AD8429

更新时间： 2024-01-17 18:45:16

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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技术参数
数据手册

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AD8429 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	SOIC-8	针数：	8
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.31.00.01	风险等级：	1.75
放大器类型：	INSTRUMENTATION AMPLIFIER	最大平均偏置电流 (IIB)：	0.15 µA
标称带宽 (3dB)：	15 MHz	最小共模抑制比：	90 dB
最大输入失调电流 (IIO)：	0.03 µA	最大输入失调电压：	50 µV
JESD-30 代码：	R-PDSO-G8	JESD-609代码：	e3
长度：	4.9 mm	湿度敏感等级：	1
负供电电压上限：	-18 V	标称负供电电压 (Vsup)：	-15 V
功能数量：	1	端子数量：	8
最高工作温度：	125 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP8,.25	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	260
电源：	+-15 V	认证状态：	Not Qualified
座面最大高度：	1.75 mm	标称压摆率：	22 V/us
子类别：	Instrumentation Amplifier	最大压摆率：	9 mA
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：	AUTOMOTIVE
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	30	最大电压增益：	10000
最小电压增益：	1	标称电压增益：	10
宽度：	3.9 mm	Base Number Matches：	1

AD8429 数据手册

Data Sheet

AD8428

Notch Filter

In contrast, a small Q value increases the range for the same

attenuation, which relaxes the tolerance requirements between

the inductor and capacitor and the frequency uncertainty of the

undesired signal. However, the lower Q value has a significant

effect on signal bandwidth one decade before the notch

frequency.

In cases where the frequency of the interfering signal is well

known, a notch filter can be implemented to help minimize the

impact of the known signal on the measurement. The filter can

be realized by adding a series LC network between the filter

pins, as shown in Figure 48.

+FIL

Q = 1

OUT

AD8428

–FIL

–

–3dB

Q = 0.1

Figure 48. Notch Filter Example

The inductor and capacitor form a resonant circuit that rejects

frequencies near the notch. The center frequency can be

calculated using the following equation:

–20dB

f_N

2π L_FC_F

The Q factor of the filter is given by the following equation:

L_F

6000 C_F

0.01f

0.1f

10f

100f

FREQUENCY (Hz)

Q =

Figure 49. Notch Filter Attenuation with Q = 0.1 and Q = 1

Around the Center Frequency

The accuracy of the center frequency, f_N, depends only on the

tolerance of the capacitor and inductor values, not on the value

of the internal resistors. However, the Q of the circuit depends on

both the tolerance of the external components and the absolute

tolerance of the internal resistors, which is typically 10%.

The maximum attenuation that can be achieved with a notch

filter is at its center frequency, f_N. This maximum attenuation

(or depth of the notch) depends on the equivalent series

resistance of the inductor and capacitor at the center frequency.

Choosing components with high quality factors improves the

rejection at the filter’s center frequency. For information about

calculating the maximum allowed series resistance at the frequency

of interest to obtain the desired attenuation, see the Setting the

Amplifier to Different Gains section.

The Q factor is a filter parameter that indicates how narrow the

notch filter is. It is defined as follows:

f_N

Q =

f_B− f_A

Extracting the Common-Mode Voltage of the Input

where f_Aand f_Bare the frequencies at which there is −3 dB

attenuation on each side of the notch.

The common-mode signal present at the input terminals can be

extracted by inserting two resistors between the filter terminals

and tapping from the center, as shown in Figure 50. The common-

mode voltage, V_CM, is the average of the voltages present at the

two inputs minus a 0.6 V drop.

This equation indicates that the higher the Q, the narrower the

notch—that is, high values of Q increase the selectivity of the

notch. In other words, although high values of Q reduce the

effect of the notch on the amplitude and phase in neighboring

frequencies, the ability to reject the undesired frequency may

also be reduced due to mismatch between it and the actual

center frequency. This mismatch can be caused by frequency

variations on the affecting source and the tolerance of the filter

inductor and capacitor values.

+IN

+FIL

OUT

AD8428

–FIL

–IN

–

Figure 50. Extracting the Common-Mode Voltage

Use resistor values that are high enough to minimize the impact

on gain accuracy. For example, resistor values of 2 MΩ introduce

an additional gain error of less than 0.2%. For information about

the impact of these resistors on the gain of the amplifier, see the

Effect of Passive Network Across the Filter Terminals section.

In contrast, low values of Q work better to ensure that the

interfering frequency is attenuated, but these low values also

affect the signal of interest if it is located close to the center

frequency of the notch.

For example, if the goal is to attenuate the interfering signal by

20 dB, a large Q value reduces the frequency range where the

notch is effective, as shown in Figure 49.

Rev. A | Page 19 of 20

1...16 17 181920

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