- -43%
Millivolt/mikrovoltos feszültségerősítő Jelerősítő AD623/AD620 műszererősítő modul
Millivolt/mikrovoltos feszültségerősítő Jelerősítő AD623/AD620 műszererősítő modul
447 Ft
43% megtakarítás
785 Ft
Nincs adó
Millivolt AD623/AD620 instrument amplifier module
Product Description:
Dedicated instrumentation amplifier core, track-to-rail output, high input impedance, high common mode rejection ratio, low misalignment and drift, low noise, and high closed-loop gain stability, perfect for precision measurement/amplification.
The module features
1. High-end special instrument amplifier AD623 core, high precision, good linearity.
2. Single power supply, support 3-5.5V power supply, easy to use!
3. Integrated negative pressure generator module, dual power supply operation, easy to deal with negative/AC signals.
Power input LC filter, pure and stable, to ensure the stability of signal amplification.
5. Built-in negative voltage generation module, only need single power supply can operate double power supply, simplify system design.
Rail to rail output, output swing up to -VCC, far more than LM358/AD620 and other core products (only up to VCC-1.5V)
7. 2-1000 times magnification is adjustable, adapted to different applications, the import of American bounds potentiometer, resistance change even, stable resistance value, up to 10 times higher than the price domestic potentiometer (inferior potentiometer is loose, open circuit, beating, often lead to resistance when the small, open circuit and so on, can't guarantee the stability of magnification, and it will be difficult to guarantee accuracy).
7. Simple module, strong expansibility, detailed description, convenient secondary development.
The main parameters
Amplifier type: dedicated instrumentation amplifier AD623 core
Input range: 0.5VCC (i.e. the voltage between S /S- is less than half of the supply voltage).
Output range: -vcc (rail to rail)
Magnification: 2-1000 times adjustable.
Power consumption: 150uA (typical) 650uA ()
Power supply: 3-5.5V
Gain accuracy: 0.35% (G>2)
Input offset voltage: 100-200UV
Input offset drift :1uv/℃
Common mode rejection ratio: 90db
Gain bandwidth: 800KHZ.
PCB size: 40*23mm
Pin description and wiring diagram
It is recommended to use a smaller magnification (such as 50/100 times) to test the baby and then adjust it to the desired magnification. Adjust the A knob clockwise to increase the magnification (1000 times), when adjusted, you can hear the potentiometer issued a slight click, that is, has been adjusted to the end. A resistor can also be used to fix the magnification so that the value is more stable
Matters needing attention
1. Some people call REF as zero pin, so there is no problem, but the AD623 core has high precision, directly grounding the REF, the output is very close to 0, no actual adjustment. It is recommended to adjust the REF pin voltage only when translation voltage is required
2. The store uses the imported American bounds potentiometer, which has uniform adjustment, stability and high reliability. The price is 10 times higher than the domestic potentiometer, which is not generally comparable to the domestic potentiometer.
3. The offset voltage of AD623 is 200UV, that is, 200UV error may be generated on the input voltage. Therefore, if the input voltage is smaller, the initial error will be larger, and it is suggested that the signal should not be lower than 3mV.
4. The 3dB gain bandwidth of AD623 is 800KHZ, that is, gain multiple * frequency =800KHZ. Therefore, if the DC signal is amplified, it can reach about 1,000 times. If the amplification is 800 times, the signal should not be higher than 1KHZ. If the amplification is 10 times, the signal should not be higher than 80KHZ, and so on. The higher the signal frequency is, the greater the amplification loss is.
5. The adjustment range of the REF end should not be too large, otherwise the magnification will be affected.
6. The output voltage range of the amplifier is controlled by the supply voltage. Our AD623 module has a linear range of -VCC. When the AD620/LM358 amplifier is supplied with 5V and -5V, the linearity is only between -3.6V and 3.6V.
7. The REF pin of the AD623 can only pull up/down the output voltage. Ground in general. When a REF pin is used to raise or lower the output, the voltage of the pin can be changed. But in this case, it should be noted that the linear region of magnification will not change because of the change of pin 5, and its output will not exceed VCC.
General knowledge of instrument Amplifiers
All kinds of non-electric measurement, usually converted into voltage (or current) signal by the sensor, the voltage signal is generally weak, small to 0.1μV, and the dynamic range is wide, often have a large common mode interference voltage. Therefore, in the sensor behind most of the need to connect instrumentation amplifier, the main role is to sensor signal precision voltage amplification, while the common mode interference signal suppression, to improve the quality of the signal.
In the application of signal amplification, differential amplifier circuit is usually needed to collect the signal after amplification. However, the precision of the basic differential amplifier circuit is poor, and the resistance matching problem is the main factor affecting the common mode rejection ratio. If the discrete operational amplifier is used as the measurement circuit, it is inevitable that there will be resistance differences, which will affect the signal amplification more complicated, resulting in the reduction of common mode rejection ratio and gain nonlinearity. The integrated instrument amplifier made by post-mold technology solves the above matching problems, but the instrument amplifier circuit has no above shortcomings, so it is widely used.
Due to the sensor output impedance is generally high, the output voltage amplitude is small, coupled with poor working conditions, therefore, compared with general general amplifier instrument amplifier, has its special requirements, mainly displays in the high input impedance, high common mode rejection ratio, low disturbance and drift, low noise, and high stability of the closed-loop gain, etc.
