Rainbow Electronics MAX5489 - Manual

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 10k Ω,
while the MAX5488 and MAX5489 have resistances of
50k
Ω 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
♦ Wiper Position Stored in Nonvolatile Memory
(EEPROM) and Recalled Upon Power-Up or
Recalled by an Interface Command
♦ 3mm x 3mm x 0.8mm Thin QFN Package
♦ ±1 LSB INL, ±0.5 LSB DNL (Voltage-Divider Mode)
♦ 256 Tap Positions
♦ 35ppm/°C End-to-End Resistance Temperature
Coefficient
♦ 5ppm/°C Ratiometric Temperature Coefficient
♦ 10kΩ, 50kΩ, and 100kΩ End-to-End Resistance
Values
♦ SPI-Compatible Serial Interface
♦ Reliability
200,000 Wiper Store Cycles
50-Year Wiper Data Retention
♦ +2.7V to +5.25V Single-Supply Operation
MAX5487/MAX5488/MAX5489
Dual, 256-Tap, Nonvolatile, SPI-Interface,
Linear-Taper Digital Potentiometers
________________________________________________________________ Maxim Integrated Products 1
19-3478; Rev 1; 1/05
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.
SPI is a trademark of Motorola, Inc.
Ordering Information/Selector Guide
PART TEMP RANGE PIN-PACKAGE
END-TO-END
RESISTANCE (k Ω)
TOP MARK
MAX5487ETE* -40 °C to +85°C 16 Thin QFN-EP** 10 ABR
MAX5488ETE -40 °C to +85°C 16 Thin QFN-EP** 50 ABS
MAX5489ETE -40 °C to +85°C 16 Thin QFN-EP** 100 ABT
*Future product—contact factory for availability.
**EP = Exposed pad.
MAX5487
MAX5488
MAX5489
POR
8-BIT
LATCH
16-BIT
NV RAM
SCLK
DIN
CS
DECODER
8
8
256
DECODER
256
HA
WA
LA
HB
WB
LB
V DD
GND
SPI
INTERFACE
8-BIT
LATCH
Functional Diagram
16
1
2
3
4
12
11
10
9
15 14 13
5 6 7 8
N.C. HA WA LA
HB
WB
LB
N.C.
SCLK
DIN
N.C. N.C. GND N.C.
V DD
TOP VIEW
EXPOSED PAD CONNECTED TO GND.
MAX5487
MAX5488
MAX5489
CS
THIN QFN
3mm × 3mm
Pin Configuration