OPA350 Datasheet, PDF (13/40 Pages) Burr-Brown (TI) – High-Speed, Single-Supply, Rail-to-Rail OPERATIONAL AMPLIFIERS MicroAmplifier ™ Series

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Feature Description (continued)
5V
OPA350, OPA2350, OPA4350
SBOS099D – SEPTEMBER 2000 – REVISED DECEMBER 2015
V_S = +5, G = +1, R_L = 1kΩ
V_IN
0
5V
V_OUT
0
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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