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參數(shù)資料
| 型號(hào)： | X9C503 |
| 元件分類： | 數(shù)字電位計(jì) |
| 英文描述： | EEPOT Nonvolatile Digital Potentiometer(100個(gè)抽頭,-5V~+5V,50K總電阻,非易失性數(shù)字電位器) |
| 中文描述： | EEPOT非易失數(shù)字電位器（100個(gè)抽頭，- 5V的?5V的，50K的總電阻，非易失性數(shù)字電位器） |
| 文件頁數(shù)： | 1/8頁 |
| 文件大小： | 87K |
| 代理商： | X9C503 |
Application Note
AN120-1
AN120
Figure 1. Digitally-Controlled Potentiometer
XDCP
is a trademark of Xicor, Inc.
For the most part, the universe of feedback system
design separates neatly into two fundamental design
paradigms: analog-based designs and digital-based
designs. Both design strategies are characterized by
advantages and liabilities that generally make one or the
other a clearly superior choice for any given application.
Pure analog designs, for example, tend to display design
simplicity and low development costs that play well in the
context of smaller system applications. Digital-based
designs, by contrast, have essentially unlimited flexibility
in computation of the feedback function and therefore
dominate in more complex feedback applications in
which higher development costs (generally including
software implementation) can be justified. Sometimes, a
feature of particular utility in digital designs is the
availability of digital memory with its ability to store
feedback parameters for arbitrary lengths of time without
drift. This makes possible a variety of system solutions
including multiple system operating modes in which
feedback values can be acquired in some modes and
then applied in others.
But what about feedback systems that lie in between
these clear opposites What about, for example, relatively
simple cost-sensitive applications that yet would benefit
from functions that are difficult to implement in analog
circuits and which therefore require digital techniques
A basis for a useful middle ground between the extremes
of pure analog or pure digital feedback designs is offered
by an inexpensive component: the Xicor 3-wire digitally
controlled potentiometer. Figure 1 illustrates the
architecture of the 3-wire XDCP The 3-wire XDCP is
seen to comprise a digital input and an analog output
interface. The 3-wire XDCP digital input interface
consists of a bidirectional counter controlled by direction
(U/D), clock (INC) inputs, and chip select/EEPROM-store
(CS) logic signals. The XDCP analog output interface
consists of the digitally controlled variable resistance/
potentiometer element.
A generalized basic conceptual topology representative
of feedback control systems based on the 3-wire XDCP is
illustrated in Figure 2. It comprises six design elements:
A. The XDCP Error Integrator. During the feedback
process, the XDCP closes the feedback loop by
accumulating in its up/down control counter successive
samples of the system state.
B. Clocking Oscillator. The oscillator controls the rate of
feedback sampling. Selection of the oscillator period must
therefore be based on consideration of both the minimum
response time of the XDCP (< 500μs for typical Xicor
parts) and of the rest of the feedback system as
determined by such factors as the gain-bandwidth
products of the op amp and comparator. Appropriate
oscillator periods will typically lie in the range of 1 to
100 milliseconds.
Application of Xicor Digitally Controlled Potentiometers (XDCP
as Hybrid Analog/Digital Feedback System Control Elements
W. S. Woodward, January 1999
)
Control
and
Memory
Up/Down
(U/D)
Increment
(INC)
Device Select
(CS)
V
CC
(Supply Voltage)
VSS (Ground)
V
H
/R
H
V
W
/R
W
V
L
/R
L
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| X9C503P | 功能描述:IC DIGITAL POT 50K 100TP 8DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:XDCP™ 標(biāo)準(zhǔn)包裝:2,500 系列:XDCP™ 接片:256 電阻（歐姆）:100k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 ±300 ppm/°C 存儲(chǔ)器類型:非易失 接口:I²C（設(shè)備位址） 電源電壓:2.7 V ~ 5.5 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) |
| X9C503PI | 功能描述:IC DIGITAL POT 50K 100TP 8DIP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 數(shù)字電位器 系列:XDCP™ 標(biāo)準(zhǔn)包裝:2,500 系列:XDCP™ 接片:256 電阻（歐姆）:100k 電路數(shù):1 溫度系數(shù):標(biāo)準(zhǔn)值 ±300 ppm/°C 存儲(chǔ)器類型:非易失 接口:I²C（設(shè)備位址） 電源電壓:2.7 V ~ 5.5 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) |
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