LMC6081 datasheet(6/12 Pages) NSC | Precision CMOS Single Operational Amplifier

6 page

Typical Performance Characteristics V

S = ±7.5V, TA = 25˚C, Unless otherwise

specified (Continued)

Applications Hints

AMPLIFIER TOPOLOGY

The LMC6081 incorporates a novel op-amp design topology

that enables it to maintain rail-to-rail output swing even when

driving a large load. Instead of relying on a push-pull unity

gain output buffer stage, the output stage is taken directly

from the internal integrator, which provides both low output

impedance and large gain. Special feed-forward compensa-

tion design techniques are incorporated to maintain stability

over a wider range of operating conditions than traditional

micropower op-amps. These features make the LMC6081

both easier to design with, and provide higher speed than

products typically found in this ultra-low power class.

COMPENSATING FOR INPUT CAPACITANCE

It is quite common to use large values of feedback resis-

tance for amplifiers with ultra-low input current, like the

LMC6081.

Gain and Phase

Response vs Capacitive Load

with R

L = 600Ω

DS011423-27

Gain and Phase

Response vs Capacitive Load

with R

L = 500 kΩ

DS011423-28

Open Loop

Frequency Response

DS011423-29

Inverting Small Signal

Pulse Response

DS011423-30

Inverting Large Signal

Pulse Response

DS011423-31

Non-Inverting Small

Signal Pulse Response

DS011423-32

Non-Inverting Large

Signal Pulse Response

DS011423-33

Stability vs Capacitive

Load, R

L = 600Ω

DS011423-34

Stability vs Capacitive

Load R

L = 1MΩ

DS011423-35

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