LMC6081 Datasheet, PDF (9/21 Pages) National Semiconductor (TI) – Precision CMOS Single Operational Amplifier

LMC6081
www.ti.com
SNOS649C – AUGUST 2000 – REVISED MARCH 2013
Typical Performance Characteristics (continued)
V_S = ±7.5V, T_A = 25°C, Unless otherwise specified
Non-Inverting Large
Signal Pulse Response
Stability
vs
Capacitive
Load, R_L = 600Ω
Figure 21.
Stability
vs
Capacitive
Load R_L = 1 MΩ
Figure 22.
Figure 23.
APPLICATION INFORMATION
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 compensation 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 resistance for amplifiers with ultra-low input current, like the
LMC6081.
Although the LMC6081 is highly stable over a wide range of operating conditions, certain precautions must be
met to achieve the desired pulse response when a large feedback resistor is used. Large feedback resistors and
even small values of input capacitance, due to transducers, photodiodes, and circuit board parasitics, reduce
phase margins.
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