DIFF-AMP
Difference amplifier
Produces an analogue output related to the difference between two input signals with the documented gain/reference arrangement.
Schematic
Symbols · INA
Instrumentation amplifier
Amplifies a differential input signal using an instrumentation-amplifier input and gain arrangement.
Schematic · INA
What it represents
Amplifies a differential input signal using an instrumentation-amplifier input and gain arrangement.
On a schematic, identify the two measurement inputs, gain-setting terminals and output reference and trace the conditioned measurement signal and receiving converter. Keep the component tag and signal/reference names consistent across the control drawing, terminal schedule and device documentation.
An instrumentation amplifier and a basic difference amplifier have different input and gain arrangements; the selected device defines their capabilities.
Terminal letters describe electrical roles, not package pin numbers. Check the selected public datasheet for the actual pin assignment, polarity and any internally connected terminals before completing the drawing.
How to read it
- Identify the two measurement inputs, gain-setting terminals and output reference.
- Trace the conditioned measurement signal and receiving converter.
Information to show or reference
- Label the two measurement inputs, gain-setting terminals and output reference.
- Cross-reference the conditioned measurement signal and receiving converter.
- Add the selected device or circuit documentation revision, power/reference connections and project signal convention.
A distinction that matters
An instrumentation amplifier and a basic difference amplifier have different input and gain arrangements; the selected device defines their capabilities.
Sources you can follow
These public references support the explanation and provide further detail. Their graphics and downloadable files remain with their publishers.
AD620 — instrumentation amplification
Public primary manufacturer documentation establishes the component function or circuit/topology relationship. Preview geometry and drafting explanations are independently authored.
About this graphic
This illustration was authored independently by Elora Grid to explain the concept. It is not reproduced from a customer drawing, an official standard graphic or a manufacturer CAD file. Its correspondence to an exact IEC or IEEE symbol identifier has not been certified.
SVG and DXF downloads contain this original artwork. DXF uses unscaled drawing units; a GA envelope supplies no product dimensions, clearances or fabrication information. Original artwork is available under CC BY 4.0. Third-party references retain their own terms.
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