MAX5487 Datasheet, PDF (1/14 Pages) Maxim Integrated Products – Dual, 256-Tap, Nonvolatile, SPI-Interface, Linear-Taper Digital Potentiometers

19-3478; Rev 1; 1/05
Dual, 256-Tap, Nonvolatile, SPI-Interface,
Linear-Taper Digital Potentiometers
General Description
The MAX5487/MAX5488/MAX5489 dual, linear-taper,
digital potentiometers function as mechanical poten-
tiometers with a simple 3-wire SPI™-compatible digital
interface that programs the wipers to any one of 256
tap positions. These digital potentiometers feature a
nonvolatile memory (EEPROM) to return the wipers to
their previously stored positions upon power-up.
The MAX5487 has an end-to-end resistance of 10kΩ,
while the MAX5488 and MAX5489 have resistances of
50kΩ and 100kΩ, respectively. These devices have a
low 35ppm/°C end-to-end temperature coefficient, and
operate from a single +2.7V to +5.25V supply.
The MAX5487/MAX5488/MAX5489 are available in a
16-pin 3mm x 3mm x 0.8mm thin QFN package. Each
device is guaranteed over the extended -40°C to +85°C
temperature range.
Applications
LCD Screen Adjustment
Audio Volume Control
Mechanical Potentiometer Replacement
Low-Drift Programmable Filters
Low-Drift Programmable-Gain Amplifiers
Features
o Wiper Position Stored in Nonvolatile Memory
(EEPROM) and Recalled Upon Power-Up or
Recalled by an Interface Command
o 3mm x 3mm x 0.8mm Thin QFN Package
o ±1 LSB INL, ±0.5 LSB DNL (Voltage-Divider Mode)
o 256 Tap Positions
o 35ppm/°C End-to-End Resistance Temperature
Coefficient
o 5ppm/°C Ratiometric Temperature Coefficient
o 10kΩ, 50kΩ, and 100kΩ End-to-End Resistance
Values
o SPI-Compatible Serial Interface
o Reliability
200,000 Wiper Store Cycles
50-Year Wiper Data Retention
o +2.7V to +5.25V Single-Supply Operation
SPI is a trademark of Motorola, Inc.
Ordering Information/Selector Guide
PART
TEMP RANGE
PIN-PACKAGE
MAX5487ETE*
MAX5488ETE
MAX5489ETE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
16 Thin QFN-EP**
16 Thin QFN-EP**
16 Thin QFN-EP**
*Future product—contact factory for availability.
**EP = Exposed pad.
Functional Diagram
END-TO-END
RESISTANCE (kΩ)
10
50
100
TOP MARK
ABR
ABS
ABT
Pin Configuration
V_DD
HA
8-BIT
8
256
GND
LATCH
DECODER
WA
SCLK
SPI
LA
DIN
INTERFACE
16-BIT
NV RAM
POR
CS
HB
8
256
8-BIT
DECODER
WB
LATCH
MAX5487
LB
MAX5488
MAX5489
TOP VIEW
16 15 14 13
VDD 1
SCLK 2
DIN 3
CS 4
MAX5487
MAX5488
MAX5489
5
6
7
8
12 HB
11 WB
10 LB
9 N.C.
THIN QFN
3mm × 3mm
EXPOSED PAD CONNECTED TO GND.
________________________________________________________________ Maxim Integrated Products 1
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.