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| 型號： | AD823ARZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP JFET R-R DUAL LN 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | J-FET |
| 電路數(shù)： | 2 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 25 V/µs |
| -3db帶寬： | 16MHz |
| 電流 - 輸入偏壓： | 5pA |
| 電壓 - 輸入偏移： | 700µV |
| 電流 - 電源： | 7mA |
| 電流 - 輸出 / 通道： | 17mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 36 V，±1.5 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 剪切帶 (CT) |
| 其它名稱： | AD823ARZ-R7CT |
Data Sheet
AD823
Rev. E | Page 17 of 20
Second-Order Low-Pass Filter
Figure 43 depicts the AD823 configured as a second-order
Butterworth low-pass filter. With the values as shown, the
corner frequency equals 200 kHz. Component selection is
shown in the following equations:
R1 = R2 = User Selected (Typical Values: 10 kΩ to 100 kΩ)
R1
f
.
farads
C1
cutoff
2π
414
1
R1
f
C2
cutoff
2π
707
.
0
1/2
AD823
C3
0.1F
+5V
C4
VOUT
VIN
C1
28pF
–5V
C2
56pF
R1
20k
R2
20k
50pF
00
90
1-
04
3
Figure 43. Second-Order Low-Pass Filter
A plot of the filter is shown in Figure 44; better than 50 dB of
high frequency rejection is provided.
FREQUENCY (Hz)
–40
HI
G
H
F
R
E
Q
UE
NC
Y
RE
JE
CT
IO
N
(
d
B)
1k
–50
–30
–60
0
–20
10k
100k
1M
10M
100M
–10
VDB – VOUT
00
90
1-
04
4
Figure 44. Frequency Response of Filter
Single-Supply Half-Wave and Full-Wave Rectifiers
An AD823 configured as a unity-gain follower and operated
with a single supply can be used as a simple half-wave rectifier.
The AD823 inputs maintain picoamp level input currents even
when driven well below the minus supply. The rectifier puts
that behavior to good use, maintaining an input impedance of
over 1011 Ω for input voltages from within 1 V of the positive
supply to 20 V below the negative supply.
The full-wave and half-wave rectifier shown in Figure 45
operates as follows: when VIN is above ground, R1 is boot-
strapped through the unity-gain follower A1 and the loop of
Amplifier A2. This forces the inputs of A2 to be equal, thus no
current flows through R1 or R2, and the circuit output tracks
the input. When VIN is below ground, the output of A1 is forced
to ground. The noninverting input of Amplifier A2 sees the
ground level output of A1; therefore, A2 operates as a unity-
gain inverter. The output at Node C is then a full-wave rectified
version of the input. Node B is a buffered half-wave rectified
version of the input. Input voltage supply to ±18 V can be
rectified, depending on the voltage supply used.
3
2
1
8
4
0.01F
VIN
+VS
1/2
AD823
HALF-WAVE
RECTIFIED OUTPUT
FULL-WAVE
RECTIFIED OUTPUT
A1
R2
100k
R1
100k
6
5
7
1/2
AD823
A2
A
B
C
A2
00
90
1-
04
4
Figure 45. Full-Wave and Half-Wave Rectifier
100
A
B
C
2V
200s
2V
10
0%
00
90
1-
04
6
90
Figure 46. Single-Supply Half-Wave and Full-Wave Rectifier
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| AD823ARZ-RL | 功能描述:IC OPAMP JFET R-R DUAL LN 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
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