Rainbow Electronics MAX5484 - Manual

General Description
The MAX5481–MAX5484 10-bit (1024-tap) nonvolatile,
linear-taper, programmable voltage-dividers and vari-
able resistors perform the function of a mechanical
potentiometer, but replace the mechanics with a pin-
configurable 3-wire serial SPI™-compatible interface or
up/down digital interface. The MAX5481/MAX5482 are
3-terminal voltage-dividers and the MAX5483/MAX5484
are 2-terminal variable resistors.
The MAX5481–MAX5484 feature an internal, non-
volatile, electrically erasable programmable read-only
memory (EEPROM) that stores the wiper position for ini-
tialization during power-up. The 3-wire SPI-compatible
serial interface allows communication at data rates up
to 7MHz. A pin-selectable up/down digital interface is
also available.
The MAX5481–MAX5484 are ideal for applications
requiring digitally controlled potentiometers. Two end-to-
end resistance values are available (10k
Ω and 50kΩ) in a
voltage-divider or a variable-resistor configuration (see
the Selector Guide). The nominal resistor temperature
coefficient is 35ppm/°C end-to-end, and only 5ppm/°C
ratiometric, making these devices ideal for applications
requiring low-temperature-coefficient voltage-dividers,
such as low-drift, programmable gain-amplifiers.
The MAX5481–MAX5484 operate with either a +2.7V to
+5.25V single power supply or ±2.5V dual power sup-
plies. These devices consume 400µA (max) of supply
current when writing data to the nonvolatile memory
and 1.0µA (max) of standby supply current. The
MAX5481–MAX5484 are available in a space-saving
(3mm x 3mm), 16-pin TQFN, or a 14-pin TSSOP pack-
age and are specified over the extended (-40°C to
+85°C) temperature range.
Applications
Features
♦ 1024 Tap Positions
♦ Power-On Recall of Wiper Position from
Nonvolatile Memory
♦ 16-Pin (3mm x 3mm x 0.8mm) TQFN or 14-Pin
TSSOP Package
♦ 35ppm/°C End-to-End Resistance Temperature
Coefficient
♦ 5ppm/°C Ratiometric Temperature Coefficient
♦ 10kΩ and 50kΩ End-to-End Resistor Values
♦ Pin-Selectable SPI-Compatible Serial Interface or
Up/Down Digital Interface
♦ 1µA (max) Standby Current
♦ Single +2.7V to +5.25V Supply Operation
♦ Dual ±2.5V Supply Operation
MAX5481–MAX5484
10-Bit, Nonvolatile, Linear-Taper Digital
Potentiometers
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
16
15
14
13
V SS
N.C.
V DD
GND
9 10 11 12
SPI/
UD
DIN(U/
D
)
SCLK(
INC
)
CS
4 3 2 1
N.C.
L W H
5
6
7
8
N.C.
N.C.
N.C.
V SS INTERFACE
TOP VIEW
TQFN
*SEE FUNCTIONAL DIAGRAM
16
15
14
13
V SS
N.C.
V DD
GND
9 10 11 12
SPI/
UD
DIN(U/
D
)
SCLK(
INC
)
CS
4 3 2 1
N.C.
L W
D.N.C.
5
6
7
8
N.C.
N.C.
N.C.
V SS
MAX5483
MAX5484
INTERFACE
TQFN
MAX5481*
MAX5482*
Pin Configurations
19-3708; Rev 0; 5/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART † PIN-PACKAGE PKG CODE
TOP
MARK
MAX5481ETE 16 TQFN-EP** T1633F-3 ACP
MAX5481EUD* 14 TSSOP — —
Selector Guide appears at end of data sheet.
SPI is a trademark of Motorola, Inc.
† All devices are specified over the -40°C to +85°C operating
temperature range.
*Future product—contact factory for availability.
**EP = Exposed pad.
Ordering Information continued at end of data sheet.
Pin Configurations continued at end of data sheet.
Gain and Offset
Adjustment
LCD Contrast Adjustment
Pressure Sensors
Low-Drift Programmable
Gain Amplifiers
Mechanical Potentiometer
Replacement