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PDF DS3903 Data sheet ( Hoja de datos )
| Número de pieza | DS3903 | |
| Descripción | Triple 128-Position Nonvolatile Digital Potentiometer | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Rev 0; 6/02
Triple 128-Position Nonvolatile
Digital Potentiometer
General Description
The DS3903 contains three nonvolatile (NV) low tem-
perature coefficient digital potentiometers, which can
be accessed through a 2-wire bus. It operates in both
3V and 5V systems, and it features a write-protect pin
that can lock the positions of the potentiometers. An
address pin allows two DS3903s to be placed on the
same 2-wire bus.
Applications
Power-Supply Calibration
Mobile Phones and PDAs
Fiber Optics Transceiver Modules
Portable Electronics
A Small, Low-Cost Replacement for Mechanical
Potentiometers
Features
♦ Three 128-Position Linear Potentiometers
(Two 10kΩ, One 90kΩ)
♦ NV Wiper Storage
♦ 0 to 5.5V on Any Potentiometer Terminal
Independent of VCC
♦ Low End-to-End Temperature Coefficient
♦ Operates on an Industry-Standard 2-Wire Bus
♦ Write-Protect Pin
♦ Supply Voltage: 3V or 5V
♦ Operating Temperature Range: -40°C to +85°C
♦ Packaging: 20-Pin TSSOP
Ordering Information
PART
DataSheet4DUS.c3o90m3E-020
DS3903E-020/T&R
TEMP RANGE PIN-PACKAGE
-40°C to +85°C 20 TSSOP
-40°C to +85°C
20 TSSOP
(Tape-and-Reel)
DataShee
Pin Configuration
SDA 1
SCL 2
A0 3
WP 4
N.C. 5
L0 6
W1 7
L1 8
L2 9
GND 10
DS3903
20 VCC
19 N.C.
18 N.C.
17 N.C.
16 N.C.
15 H0
14 W0
13 H1
12 W2
11 H2
TSSOP
Typical Operating Circuit
0.1µF
2-WIRE
MASTER
VCC
DS3903
VCC
4.7kΩ 4.7kΩ
POTENTIOMETER 2
10kΩ
ADDDR FAh
SCL
SDA
POTENTIOMETER 0
10kΩ
WP ADDDR F9h
A0
POTENTIOMETER 1
90kΩ
ADDDR F8h
GND
VCC
5.1kΩ
Iref VARIABLE RESISTANCE
FOR ADJUSTABLE
CURRENT SOURCE
VCC
VREF1
HIGH-OUTPUT-IMPEDANCE
VOLTAGE REFERENCE
VCC
MAX427
VREF2
BUFFERED
VOLTAGE
REFERENCE
DataSheet4U.com
_____________________________________________ 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.
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1 page  
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Triple 128-Position Nonvolatile
Digital Potentiometer
Typical Operating Characteristics (continued)
(VCC = 5.0V, 10kΩ plots apply to both pot0 and pot2, TA = +25°C unless otherwise noted.)
et4U.com
WIPER RESISTANCE
vs. WIPER VOLTAGE (10kΩ)
350
300
250
200
150
100 VCC = 3V
POS 7Fh
50
0
012345
WIPER VOLTAGE (V)
VOLTAGE-DIVIDER PERCENT CHANGE
FROM 25°C vs. TEMPERATURE (10kΩ)
0.04
0.03 WIPER = 60h
0.02 Tc = 1.9ppm/°C
0.01
0
-0.01 WIPER = 40h
-0.02
Tc = 0.7ppm/°C
-0.03 Tc = 5.0ppm/°C
-0.04
-0.05 WIPER = 20h
-0.06
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
WIPER RESISTANCE
vs. WIPER VOLTAGE (90kΩ)
350
300
250
200
150
100 VCC = 3V
POS 7Fh
50
0
012345
WIPER VOLTAGE (V)
END-TO-END RESISTANCE PERCENT CHANGE
FROM 25°C vs. TEMPERATURE (10kΩ)
1.0
0.8
0.6 DataSheet4U.com
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
VOLTAGE-DIVIDER PERCENT CHANGE
FROM 25°C vs. TEMPERATURE (10kΩ)
0.12
0.10 WIPER = 20h
0.08 Tc = 18.0ppm/°C
0.06
0.04 WIPER = 60h
Tc = 3.7ppm/°C
0.02
WIPER = 40h
0
-0.02 Tc = 1.5ppm/°C
-0.04
-0.06
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
END-TO-END RESISTANCE PERCENT CHANGE
FROM 25°C vs. TEMPERATURE (90kΩ)
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80
TEMPERATURE (°C)
VOLTAGE-DIVIDER RELATIVE LINEARITY
vs. WIPER SETTING (10kΩ)
0.05
VOLTAGE-DIVIDER ABSOLUTE LINEARITY
vs. WIPER SETTING (10kΩ)
0.20
DataShee
0.04 0.16
0.03 0.12
0.02 0.08
0.01 0.04
0
0 20 40 60 80 100 120
WIPER SETTING
0
0 20 40 60 80 100 120
WIPER SETTING
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_____________________________________________________________________ 5
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Triple 128-Position Nonvolatile
Digital Potentiometer
et4U.com
the appropriate device address bit, and the read/write
Using a Potentiometer as a
bit, the slave device outputs an acknowledge signal on
Variable Resistor
the SDA line.
