OFFSET VOLTAGE vs COMMON MODE VOLTAGE

200

150

100

50

0

−50

−150

−100

−200

−2

−3

Common Mode Voltage (V)

3

−1

0

1

2

V =

S

±2.75V

OPA365

Competitors

Regulated

Charge Pump

V

Patent Pending

Very Low Ripple

Topology

I

B IA S

V

I

BI AS

I

BI AS

I

B IA S

V

S

I

B IA S

V

O U T

V

V

OPA365-EP

SLOS735

– AUGUST 2011

www.ti.com

Rail-to-Rail Input

The OPA365 features true rail-to-rail input operation, with supply voltages as low as

±1.1 V (2.2 V). A unique

zero-crossover input topology eliminates the input offset transition region typical of many rail-to-rail,

complementary stage operational amplifiers. This topology also allows the OPA365 to provide superior

common-mode performance over the entire input range, which extends 100 mV beyond both power-supply rails,

as shown in Figure 5. When driving ADCs, the highly linear VCM range of the OPA365 assures that the op

amp/ADC system linearity performance is not compromised.

Figure 5. OPA365 has Linear Offset Over the Entire Common-Mode Range

A simplified schematic illustrating the rail-to-rail input circuitry is shown in Figure 6.

Figure 6. Simplified Schematic

10

Submit Documentation Feedback

Copyright

© 2011, Texas Instruments Incorporated

Product Folder Link(s): OPA365-EP