AD8226BRMZ

更新时间： 2024-02-08 23:23:34

品牌	Logo	应用领域
亚德诺 - ADI		仪表放大器放大器电路光电二极管 PC
页数	文件大小	规格书
16页	415K
描述
Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier

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技术参数
数据手册
替代型号

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AD8226BRMZ 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
零件包装代码：	SOIC	包装说明：	ROHS COMPLIANT, MS-012AA, SOIC-8
针数：	8	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.33.00.01
风险等级：	5.66	Is Samacsys：	N
放大器类型：	INSTRUMENTATION AMPLIFIER	JESD-30 代码：	R-PDSO-G8
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：	105 °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）：	NOT SPECIFIED	电源：	+-15 V
认证状态：	Not Qualified	子类别：	Instrumentation Amplifier
最大压摆率：	0.4 mA	标称供电电压 (Vsup)：	15 V
表面贴装：	YES	技术：	BIPOLAR
温度等级：	INDUSTRIAL	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：	NOT SPECIFIED	Base Number Matches：	1

AD8226BRMZ 数据手册

Preliminary Technical Data

AD8226

THEORY OF OPERATION

–V

NODE 3

NODE 4

50kΩ

2.47kΩ

–V

50kΩ

NODE 2

OUT

REF

–V

NODE 1

50kΩ

–V

50kΩ

+IN

–IN

DIFFERENCE

AMPLIFIER STAGE

GAIN STAGE

Figure 3. Simplified Schematic

ARCHITECTURE

GAIN SELECTION

The AD8226 is based on the classic three op amp top olog y. T his

topology has two stages: a preamplifier to provide differential

amplification, followed by a difference amplifier to remove the

common-mode voltage. Fig u re 3 shows a simplified schematic of

the AD8226.

Placing a resistor across the R_Gterminals sets the gain of the

AD8226, which can be calculated by referring to Table 7 or by

using the following gain equ a t i o n :

49.4 kΩ

R_G=

G −1

The first stage works as follows: in ord e r to maintain a constant

voltage across the Bias Resistor R_B, Amplifier A1 must keep

Node 3 a constant diode drop above the positive input voltage.

Similarly, Amplifier A2 keeps Node 4 at a constant diode drop

above the negative input voltage. Therefore a replica of the

differential input voltage is placed across the gain setting

resistor, R_G. The current that flows across this resistance must

also flow through the R1 and R2 resistors, creating a gained

differential signal between the A2 and A1 outputs. Note that, in

addition to a gained differential signal, the original common-

mode signal, shifted a diode drop down, is also still present.

Table 7. Gains Achieved Using 1% Resistors

1% Standard Table Value of R_G(Ω)

Calculated Gain

49.9 k

12.4 k

5.49 k

2.61 k

1.00 k

499

1.990

4.984

9.998

19.93

50.40

100.0

249

199.4

100

495.0

49.9

991.0

The second stage is a difference amplifier, composed of A3 and

four 50 kΩ resistors. The purpose of this stage is to remove the

com m on-mode signal from the amplified differential signal.

The AD8226 defaults to G = 1 when no gain resistor is used.

The tolerance and gain drift of the R_Gresistor should be added

to the AD8226’s specifications to determine the total gain

accuracy of the system. When the gain resistor is not used,

gain error and gain drift are minimal.

Because the input amplifiers employ a current feedback

architecture, the gain-bandwidth product of the AD8226

increases with gain, resulting in a system that does not suffer

from the expected bandwidth loss of voltage feedback

architectures at higher gains.

INPUT PROTECTION

The transfer function of the AD8226 is

The input terminals of the AD8226 have input protection that

allows the i nput voltage to go beyond the rails without

damaging the part. Maximum voltage is –Vs+40 V and

minimum voltage is +Vs-40 V. For example: with 15 V

supplies, the part can withstand input voltages of 25 V; with a

5 V single supply, maximum input voltage is 40 V and

minimum input voltage is 35 V.

V_OUT= G(V_IN+− V_IN−) + V_REF

where

49.4 kΩ

G =1+

Rev. PrA | P a g e 9 of 16

1...6 7 8910 11 12...16

中文翻译

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AD8226BRMZ 替代型号

型号	品牌	替代类型	描述	数据表
AD8226BRMZ-R7	ADI	类似代替	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8228BRMZ	ADI	类似代替	Low Gain Drift Precision Instrumentation Amplifier
AD8223ARMZ	ADI	类似代替	Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier

与AD8226BRMZ相关器件

型号	品牌	获取价格	描述	数据表
AD8226BRMZ-R7	ADI	获取价格	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8226BRMZ-RL	ADI	获取价格	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8226BRZ	ADI	获取价格	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8226BRZ-R7	ADI	获取价格	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8226BRZ-RL	ADI	获取价格	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8226CRMZ	ADI	获取价格	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8226CRMZ-R7	ADI	获取价格	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8226CRMZ-RL	ADI	获取价格	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8226CRZ	ADI	获取价格	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier
AD8226CRZ-R7	ADI	获取价格	Wide Supply Range, Rail-to-Rail Output Instrumentation Amplifier

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