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AMP04

更新时间： 2024-01-07 01:58:07
品牌 Logo 应用领域
亚德诺 - ADI 仪表放大器
页数 文件大小 规格书
16页 513K
描述
Precision Single Supply Instrumentation Amplifier

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AMP04 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：DIE
包装说明：DIE, DIE OR CHIP针数：0
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.31.00.01风险等级：5.7
Is Samacsys：N放大器类型：INSTRUMENTATION AMPLIFIER
最大平均偏置电流 (IIB)：0.04 µA标称带宽 (3dB)：0.7 MHz
最小共模抑制比：55 dB最大输入失调电流 (IIO)：0.01 µA
最大输入失调电压：300 µVJESD-30 代码：R-XUUC-N8
负供电电压上限：标称负供电电压 (Vsup)：
功能数量：1端子数量：8
最高工作温度：25 °C最低工作温度：25 °C
封装主体材料：UNSPECIFIED封装代码：DIE
封装等效代码：DIE OR CHIP封装形状：RECTANGULAR
封装形式：UNCASED CHIP峰值回流温度（摄氏度）：NOT SPECIFIED
电源：5/+-15 V认证状态：Not Qualified
筛选级别：MIL-STD-883 Class B (Modified)标称压摆率：0.12 V/us
子类别：Instrumentation Amplifier最大压摆率：0.7 mA
供电电压上限：36 V标称供电电压 (Vsup)：5 V
表面贴装：YES温度等级：OTHER
端子形式：NO LEAD端子位置：UPPER
处于峰值回流温度下的最长时间：NOT SPECIFIED最大电压增益：1000
最小电压增益：1标称电压增益：10
Base Number Matches：1

AMP04 数据手册

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AMP04  
Input Common-Mode Voltage Below Ground  
Although not tested and guaranteed, the AMP04 inputs are bi-  
ased in a way that they can amplify signals linearly with common-  
mode voltage as low as –0.25 volts below ground. This holds  
true over the industrial temperature range from –40°C to +85°C.  
APPLICATIONS  
Common-Mode Rejection  
The purpose of the instrumentation amplifier is to amplify the  
difference between the two input signals while ignoring offset  
and noise voltages common to both inputs. One way of judging  
the device’s ability to reject this offset is the common-mode  
gain, which is the ratio between a change in the common-mode  
voltage and the resulting output voltage change. Instrumenta-  
tion amplifiers are often judged by the common-mode rejection  
ratio, which is equal to 20 × log10 of the ratio of the user-selected  
differential signal gain to the common-mode gain, commonly  
called the CMRR. The AMP04 offers excellent CMRR, guaran-  
teed to be greater than 90 dB at gains of 100 or greater. Input  
offsets attain very low temperature drift by proprietary laser-  
trimmed thin-film resistors and high gain amplifiers.  
Extended Positive Common-Mode Range  
On the high side, other instrumentation amplifier configura-  
tions, such as the three op amp instrumentation amplifier, can  
have severe positive common-mode range limitations. Figure 3  
shows an example of a gain of 1001 amplifier, with an input  
common-mode voltage of 10 volts. For this circuit to function,  
VOB must swing to 15.01 volts in order for the output to go to  
10.01 volts. Clearly no op amp can handle this swing range  
(given a +15 V supply) as the output will saturate long before it  
reaches the supply rails. Again the AMP04’s topology does not  
have this limitation. Figure 4 illustrates the AMP04 operating at  
the same common-mode conditions as in Figure 3. None of the  
internal nodes has a signal high enough to cause amplifier satu-  
ration. As a result, the AMP04 can accommodate much wider  
common-mode range than most instrumentation amplifiers.  
Input Common-Mode Range Includes Ground  
The AMP04 employs a patented topology (Figure 1) that  
uniquely allows the common-mode input voltage to truly extend  
to zero volts where other instrumentation amplifiers fail. To il-  
lustrate, take for example the single supply, gain of 100 instru-  
mentation amplifier as in Figure 2. As the inputs approach zero  
volts, in order for the output to go positive, amplifier A’s output  
(VOA) must be allowed to go below ground, to –0.094 volts.  
Clearly this is not possible in a single supply environment. Con-  
sequently this instrumentation amplifier configuration’s input  
common-mode voltage cannot go below about 0.4 volts. In  
comparison, the AMP04 has no such restriction. Its inputs will  
function with a zero-volt common-mode voltage.  
+10.00V  
A
R
100k  
R
R
+5V  
10.01  
V
OA  
200Ω  
50µA  
V
OB  
100k  
+15.01V  
R
B
+10.01V  
100k  
R
GAIN  
IN(–)  
IN(+)  
1
V
2
3
8
OUT  
Figure 3. Gain = 1001, Three Op Amp Instrumentation  
Amplifier  
INPUT BUFFERS  
6
11k  
100k  
0.1µA  
+15V  
11k  
+10.00V  
–
100Ω  
+10.01V  
100µA  
VOUT  
+10V  
100k  
REF  
+10.01V  
+
+15V  
5
–15V  
11k  
100.1µA  
Figure 1. Functional Block Diagram  
+11.111V  
–15V  
11k  
0.01V  
+
V
V
OB  
OUT  
100k  
V
B
IN  
0V  
–
V
OA  
A
Figure 4. Gain = 1000, AMP04  
100k  
100k  
20k  
20k  
–.094V  
0.01V  
0V  
4.7µA  
4.7µA  
5.2µA  
2127Ω  
Figure 2. Gain = 100 Instrumentation Amplifier  
–6–  
REV. A  
1...3456789...16

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