There are two ways to make a digital potentiometer into
Applications Information
a variable resistor. The first is to short the wiper terminal
to the high- or low-side terminal. This places wiper
Power-Supply Decoupling
To achieve the best results when using the DS3903,
decouple the power supply with a 0.01µF or 0.1µF
capacitor. Use a high-quality ceramic surface-mount
capacitor if possible. Surface-mount components mini-
mize lead inductance, which improves performance,
and ceramic capacitors tend to have adequate high-
frequency response for decoupling applications.
resistance in parallel with the resistance from the wiper
to the high or low side of the potentiometer. The advan-
tage of this method is that it reduces the current
through the wiper, which is advantageous if the current
is approaching the wiper current limit. The disadvan-
tage is that the wiper resistance makes the resistance
versus position nonlinear, particularly for low-resistance
values.
Write Protection
The write-protect pin has an internal pullup resistor. To
be able to adjust the potentiometers’ position, this pin
must be grounded. This pin can be left floating or con-
nected to VCC to write protect the potentiometer posi-
tions.
Wiper Resistance and Wiper Current Limit
Two substantial differences between digital poten-
The second way is to attach the wiper terminal, and
either the low- or high-side terminal. The unattached
terminal is connected to the wiper by the resistance
internal to the part, and stays at the same voltage as
the wiper. This method provides a linear resistance ver-
sus position function, but it limits the current through
the resistance to IW since there is no current load shar-
ing between the wiper resistance and the paralleled
resistive elements.
tiometers and mechanical potentiometers are the wiper Both configurations are heavily influenced by the wiper
resistance and the wiper
tance (RW) is a result of
cthuerreinntterlicmoint.nTehcetinwgipmearDtreearsitaaislSs- heet4rpeUesr.iascttouamrnecceo, epfaficrtiiecnutlanrolyticoevaebr lyteamffpeecrtasttuhree,rewshisetroer’sitsvatleume.-
on the IC between the internal resistive elements and
the wiper pin. This can be modelled by using an ideal
potentiometer, with a resistance of RW connected
between the ideal wiper and wiper terminal of the digi-
tal potentiometer. One final note about the wiper resis-
tance is that it has a high temperature coefficient
(approximately +3000PPM), which can be noticeable in
certain circuit configurations.
Chip Information
The wiper current limit (IW) is also due to the intercon-
necting materials between the internal resistive ele-
ments and the wiper terminal. While it may be possible
TRANSISTOR COUNT: 10,793
SUBSTRATE CONNECTED TO GROUND
to exceed this value for a short period without prob-
lems, exceeding the wiper current limit is a long-term
reliability problem.
Both characteristics can be minimized in designs by
connecting the wiper terminal to high-impedance
loads. This reduces both the current through the wiper
Package Information
For the latest package outline information, go to www.maxim-ic.
com/packages.
and the voltage drop across the wiper resistance.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
DataSheet4©U.2c0o0m2 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
DataSheet4 U .com
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| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet DS3903.PDF ] | |
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