The TLV2211, TLV2221, and TLV2231 are TI's newest low voltage rail-to-rail op amps, and the latest addition to a growing line of ultra-small "SOT-23" analog products. This new family of op amps lets designers trade power consumption and speed for the best performance in low voltage applications, and offer significantly improved output drive over earlier generations of rail-to-rail op amps.
The TLV2211 is a single micropower op amp for battery-powered
dc applications where power consumption is critical. Quiescent
current at 3 V is only 11 µA (typ); at 5 V, it's just 13
µA. And it's the lowest noise SOT-23 micropower op amp available:
its 3-V noise floor is 22 nV/Hz - a fifth of the nearest competitor's
micropower SOT-23 op amps.
The TLV2231 has 2 MHz bandwidth and 1.6 V/µs slew rate (VDD = 5 V) for applications requiring better ac response. Yet it still consumes just 850 µA (typ) supply current. The TLV2231 can drive 600- loads, and has the lowest noise floor of the three devices:
The TLV2221 offers designers a compromise between the ac performance and output drive of the TLV2231 and the micropower TLV2211 (see table for comparison). All three op amps are rated for operation from 2.7 V to 10 V, and fully specified and characterized at both VDD = 3 V and 5 V.
The ultra-small SOT-23 package lets designers place single amplifiers very near the signal source, minimizing noise pick-up from long PCB traces. Furthermore, amplifiers can be built right into sensors or squeezed into tightly packed layouts. The pinout is optimized for signal isolation, component placement, and PCB layout (see illustration):
Vol 18, August, 1996
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