參數(shù)資料
型號: AD8515ART-REEL
廠商: Analog Devices Inc
文件頁數(shù): 7/16頁
文件大?。?/td> 0K
描述: IC AMP GP R-R CMOS 5MHZ SOT23-5
設(shè)計資源: Extending the Capacitive Input Range of AD7745/AD7746 (CN0129)
標準包裝: 10,000
放大器類型: 通用
電路數(shù): 1
輸出類型: 滿擺幅
轉(zhuǎn)換速率: 2.7 V/µs
增益帶寬積: 5MHz
電流 - 輸入偏壓: 5pA
電壓 - 輸入偏移: 1000µV
電流 - 電源: 410µA
電流 - 輸出 / 通道: 20mA
電壓 - 電源,單路/雙路(±): 1.8 V ~ 5 V
工作溫度: -40°C ~ 125°C
安裝類型: 表面貼裝
封裝/外殼: SC-74A,SOT-753
供應(yīng)商設(shè)備封裝: SOT-23-5
包裝: 帶卷 (TR)
AD8515
Rev. D | Page 15 of 16
WIEN BRIDGE OSCILLATOR
The circuit in Figure 38 can be used to generate a sine wave, one
of the most fundamental waveforms. Known as a Wien Bridge
oscillator, it has the advantage of requiring only one low power
amplifier. This is an important consideration, especially for battery-
operated applications where power consumption is a critical issue.
To keep the equations simple, the resistor and capacitor values
used are kept equal. For the oscillation to happen, two conditions
have to be met. First, there should be a zero phase shift from the
input to the output, which happens at the oscillation frequency of
C10
R10
f
OSC
×
π
=
2
1
Second, at this frequency, the ratio of VOUT to the voltage at the
positive input (+IN, Pin 3) has to be 3, which means that the
ratio of R11:R12 should be greater than 2.
0
30
24
-0
38
C10
1nF
C9
1nF
R19
1k
VEE
VCC
R13
1k
R12
1k
1
AD8515
3
2
U10
V+
V–
+
R11
2.05k
Figure 38. Low Power Wien Bridge Oscillator
High frequency oscillators can be built with the AD8515,
due to its wide bandwidth. Using the values shown, an oscilla-
tion frequency of 130 kHz is created and is shown in Figure 39.
If R11 is too low, the oscillation might converge; if too large,
the oscillation diverges until the output clips (VS = ±2.5 V,
fOSC = 130 kHz).
030
24
-03
9
VO
L
T
A
G
E
(2
V/
D
IV
)
Figure 39. Output of Wien Bridge Oscillator
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