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X9C303_07 Datasheet, PDF (1/10 Pages) Intersil Corporation – Logarithmic Digitally Controlled Potentiometer
X9C303
®
Logarithmic Digitally Controlled Potentiometer (XDCP™)
Data Sheet
January 24, 2007
FN8223.1
Terminal Voltage ±5V, 100 Taps, Log Taper
Description
The Intersil X9C303 is a digitally controlled potentiometer
(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 elements.
Between each element and at either end are tap points
accessible to the wiper terminal. The position 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 application advantages; (1) the
variability and reliability of a solid-state potentiometer, (2) the
flexibility of computer-based digital controls, and (3) the use
of nonvolatile memory for potentiometer settings retention.
Block Diagram
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, 32kΩ ±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
• Packages
- 8 Ld TSSOP
- 8 Ld SOIC
- 8 Ld PDIP
U/D
7-Bit
99
INC
Up/Down
CS
Counter
98
RH/VH
97
7-Bit
Nonvolatile
Memory
Store and
Recall
VCC
Control
VSS
Circuitry
96
One
of
One-
Hundred
Decoder
2
1
0
Transfer
Gates
Resistor
Array
RL/VL
RW/VW
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005, 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.