Datasheet > AD5282BRU200

AD5282BRU200

更新时间： 2024-01-18 08:22:48

品牌	Logo	应用领域
亚德诺 - ADI		电位器
页数	文件大小	规格书
10页	154K
描述
+15V, I2C Compatible Digital Potentiometers

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技术参数
数据手册

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AD5282BRU200 技术参数

Source Url Status Check Date：	2013-05-01 14:56:11.544	是否无铅：	含铅
是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	TSSOP	包装说明：	MO-153AB, TSSOP-16
针数：	16	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.48	其他特性：	CAN ALSO OPERATE FROM A SINGLE +5V TO +15V SUPPLY; ALSO REQUIRES A +2.7V TO +5.5V LOGIC SUPPLY
标称带宽：	0.035 kHz	控制接口：	2-WIRE SERIAL
转换器类型：	DIGITAL POTENTIOMETER	JESD-30 代码：	R-PDSO-G16
JESD-609代码：	e0	长度：	5 mm
湿度敏感等级：	1	标称负供电电压：	-5 V
功能数量：	2	位置数：	256
端子数量：	16	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装等效代码：	TSSOP16,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	240	电源：	5/15/+-5 V
认证状态：	Not Qualified	电阻定律：	LINEAR
最大电阻容差：	30%	最大电阻器端电压：	5 V
最小电阻器端电压：	-5 V	座面最大高度：	1.2 mm
子类别：	Digital Potentiometers	标称供电电压：	5 V
表面贴装：	YES	标称温度系数：	30 ppm/ °C
温度等级：	INDUSTRIAL	端子面层：	Tin/Lead (Sn85Pb15)
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
标称总电阻：	200000 Ω	宽度：	4.4 mm

AD5282BRU200 数据手册

PRELIMINARY TECHNICAL DATA

AD5280/AD5282

SCL

AD1

AD0

R/W

SDA

NO ACK.

BY MASTER

ACK. BY

AD5280

START BY

MASTER

FRAME 2

STOP BY

MASTER

FRAME 1

Slave Address Byte

Data From Select ed

RDAC Register

Figure 3. Reading Data from a Previously Selected RDAC Register

for data 02_Hand so on. Each LSB data value increase moves the

OPERATION

The AD5280/AD5282 provides a single/dual channel, 256-

position digitally-controlled variable resistor (VR) device. The

terms VR and RDAC are used interchangeably throughout this

documentation. To program the VR settings, refer to the Digital

Interface section. Both parts have an internal power ON preset

that places the wiper in mid scale during power on, which

simplifies the fault condition recovery at power up. In addition,

the shutdown SHDN pin of AD5280/AD5282 places the RDAC

in a zero power consumption state where terminal A is open

circuited and the wiper W is connected to terminal B, resulting

in only leakage currents being consumed in the VR structure. In

shutdown mode the VR latch settings are maintained, so that,

returning to operational mode from power shutdown, the VR

settings return to their previous resistance values.

wiper up the resistor ladder until the last tap point is reached at

19982Ω [R_AB–1LSB+R_W]. The wiper does not directly connect

to the B terminal. See Figure 4 for a simplified diagram of the

equivalent RDAC circuit.

The general equation determining the digitally programmed

output resistance between W and B is:

R_WB(D) =

R_AB+R_W

eqn.1

256

where D is the decimal equivalent of the binary code which is

loaded in the 8-bit RDAC register, and R_ABis the nominal end-

to-end resistance.

SHDN

For example, R_AB=20KΩ, when V_B= 0V and A–terminal is open

circuit, the following output resistance values R_WBwill be set for

the following RDAC latch codes. Result will be the same if

terminal A is tied to W:

R_WB

Output State

(DEC) (Ω)

256

128

19982Ω Full-Scale (R_AB- 1LSB + R_W)

10060Ω Mid-Scale

RDAC

LATCH

DECODER

138Ω

60Ω

1 LSB

Zero-Scale (Wiper contact resistance)

Note that in the zero-scale condition a finite wiper resistance of

60Ω is present. Care should be taken to limit the current flow

between W and B in this state to a maximum current of no more

than 5mA. Otherwise, degradation or possible destruction of the

internal switch contact can occur.

Figure 4. AD5280/AD5282 Equivalent RDAC Circuit

PROGRAMMING THE VARIABLE RESISTOR

Rheostat Operation

The nominal resistance of the RDAC between terminals A and B

are available in 20KΩ, 50KΩ, and 200KΩ. The final three

digits of the part number determine the nominal resistance

value, e.g. 20KΩ = 20; 50KΩ = 50; 200KΩ = 200. The

nominal resistance (R_AB) of the VR has 256 contact points

Similar to the mechanical potentiometer, the resistance of the

RDAC between the wiper W and terminal A also produces a

digitally controlled resistance R_WA. When these terminals are

used the B–terminal should be let open or tied to the wiper

terminal. Setting the resistance value for R_WAstarts at a

accessed by the wiper terminal, plus the B terminal contact. The

eight bit data in the RDAC latch is decoded to select one of the

256 possible settings. Assume a 20KΩ part is used, the wiper's

first connection starts at the B terminal for data 00_H. Since there

maximum value of resistance and decreases as the data loaded in

the latch is increased in value. The general equation for this

operation is:

is a 60Ω wiper contact resistance, such connection yields a

minimum of 60Ω resistance between terminals W and B. The

second connection is the first tap point corresponds to 138Ω

(R_WB= R_AB/256 + R_W= 78Ω+60Ω) for data 01_H. The third

256 − D

R_WA(D) =

R_AB+ R_W

eqn.2

256

connection is the next tap point representing 216Ω (78x2+60)

REV PrE 12 MAR 02

Information contained in this Product Concept Data Sheet describes a product in the early definition stage. There is no guarantee that the information contained here will become a final

product in its present form. For latest information contact Walt Heinzer/Analog Devices, Santa Clara, CA. TEL 408 382-3107; FAX 408 382-2721; email; walt.heinzer@analog.com

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与AD5282BRU200相关器件

型号	品牌	描述	获取价格	数据表
AD5282BRU200-REEL7	ADI	Single/Dual,15 V/5 V,256-Position I2C-Compatible Digital Potentiometer	获取价格
AD5282BRU20-REEL7	ADI	Single/Dual,15 V/5 V,256-Position I2C-Compatible Digital Potentiometer	获取价格
AD5282BRU50	ADI	+15V, I2C Compatible Digital Potentiometers	获取价格
AD5282BRU50	ROCHESTER	DUAL 50K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO16, MO	获取价格
AD5282BRU50-REEL7	ADI	Single/Dual,15 V/5 V,256-Position I2C-Compatible Digital Potentiometer	获取价格
AD5282BRU50-REEL7	ROCHESTER	DUAL 50K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 256 POSITIONS, PDSO16, MO	获取价格

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