OPA180-Q1 Datasheet, PDF (18/32 Pages) Texas Instruments – 0.1-uV/C Drift, Low-Noise, Rail-to-Rail Output, 36-V, Zero-Drift Operational Amplifiers

OPA180-Q1, OPA2180-Q1
SBOS861 – MAY 2017
www.ti.com
Feature Description (continued)
When the operational amplifier connects into a circuit, the ESD protection components are intended to remain
inactive and not become involved in the application circuit operation. However, circumstances may arise whenan
applied voltage exceeds the operating voltage range of a given pin. If this condition occurs, there is a risk that
some of the internal ESD protection circuits may be biased on, and conduct current. Any current flow occurs
through ESD cells and rarely involves the absorption device.
If there is an uncertainty about the ability of the supply to absorb this current, external zener diodes may be
added to the supply pins. The zener voltage must be selected so the diode does not turn on during normal
operation.
However, the zener voltage must be low enough so that the zener diode conducts if the supply pin begins to rise
above the safe operating supply voltage level.
8.4 Device Functional Modes
The OPA180-Q1and OPA2180-Q1 devices are powered on when the supply is connected. These devices can
operate as a single-supply operational amplifier or dual-supply amplifier depending on the application. In single-
supply operation with V– at ground (0 V), V+ can be any value between 4 V and 36 V. In dual-supply operation,
the supply voltage difference between V– and V+ is from 4 V to 36 V. Typical examples of dual-supply
configuration are ±5 V, ±10 V, ±15 V, and ±18 V. However, the supplies must not be symmetrical. Less common
examples are V– at –3 V and V+ at 9 V, or V– at –16 V and V+ at 5 V. Any combination where the difference
between V– and V+ is at least 4 V and no greater than 36 V is within the normal operating capabilities of these
devices.
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