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AD5282BRUZ200-R72 PDF预览

AD5282BRUZ200-R72

更新时间: 2024-02-14 19:45:34
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亚德诺 - ADI 数字电位计
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28页 964K
描述
Single/Dual,15 V/5 V,256-Position I2C-Compatible Digital Potentiometer

AD5282BRUZ200-R72 数据手册

 浏览型号AD5282BRUZ200-R72的Datasheet PDF文件第20页浏览型号AD5282BRUZ200-R72的Datasheet PDF文件第21页浏览型号AD5282BRUZ200-R72的Datasheet PDF文件第22页浏览型号AD5282BRUZ200-R72的Datasheet PDF文件第24页浏览型号AD5282BRUZ200-R72的Datasheet PDF文件第25页浏览型号AD5282BRUZ200-R72的Datasheet PDF文件第26页 
AD5ꢀ80/AD5ꢀ8ꢀ  
PROGRAMMABLE LOW-PASS FILTER  
In analog-to-digital conversion applications, it is common to  
include an antialiasing filter to band-limit the sampling signal.  
Dual-channel digital potentiometers can be used to construct  
a second-order Sallen key low-pass filter (see Figure 63). The  
At resonance, setting the following balances the bridge:  
R2  
(16)  
= 2  
R1  
In practice, R2/R1 should be set slightly larger than 2 to ensure  
that oscillation can start. On the other hand, the alternate turn-  
on of Diode D1 and Diode D2 ensures that R2/R1 are smaller  
than 2 momentarily and, therefore, stabilizes the oscillation.  
design equations are  
2
VO  
ωO  
ωO  
Q
=
(11)  
S2 +  
S + ωO  
V
2
i
Once the frequency is set, the oscillation amplitude can be  
tuned by R2B because  
1
ωO =  
(12)  
(13)  
R1R2C1C2  
2
(17)  
VO = ID R2B +VD  
3
1
1
Q =  
+
R1C1 R2C2  
VO, ID, and VD are interdependent variables. With proper  
selection of R2B, an equilibrium is reached such that VO  
converges. R2B can be in series with a discrete resistor to  
increase the amplitude, but the total resistance cannot be  
too large to prevent saturation of the output.  
FREQUENCY  
Users can first select some convenient values for the capacitors.  
To achieve maximally flat bandwidth where Q = 0.707, let C1 be  
twice the size of C2 and let R1 = R2. As a result, R1 and R2 can be  
adjusted to the same settings to achieve the desirable bandwidth.  
C1  
I
I
ADJUSTMENT  
C
R
2.2nF  
10k  
VP  
C
B
A
B
+2.5V  
C
2.2nF  
R
10kꢀ  
R1  
R2  
W
+2.5V  
A
B
A
B
W
V
V+  
AD8601  
I
A
V+  
V
O
U
W
W
1
V–  
U
V
OP1177  
V–  
O
R
R
I
1
R1 = R1 = R2B = AD5282  
D1 = D2 = 1N4148  
C2  
C
–2.5V  
–2.5V  
ADJUSTED TO  
SAME SETTING  
VN  
R2  
A
2.1kꢀ  
D1  
D2  
R2  
10kꢀ  
B
Figure 63. Sallen Key Low-Pass Filter  
B
A
R1  
1kꢀ  
PROGRAMMABLE OSCILLATOR  
W
In a classic Wien-bridge oscillator (Figure 64), the Wien  
network (R, R', C, C') provides positive feedback, while R1  
and R2 provide negative feedback. At the resonant frequency, fO,  
the overall phase shift is 0, and the positive feedback causes the  
circuit to oscillate. With R = R', C = C', and R2 = R2A//(R2B +  
AMPLITUDE  
ADJUSTMENT  
Figure 64. Programmable Oscillator with Amplitude Control  
R
diode), the oscillation frequency is  
1
1
(14)  
ωO  
=
or fo =  
RC  
2πRC  
where R is equal to RWA such that  
256 D  
256  
R =  
RAB  
(15)  
Rev. C | Page 23 of 28  
 
 
 

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