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| 型号： | AD8622ARZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP R-R 540KHZ LP 8SOIC |
| 设计资源： | 8-Pole Active Low-Pass Filter Optimized for Precision, Low Noise, and High Gain Using AD8622 and ADA4062-2 (CN0127) |
| 标准包装： | 1,000 |
| 放大器类型： | 电压反馈 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.48 V/µs |
| 增益带宽积： | 560kHz |
| 电流 - 输入偏压： | 45pA |
| 电压 - 输入偏移： | 10µV |
| 电流 - 电源： | 215µA |
| 电流 - 输出 / 通道： | 40mA |
| 电压 - 电源，单路/双路(±)： | ±2.5 V ~ 15 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 带卷 (TR) |
| 其它名称： | AD8622ARZ-REEL7-ND AD8622ARZ-REEL7TR |
Data Sheet
AD8622/AD8624
Rev. D | Page 15 of 20
APPLICATIONS INFORMATION
INPUT PROTECTION
The maximum differential input voltage that can be applied to
connected across its inputs and series resistors at each input.
These internal diodes and series resistors limit the maximum
differential input voltage to ±10 V and are needed to prevent base-
emitter junction breakdown from occurring in the input stage of
applied. In addition, the internal resistors limit the currents that
flow through the diodes. However, in applications where large
differential voltages can be inadvertently applied to the device,
large currents may still flow through these diodes. In such a
case, external resistors must be placed at both inputs of the op
amp to limit the input currents to ±10 mA (see Figure 54).
AD862x
500
R1
R2
2
3
1
0
752
7-
05
5
Figure 54. Input Protection
PHASE REVERSAL
An undesired phenomenon, phase reversal (also known as
phase inversion) occurs in many op amps when one or both of
the inputs are driven beyond the specified input voltage range
(IVR), in effect reversing the polarity of the output. In some
cases, phase reversal can induce lockups and even cause
equipment damage as well as self destruction.
prevent output phase reversal when both inputs are maintained
within the specified input voltage range. In addition, even if one
or both inputs exceed the input voltage range but remain within
the supply rails, the output still does not phase reverse. Figure 55
configured as a unity-gain buffer with a supply voltage of ±15 V.
07
527
-05
3
TIME (200s/DIV)
VO
L
T
A
G
E
(5V/
D
IV
)
VSY = ±15V
VOUT
VIN
Figure 55. No Phase Reversal
MICROPOWER INSTRUMENTATION AMPLIFIER
The AD8622 is a dual, high precision, rail-to-rail output op amp
operating at just 215 μA quiescent current per amplifier. Its
ultralow offset, offset drift, and voltage noise, combined with its
very low bias current and high common-mode rejection ratio
(CMRR), are ideally suited for high accuracy and micropower
instrumentation amplifier.
Figure 56 shows the classic 2-op-amp instrumentation amplifier
with four resistors using the AD8622. The key to high CMRR
for this instrumentation amplifier are resistors that are well
matched from both the resistive ratio and the relative drift. For
true difference amplification, matching of the resistor ratio is
very important, where R3/R4 = R1/R2. Assuming perfectly
matched resistors, the gain of the circuit is 1 + R2/R1, which is
approximately 100. Tighter matching of two op amps in one
package, like the AD8622, offers a significant boost in performance
over the classical 3-op-amp configuration. Overall, the circuit
only requires about 430 μA of supply current.
+15V
–15V
V2
V1
R1
10.1k
R2
1M
R3
10.1k
R4
1M
VO
0
752
7-
0
54
NOTES
1. VO = 100(V2 – V1)
2. TYPICAL: 0.01mV < |V2 – V1| < 149.7mV
3. TYPICAL: –14.97V < VO < +14.97V
4. USE MATCHED RESISTORS.
1/2
AD8622
+
–
+15V
–15V
1/2
AD8622
+
–
Figure 56. Micropower Instrumentation Amplifier
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