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AD8428ARZ PDF预览

AD8428ARZ

更新时间： 2024-01-09 04:25:55
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
20页 348K
描述
Low Noise, Low Gain Drift, G = 2000

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中文翻译

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AD8428ARZ 技术参数

生命周期：Active包装说明：DIE,
Reach Compliance Code：compliant风险等级：5.76
放大器类型：INSTRUMENTATION AMPLIFIER最大平均偏置电流 (IIB)：0.2 µA
标称带宽 (3dB)：3.5 MHz最小共模抑制比：130 dB
最大输入失调电流 (IIO)：0.05 µA最大输入失调电压：100 µV
JESD-30 代码：R-XUUC-N8长度：2.89 mm
负供电电压上限：-18 V标称负供电电压 (Vsup)：-15 V
最大非线性：0.0005%功能数量：1
端子数量：8最高工作温度：85 °C
最低工作温度：-40 °C封装主体材料：UNSPECIFIED
封装代码：DIE封装形状：RECTANGULAR
封装形式：UNCASED CHIP座面最大高度：0.3048 mm
标称压摆率：50 V/us子类别：Instrumentation Amplifier
供电电压上限：18 V标称供电电压 (Vsup)：15 V
表面贴装：YES温度等级：INDUSTRIAL
端子形式：NO LEAD端子位置：UPPER
标称电压增益：2000宽度：1.755 mm
Base Number Matches：1

AD8428ARZ 数据手册

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Data Sheet  
AD8428  
Input Voltages Beyond the Rails  
INPUT BIAS CURRENT RETURN PATH  
If voltages beyond the rails are expected, use an external resistor  
in series with each input to limit current during overload condi-  
tions. The limiting resistor at each input can be computed using  
the following equation:  
The input bias current of the AD8428 must have a return path  
to ground. When the source, such as a thermocouple, cannot  
provide a current return path, one should be created, as shown  
in Figure 41.  
INCORRECT  
CORRECT  
V
IN −VSUPPLY  
+V  
S
+V  
S
RPROTECT ≥  
IMAX  
Noise sensitive applications may require a lower protection  
resistance. Low leakage diode clamps, such as the BAV199, can  
be used at the inputs to shunt current away from the AD8428  
inputs and, therefore, allow smaller protection resistor values.  
To ensure that current flows primarily through the external  
protection diodes, place a small value resistor, such as a 33 Ω  
resistor, between the diodes and the AD8428.  
AD8428  
AD8428  
REF  
REF  
REF  
REF  
–V  
–V  
S
S
TRANSFORMER  
TRANSFORMER  
+V  
S
+V  
+V  
S
S
R
+
IN+  
–
R
+V  
S
+V  
S
PROTECT  
I
33Ω  
PROTECT  
I
+
IN+  
–
V
V
–V  
+V  
S
AD8428  
AD8428  
S
R
R
PROTECT  
33Ω  
PROTECT  
AD8428  
AD8428  
+
IN–  
–
+
IN–  
–
REF  
–V  
S
–V  
S
V
V
–V  
S
10MΩ  
SIMPLE METHOD  
LOW NOISE METHOD  
–V  
–V  
S
S
Figure 42. Protection for Voltages Beyond the Rails  
THERMOCOUPLE  
THERMOCOUPLE  
Large Differential Input Voltage at High Gain  
+V  
+V  
S
S
If large differential voltages at high gain are expected, use  
an external resistor in series with each input to limit current  
during overload conditions. The limiting resistor at each input  
can be computed using the following equation:  
C
C
C
R
R
1
fHIGH-PASS  
=
AD8428  
2πRC  
AD8428  
C
REF  
⎛
⎜
⎞
⎟
VDIFF − 1V  
1
2
RPROTECT  
≥
×
− RG  
⎜
⎝
⎟
⎠
IMAX  
–V  
–V  
S
S
CAPACITIVELY COUPLED  
CAPACITIVELY COUPLED  
Noise sensitive applications may require a lower protection  
resistance. Low leakage diode clamps, such as the BAV199,  
can be used across the AD8428 inputs to shunt current away  
from the inputs and, therefore, allow smaller protection resistor  
values.  
Figure 41. Creating an Input Bias Current Return Path  
INPUT PROTECTION  
Do not allow the inputs of the AD8428 to exceed the ratings  
stated in the Absolute Maximum Ratings section. If these ratings  
cannot be adhered to, add protection circuitry in front of the  
AD8428 to limit the maximum current into the inputs (see the  
R
PROTECT  
I
+
V
DIFF  
–
AD8428  
I
MAX section).  
R
PROTECT  
IMAX  
Figure 43. Protection for Large Differential Voltages  
The maximum current into the AD8428 inputs, IMAX, depends  
on time and temperature. At room temperature, the device can  
withstand a current of 10 mA for at least one day. This time is  
cumulative over the life of the device.  
Rev. A | Page 15 of 20  
 
 
 
 
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