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AD5231BRUZ50-REEL7

更新时间： 2024-01-13 23:17:58
品牌 Logo 应用领域
亚德诺 - ADI 数字电位计存储
页数 文件大小 规格书
28页 536K
描述
Nonvolatile Memory, 1024-Position Digital Potentiometer

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AD5231BRUZ50-REEL7 数据手册

 浏览型号AD5231BRUZ50-REEL7的Datasheet PDF文件第20页浏览型号AD5231BRUZ50-REEL7的Datasheet PDF文件第21页浏览型号AD5231BRUZ50-REEL7的Datasheet PDF文件第22页浏览型号AD5231BRUZ50-REEL7的Datasheet PDF文件第24页浏览型号AD5231BRUZ50-REEL7的Datasheet PDF文件第25页浏览型号AD5231BRUZ50-REEL7的Datasheet PDF文件第26页 
Data Sheet  
AD5231  
APPLICATIONS  
V
DD  
BIPOLAR OPERATION FROM DUAL SUPPLIES  
U2  
AD5231  
A
V+  
OP2177  
V–  
The AD5231 can be operated from dual supplies 2.5 V, which  
enables control of ground referenced ac signals or bipolar  
operation. AC signals as high as VDD/VSS can be applied directly  
across Terminal A to Terminal B with output taken from  
Terminal W. See Figure 46 for a typical circuit connection.  
+2.5V  
W
V
O
B
C
C
R2  
R1  
2.2pF  
A2  
B
A
V
SS  
–KVi  
Vi  
W
V
DD  
U1  
AD5231  
V+  
OP2177  
V–  
SS  
V
CS  
V
DD  
DD  
µC  
GND  
CLK  
SDI  
SCLK  
MOSI  
A
A
V
SS  
±2.5V p-p  
±1.25V p-p  
W
B
Figure 48. Bipolar Programmable Gain Amplifier  
GND  
In the simpler (and much more usual) case where K = 1,  
a pair of matched resistors can replace U1. Equation 4 can be  
simplified to  
AD5231  
V
SS  
D = MIDSCALE  
–2.5V  
VO  
VI  
R2  
R1  
2D  
   
   
2
= 1+  
×
−1  
(5)  
   
Figure 46. Bipolar Operation from Dual Supplies  
1024  
HIGH VOLTAGE OPERATION  
Table 20 shows the result of adjusting D with A2 configured as a  
unity gain, a gain of 2, and a gain of 10. The result is a bipolar  
amplifier with linearly programmable gain and 1024-step  
resolution.  
The digital potentiometer can be placed directly in the feedback  
or input path of an op amp for gain control, provided that the  
voltage across Terminals A–B, Terminals W–A, or Terminals  
W–B does not exceed |5 V|. When high voltage gain is needed,  
users should set a fixed gain in an op amp operated at a higher  
voltage and let the digital potentiometer control the adjustable  
input. Figure 47 shows a simple implementation.  
Table 20. Result of Bipolar Gain Amplifier  
D
R1 = ∞, R2 = 0  
R1 = R2  
R2 = 9 × R1  
0
−1  
−0.5  
0
0.5  
0.992  
−2  
−1  
0
−10  
−5  
0
5
9.92  
R
2R  
256  
512  
768  
1023  
C
C
2.2pF  
15V  
V+  
1
1.984  
5V  
–
+
10-BIT BIPOLAR DAC  
A1  
V
O
A
V–  
W
AD5231  
0VTO15V  
If the circuit in Figure 48 is changed with the input taken from a  
voltage reference and A2 configured as a buffer, a 10-bit bipolar  
DAC can be realized. Compared to the conventional DAC, this  
circuit offers comparable resolution but not the precision  
because of the wiper resistance effects. Degradation of the  
nonlinearity and temperature coefficient is prominent near  
both ends of the adjustment range. On the other hand, this  
circuit offers a unique nonvolatile memory feature that in some  
cases outweighs any shortfall in precision.  
B
Figure 47. 15 V Voltage Span Control  
BIPOLAR PROGRAMMABLE GAIN AMPLIFIER  
There are several ways to achieve bipolar gain. Figure 48 shows  
one versatile implementation. Digital potentiometer U1 sets the  
adjustment range; the wiper voltage VW2 can, therefore, be  
programmed between Vi and −KVi at a given U2 setting. For  
linear adjustment, configure A2 as a noninverting amplifier and  
the transfer function becomes  
The output of this circuit is  
2D  
1024  
2
VO  
=
−1 ×V  
(6)  
REF  
VO  
VI  
R2  
R1  
D2  
= 1 +  
×
× (1 + K) − K  
(4)  
1024  
where:  
K is the ratio of RWB/RWA that is set by U1.  
D is the decimal equivalent of the input code.  
Rev. D | Page 23 of 28  
 
 
 
 
 
 
 
 
 
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AD5231BRUZ50-REEL7 替代型号

型号 品牌 替代类型 描述 数据表
AD5231BRUZ50-REEL7 ADI

当前型号

 Nonvolatile Memory, 1024-Position Digital Potentiometer
AD5231BRU50 ADI

完全替代

 Nonvolatile Memory, 1024-Position Digital Potentiometers

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