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AD5247BKS5-R2 PDF预览

AD5247BKS5-R2

更新时间： 2024-01-03 01:42:09
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
21页 2544K
描述
5K DIGITAL POTENTIOMETER, 2-WIRE SERIAL CONTROL INTERFACE, 128 POSITIONS, PDSO6, MO-203AB, SC-70, 6 PIN

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AD5247BKS5-R2 技术参数

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：TSSOP, TSSOP6,.08针数：6
Reach Compliance Code：not_compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.63
其他特性：IT CAN ALSO OPERATE FROM A 5V NOMINAL SUPPLY标称带宽：1.2 kHz
控制接口：2-WIRE SERIAL转换器类型：DIGITAL POTENTIOMETER
JESD-30 代码：R-PDSO-G6JESD-609代码：e0
长度：2 mm湿度敏感等级：1
功能数量：1位置数：128
端子数量：6最高工作温度：125 °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：TSSOP6,.08
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：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：3 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标称温度系数：45 ppm/ °C
温度等级：AUTOMOTIVE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：5000 Ω宽度：1.25 mm
Base Number Matches：1

AD5247BKS5-R2 数据手册

 浏览型号AD5247BKS5-R2的Datasheet PDF文件第12页浏览型号AD5247BKS5-R2的Datasheet PDF文件第13页浏览型号AD5247BKS5-R2的Datasheet PDF文件第14页浏览型号AD5247BKS5-R2的Datasheet PDF文件第16页浏览型号AD5247BKS5-R2的Datasheet PDF文件第17页浏览型号AD5247BKS5-R2的Datasheet PDF文件第18页 
AD5247  
THEORY OF OPERATION  
The AD5247 is a 128-position, digitally-controlled variable  
resistor (VR) device. An internal power-on preset places the  
wiper at midscale during power-on, which simplifies the  
default condition recovery at power-up.  
The general equation determining the digitally programmed  
output resistance between W and B is  
D
RWB(D) =  
×RAB +2×RW  
(1)  
128  
PROGRAMMING THE VARIABLE RESISTOR  
where:  
Rheostat Operation  
D is the decimal equivalent of the binary code loaded in the  
The nominal resistance (RAB) of the RDAC between Terminal A  
and Terminal B is available in 5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ.  
The final two or three digits of the part number determine the  
nominal resistance value; for example, 10 kΩ = 10 and 50 kΩ =  
50. The RAB of the VR has 128 contact points accessed by the  
wiper terminal, plus the B terminal contact. The 7-bit data in  
the RDAC latch is decoded to select one of the 128 possible  
settings.  
7-bit RDAC register.  
R
AB is the end-to-end resistance.  
R
W is the wiper resistance contributed by the on resistance of  
the internal switch.  
In summary, if RAB = 10 kΩ and the Terminal A is open-circuited,  
the output resistance RWB, shown in Table 9, is set for the indicated  
RDAC latch codes.  
Table 9. Codes and Corresponding RWB Resistance  
Assuming a 10 kΩ part is used, the wiper’s first connection starts  
at the B terminal for Data 0x00. Because there is a 50 Ω wiper  
contact resistance, such a connection yields a minimum of 100 Ω  
(2 × 50 Ω) resistance between Terminal W and Terminal B. The  
second connection is the first tap point, corresponding to 178 Ω  
(RWB = RAB/128 + RW = 78 Ω + 2 × 50 Ω) for Data 0x01. The third  
connection is the next tap point, representing 256 Ω (2 × 78 Ω  
+ 2 × 50 Ω) for Data 0x02, and so on. Each LSB data value increase  
moves the wiper up the resistor ladder until the last tap point is  
reached at 10,100 Ω (RAB + 2 × RW).  
D (Decimal)  
RWB (Ω)  
10,100  
5100  
1ꢀ8  
Output State  
12ꢀ  
64  
1
Full scale (RAB + 2 × RW)  
Midscale  
1 LSB  
0
100  
Zero scale (wiper contact resistance)  
Note that in the zero-scale condition, a finite resistance of  
100 Ω between Terminal W and Terminal B is present. Care  
should be taken to limit the current flow between W and B in  
this state to a maximum pulse current of no more than 20 mA.  
Otherwise, degradation or possible destruction of the internal  
switch contact can occur.  
Figure 35 shows a simplified diagram of the equivalent RDAC  
circuit where the last resistor string is not accessed.  
Ax  
Similar to the mechanical potentiometer, the resistance of  
the RDAC between Wiper W and Terminal A also produces a  
digitally controlled complementary resistance, RWA. When  
these terminals are used, the Terminal B can be opened. Set the  
resistance value for RWA to start at a maximum value of resistance  
and to decrease the data loaded in the latch increases in value.  
The general equation for this operation is  
R
R
D6  
D5  
D4  
D3  
D2  
D1  
D0  
S
S
Wx  
Bx  
128 − D  
128  
RWA(D) =  
× RAB + 2×RW  
(2)  
RDAC  
LATCH  
AND  
DECODER  
R
If RAB = 10 kΩ and the B terminal is open-circuited, the output  
resistance, RWA, shown in Table 10, is set for the indicated RDAC  
latch codes.  
S
Table 10. Codes and Corresponding RWA Resistance  
Figure 35. AD5247 Equivalent RDAC Circuit  
D (Decimal)  
RWA (Ω)  
Output State  
Full scale  
Midscale  
1 LSB  
12ꢀ  
64  
1
1ꢀ8  
5100  
9961  
0
10,100  
Zero scale  
Rev. B | Page 14 of 20  
 
 
 
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