Datasheet
Table Of Contents
V
OUT
R = 10kW
P
500 Am
OPA363
OPA364
V
IN
V+ = +5V
Op Amp
Negative
Supply
Grounded
-V = 5V-
(Additional
Negative Supply)
5kW
OPAx363
10mA max
V+
V
IN
V
OUT
I
OVERLOAD
OPA363, OPA2363
OPA364, OPA2364, OPA4364
www.ti.com
SBOS259C –SEPTEMBER 2002–REVISED MAY 2013
INPUT AND ESD PROTECTION
All OPA363 and OPA364 pins are static protected with internal ESD protection diodes tied to the supplies. These
diodes will provide overdrive protection if the current is externally limited to 10mA, as stated in the absolute
maximum ratings and shown in Figure 24.
Figure 24. Input Current Protection
ACHIEVING OUTPUT SWING TO THE OP AMP’S NEGATIVE RAIL
Some applications require an accurate output voltage swing from 0V to a positive full-scale voltage. A good
single supply op amp may be able to swing within a few mV of single supply ground, but as the output is driven
toward 0V, the output stage of the amplifier will prevent the output from reaching the negative supply rail of the
amplifier.
The output of the OPA363 or OPA364 can be made to swing to ground, or slightly below, on a single supply
power source. To do so requires use of another resistor and an additional, more negative power supply than the
op amp’s negative supply. A pulldown resistor may be connected between the output and the additional negative
supply to pull the output down below the value that the output would otherwise achieve as shown in Figure 25.
Figure 25. OPA363 and OPA364 Swing to Ground
This technique will not work with all op amps. The output stage of the OPA363 and OPA364 allows the output
voltage to be pulled below that of most op amps, if approximately 500μA is maintained through the output stage.
To calculate the appropriate value load resistor and negative supply, RL = –V/500μA. The OPA363 and OPA364
have been characterized to perform well under the described conditions, maintaining excellent accuracy down to
0V and as low as –10mV. Limiting and nonlinearity occur below –10mV, with linearity returning as the output is
again driven above –10mV.
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Product Folder Links: OPA363 OPA2363 OPA364 OPA2364 OPA4364