Output Swing Includes Both Supply Rails

Low Noise . . . 19 nV/√Hz Typ at f = 1 kHz

Low Input Bias Current . . . 1 pA Typ

Fully Specified for Single-Supply 3-V and

5-V Operation

Very Low Power . . . 110 μA Typ

Common-Mode Input Voltage Range

Includes Negative Rail

Wide Supply Voltage Range

2.7 V to 10 V

Macromodel Included

description

The TLV2221 is a single low-voltage operational amplifier available in the SOT-23 package. It offers a

compromise between the ac performance and output drive of the TLV2231 and the micropower TLV2211.

It consumes only 150 μA (max) of supply current and is ideal for battery-powered applications. The device

exhibits rail-to-rail output performance for increased dynamic range in single- or split-supply applications. The

TLV2221 is fully characterized at 3 V and 5 V and is optimized for low-voltage applications.

The TLV2221, exhibiting high input impedance and low noise, is excellent for small-signal conditioning for

high-impedance sources, such as piezoelectric transducers. Because of the micropower dissipation levels

combined with 3-V operation, these devices work well in hand-held monitoring and remote-sensing

applications. In addition, the rail-to-rail output feature with single or split supplies makes this family a great

choice when interfacing with analog-to-digital converters (ADCs).

With a total area of 5.6mm2, the SOT-23 package only requires one third the board space of the standard 8-pin

SOIC package. This ultra-small package allows designers to place single amplifiers very close to the signal

source, minimizing noise pick-up from long PCB traces. TI has also taken special care to provide a pinout that

is optimized for board layout (see Figure 1). Both inputs are separated by GND to prevent coupling or leakage

paths. The OUT and IN? terminals are on the same end of the board to provide negative feedback. Finally, gain

setting resistors and decoupling capacitor are easily placed around the package.