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AD5260BRU50 PDF预览

AD5260BRU50

更新时间： 2024-01-04 00:53:26
品牌 Logo 应用领域
亚德诺 - ADI 电位器
页数 文件大小 规格书
20页 841K
描述
1-/2-Channel 15 V Digital Potentiometers

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中文翻译

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AD5260BRU50 技术参数

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-14
针数：14Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.35其他特性：IT CAN ALSO OPERATE FROM A SINGLE 4.5V TO 16.5V SUPPLY; ALSO REQUIRES A +2.7V TO +5.5V LOGIC SUPPLY
标称带宽：0.13 kHz控制接口：3-WIRE SERIAL
转换器类型：DIGITAL POTENTIOMETERJESD-30 代码：R-PDSO-G14
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：1位置数：256
端子数量：14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：TSSOP14,.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：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：50000 Ω宽度：4.4 mm
Base Number Matches：1

AD5260BRU50 数据手册

 浏览型号AD5260BRU50的Datasheet PDF文件第11页浏览型号AD5260BRU50的Datasheet PDF文件第12页浏览型号AD5260BRU50的Datasheet PDF文件第13页浏览型号AD5260BRU50的Datasheet PDF文件第15页浏览型号AD5260BRU50的Datasheet PDF文件第16页浏览型号AD5260BRU50的Datasheet PDF文件第17页 
AD5260/AD5262  
TEST CIRCUITS (continued)  
+5.0V  
؎5V p-p  
SS  
CS  
V
V
V
DD  
DD  
LOGIC  
I
␮C  
CLK  
SDI  
SCLK  
MOSI  
LOGIC  
؎2.5V p-p  
D = 80  
GND  
CS  
CLK  
SDI  
H
GND  
V
SS  
–5.0V  
DIGITAL INPUT  
VOLTAGE  
Figure 13. Bipolar Operation from Dual Supplies  
Gain Control Compensation  
Digital potentiometers are commonly used in gain control as in  
the noninverting gain amplifier shown in Figure 14.  
Test Circuit 8. VLOGIC Current vs. Digital Input Voltage  
NC  
C2  
4.7pF  
I
V
A
B
CM  
DD  
W
DUT  
R2  
V
GND  
SS  
200k⍀  
B
V
CM  
A
R1  
W
NC  
47k⍀  
C1  
25pF  
Test Circuit 9. Analog Crosstalk  
V
O
U1  
V
i
Figure 14. Typical Noninverting Gain Amplifier  
Notice that when the RDAC B terminal parasitic capacitance is  
connected to the op amp noninverting node, it introduces a zero  
for the 1/bO term with +20 dB/dec, whereas a typical op amp GBP  
has –20 dB/dec characteristics. A large R2 and finite C1 can cause  
this Zero’s frequency to fall well below the crossover frequency.  
Hence the rate of closure becomes 40 dB/dec and the system has  
0∞ phase margin at the crossover frequency. The output may ring  
or oscillate if the input is a rectangular pulse or step function.  
Similarly, it is also likely to ring when switching between two  
gain values because this is equivalent to a step change at the input.  
PROGRAMMING THE POTENTIOMETER DIVIDER  
Voltage Output Operation  
The digital potentiometer easily generates output voltages at wiper-  
to-B and wiper-to-A to be proportional to the input voltage at  
A-to-B. Ignore the effect of the wiper resistance at the moment.  
For example, connecting A-terminal to 5 V and B-terminal to  
ground produces an output voltage at the wiper-to-B starting at  
zero volts up to 1 LSB less than 5 V. Each LSB of voltage is equal  
to the voltage applied across terminal AB divided by the 256 posi-  
tion of the potentiometer divider. Since the AD5260/AD5262  
operates from dual supplies, the general equation defining the  
output voltage at VW with respect to ground for any given input  
voltage applied to terminals AB is:  
Depending on the op amp GBP, reducing the feedback resistor  
may extend the Zero’s frequency far enough to overcome the prob-  
lem. A better approach, however, is to include a compensation  
capacitor C2 to cancel the effect caused by C1. Optimum compen-  
sation occurs when R1 ꢂ C1 = R2 ꢂ C2. This is not an option  
because of the variation of R2. As a result, one may use the relation-  
ship above and scale C2 as if R2 is at its maximum value. Doing so  
may overcompensate and compromise the performance slightly  
when R2 is set at low values. However, it will avoid the ringing or  
oscillation at the worst case. For critical applications, C2 should  
be found empirically to suit the need. In general, C2 in the range  
of a few pF to no more than a few tenths of pF is usually adequate  
for the compensation.  
D
256  
VW D =  
¥VAB +VB  
(3)  
(
)
Operation of the digital potentiometer in the divider mode results  
in more accurate operation over temperature. Unlike the rheostat  
mode, the output voltage is dependent on the ratio of the internal  
resistors RWA and RWB and not the absolute values; therefore, the  
drift reduces to 5 ppm/∞C.  
APPLICATIONS  
Bipolar DC or AC Operation from Dual Supplies  
The AD5260/AD5262 can be operated from dual supplies enabling  
control of ground referenced AC signals or bipolar operation.  
The AC signal, as high as VDD/VSS, can be applied directly across  
terminals A–B with output taken from terminal W. See Figure 13  
for a typical circuit connection.  
Similarly, there are W and A terminal capacitances connected to  
the output (not shown). Fortunately their effect at this node is less  
significant, and the compensation can be avoided in most cases.  
Programmable Voltage Reference  
For voltage divider mode operation, Figure 15, it is common  
to buffer the output of the digital potentiometer unless the load is  
much larger than RWB. Not only does the buffer serve the pur-  
pose of impedance conversion, but it also allows a heavier load  
to be driven.  
–14–  
REV. 0  
1...11121314151617...20

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AD5260BRU50 替代型号

型号 品牌 替代类型 描述 数据表
AD5260BRUZ50-REEL7 ADI

完全替代

 1-/2-Channel 15 V Digital Potentiometer
AD5260BRUZ50 ADI

完全替代

 1-/2-Channel 15 V Digital Potentiometer
AD5260BRU50-REEL7 ADI

完全替代

 1-/2-Channel 15 V Digital Potentiometers

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