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PDF MAX5487 Data sheet ( Hoja de datos )
| Número de pieza | MAX5487 | |
| Descripción | (MAX5487 - MAX5489) Linear-Taper Digital Potentiometers | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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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
VDD
GND
SCLK
DIN
CS
SPI
INTERFACE
8-BIT
LATCH
8 256
DECODER
16-BIT
NV RAM
POR
8-BIT
LATCH
8
256
DECODER
MAX5487
MAX5488
MAX5489
HA
WA
LA
HB
WB
LB
TOP VIEW
16 15 14 13
VDD 1
SCLK 2
DIN 3
CS 4
MAX5487
MAX5488
MAX5489
567 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.
1 page  
Dual, 256-Tap, Nonvolatile, SPI-Interface,
Linear-Taper Digital Potentiometers
(VDD = +5.0V, TA = +25°C, unless otherwise noted.)
Typical Operating Characteristics
SUPPLY CURRENT vs. TEMPERATURE
1.2
1.0
0.8
0.6 VCC = 5V
0.4
0.2
0
-40
VCC = 3V
-15 10 35 60
TEMPERATURE (°C)
85
TAP-TO-TAP SWITCHING TRANSIENT
(MAX5488)
MAX5487-89 toc04
VH_ = 5.0V
10,000
SUPPLY CURRENT
vs. DIGITAL INPUT VOLTAGE
1000
VCC = 5V
100
10
VCC = 3V
1
0
012345
DIGITAL INPUT VOLTAGE (V)
TAP-TO-TAP SWITCHING TRANSIENT
(MAX5489)
MAX5487-89 toc05
VH_ = 5.0V
WIPER RESISTANCE
vs. TAP POSITION (MAX5488)
400
300
200
100
0
0 32 64 96 128 160 192 224 256
TAP POSITION
WIPER TRANSIENT AT POWER-ON
MAX5487-89 toc06
VH_ = VDD
CS
2.0V/div
CS
2.0V/div
VDD
2.0V/div
WIPER
20mV/div
1.0µs/div
WIPER
20mV/div
1.0µs/div
WIPER
2.0V/div
2.0µs/div
_______________________________________________________________________________________ 5
5 Page 
Dual, 256-Tap, Nonvolatile, SPI-Interface,
Linear-Taper Digital Potentiometers
MAX5487
MAX5488
MAX5489
5V
H_
W_
L_
30V
MAX480
VOUT
Figure 4. Positive LCD-Bias Control Using a Voltage-Divider
5V
MAX5487
MAX5488
MAX5489
H_
L_
W_
30V
MAX480
VOUT
Figure 5. Positive LCD-Bias Control Using a Variable Resistor
Use the following equations to calculate the gain (A)
and the -3dB cutoff frequency (fC):
A = 1 + R1
R2
fC
=
2π
×
1
R3
×
C
Adjustable Voltage Reference
Figure 7 shows the MAX5487/MAX5488/MAX5489 used
as the feedback resistors in multiple adjustable volt-
age-reference applications. Independently adjust the
output voltages of the MAX6160s from 1.23V to VIN -
0.2V by changing the wiper positions of the MAX5487/
MAX5488/MAX5489.
Offset Voltage and Gain Adjustment
Connect the high and low terminals of one potentiome-
ter of a MAX5487/MAX5488/MAX5489 to the NULL
inputs of a MAX410, and connect the wiper to the op
amp’s positive supply to nullify the offset voltage over
the operating temperature range. Install the other
potentiometer in the feedback path to adjust the gain of
the MAX410 (see Figure 8).
Chip Information
TRANSISTOR COUNT: 12,177
PROCESS: BiCMOS
VIN
HA
WA
LA
R3
C
V+
MAX410
VOUT
1/2 MAX5487
1/2 MAX5488
1/2 MAX5489
R2, R3 = RHL x D / 256
WHERE RHL = END-TO-END RESISTANCE
AND D = DECIMAL VALUE OF WIPER CODE
1/2 MAX5487
1/2 MAX5488
1/2 MAX5489
V-
R1
HB
R2 WB
LB
Figure 6. Programmable Filter
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MAX5487.PDF ] | |
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