OPA333_17 Datasheet, PDF (14/42 Pages) Texas Instruments – 1.8-V, microPower, CMOS Operational Amplifiers, Zero-Drift Series

OPA333, OPA2333
SBOS351E – MARCH 2006 – REVISED DECEMBER 2015
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Feature Description (continued)
The OPA333 and OPA2333 have an output stage that allows the output voltage to be pulled to the negative
supply rail, or slightly below, using the technique previously described. This technique only works with some
types of output stages. The OPA333 and OPA2333 are characterized to perform with this technique; the
recommended resistor value is approximately 20 kΩ.
NOTE
This configuration increases the current consumption by several hundreds of microamps.
Accuracy is excellent down to 0 V and as low as –2 mV. Limiting and nonlinearity occur below –2 mV, but
excellent accuracy returns after the output is again driven above –2 mV. Lowering the resistance of the pulldown
resistor allows the operational amplifier to swing even further below the negative rail. Resistances as low as
10 kΩ can be used to achieve excellent accuracy down to –10 mV.
7.3.5 DFN Package
The OPA2333 is offered in an DFN-8 package (also known as SON). The DFN is a QFN package with lead
contacts on only two sides of the bottom of the package. This leadless package maximizes board space and
enhances thermal and electrical characteristics through an exposed pad.
DFN packages are physically small, have a smaller routing area, improved thermal performance, and improved
electrical parasitics. Additionally, the absence of external leads eliminates bent-lead issues.
The DFN package can be easily mounted using standard PCB assembly techniques. See Application Reports
SLUA271, QFN/SON PCB Attachment and SCBA017, Quad Flatpack No-Lead Logic Packages, both are
available for download at www.ti.com.
NOTE
The exposed leadframe die pad on the bottom of the package should be connected to V–
or left unconnected.
7.4 Device Functional Modes
The OPAx333 device has a single functional mode. The device is powered on as long as the power supply
voltage is between 1.8 V (±0.9 V) and 5.5 V (±2.75 V).
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