lmc6464amj-qml National Semiconductor Corporation, lmc6464amj-qml Datasheet - Page 17

• Manufacturer Part Number: lmc6464amj-qml
• Description: Lmc6464qml Quad Micropower, Rail-to-rail Input And Output Cmos Operational Amplifier
• Manufacturer: National Semiconductor Corporation

For single supply 5V operation, the output of the circuit will
swing from 0V to 5V. The voltage divider set up R
R
from 1.67V ( of 5V) to 3.33V ( of 5V). This voltage behaves
as the threshold voltage.
R
quency of oscillation, f
where Δt is the time the amplifier input takes to move from
1.67V to 3.33V. The calculations are shown below.
where τ = RC = 0.68 seconds
→
and
→
Then,
= 1 Hz
4
1
t
t
1
2
will cause the non-inverting input of the LMC6464 to move
and C
= 0.27 seconds.
= 0.75 seconds
1
determine the time constant of the circuit. The fre-
Osc
is
2
, R
3
and
17
LOW FREQUENCY NULL
Output offset voltage is the error introduced in the output volt-
age due to the inherent input offset voltage V
fier.
Output Offset Voltage = (Input Offset Voltage) (Gain)
In the above configuration, the resistors R
the nominal voltage around which the input signal, V
be symmetrical. The high frequency component of the input
signal V
nent will be nulled since the DC level of the output will be the
input offset voltage of the LMC6464 plus the bias voltage. This
implies that the output offset voltage due to the top amplifier
will be eliminated.
I
will be unaffected while the low frequency compo-
FIGURE 22. High Gain Amplifier
with Low Frequency Null
5
and R
OS
, of an ampli-
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6
determine
I
20160628
should