OPA350 datasheet(13/44 Pages) TI2

13 / 44 page

S = +5, G = +1, RL = 1kΩ

OUT

OPA350, OPA2350, OPA4350

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SBOS099D – SEPTEMBER 2000 – REVISED DECEMBER 2015

Feature Description (continued)

Figure 25. Rail-to-Rail Input and Output

7.3.1 Operating Voltage

OPA350 series operational amplifiers are fully specified from 2.7 V to 5.5 V. Supply voltage may range from 2.5

V to 5.5 V. Parameters are tested over the specified supply range: a feature of the OPA350 series. In addition,

many specifications apply from

−40°C to 85°C. Most behavior remains virtually unchanged throughout the full

operating voltage range. Parameters that vary significantly with operating voltage or temperature are shown in

Typical Characteristics.

7.3.2 Rail-to-Rail Input

The tested input common-mode voltage range of the OPA350 series extends 100 mV beyond the supply rails.

This is achieved with a complementary input stage: an N-channel input-differential pair in parallel with a P-

channel differential pair, as shown in Figure 26. The N-channel pair is active for input voltages close to the

positive rail, typically (V+) – 1.8 V to 100 mV above the positive supply, while the P-channel pair is on for inputs

from 100 mV below the negative supply to approximately (V+) – 1.8 V. There is a small transition region, typically

(V+) – 2 V to (V+) – 1.6 V, in which both pairs are on. This 400-mV transition region can vary ±400 mV with

process variation. Thus, the transition region (both input stages on) can range from (V+) – 2.4 V to (V+) – 2 V on

the low end, up to (V+) – 1.6 V to (V+) – 1.2 V on the high end.

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OPA350 Datasheet(PDF) 13 Page - Texas Instruments