AD693AE

Series:	--
Packaging:	Tube
Part Status:	Active
Type:	Signal Conditioner
Input Type:	Voltage
Output Type:	Voltage
Interface:	3-Wire
Current - Supply:	20mA
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	20-CLCC
Supplier Device Package:	20-LCCC
Base Part Number:	AD693

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AD693AE Application Field and Working Principle

The AD693AE is a precision instrumentation amplifier (IAMP) commonly used in a wide range of industrial and commercial process control applications. It is a high accuracy, low noise design that offers a wide range of features and performance flexibility. This application article will cover the AD693AE\'s application field, its detailed working principle, and recommendations to optimize its performance.

Application Field

The AD693AE is a general-purpose IAMP used in a variety of applications ranging from light-industrial monitoring to high-precision systems in laboratories, aerospace, and the military. Typical applications involve transducer measurements and transducer bridges, bridge balance amplifiers, high-precision ratiometers, and error-sensing amplifiers. The AD693AE has an input common-mode range which covers ground to as well as a choice of low output impedance (20 Ohms or 40 Ohms).Its precision and design allow for the sensing of temperature, pressure, mechanical displacement, acceleration, and a variety of other physical input signals. Its high accuracy, low distortion characteristics make it exemplary for medical and laboratory applications.

Working Principle

The AD693AE employs a three-op-amp configuration. The first op-amp is the in-amp. The in-amp acts as a buffer to the transducer or bridge, to isolate it from the load impedance. The second op-amp is a differential amplifier which amplifies the signal. The third op-amp is a current-to-voltage converter which converts the amplified signal into a voltage output.The main features of the AD693AE are its exceptionally low input offset voltage (VOS), its gain-error, and its distortion. The VOS is guaranteed to be less than 35uV and the low-gain errors of the IAMP allows precision circuitry to be implemented. For example, the transducer bridges can be accurately balanced by offsetting the input signals.

Optimization Tips for AD693AE

To optimize performance a few guidelines should be followed. First, the supply voltage should be sufficient to power the amplifier (4V for a 5V supply) and adequate decoupling should be used. If surge protection is needed the AD693AE offers low DC offset in the presence of surge voltages.Another consideration is the input range of the IAMP. The input common-mode range should be much lower than the rated supply voltage. If a transducer bridge is used, the bridge will have to be balanced to ensure its full performance capability.Lastly, the output impedance should be taken into consideration. The output impedance can be selected to ensure better noise isolation when connecting to external circuits.In conclusion, the AD693AE is a precision IAMP, with low distortion and gain-error, used in a wide range of applications. It is important to consider the features of the AD693AE when selecting your IAMP, as well as adding in optimization guidelines to ensure its performance is maximized.

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