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Operational amplifiers are used throughout electronic circuits. The reality is that it is difficult to reuse them because the required specifications differ depending on the purpose. On the other hand, in recent years, an increasing number of companies are working on standardizing parts in order to reduce costs, optimize inventory, and reduce procurement risks. An increasing number of people are probably looking for a versatile operational amplifier that can be used for a variety of purposes.
This time, we will introduce the ADA4510-2 operational amplifier, which boasts outstanding versatility and can be used in a variety of circuits. Please read this if you are interested in high-precision, low-cost, all-purpose operational amplifiers.
ADA4510-2 is an almighty operational amplifier that can be used in any situation.
Op-amps are important electronic components used in various places in circuits. The required specifications vary depending on the application. For example, precision is critical when amplifying small sensor signals in advanced instrumentation applications. Alternatively, when used as a buffer before and after A/D conversion of high-speed signals, low noise and support for high-speed signals are required.
Generally, there are trade-offs in op amp performance. Improving the performance of certain items comes at the expense of others. If there were an ideal operational amplifier that met all requirements at the same time, the same operational amplifier could be used in a variety of circuits, but in reality such a perfect operational amplifier does not exist.
The ideal and reality of operational amplifiers
|
|
ideal |
reality |
| input impedance |
∞=zero input current |
very high but finite |
| Output impedance |
zero |
Several tens of ohms |
| Input dynamic range |
∞ |
Restricted by power supply and GND |
| open loop voltage gain |
∞ |
104～105 |
| frequency band |
∞ |
Several 100kHz to several 10MHz |
| Input offset voltage |
zero |
A few mV |
| Common mode input voltage rejection ratio |
∞ |
expensive but limited |
| internal noise |
zero |
Several nV/√Hz to several tens of nV/√Hz (thermal noise area) |
Therefore, different types of op amps need to be selected for different circuits. As a result, the number of parts increased, leading to issues such as ``increasing management costs,'' ``increasing volume costs due to small quantities and high variety,'' and ``increasing procurement risk due to diversification of procurement sources.'' .
Analog Devices' high-precision general-purpose operational amplifier "ADA4510-2"
We recommend Analog Devices' high-precision general-purpose operational amplifier `` ADA4510-2'' for those who are having trouble with these issues. Analog Devices' proprietary DigiTrim® technology provides extremely low offset voltage (±20μV max.). Other specs are generally of a high standard, making it an unprecedented, versatile operational amplifier. Since it can be used for a wide range of applications, it is ideal for standardizing operational amplifiers.
By standardizing parts, quantities can be reduced and volume costs can be expected to be reduced.
Main specs
-Offset voltage: ±20μV max (@25℃)
-Offset voltage drift: 70nV/℃ typ
-Input current bias: 10pA max (@25℃)
-1/f noise: 1μVp-p typ (0.1 to 10Hz)
-Noise density: 5nV/√Hz typ (@1kHz)
-Gain bandwidth: 10.4MHz typ
-Slew rate: 19V/μs typ
-Rail to rail: Yes for both input and output
-Power supply voltage range: 6V to 40V
Specifically, what kind of circuits can it be used in? Below is an example.
Application example of ADA4510-2
- sensor input stage
- multiplexer output stage
- Data acquisition
- active filter
- High precision reference buffer
- D/A converter buffer
We will introduce the advantages of ADA4510-2 in each application.
sensor input stage
First, use it at the sensor input stage. The operational amplifier used in this application is required to receive the minute analog signal from the sensor and amplify it accurately. Therefore, it is important that the error component is small.
The ADA4510-2 combines low offset voltage (± 20 μV max.), low offset voltage drift (70nV/ °C typ.), and low input bias current (10pA max. @25 °C). It is possible to amplify sensor signals with high precision.
・Offset voltage: ±20μV max
・Offset drift: 70nV/℃ typ
・Input bias current: 10pA max (@25℃)
Amplify sensor signals with high precision
multiplexer output stage
Next is its use in the multiplexer output stage. Here, it is required to quickly follow the signal from the sensor when it is switched by the multiplexer. Therefore, a high slew rate is required.
The ADA4510-2 combines high slew rate (19V/ μs typ.), low offset voltage drift (70nV/°C typ.), and input/output rail-to-rail characteristics. It also supports high-speed switching and achieves accurate signal amplification.
・Slew rate: 19V/μsec typ
・Offset drift: 70nV/℃ typ
・I/O rail to rail
high-speed switchingCan support
Data acquisition
Next is its use in data acquisition. This requires noise performance that does not compromise data accuracy and gain bandwidth that can support high-speed signal frequencies.
