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參數(shù)資料
| 型號： | DS3903 |
| 元件分類： | 數(shù)字電位計 |
| 英文描述： | Triple 128-Position Nonvolatile Digital Potentiometer |
| 中文描述： | 三路、128抽頭、非易失數(shù)字電位器 |
| 文件頁數(shù)： | 11/11頁 |
| 文件大?。?/td> | 619K |
| 代理商： | DS3903 |
D
Triple 128-Position Nonvolatile
Digital Potentiometer
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
2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
the appropriate device address bit, and the read/write
bit, the slave device outputs an acknowledge signal on
the SDA line.
Applications Information
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.
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 V
CC
to write protect the potentiometer posi-
tions.
Wiper Resistance and Wiper Current Limit
Two substantial differences between digital poten-
tiometers and mechanical potentiometers are the wiper
resistance and the wiper current limit. The wiper resis-
tance (R
W
) is a result of the interconnecting materials
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 R
W
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.
The wiper current limit (I
W
) is also due to the intercon-
necting materials between the internal resistive ele-
ments and the wiper terminal. While it may be possible
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
and the voltage drop across the wiper resistance.
Using a Potentiometer as a
Variable Resistor
There are two ways to make a digital potentiometer into
a variable resistor. The first is to short the wiper terminal
to the high- or low-side terminal. This places wiper
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.
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 I
W
since there is no current load shar-
ing between the wiper resistance and the paralleled
resistive elements.
Both configurations are heavily influenced by the wiper
resistance, particularly over temperature, where its tem-
perature coefficient noticeably affects the resistor’s value.
Chip Information
TRANSISTOR COUNT: 10,793
SUBSTRATE CONNECTED TO GROUND
Package Information
For the latest package outline information, go to
www.maxim-ic.
com/packages
.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DS3903E | 功能描述:IC POT NV TRIPLE 128POS 20-TSSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:- 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 接片:32 電阻（歐姆）:50k 電路數(shù):1 溫度系數(shù):標準值 50 ppm/°C 存儲器類型:易失 接口:3 線串行（芯片選擇，遞增，增/減） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 細型，TSOT-23-6 供應商設備封裝:TSOT-23-6 包裝:帶卷 (TR) |
| DS3903E+ | 制造商:Maxim Integrated Products 功能描述:DGTL POTENTIOMETER 128POS 10.5KOHM/90KOHM TRIPLE 20TSSOP - Rail/Tube |
| DS3903E-020 | 功能描述:數(shù)字電位計 IC RoHS:否 制造商:Maxim Integrated 電阻:200 Ohms 溫度系數(shù):35 PPM / C 容差:25 % POT 數(shù)量:Dual 每 POT 分接頭:256 弧刷存儲器:Volatile 緩沖刷: 數(shù)字接口:Serial (3-Wire, SPI) 描述/功能:Dual Volatile Low Voltage Linear Taper Digital Potentiometer 工作電源電壓:1.7 V to 5.5 V 電源電流:27 uA 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:TQFN-16 封裝:Reel |
| DS3903E-020/R | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Triple 128-Position Nonvolatile Digital Potentiometer |
| DS3903E-020/T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Triple 128-Position Nonvolatile Digital Potentiometer |
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