LMC6462AIM National Semiconductor, LMC6462AIM Datasheet - Page 12
LMC6462AIM
Manufacturer Part Number
LMC6462AIM
Description
OP AMP, DUAL MIRCOPOWER, SMD, 6462
Manufacturer
National Semiconductor
Datasheet
1.LMC6462AIM.pdf
(20 pages)
Specifications of LMC6462AIM
Op Amp Type
CMOS
No. Of Amplifiers
2
Bandwidth
0.05MHz
Slew Rate
0.028V/µs
Supply Voltage Range
3V To 15.5V
Amplifier Case Style
SOIC
No. Of Pins
8
Operating Temperature Range
-40°C To
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LMC6462AIM
Manufacturer:
NS/国半
Quantity:
20 000
Part Number:
LMC6462AIMX
Manufacturer:
NS/国半
Quantity:
20 000
www.national.com
Application Information
The pulse response of the circuit shown in Figure 6 is shown
in Figure 7.
4.0 COMPENSATING FOR INPUT CAPACITANCE
It is quite common to use large values of feedback resis-
tance with amplifiers that have ultra-low input current, like
the LMC6462/4. Large feedback resistors can react with
small values of input capacitance due to transducers, pho-
todiodes, and circuits board parasitics to reduce phase mar-
gins.
FIGURE 8. Canceling the Effect of Input Capacitance
FIGURE 6. LMC6462 Non-Inverting Amplifier,
Compensated to Handle a 300 pF Capacitive
FIGURE 7. Pulse Response of
LMC6462 Circuit in Figure 6
and 100 kΩ Resistive Load
(Continued)
01205111
01205112
01205110
12
The effect of input capacitance can be compensated for by
adding a feedback capacitor. The feedback capacitor (as in
Figure 8 ), C
or
which typically provides significant overcompensation.
Printed circuit board stray capacitance may be larger or
smaller than that of a breadboard, so the actual optimum
value for C
checked on the actual circuit. (Refer to the LMC660 quad
CMOS amplifier data sheet for a more detailed discussion.)
5.0 OFFSET VOLTAGE ADJUSTMENT
Offset voltage adjustment circuits are illustrated in Figure 9
and Figure 10. Large value resistances and potentiometers
are used to reduce power consumption while providing typi-
cally
both configurations with V
6.0 SPICE MACROMODEL
A Spice macromodel is available for the LMC6462/4. This
model includes a simulation of:
• Input common-mode voltage range
• Frequency and transient response
• GBW dependence on loading conditions
• Quiescent and dynamic supply current
• Output swing dependence on loading conditions
±
2.5 mV of adjustment range, referred to the input, for
FIGURE 10. Non-Inverting Configuration
F
FIGURE 9. Inverting Configuration
F
may be different. The values of C
, is first estimated by:
Offset Voltage Adjustment
Offset Voltage Adjustment
R
1
C
S
IN
=
≤ R
±
5V.
2
C
F
F
01205113
should be
01205114