General integrated instrument amplifiers have the following characteristics
(1) High input impedance, generally higher than 109 ω
(2) Low bias current
(3) High common mode rejection ratio
(4) balanced differential input
(5) Good temperature characteristics
(6) Gain adjustable
(7) Single-end input
Product Description:
Dedicated instrumentation amplifier core, track-to-rail output, high input impedance, high common mode rejection ratio, low misalignment and drift, low noise, and high closed-loop gain stability, perfect for precision measurement/amplification.
The module features
1. High-end special instrument amplifier AD623 core, high precision, good linearity.
2. Single power supply, support 3-5.5V power supply, easy to use!
3. Integrated negative pressure generator module, dual power supply operation, easy to deal with negative/AC signals.
Power input LC filter, pure and stable, to ensure the stability of signal amplification.
5. Built-in negative voltage generation module, only need single power supply can operate double power supply, simplify system design.
Rail to rail output, output swing up to -VCC, far more than LM358/AD620 and other core products (only up to VCC-1.5V)
7. 2-1000 times magnification is adjustable, adapted to different applications, the import of American bounds potentiometer, resistance change even, stable resistance value, up to 10 times higher than the price domestic potentiometer (inferior potentiometer is loose, open circuit, beating, often lead to resistance when the small, open circuit and so on, can't guarantee the stability of magnification, and it will be difficult to guarantee accuracy).
7. Simple module, strong expansibility, detailed description, convenient secondary development.
The main parameters
Amplifier type: dedicated instrumentation amplifier AD623 core
Input range: 0.5VCC (i.e. the voltage between S /S- is less than half of the supply voltage).
Output range: -vcc (rail to rail)
Magnification: 2-1000 times adjustable.
Power consumption: 150uA (typical) 650uA ()
Power supply: 3-5.5V
Gain accuracy: 0.35% (G>2)
Input offset voltage: 100-200UV
Input offset drift :1uv/℃
Common mode rejection ratio: 90db
Gain bandwidth: 800KHZ.
PCB size: 40*23mm
Pin description and wiring diagram
It is recommended to use a smaller magnification (such as 50/100 times) to test the baby and then adjust it to the desired magnification. Adjust the A knob clockwise to increase the magnification (1000 times), when adjusted, you can hear the potentiometer issued a slight click, that is, has been adjusted to the end. A resistor can also be used to fix the magnification so that the value is more stable
Matters needing attention
1. Some people call REF as zero pin, so there is no problem, but the AD623 core has high precision, directly grounding the REF, the output is very close to 0, no actual adjustment. It is recommended to adjust the REF pin voltage only when translation voltage is required
2. The store uses the imported American bounds potentiometer, which has uniform adjustment, stability and high reliability. The price is 10 times higher than the domestic potentiometer, which is not generally comparable to the domestic potentiometer.
3. The offset voltage of AD623 is 200UV, that is, 200UV error may be generated on the input voltage. Therefore, if the input voltage is smaller, the initial error will be larger, and it is suggested that the signal should not be lower than 3mV.
4. The 3dB gain bandwidth of AD623 is 800KHZ, that is, gain multiple * frequency =800KHZ. Therefore, if the DC signal is amplified, it can reach about 1,000 times. If the amplification is 800 times, the signal should not be higher than 1KHZ. If the amplification is 10 times, the signal should not be higher than 80KHZ, and so on. The higher the signal frequency is, the greater the amplification loss is.
5. The adjustment range of the REF end should not be too large, otherwise the magnification will be affected.
6. The output voltage range of the amplifier is controlled by the supply voltage. Our AD623 module has a linear range of -VCC. When the AD620/LM358 amplifier is supplied with 5V and -5V, the linearity is only between -3.6V and 3.6V.
7. The REF pin of the AD623 can only pull up/down the output voltage. Ground in general. When a REF pin is used to raise or lower the output, the voltage of the pin can be changed. But in this case, it should be noted that the linear region of magnification will not change because of the change of pin 5, and its output will not exceed VCC.
General knowledge of instrument Amplifiers
All kinds of non-electric measurement, usually converted into voltage (or current) signal by the sensor, the voltage signal is generally weak, small to 0.1μV, and the dynamic range is wide, often have a large common mode interference voltage. Therefore, in the sensor behind most of the need to connect instrumentation amplifier, the main role is to sensor signal precision voltage amplification, while the common mode interference signal suppression, to improve the quality of the signal.
In the application of signal amplification, differential amplifier circuit is usually needed to collect the signal after amplification. However, the precision of the basic differential amplifier circuit is poor, and the resistance matching problem is the main factor affecting the common mode rejection ratio. If the discrete operational amplifier is used as the measurement circuit, it is inevitable that there will be resistance differences, which will affect the signal amplification more complicated, resulting in the reduction of common mode rejection ratio and gain nonlinearity. The integrated instrument amplifier made by post-mold technology solves the above matching problems, but the instrument amplifier circuit has no above shortcomings, so it is widely used.
Due to the sensor output impedance is generally high, the output voltage amplitude is small, coupled with poor working conditions, therefore, compared with general general amplifier instrument amplifier, has its special requirements, mainly displays in the high input impedance, high common mode rejection ratio, low disturbance and drift, low noise, and high stability of the closed-loop gain, etc.
General integrated instrument amplifiers have the following characteristics
(1) High input impedance, generally higher than 109 ω
(2) Low bias current
(3) High common mode rejection ratio
(4) balanced differential input
(5) Good temperature characteristics
(6) Gain adjustable
(7) Single-end input
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