mc33174vdr2 ON Semiconductor, mc33174vdr2 Datasheet - Page 6

• Manufacturer Part Number: mc33174vdr2
• Description: Single Supply 3 V To 44 V, Low Power Single Op Amp
• Manufacturer: ON Semiconductor

MC33171/72/74 amplifier family is similar to low power op
amp products utilizing JFET input devices, these amplifiers
offer additional advantages as a result of the PNP transistor
differential inputs and an all NPN transistor output stage.
input stage includes the V
operation is feasible to as low as 3.0 V with the common
mode input voltage at ground potential.
to ±44 V, provided the maximum input voltage range is not
exceeded. Specifically, the input voltages must range
between V
maximum rating table. In practice, although not
recommended, the input voltages can exceed the V
voltage by approximately 3.0 V and decrease below the V
voltage by 0.3 V without causing product damage, although
output phase reversal may occur. It is also possible to source
up to 5.0 mA of current from V
clamping diode without damage or latching, but phase
reversal may again occur. If at least one input is within the
common mode input voltage range and the other input is
within the maximum input voltage range, no phase reversal
will occur. If both inputs exceed the upper common mode
input voltage limit, the output will be forced to its lowest
voltage state.
geometry input device is substantially lower (0.8 pF) than
that of a typical JFET (3.0 pF), the frequency response for
a given input source resistance is greatly enhanced. This
becomes evident in D−to−A current to voltage conversion
applications where the feedback resistance can form a pole
with the input capacitance of the op amp. This input pole
creates a 2nd Order system with the single pole op amp and
is therefore detrimental to its settling time. In this context,
lower input capacitance is desirable especially for higher
values of feedback resistances (lower current DACs). This
input pole can be compensated for by creating a feedback
zero with a capacitance across the feedback resistance, if
necessary, to reduce overshoot. For 10 kW of feedback
resistance, the MC33171/72/74 family can typically settle to
within 1/2 LSB of 8 bits in 4.2 ms, and within 1/2 LSB of 12
bits in 4.8 ms for a 10 V step. In a standard inverting unity
gain fast settling configuration, the symmetrical slew rate is
typically ± 2.1 V/ms. In the classic noninverting unity gain
configuration the typical output positive slew rate is also
2.1 V/ms, and the corresponding negative slew rate will
usually exceed the positive slew rate as a function of the fall
time of the input waveform.
equivalent circuit schematic, offers unique advantages over
the more conventional NPN/PNP transistor Class AB output
stage. A 10 kW load resistance can typically swing within
Although the bandwidth, slew rate, and settling time of the
Because the input common mode voltage range of this
The input stage also allows differential input voltages up
Since the input capacitance associated with the small
The all NPN output stage, shown in its basic form on the
APPLICATIONS INFORMATION − CIRCUIT DESCRIPTION/PERFORMANCE FEATURES
CC
and V
EE
supply voltages as shown by the
EE
EE
potential, single supply
through either inputs’
http://onsemi.com
CC
EE
6
0.8 V of the positive rail (V
providing a 28.4 Vpp swing from ±15 V supplies. This large
output swing becomes most noticeable at lower supply
voltages.
the current source transistor Q7, the V
transistor Q17, and the voltage drop associated with the
short circuit resistance, R5. For sink currents less than
0.4 mA, the negative swing is limited by the saturation
voltage of the pull−down transistor Q15, and the voltage
drop across R4 and R5. For small valued sink currents, the
above voltage drops are negligible, allowing the negative
swing voltage to approach within millivolts of V
currents (> 0.4 mA), diode D3 clamps the voltage across R4.
Thus the negative swing is limited by the saturation voltage
of Q15, plus the forward diode drop of D3 (≈V
Therefore an unprecedented peak−to−peak output voltage
swing is possible for a given supply voltage as indicated by
the output swing specifications.
ground for single supply applications, the maximum
possible output swing can be achieved for a given supply
voltage. For light load currents, the load resistance will pull
the output to V
will pull the load resistance near ground during the negative
swing. The load resistance value should be much less than
that of the feedback resistance to maximize pull−up
capability.
been eliminated, the MC33171/72/74 family offers a 15 mA
minimum current sink capability, typically to an output
voltage of (V
output can directly source or sink base current from a
common emitter NPN transistor for current switching
applications.
inherently faster than PNP types, contributing to the bipolar
amplifier’s improved gain bandwidth product. The
associated high frequency low output impedance (200 W typ
@ 1.0 MHz) allows capacitive drive capability from 0 pF to
400 pF without oscillation in the noninverting unity gain
configuration. The 60° phase margin and 15 dB gain margin,
as well as the general gain and phase characteristics, are
virtually independent of the source/sink output swing
conditions. This allows easier system phase compensation,
since output swing will not be a phase consideration. The AC
characteristics of the MC33171/72/74 family also allow
excellent active filter capability, especially for low voltage
single supply applications.
5.0 V, these amplifiers are functional to at least 3.0 V @
25°C. However slight changes in parametrics such as
bandwidth, slew rate, and DC gain may occur.
The positive swing is limited by the saturation voltage of
If the load resistance is referenced to V
Because the PNP output emitter−follower transistor has
In addition, the all NPN transistor output stage is
Although the single supply specification is defined at
EE
CC
+1.8 V). In single supply applications the
during the positive swing and the output
CC
) and negative rail (V
BE
of the NPN pull−up
CC
EE
EE
instead of
. For sink
+1.0 V).
EE
),