CAT5120 Datasheet, PDF (1/11 Pages) Catalyst Semiconductor – 16-Tap MiniPot Digitally Programmable Potentiometers with 2-Wire Interface

CAT5120, CAT5121, CAT5122
16-Tap MiniPot™ Digitally Programmable Potentiometers
with 2-Wire Interface
ALOGEN ^FR
LEA _{D F REETM}
FEATURES
s 0.3µA Ultra-low supply current
s Single-supply operation: 2.7 V to 5.5 V
s Glitchless switching between resistor taps
s Power-on reset to midscale
s 2-Wire up/down serial interface
s Resistance values: 10kΩ, 50kΩ and 100kΩ
s Available in SC70 and SOT-23 packages
APPLICATIONS
s LCD screen adjustment
s Volume control
s Mechanical potentiometer replacement
s Gain adjustment
s Line impedance matching
DESCRIPTION
CAT5120/5121/5122 linear-taper digitally programmable
potentiometers perform the same function as a
mechanical potentiometer or a variable resistor. These
devices consist of a fixed resistor and a wiper contact
with 32-tap points that are digitally controlled through a
2-wire up/down serial interface.
The CAT5120 is configured as a potentiometer. The
CAT5121 and CAT5122 are configured as variable
resistors. See Pin Configurations for part functionality.
Three resistance values are available: 10kΩ , 50kΩ and
100kΩ. These are available in space-saving 5-pin and
6-pin SC70 and SOT-23 packages.
PIN CONFIGURE
FUNCTIONAL DIAGRAM
H
V_DD 1
GND 2
6H
5W
V_DD 1
GND 2
5H
V_DD
GND
CAT5120
CAT5122
CS
U/D 3
4 CS
U/D 3
4 CS
UP/DN
Counter
16-Position
Decoder
W
U/D
V_DD 1
6H
GND 2
5L
CAT5121
U/D 3
4 CS
Top View
© 2005 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
L
Doc. No. 2121, Rev. A