参数资料
型号: AD8428BRZ
厂商: Analog Devices Inc
文件页数: 9/20页
文件大小: 0K
描述: IC OPAMP INST 3.5MHZ LN 8SOIC
标准包装: 1
放大器类型: 仪表
电路数: 1
转换速率: 50 V/µs
-3db带宽: 3.5MHz
电流 - 输入偏压: 200nA
电压 - 输入偏移: 25µV
电流 - 电源: 6.5mA
电流 - 输出 / 通道: 30mA
电压 - 电源,单路/双路(±): ±4 V ~ 18 V
工作温度: -40°C ~ 85°C
安装类型: *
封装/外壳: *
供应商设备封装: *
包装: *
Data Sheet
AD8428
Rev. A | Page 17 of 20
Voltage Noise of the Instrumentation Amplifier
Total Noise Density Calculation
Unlike other instrumentation amplifiers in which an external
resistor is used to set the gain, the voltage noise specification
of the AD8428 already includes the input noise, output noise,
and the RG resistor noise.
To determine the total noise of the in-amp, referred to input,
combine the source resistance noise, voltage noise, and current
noise contribution by the sum of squares method.
For example, if the R1 source resistance in Figure 45 is 4 kΩ
and the R2 source resistance is 1 kΩ, the total noise, referred
to input, is
Current Noise of the Instrumentation Amplifier
The contribution of current noise to the input stage in nV/√Hz
is calculated by multiplying the source resistance in kΩ by the
specified current noise of the instrumentation amplifier in
pA/√Hz.
Hz
nV/
0
.
11
2
.
6
5
.
1
9
.
8
2
=
+
For example, if the R1 source resistance in Figure 45 is 4 kΩ
and the R2 source resistance is 1 kΩ, the total effect from the
current noise is calculated as follows:
() (
)
Hz
nV/
2
.
6
25
.
2
36
5
.
1
5
.
1
4
2
=
+
=
×
+
×
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