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AD8603AUJZ-REEL7 参数 Datasheet PDF下载

AD8603AUJZ-REEL7图片预览
型号: AD8603AUJZ-REEL7
PDF下载: 下载PDF文件 查看货源
内容描述: 精密微功耗,低噪声CMOS轨到轨输入/输出运算放大器 [Precision Micropower, Low Noise CMOS Rail-to-Rail Input/Output Operational Amplifiers]
分类和应用: 运算放大器放大器电路光电二极管
文件页数/大小: 20 页 / 458 K
品牌: ADI [ ADI ]
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AD8603/AD8607/AD8609  
APPLICATIONS  
NO PHASE REVERSAL  
The use of the snubber circuit is usually recommended for unity  
gain configurations. Higher gain configurations help improve  
the stability of the circuit. Figure 44 shows the same output  
response with the snubber in place.  
The AD8603/AD8607/AD8609 do not exhibit phase inversion  
even when the input voltage exceeds the maximum input  
common-mode voltage. Phase reversal can cause permanent  
damage to the amplifier, resulting in system lockups. The  
AD8603/AD8607/AD8609 can handle voltages of up to 1 V  
over the supply.  
V
V
C
= ±0.9V  
= 100mV  
= 2nF  
S
IN  
L
L
R
= 10kΩ  
V
V
A
= ±2.5V  
= 6V p-p  
= 1  
S
V
IN  
IN  
V
L
R
= 10kΩ  
V
OUT  
Figure 42. Output Response to a 2 nF Capacitive Load, Without Snubber  
V
EE  
TIME (4μs/DIV)  
Figure 41. No Phase Response  
V–  
V+  
R
150Ω  
S
INPUT OVERVOLTAGE PROTECTION  
C
L
200mV  
V
+
CC  
C
S
If a voltage 1 V higher than the supplies is applied at either  
input, the use of a limiting series resistor is recommended. If  
both inputs are used, each one should be protected with a  
series resistor.  
47pF  
Figure 43. Snubber Network  
To ensure good protection, the current should be limited to a  
maximum of 5 mA. The value of the limiting resistor can be  
determined from the equation  
V
V
C
R
R
C
= ±0.9V  
= 100mV  
= 2nF  
= 10kΩ  
= 150Ω  
= 470pF  
SY  
IN  
L
L
S
S
(VIN VS)/(RS + ±00 Ω) 5 mA  
DRIVING CAPACITIVE LOADS  
The AD8603/AD8607/AD8609 are capable of driving large  
capacitive loads without oscillating. Figure 4± shows the output  
of the AD8603/AD8607/AD8609 in response to a 100 mV input  
signal, with a ± nF capacitive load.  
Although it is configured in positive unity gain (the worst case),  
the AD8603 shows less than ±0% overshoot. Simple additional  
circuitry can eliminate ringing and overshoot.  
Figure 44. Output Response to a 2 nF Capacitive Load, With Snubber  
One technique is the snubber network, which consists of a  
series RC and a resistive load (see Figure 43). With the snubber  
in place, the AD8603/AD8607/AD8609 are capable of driving  
capacitive loads of ± nF with no ringing and less than 3%  
overshoot.  
Rev. B | Page 12 of 20