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Power Supplies

Input and ESD Protection

OPA698M

SGLS287A – MAY 2005 – REVISED MARCH 2006

The OPA698 is nominally specified for operation using either ±5-V supplies or a single +5-V supply. The

maximum specified total supply voltage of 12 V allows reasonable tolerances on the supplies. Higher supply

voltages can break down internal junctions, possibly leading to catastrophic failure. Single-supply operation is

possible as long as common-mode voltage constraints are observed. The common-mode input and output

voltage specifications can be interpreted as required headroom to the supply voltage. Observing this input and

output headroom requirement allows design of non-standard or single-supply operation circuits. Figure 48 shows

one approach to single-supply operation.

ESD damage has been known to damage MOSFET devices, but any semiconductor device is vulnerable to ESD

damage. This is particularly true for high-speed, fine geometry processes. ESD damage can cause subtle

changes in amplifier input characteristics without necessarily destroying the device. In precision operational

amplifiers, this may cause a noticeable degradation of offset voltage and drift. Therefore, ESD handling

precautions are required when handling the OPA698.

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