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.