Datasheet > AD5220BRMZ10

AD5220BRMZ10

更新时间： 2024-01-22 17:21:09

品牌	Logo	应用领域
罗彻斯特 - ROCHESTER		光电二极管转换器电阻器
页数	文件大小	规格书
12页	1394K
描述
10K DIGITAL POTENTIOMETER, INCREMENT/DECREMENT CONTROL INTERFACE, 128 POSITIONS, PDSO8, ROHS COMPLIANT, MO-187AA, MSOP-8

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AD5220BRMZ10 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	TSSOP
包装说明：	TSSOP, TSSOP8,.19	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	1.63
Samacsys Confidence：	3	Samacsys Status：	Released
Samacsys PartID：	154413	Samacsys Pin Count：	8
Samacsys Part Category：	Integrated Circuit	Samacsys Package Category：	Small Outline Packages
Samacsys Footprint Name：	AD5220BRMZ10	Samacsys Released Date：	2015-04-16 09:48:08
Is Samacsys：	N	其他特性：	ALSO OPERATES AT 5V SUPPLY
标称带宽：	0.65 kHz	控制接口：	INCREMENT/DECREMENT
转换器类型：	DIGITAL POTENTIOMETER	JESD-30 代码：	S-PDSO-G8
JESD-609代码：	e3	长度：	3 mm
湿度敏感等级：	1	功能数量：	1
位置数：	128	端子数量：	8
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：	TSSOP8,.19	封装形状：	SQUARE
封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH	峰值回流温度（摄氏度）：	260
电源：	3/5 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：	5.5 V	最小电阻器端电压：
座面最大高度：	1.1 mm	子类别：	Digital Potentiometers
标称供电电压：	3 V	表面贴装：	YES
技术：	CMOS	标称温度系数：	800 ppm/ °C
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn)
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：	40
标称总电阻：	10000 Ω	宽度：	3 mm
Base Number Matches：	1

AD5220BRMZ10 数据手册

AD5220

OPERATION

The AD5220 provides a 128-position digitally controlled vari-

able resistor (VR) device. Changing the VR settings is accom-

plished by pulsing the CLK pin while CS is active low. The

direction of the increment is controlled by the U/D (UP/DOWN)

control input pin. When the wiper hits the end of the resistor

(Terminals A or B) additional CLK pulses no longer change

the wiper setting. The wiper position is immediately decoded

by the wiper decode logic changing the wiper resistance. Ap-

propriate debounce circuitry is required when push button

switches are used to control the count sequence and direction

of count. The exact timing requirements are shown in Figure 3.

The AD5220 powers ON in a centered wiper position exhibit-

RDAC

UP/DOWN

CNTR

DECODE

ing nearly equal resistances of R_WAand R_WB

= R

/128

NOMINAL

Figure 38. AD5220 Equivalent RDAC Circuit

CLK

PROGRAMMING THE VARIABLE RESISTOR

UP/

DOWN

CNTR

Rheostat Operation

The nominal resistance of the RDAC between terminals A and

B is available with values of 10 kΩ, 50 kΩ, and 100 kΩ. The

final three characters of the part number determine the nominal

resistance value, e.g., 10 kΩ =10; 50 kΩ = 50; 100 kΩ = 100.

The nominal resistance (R_AB) of the VR has 128 contact points

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

power ON the resistance from the wiper to either end Terminal

A or B is approximately equal. Clocking the CLK pin will in-

crease the resistance from the Wiper W to Terminal B by one

unit of R_Sresistance (see Figure 38). The resistance R_WBis

determined by the number of pulses applied to the clock pin.

Each segment of the internal resistor string has a nominal resis-

tance value of R_S= R_AB/128, which becomes 78 Ω in the case of

the 10 kΩ AD5220BN10 product. Care should be taken to limit

the current flow between W and B in the direct contact state to

a maximum value of 5 mA to avoid degradation or possible de-

struction of the internal switch contact.

