LM148J/883 National Semiconductor, LM148J/883 Datasheet - Page 6

• Manufacturer Part Number: LM148J/883
• Description: IC,Operational Amplifier,QUAD,BIPOLAR,DIP,14PIN,CERAMIC
• Manufacturer: National Semiconductor

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Typical Performance Characteristics
Inverting Large Signal Pulse
Response (LM148)
Negative Common-Mode Input
Voltage Limit
Application Hints
The LM148 series are quad low power 741 op amps. In the
proliferation of quad op amps, these are the first to offer the
convenience
characteristics of the 741 op amp. In those applications
where 741 op amps have been employed, the LM148 series
op amps can be employed directly with no change in circuit
performance.
The LM149 series has the same characteristics as the
LM148 except it has been decompensated to provide a
wider bandwidth. As a result the part requires a minimum
gain of 5.
The package pin-outs are such that the inverting input of
each amplifier is adjacent to its output. In addition, the
amplifier outputs are located in the corners of the package
which simplifies PC board layout and minimizes package
related capacitive coupling between amplifiers.
The input characteristics of these amplifiers allow differential
input voltages which can exceed the supply voltages. In
addition, if either of the input voltages is within the operating
common-mode range, the phase of the output remains
correct. If the negative limit of the operating common-mode
range is exceeded at both inputs, the output voltage will be
positive. For input voltages which greatly exceed the
maximum
common-mode, resistors should be placed in series with the
inputs to limit the current.
supply
of
familiar,
voltages,
DS007786-41
DS007786-5
easy
either
to
differentially
use
Input Noise Voltage and
Noise Current
operating
or
(Continued)
6
Like the LM741, these amplifiers can easily drive a 100 pF
capacitive load throughout the entire dynamic output voltage
and current range. However, if very large capacitive loads
must be driven by a non-inverting unity gain amplifier, a
resistor should be placed between the output (and feedback
connection) and the capacitance to reduce the phase shift
resulting from the capacitive loading.
The output current of each amplifier in the package is limited.
Short circuits from an output to either ground or the power
supplies will not destroy the unit. However, if multiple output
shorts occur simultaneously, the time duration should be
short to prevent the unit from being destroyed as a result of
excessive power dissipation in the IC chip.
DS007786-42
Positive Common-Mode
Input Voltage Limit
DS007786-43