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| 型號： | AD5263BRUZ20-REEL7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 19/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DGTL POT QUAD 20K 24-TSSOP |
| 標準包裝： | 1 |
| 接片： | 256 |
| 電阻（歐姆）： | 20k |
| 電路數(shù)： | 4 |
| 溫度系數(shù)： | 標準值 30 ppm/°C |
| 存儲器類型： | 易失 |
| 接口： | I²C，SPI（芯片選擇，設備位址） |
| 電源電壓： | 2.7 V ~ 5.5 V，5 V ~ 15 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 24-TSSOP（0.173"，4.40mm 寬） |
| 供應商設備封裝： | 24-TSSOP |
| 包裝： | 標準包裝 |
| 其它名稱： | AD5263BRUZ20-REEL7DKR |
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AD5263
Data Sheet
Rev. F | Page 26 of 28
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 65). The design
equations are
2
O
I
O
S
Q
S
V
ω
+
=
(10)
C2
C1
R2
R1
O
×
=
1
ω
(11)
C2
R2
C1
R1
Q
×
+
×
=
1
(12)
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, the user can adjust
R1 and R2 to the same settings to achieve the desired bandwidth.
03142-
064
VI
U1
VO
R1
A
R
W
B
R2
A
R
W
B
C2
C
C1
C
+2.5V
V+
V–
–2.5V
AD8601
ADJUSTED TO
SAME SETTING
Figure 65. Sallen-Key Low-Pass Filter
PROGRAMMABLE OSCILLATOR
In a classic Wien bridge oscillator (Figure 66), 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
RC
O
1
=
ω
, or
RC
fO
π
2
1
=
(13)
where R is equal to RWA, such that
AB
R
D
R
256
256
=
(14)
At resonance, setting
2
=
R1
R2
(15)
balances the bridge. In practice, R2/R1 should be set slightly
greater than 2 to ensure that the oscillation can start. On the
other hand, the alternating turn-on of the diodes D1 and D2
ensures that R2/R1 is momentarily less than 2, thereby
stabilizing the oscillation.
Once the frequency is set, the oscillation amplitude can be
tuned by R2B because
D
O
V
R2B
I
V
+
×
=
3
2
(16)
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 should not be so large that it saturates
the output.
03142-
065
FREQUENCY
ADJUSTMENT
2.2nF
C
2.2nF
R’
10k
R
10k
B
A
W
V+
V–
B
W
D1
D2
VO
U1
VP
A
VN
–2.5V
+2.5V
R1
1k
R2B
10k
R2A
2.1k
R1 = R1’ = R2B = AD5263
D1 = D2 = 1N4148
AMPLITUDE
ADJUSTMENT
OP1177
Figure 66. Programmable Oscillator with Amplitude Control
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