The ADA4510-2 has low noise (1/f noise = 1 μV pp typ.(0.1 to 10Hz), Noise Density = 5nV/ √ Hz typ.(@1kHz)) and wide gain bandwidth (10.4 MHz typ. .) I have. Data acquisition with high accuracy and high sampling speed can be achieved.
・1/f noise: 1μVp-p typ (0.1 to 10Hz)
・Noise density: 5nV/√Hz typ (@1kHz)
・Band width: 10.4MHz
high accuracy and high sampling speedCapable of acquiring data with
active filter
The next step is to use it as an active filter. This application requires low input bias current to maintain signal accuracy. Gain bandwidth is also important to accommodate various frequencies.
The ADA4510-2 has low input bias current (10pA max. @25 °C) and wide gain bandwidth (10.4 MHz typ.). This operational amplifier is easy to use as an active filter because it can handle a wide range of frequencies.
・Bias current: 10pA max (@25℃)
・Band width: 10.4MHz typ
a wide range of frequencies is possibleFilter design for
High precision reference buffer
Next, use it as a high-precision reference buffer. Maintaining an accurate reference voltage requires performance against offset voltage and offset voltage drift.
The ADA4510-2 features low offset voltage (± 20μV max.) and low offset voltage drift (70nV/°C typ.), allowing stable operation of the reference voltage.
・Offset voltage: ±20μV max
・Offset drift: 70nV/℃ typ
Stable operation of reference voltage
D/A converter buffer
Finally, when using it as a D/A converter buffer. Here, in order to correctly amplify the output signal from the D/A converter, it is required to have high monotonic increase and low error.
The ADA4510-2 has high monotonicity, low offset voltage (± 20μV max.), and low offset voltage drift (70nV/°C typ.). High precision signal output can be achieved without losing signal information.
・Monotonicity
・Offset voltage: ±20μV max
・Offset drift: 70nV/℃ typ
High precision signal output
Contribute to cost reduction by standardizing parts
Up to this point, we have introduced examples of circuits in which the ADA4510-2 can be used. I hope this has conveyed the appeal of the versatile ADA4510-2.
The figure below is a circuit diagram using the ADA4510-2 for the sensor input stage, multiplexer output stage, and reference buffer.
In this way, operational amplifiers for various applications can be used in common with the ADA4510-2. Although the above example is just a small portion of the circuit, more circuits can be constructed using the ADA4510-2 in real-world applications. Of course, it is also possible to share them across applications.
By consolidating operational amplifiers, which had previously been selected individually, into the ADA4510-2, we can easily reduce the number of parts, reduce costs, and reduce procurement risks.
[Explanation] What is DigiTrim® technology?
Finally, let me introduce Analog Devices' proprietary trimming technology, DigiTrim® technology, which is also used in the ADA4510-2.
In recent years, electronic devices in general have become lower in voltage, and as the voltage tolerance range has narrowed, operational amplifiers are also required to have higher precision.
An important indicator for evaluating the accuracy of an operational amplifier is the "input offset voltage." Various trimming techniques are introduced to enhance its performance. In particular, many operational amplifier manufacturers have introduced "offset trimming," which individually adjusts the accuracy of ICs before shipping. However, the cost of offset trimming is added to the IC price. Offset trimming has not been common in general purpose op amps where price is a constraint.
Analog Devices' patented DigiTrim® technology enables trimming at approximately 30 % lower cost than traditional methods. This technology allows offset trimming to improve performance while maintaining the price of general-purpose operational amplifiers.
DigiTrim® technology is a technique used in many Analog Devices amplifiers that trims the offset voltage after the circuit is packaged. Trimming after package sealing has the advantage of correcting offset voltages that occur as individual differences due to mechanical stress during assembly.
DigiTrim® adjusts circuit performance by programming digital codes that act as current sources after the device is packaged. This trimming information is input via existing analog pins and can be readjusted to optimal accuracy. Once trimming is complete, the circuit is locked and the product is shipped, preventing accidental re-trimming by the end user. This eliminates the need for wafer-level trim testing, significantly reducing costs.
This time, we introduced Analog Devices' general-purpose operational amplifier ADA4510-2, which is useful in a variety of circuits. By using the high-precision, low-cost ADA4510-2, it is possible to easily standardize parts.
We can also provide samples. Please try once. If you are interested, please feel free to contact us.
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