U/D

GND

POR

AD5220

Figure 35. Block Diagram

DIGITAL INTERFACING OPERATION

The AD5220 contains a three-wire serial input interface. The

three inputs are clock (CLK), CS and UP/DOWN (U/D). The

negative-edge sensitive CLK input requires clean transitions to

avoid clocking multiple pulses into the internal UP/DOWN

counter register, see Figure 35. Standard logic families work

well. If mechanical switches are used for product evaluation

they should be debounced by a flip-flop or other suitable

means. When CS is taken active low the clock begins to incre-

ment or decrement the internal UP/DOWN counter dependent

upon the state of the U/D control pin. The UP/DOWN counter

value (D) starts at 40_Hat system power ON. Each new CLK

pulse will increment the value of the internal counter by one

LSB until the full scale value of 3F_His reached as long as the

U/D pin is logic high. If the U/D pin is taken to logic low the

counter will count down stopping at code 00_H(zero-scale).

Additional clock pulses on the CLK pin are ignored when the

wiper is at either the 00_Hposition or the 3F_Hposition.

Like the mechanical potentiometer the RDAC replaces, it is

totally symmetrical (see Figure 38). The resistance 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 tied to the wiper.

The typical part-to-part distribution of R_BAis process lot depen-

dent having a ±30% variation. The change in R_BAwith tempera-

ture has a 800 ppm/°C temperature coefficient.

All digital inputs (CS, U/D, CLK) are protected with a series

input resistor and parallel Zener ESD structure shown in

Figure 36.

The R_BAtemperature coefficient increases as the wiper is pro-

grammed near the B-terminal due to the larger percentage con-

tribution of the wiper contact switch resistance, which has a

0.5%/°C temperature coefficient. Figure 14 shows the effect of

the wiper contact resistance as a function of code setting. An-

other performance factor influenced by the switch contact resis-

tance is the relative linearity error performance between the

10 kΩ, and the 50 kΩ or 100 kΩ versions. The same switch

contact resistance is used in all three versions. Thus the perfor-

mance of the 50 kΩ and 100 kΩ devices which have the least

impact on wiper switch resistance exhibits the best linearity

error, see Figures 7 and 8.

1k⍀

LOGIC

Figure 36. Equivalent ESD Protection Digital Pins

20⍀

A, B, W

GND

Figure 37. Equivalent ESD Protection Analog Pins

–8–

REV.

1...6 7 8910 11 12

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与AD5220BRMZ10相关器件

型号	品牌	获取价格	描述	数据表
AD5220BRMZ100	ADI	获取价格	Increment/Decrement Digital Potentiometer
AD5220BRMZ100	ROCHESTER	获取价格	100K DIGITAL POTENTIOMETER, INCREMENT/DECREMENT CONTROL INTERFACE, 128 POSITIONS, PDSO8, R
AD5220BRMZ100-R7	ADI	获取价格	Increment/Decrement Digital Potentiometer
AD5220BRMZ10-REEL7	ADI	获取价格	Increment/Decrement Digital Potentiometer
AD5220BRMZ50	ADI	获取价格	Increment/Decrement Digital Potentiometer
AD5220BRMZ50	ROCHESTER	获取价格	50K DIGITAL POTENTIOMETER, INCREMENT/DECREMENT CONTROL INTERFACE, 128 POSITIONS, PDSO8, RO
AD5220BRMZ50-RL7	ADI	获取价格	Increment/Decrement Digital Potentiometer
AD5220BRMZ50-RL7	ROCHESTER	获取价格	50K DIGITAL POTENTIOMETER, INCREMENT/DECREMENT CONTROL INTERFACE, 128 POSITIONS, PDSO8, RO
AD5220BRZ10	ADI	获取价格	Increment/Decrement Digital Potentiometer
AD5220BRZ100	ADI	获取价格	Increment/Decrement Digital Potentiometer

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