Common Customer Problem: Op-Amp Output Voltage Swing

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By Marek Lis Sr Application Engineer Texas Instruments -Tucson

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Presentation transcript:

Common Customer Problem: Op-Amp Output Voltage Swing By Marek Lis Sr Application Engineer Texas Instruments -Tucson

Op Amp Output Range Consideration

REAL WORLD Outputs

Classic Output Stage Common-emitter output Current source driver Headroom set by VBE+VCESAT Unity Gain

OPA827 – Classic Output OPA827 OPA827

R-to-R Output Stage Common Collector or Common Drain Headroom set by VDSsat or VCEsat

R-to-R Output Stage Common Collector or Common Drain Headroom set by VCESAT Value of RLOAD affects AOL and Output Swing

MOSFET Characteristic Curves

Achieving Output Swing to the Negative Rail

SS Pull Down Cheat Sheet Part # Resistor Value OPA335 40 kΩ OPA340 7.5 kΩ OPA343 OPA348 250 kΩ OPA350 2 kΩ OPA353 OPA333 20 kΩ

Thank you Marek Lis lis_marek@ti.com