoder
2
1
0
RH/VH
Transfer
Gates
Resistor
Array
RL/VL
RW/VW
www.xicor.com
Characteristics subject to change without notice. 1 of 10




Xicor

X9C303 Datasheet Preview

X9C303 Datasheet

Digitally Controlled Potentiometer

No Preview Available !

X9C303
PIN DESCRIPTIONS
VH and VL
The high (VH) and low (VL) terminals of the device are
equivalent to the fixed terminals of a mechanical
potentiometer. The minimum voltage is –5V and the
maximum is +5V. It should be noted that the terminol-
ogy of VL and VH references the relative position of the
terminal in relation to wiper movement direction
selected by the U/D input and not the voltage potential
on the terminal.
VW
VW is the wiper terminal, equivalent to the movable ter-
minal of a mechanical potentiometer. The position of
the wiper within the array is determined by the control
inputs. The wiper terminal series resistance is typically
40.
Up/Down (U/D)
The U/D input controls the direction of the wiper move-
ment and whether the counter is incriminated or decre-
mented.
Increment (INC)
The INC input is negative-edge triggered. Toggling INC
will move the wiper and either increment or decrement
the counter in the direction indicated by the logic level
on the U/D input.
Chip Select (CS)
The device is selected when the CS input is LOW. The
current counter value is stored in nonvolatile memory
when CS is returned HIGH while the INC input is also
HIGH. After the store operation is complete the device
will be placed in the low power standby mode until the
device is selected once again.
PIN CONFIGURATION
PIN NAMES
Symbol
VH
VW
VL
VSS
VCC
U/D
INC
CS
NC
Description
High Terminal (Potentiometer)
Wiper Terminal (Potentiometer)
Low Terminal (Potentiometer)
Ground
Supply Voltage
Up/Down Control Input
Increment Control Input
Chip Select Control Input
No Connection
POTENTIOMETER RELATIONSHIPS
VH
(VS) R99
S100
S99
R98 S98
VW
S3
R2 S2
R1
VL
S1
Gi = 20Log-R----1-----+--R---R--T--2--O---+--T---.-A---.--L-.---+-----R----i = V-V----W-S---(VL = 0V)
R1 + R2 + . . . + R99 @ 33K= RTOTAL
(Refer Test Circuit 1)
DIP/SOIC/(TSSOP)
(CS) INC
(VCC) U/D
(INC) VH
(U/D) VSS
18
27
X9C303
36
45
VCC (VL)
CS (VW)
VL (VSS)
VW (VH)
REV 1.1 4/27/01
www.xicor.com
Characteristics subject to change without notice. 2 of 10


Part Number X9C303
Description Digitally Controlled Potentiometer
Maker Xicor
Total Page 10 Pages
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