ADA4177系列在精密耐用型运算放大器应用中的优势

　　The ADA4177 family is composed of low noise， low bias current op amps with overvoltage and

　　electromagnetic interference （EMI） protection. With single， dual， and quad versions， they all offer

　　±32 V input over voltage protection （OVP） on-chip， leading to a reduced bill of materials cost and

　　board space by eliminating the need for external OVP discretes.

　　With the dual advantage of simplifying system design and making the end system easier to pass EMI

　　susceptibility testing by including integrated EMI filtering on inputs， the parts meet an impressive

　　70 dB of rejection at 1000 MHz.

　　For precision instrumentation， end systems can be made smaller due to the integrated OVP and

　　EMI. There is no need to calibrate the system over time or temperature change leading to increased

　　uptime and reduced cost of ownership. This is due to the ultralow offset voltage and drift specifications.

　　For the ultimate end system precision and linearity， features such as the rail-to-rail output

　　adds value for designers that need additional dynamic range to measure the smallest level signals.

　　Low noise performance complemented by excellent dc precision and ac accuracy specifications

　　minimize the need for design trade-offs， especially for small form factor end systems where low

　　power dissipation is needed.

　　For process control sensor interfaces such as thermocouples， RTDs， and strain gages， the sensor may be off board exposing the op amp inputs to

　　overvoltage and EMI. Therefore， the on-chip robust protection is a key advantage in space constrained modules. The ADA4177 family robust inputs

　　combined with low supply current and consistent specification over a wide range allows them to be used as input module front-end amplifiers with

　　signal swings compatible to industry standards， and especially for small form factor， USB-powered applications where low power and small

　　packages are critical.

　　The drive for increased productivity within all industrial environments is driving PCL and DCS systems to incorporate more and more channels to

　　facilitate more process node monitoring. The multichannel versions lead to greater efficiencies within the end system， which ultimately lower the

　　cost of the system and simplify design.