lm7301-mdc National Semiconductor Corporation, lm7301-mdc Datasheet - Page 9

• Manufacturer Part Number: lm7301-mdc
• Description: Low Power, 4 Mhz Gbw, Rail-to-rail Input-output Operational Amplifier In Tinypak ?ackage
• Manufacturer: National Semiconductor Corporation

Applications Information
GENERAL INFORMATION
Low supply current and wide bandwidth, greater than rail-to-
rail input range, full rail-to-rail output, good capacitive load
driving ability, wide supply voltage and low distortion all
make the LM7301 ideal for many diverse applications.
The high common-mode rejection ratio and full rail-to-rail
input range provides precision performance when operated
in non-inverting applications where the common-mode error
is added directly to the other system errors.
CAPACITIVE LOAD DRIVING
The LM7301 has the ability to drive large capacitive loads.
For example, 1000 pF only reduces the phase margin to
about 25 degrees.
TRANSIENT RESPONSE
The LM7301 offers a very clean, well-behaved transient
response. Figures 1, 2, 3, 4, 5, 6 show the response when
operated at gains of +1 and −1 when handling both small
and large signals. The large phase margin, typically 70 to 80
degrees, assures clean and symmetrical response. In the
large signal scope photos, Figure 1 and Figure 4, the input
signal is set to 4.8V. Note that the output goes to within
100 mV of the supplies cleanly and without overshoot. In the
small signal samples, the response is clean, with only slight
overshoot when used as a follower. Figure 3 and Figure 6
are the circuits used to make these photos.
FIGURE 1.
FIGURE 2.
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POWER DISSIPATION
Although the LM7301 has internal output current limiting,
shorting the output to ground when operating on a +30V
power supply will cause the op amp to dissipate about
350 mW. This is a worst-case example. In the 8-pin SOIC
package, this will cause a temperature rise of 58˚C. In the
5-pin SOT23 package, the higher thermal resistance will
FIGURE 3.
FIGURE 4.
FIGURE 5.
FIGURE 6.
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