AD629BR-REEL

更新时间： 2024-01-21 01:36:15

品牌	Logo	应用领域
亚德诺 - ADI		运算放大器放大器电路光电二极管
页数	文件大小	规格书
12页	303K
描述
High Common-Mode Voltage Difference Amplifier

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技术参数
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AD629BR-REEL 技术参数

是否无铅：	不含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	SOP,	针数：	8
Reach Compliance Code：	unknown	风险等级：	5.14
放大器类型：	OPERATIONAL AMPLIFIER	标称共模抑制比：	96 dB
最大输入失调电压：	1000 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：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	260
座面最大高度：	1.75 mm	标称压摆率：	2.1 V/us
子类别：	Operational 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	端子面层：	MATTE TIN
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：	40
宽度：	3.9 mm	Base Number Matches：	1

AD629BR-REEL 数据手册

AD629

shows some sample error voltages generated by a common-mode

voltage of 200 V dc with shunt resistors from 20 Ω to 2000 Ω.

Assuming that the shunt resistor has been selected to utilize the

full 10 V output swing of the AD629, the error voltage becomes

quite signiﬁcant as R_SHUNTincreases.

DIGITAL

ANALOG POWER

SUPPLY

POWER SUPPLY

+5V

GND

–5V

+5V

GND

0.1␮F

0.1␮F 0.1␮F

Table I. Error Resulting from Large Values of R_SHUNT

(Uncompensated Circuit)

AGND

DGND

GND

–V

+IN

AD7892-2

␮PROCESSOR

AD629

OUT

IN1

R_S(⍀)

Error V_OUT(V)

Error Indicated (mA)

–IN

REF(+)

REF(–)

IN2

1000

2000

0.01

0.498

0.5

0.498

0.5

Figure 31. Optimal Grounding Practice for a Bipolar Supply

Environment with Separate Analog and Digital Supplies

If it is desired to measure low current or current near zero in a

high common-mode environment, an external resistor equal to

the shunt resistor value may be added to the low impedance side

of the shunt resistor as shown in Figure 33.

POWER SUPPLY

+5V

GND

0.1␮F

AD629

21.1k⍀

0.1␮F

REF(–)

–IN

AGND DGND

ADC

380k⍀ 380k⍀

COMP

–V

GND

+IN

0.1␮F

AD629

OUT

SHUNT

␮PROCESSOR

380k⍀

20k⍀

+IN

–IN

REF(+)

REF(–)

OUT

REF

–V

REF(+)

Figure 32. Optimal Ground Practice in a Single Supply

Environment

0.1␮F

–V

NC = NO CONNECT

Figure 33. Compensating for Large Sense Resistors

If there is only a single power supply available, it must be shared

by both digital and analog circuitry. Figure 32 shows how to

minimize interference between the digital and analog circuitry.

In this example, the ADC’s reference is used to drive the

AD629’s REF(+) and REF(–) pins. This means that the reference

Output Filtering

A simple 2-pole low-pass Butterworth ﬁlter can be implemented

using the OP177 at the output of the AD629 to limit noise at

the output, as shown in Figure 34. Table II gives recommended

component values for various corner frequencies, along with the

peak-to-peak output noise for each case.

must be capable of sourcing and sinking a current equal to V_CM

200 kΩ. As in the previous case, separate analog and digital

ground planes should be used (reasonably thick traces can be

used as an alternative to a digital ground plane). These ground

planes should be connected at the power supply’s ground pin.

Separate traces (or power planes) should be run from the power

supply to the supply pins of the digital and analog circuits. Ideally,

each device should have its own power supply trace, but these

can be shared by a number of devices as long as a single trace is

not used to route current to both digital and analog circuitry.

AD629

21.1k⍀

REF(–)

0.1␮F

380k⍀ 380k⍀

–IN

OP177

0.1␮F

OUT

380k⍀

20k⍀

+IN

–V

REF(+)

–V

Using a Large Sense Resistor

0.1␮F

Insertion of a large shunt resistance across the input Pins 2 and 3

will imbalance the input resistor network, introducing a common-

mode error. The magnitude of the error will depend on the

common-mode voltage and the magnitude of R_SHUNT. Table I

NC = NO CONNECT

Figure 34. Filtering of Output Noise Using a 2-Pole

Butterworth Filter

Table II. Recommended Values for 2-Pole Butterworth Filter

Corner Frequency

Output Noise (p-p)

No Filter

50 kHz

5 kHz

500 Hz

50 Hz

3.2 mV

1 mV

0.32 mV

100 µV

32 µV

2.94 kΩ 1%

2.7 kΩ 10%

1.58 kΩ 1%

1.5 kΩ 10%

2.2 nF 10%

22 nF 10%

220 nF 10%

2.2 µF 20%

1 nF 10%

10 nF 10%

0.1 µF 10%

1 µF 20%

REV. A

–9–

1...6 7 8910 11 12

中文翻译

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AD629BR-REEL 替代型号

型号	品牌	替代类型	描述	数据表
AD629BRZ-RL	ADI	类似代替	High Common-Mode Voltage, Difference Amplifier

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