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AD627BR-REEL

更新时间： 2024-01-21 20:14:43
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
页数 文件大小 规格书
16页 546K
描述
Micropower, Single and Dual Supply Rail-to-Rail Instrumentation Amplifier

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AD627BR-REEL 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：SOP, SOP8,.25针数：8
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.31.00.01风险等级：0.92
放大器类型：INSTRUMENTATION AMPLIFIER最大平均偏置电流 (IIB)：0.01 µA
标称带宽 (3dB)：0.08 MHz最小共模抑制比：83 dB
最大输入失调电流 (IIO)：0.001 µA最大输入失调电压：190 µV
JESD-30 代码：R-PDSO-G8JESD-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)：-5 V
最大非线性：0.001%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：3/5/+-5/+-15 V
认证状态：Not Qualified座面最大高度：1.75 mm
标称压摆率：0.05 V/us子类别：Instrumentation Amplifier
供电电压上限：18 V标称供电电压 (Vsup)：5 V
表面贴装：YES温度等级：INDUSTRIAL
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：1000
最小电压增益：5标称电压增益：10
宽度：3.9 mm

AD627BR-REEL 数据手册

 浏览型号AD627BR-REEL的Datasheet PDF文件第7页浏览型号AD627BR-REEL的Datasheet PDF文件第8页浏览型号AD627BR-REEL的Datasheet PDF文件第9页浏览型号AD627BR-REEL的Datasheet PDF文件第11页浏览型号AD627BR-REEL的Datasheet PDF文件第12页浏览型号AD627BR-REEL的Datasheet PDF文件第13页 
AD627  
THEORY OF OPERATION  
Laser trims are performed on R1 through R4 to ensure that  
their values are as close as possible to the absolute values in the  
gain equation. This ensures low gain error and high common-  
mode rejection at all practical gains.  
The AD627 is a true “instrumentation amplifier” built using  
two feedback loops. Its general properties are similar to those of  
the classic “two op amp” instrumentation amplifier configura-  
tion, and can be regarded as such, but internally the details are  
somewhat different. The AD627 uses a modified “current feed-  
back” scheme which, coupled with interstage feedforward  
frequency compensation, results in a much better CMRR  
(Common-Mode Rejection Ratio) at frequencies above dc (no-  
tably the line frequency of 50 Hz–60 Hz) than might otherwise  
be expected of a low power instrumentation amplifier.  
USING THE AD627  
Basic Connections  
Figure 33 shows the basic connection circuit for the AD627.  
The +VS and –VS terminals are connected to the power supply.  
The supply can either be bipolar (VS = ±1.1 V to ±18 V) or  
single supply (–VS = 0 V, +VS = +2.2 V to +36 V). The power  
supplies should be capacitively decoupled close to the devices  
power pins. For best results, use surface mount 0.1 µF ceramic  
chip capacitors.  
Referring to the diagram, (Figure 32), A1 completes a feedback  
loop which, in conjunction with V1 and R5, forces a constant  
collector current in Q1. Assume that the gain-setting resistor  
(RG) is not present for the moment. Resistors R2 and R1 com-  
plete the loop and force the output of A1 to be equal to the  
voltage on the inverting terminal with a gain of (almost exactly)  
1.25. A nearly identical feedback loop completed by A2 forces a  
current in Q2 which is substantially identical to that in Q1, and  
A2 also provides the output voltage. When both loops are bal-  
anced, the gain from the noninverting terminal to VOUT is equal  
to 5, whereas the gain from the output of A1 to VOUT is equal to  
–4. The inverting terminal gain of A1, (1.25) times the gain of  
A2, (–4) makes the gain from the inverting and noninverting  
terminals equal.  
The input voltage, which can be either single ended (tie either  
–IN or +IN to ground) or differential. The difference between  
the voltage on the inverting and noninverting pins is amplified  
by the programmed gain. The programmed gain is set by the  
gain resistor (see below). The output signal appears as the volt-  
age difference between the output pin and the externally applied  
voltage on the REF pin (see below).  
Setting the Gain  
The AD627s gain is resistor programmed by RG, or more pre-  
cisely, by whatever impedance appears between Pins 1 and 8.  
The gain is set according to the equation:  
Gain = 5 + (200 kΩ/RG)  
EXTERNAL GAIN RESISTOR  
R1  
100k⍀  
R4  
100k⍀  
or  
R
G
REF  
–IN  
RG = 200 kΩ/(Gain – 5)  
R2  
25k⍀  
R3  
25k⍀  
+V  
–V  
S
S
+V  
S
It follows that the minimum achievable gain is 5 (for RG =  
With an internal gain accuracy of between 0.05% and 0.7%  
depending on gain and grade, a 0.1% external gain resistor  
∞).  
2k⍀  
2k⍀  
+IN  
Q2  
Q1  
would seem appropriate to prevent significant degradation of the  
overall gain error. However, 0.1% resistors are not available in a  
wide range of values and are quite expensive. Table I shows  
recommended gain resistor values using 1% resistors. For all  
gains, the size of the gain resistor is conservatively chosen as the  
closest value from the standard resistor table that is higher than  
the ideal value. This results in a gain that is always slightly less  
than the desired gain. This prevents clipping of the signal at the  
output due to resistor tolerance.  
–V  
S
A1  
A2  
OUTPUT  
R5  
200k⍀  
R6  
200k⍀  
V1  
–V  
S
Figure 32. Simplified Schematic  
The differential mode gain is equal to 1 + R4/R3, nominally five  
and is factory trimmed to 0.01% final accuracy. Adding an external  
gain setting resistor (RG) increases the gain by an amount equal  
to (R4 + R1)/RG. The output voltage of the AD627 is given by the  
following equation.  
The internal resistors on the AD627 have a negative tempera-  
ture coefficient of –75 ppm/°C max for gains > 5. Using a gain  
resistor that also has a negative temperature coefficient of  
–75 ppm/°C or less will tend to reduce the overall circuit’s gain  
drift.  
V
OUT = [VIN(+) – VIN(–)] × (5 + 200 kΩ/RG) + VREF  
+V  
S
+V  
S
+2.2V TO +36V  
+1.1V TO +18V  
0.1␮F  
0.1␮F  
+IN  
+IN  
R
R
R
R
G
G
V
V
IN  
R
V
R
V
OUT  
OUTPUT  
REF  
OUTPUT  
REF  
IN  
G
OUT  
G
G
G
–IN  
–IN  
REF (INPUT)  
REF (INPUT)  
0.1␮F  
–1.1V TO –18V  
GAIN = 5 + (200k⍀/R  
)
–V  
G
S
Figure 33. Basic Connections for Single and Dual Supplies  
–10–  
REV. A  
1...78910111213...16

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