Input and esd protection the opa687 is built using a

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INPUT AND ESD PROTECTION The OPA687 is built using a very high speed complemen- tary bipolar process. The internal junction breakdown volt- ages are relatively low for these very small geometry de- vices. These breakdowns are reflected in the Absolute Maxi- mum Ratings table. All device pins are protected with internal ESD protection diodes to the power supplies as shown in Figure 10. External Pin +V CC –V CC Internal Circuitry These diodes provide moderate protection to input overdrive voltages above the supplies as well. The protection diodes can typically support 30mA continuous current. Where higher currents are possible (e.g., in systems with ± 15V supply parts driving into the OPA687), current-limiting series resis- tors should be added into the two inputs. Keep these resistor values as low as possible since high values degrade both noise performance and frequency response. FIGURE 10. Internal ESD Protection.
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