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AD5235BRU25 PDF预览

AD5235BRU25

更新时间： 2024-01-08 21:29:23
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 104K
描述
Nonvolatile Memory, Dual 1024 Position Digital Potentiometers

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AD5235BRU25 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, TSSOP16,.25针数：16
Reach Compliance Code：not_compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.47
Samacsys Description：1024-Position Digital Potentiometer其他特性：LINEAR OR LOG TAPER SETTINGS; NONVOLATILE MEMORY; CAN ALSO OPERATE FROM +/-2.25V TO +/-2.75V SUPPLY
标称带宽：0.125 kHz控制接口：3-WIRE SERIAL
转换器类型：DIGITAL POTENTIOMETERJESD-30 代码：R-PDSO-G16
JESD-609代码：e0长度：5 mm
湿度敏感等级：1功能数量：2
位置数：1024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：+-2.5/3/5 V认证状态：Not Qualified
电阻定律：LOGARITHMIC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：
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：35 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：25000 Ω
宽度：4.4 mm

AD5235BRU25 数据手册

 浏览型号AD5235BRU25的Datasheet PDF文件第4页浏览型号AD5235BRU25的Datasheet PDF文件第5页浏览型号AD5235BRU25的Datasheet PDF文件第6页浏览型号AD5235BRU25的Datasheet PDF文件第8页浏览型号AD5235BRU25的Datasheet PDF文件第9页浏览型号AD5235BRU25的Datasheet PDF文件第10页 
PRELIMINARY TECHNICAL DATA  
Nonvolatile Memory Digital Potentiometers  
AD5235  
ladder until the last tap point is reached at RWB=25025Ω. See figure  
Detail Potentiometer Operation  
3 for a simplified diagram of the equivalent RDAC circuit.  
The actual structure of the RDAC is designed to emulate the  
performance of a mechanical potentiometer. The RDAC contains a  
string of connected resistor segments, with an array of analog  
switches that act as the wiper connection to several points along the  
resistor array. The number of points is the resolution of the device.  
The AD5235 has 1024 connection points allowing it to provide  
better than 0.5% set-ability resolution. Figure 3 provides an  
equivalent diagram of the connections between the three terminals  
that make up one channel of the RDAC. The SWA and SWB will  
always be ON while one of the switches SW(0) to SW(2N-1) will  
be ON one at a time depends upon the resistance step decoded from  
the Data Bits. Note that there are two 50Ω wiper resistances, RW.  
The resistance contributed by RW must be accounted for when  
calculating the output resistance. RW is the sum of the resistances of  
SWA + SWX and SWB + SWX for A-to-Wiper and B-to-Wiper  
respectively.  
The general equation, which determines the digitally programmed  
output resistance between Wx and Bx, is:  
RWB(Dx) = (Dx/2N) * RAB + RW  
eqn. 1  
Where N is the resolution of the VR, Dx is the data contained in  
the RDACx latch, and RAB is the nominal end-to-end resistance.  
Since N=10 and RW=50Ω for AD5235, eqn. 1 becomes:  
RWB(Dx) = (Dx/1024) * RAB + 50Ω  
eqn. 2  
For example, when VB = 0V and A–terminal is open circuit the  
following output resistance values will be set for the following  
RDAC latch codes (applies to RAB=25KΩ potentiometers):  
SWA  
AX  
Dx  
RWB  
Output State  
(DEC) (Ω)  
SW(2 N-1)  
RDAC  
1023  
512  
1
25025Ω Full-Scale  
12500Ω Mid-Scale  
WX  
WIPER  
REGISTER  
&
RS  
SW(2 N-2)  
74Ω  
50Ω  
1 LSB  
0
Zero-Scale (Wiper contact resistance)  
DECODER  
Note that in the zero-scale condition a finite wiper resistance of  
50Ω is present. Care should be taken to limit the current flow  
between W and B in this state to no more than 20mA to avoid  
degradation or possible destruction of the internal switch contact.  
RS  
RS  
SW(1 )  
SW(0 )  
SWB  
RS = RAB /2N  
DIGITAL  
CIRCUITRY  
OMITTED FOR  
CLARITY  
BX  
Figure 3. Equivalent RDAC structure  
PROGRAMMING THE VARIABLE RESISTOR  
Rheostat Operation  
The nominal resistance of the RDAC between terminals A and B  
are available with values of 25KΩ, and 250KΩ. The final digits of  
the part number determine the nominal resistance value, e.g., 25KΩ  
= 25; 250KΩ = 250. The nominal resistance (RAB) of the AD5235  
Figure 4. Symmetrical RDAC Operation  
VR has 1024 contact points accessed by the wiper terminal, plus  
the B terminal contact. The 10-bit data word in the RDAC latch is  
decoded to select one of the 1024 possible settings. The wiper's  
first connection starts at the B terminal for data 00H. This B–  
Like the mechanical potentiometer the RDAC replaces, the  
AD5235 part is totally symmetrical. The resistance between the  
wiper W and terminal A also produces a digitally controlled  
resistance RWA. Figure 4 shows the symmetrical programmability  
terminal connection has a wiper contact resistance, RW of 50Ω,  
regardless of what the nominal resistance RAB is. The second  
connection (25KΩ part) is the first tap point where RWB =74Ω [RWB  
=RAB/1024 + RW = 24Ω+50Ω)] for data 01H. The third connection  
of the various terminal connections. When these terminals are used,  
the B–terminal should be tied to the wiper. Setting the resistance  
value for RWA starts at a 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 the next tap point representing RWB =49+50=99Ω for data 02H.  
Each LSB data value increase moves the wiper up the resistor  
REV PrD 6 NOV, 2000  
7
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)562-7254; FAX (408)727-1550; walt.heinzer@analog.com  
1...45678910

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