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AD5262BRU200-REEL7 PDF预览

AD5262BRU200-REEL7

更新时间： 2024-01-16 18:06:51
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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AD5262BRU200-REEL7 数据手册

 浏览型号AD5262BRU200-REEL7的Datasheet PDF文件第13页浏览型号AD5262BRU200-REEL7的Datasheet PDF文件第14页浏览型号AD5262BRU200-REEL7的Datasheet PDF文件第15页浏览型号AD5262BRU200-REEL7的Datasheet PDF文件第17页浏览型号AD5262BRU200-REEL7的Datasheet PDF文件第18页浏览型号AD5262BRU200-REEL7的Datasheet PDF文件第19页 
AD5260/AD5262  
that can deliver 20 mA at 2.048 V. The load current is simply the  
voltage across terminals B-to-W of the digital pot divided by RS.  
Programmable Low-Pass Filter  
Digital potentiometer AD5262 can be used to construct a second  
order Sallen Key Low-Pass Filter (see Figure 21). The design  
equations are:  
VREF ¥ D  
IL  
=
(7)  
RS  
2
VO  
Vi  
wO  
w
Q
=
=
؉5V  
2
(9)  
S2 + O S + wO  
2
V
U1  
IN  
1
REF191  
3
wO  
(10)  
(11)  
0 TO (2.048 ؉ V )  
L
SLEEP  
6
R1R2C1C2  
V
OUT  
B
W
C1  
AD5260  
GND  
4
1␮F  
1
1
A
+5V  
Q =  
+
R1C1 R2C2  
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, users can adjust  
R1 and R2 to the same settings to achieve the desirable bandwidth.  
U2  
–
R
S
OP1177  
+
102⍀  
–2.048V TO V  
L
V
L
R
L
100⍀  
I
L
–5V  
C1  
Figure 19. Programmable 4-to-20 mA Current Source  
+2.5V  
The circuit is simple, but be aware that dual-supply op amps are  
ideal because the ground potential of REF191 can swing from  
–2.048 V at zero scale to VL at full scale of the potentiometer  
setting. Although the circuit works under single supply, the pro-  
grammable resolution of the system will be reduced.  
R1  
R2  
A
B
A
B
V
i
AD8601  
–2.5V  
V
O
W
W
R
R
C2  
Programmable Bidirectional Current Source  
ADJUSTED TO  
SAME SETTINGS  
For applications that require bidirectional current control or higher  
voltage compliance, a Howland current pump can be a solution  
(see Figure 20). If the resistors are matched, the load current is:  
Figure 21. Sallen Key Low-Pass Filter  
Programmable Oscillator  
R2A + R2B /R1  
(
)
(8)  
IL  
=
¥VW  
In a classic Wien-bridge oscillator, Figure 22, 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 zero, and the positive feedback causes the  
circuit to oscillate. With R = R’, C = C’, and R2 = R2A//(R2B+  
RDIODE), the oscillation frequency is:  
R2B  
R1  
R2  
150k⍀  
15k⍀  
C1  
10pF  
+15V  
1
RC  
1
wO  
=
or fO  
=
(12)  
2pRC  
C2  
A2  
10pF  
AD8016  
+5V  
where R is equal to RWA such that:  
+15V  
R
L
256 – D  
256  
A
R =  
RAB  
50⍀  
R1  
(13)  
(14)  
–15V  
R2A  
150k⍀  
AD5260  
W
V
L
OP2177  
B
At resonance, setting  
14.95k⍀  
R
500⍀  
L
R2  
= 2  
R1  
A1  
–5V  
–15V  
I
L
balances the bridge. In practice, R2/R1 should be set slightly larger  
than 2 to ensure the oscillation can start. On the other hand, the  
alternate turn-on of the diodes D1 and D2 ensures R2/R1 to be  
smaller than 2 momentarily and therefore stabilizes the oscillation.  
Figure 20. Programmable Bidirectional Current Source  
Once the frequency is set, the oscillation amplitude can be tuned  
by R2B since:  
2
3
VO = IDR2B +VD  
(15)  
–16–  
REV. 0  
1...1314151617181920

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