OPA2681 Datasheet, PDF (17/21 Pages) Burr-Brown (TI) – Dual Wideband, Current Feedback OPERATIONAL AMPLIFIER With Disable

Figure 9 will actually provide additional gain for that input’s
bias and noise currents, but will not decrease the output DC
error since the input bias currents are not matched.
the 0.1uF power supply decoupling capacitors after these
supply current limiting resistors directly on the supply pins.
OUTPUT CURRENT AND VOLTAGE
The OPA2681 provides output voltage and current capabili-
ties that are unsurpassed in a low cost dual monolithic op
amp. Under no-load conditions at 25°C, the output voltage
typically swings closer than 1V to either supply rail; the
guaranteed swing limit is within 1.2V of either rail. Into a
15Ω load (the minimum tested load), it is guaranteed to
deliver more than ±135mA.
The specifications described above, though familiar in the
industry, consider voltage and current limits separately. In
many applications, it is the voltage x current, or V-I product,
which is more relevant to circuit operation. Refer to the
“Output Voltage and Current Limitations” plot in the Typi-
cal Performance Curves. The X and Y axes of this graph
show the zero-voltage output current limit and the zero-
current output voltage limit, respectively. The four quad-
rants give a more detailed view of the OPA2681’s output
drive capabilities, noting that the graph is bounded by a
“Safe Operating Area” of 1W maximum internal power
dissipation (in this case for 1 channel only). Superimposing
resistor load lines onto the plot shows that the OPA2681 can
drive ±2.5V into 25Ω or ±3.5V into 50Ω without exceeding
the output capabilities or the 1W dissipation limit. A 100Ω
load line (the standard test circuit load) shows the full ±3.9V
output swing capability, as shown in the Typical Specifica-
tions.
The minimum specified output voltage and current over
temperature are set by worst-case simulations at the cold
temperature extreme. Only at cold startup will the output
current and voltage decrease to the numbers shown in the
guaranteed tables. As the output transistors deliver power,
their junction temperatures will increase, decreasing their
V_BE’s (increasing the available output voltage swing) and
increasing their current gains (increasing the available out-
put current). In steady state operation, the available output
voltage and current will always be greater than that shown
in the over-temperature specifications since the output stage
junction temperatures will be higher than the minimum
specified operating ambient.
To maintain maximum output stage linearity, no output
short circuit protection is provided. This will not normally
be a problem since most applications include a series match-
ing resistor at the output that will limit the internal power
dissipation if the output side of this resistor is shorted to
ground. However, shorting the output pin directly to the
adjacent positive power supply pin (8 pin package) will, in
most cases, destroy the amplifier. If additional short circuit
protection is required, consider a small series resistor in the
power supply leads. This will, under heavy output loads,
reduce the available output voltage swing. A 5Ω series
resistor in each power supply lead will limit the internal
power dissipation to less than 1W for an output short circuit
while decreasing the available output voltage swing only
0.5V for up to 100mA desired load currents. Always place
DRIVING CAPACITIVE LOADS
One of the most demanding and yet very common load
conditions for an op amp is capacitive loading. Often, the
capacitive load is the input of an A/D converter—including
additional external capacitance which may be recommended
to improve A/D linearity. A high speed, high open-loop gain
amplifier like the OPA2681 can be very susceptible to
decreased stability and closed-loop response peaking when
a capacitive load is placed directly on the output pin. When
the amplifier’s open loop output resistance is considered,
this capacitive load introduces an additional pole in the
signal path that can decrease the phase margin. Several
external solutions to this problem have been suggested.
When the primary considerations are frequency response
flatness, pulse response fidelity and/or distortion, the sim-
plest and most effective solution is to isolate the capacitive
load from the feedback loop by inserting a series isolation
resistor between the amplifier output and the capacitive
load. This does not eliminate the pole from the loop
response, but rather shifts it and adds a zero at a higher
frequency. The additional zero acts to cancel the phase lag
from the capacitive load pole, thus increasing the phase
margin and improving stability.
The Typical Performance Curves show the recommended
R_S vs Capacitive Load and the resulting frequency response
at the load. Parasitic capacitive loads greater than 2pF can
begin to degrade the performance of the OPA2681. Long PC
board traces, unmatched cables, and connections to multiple
devices can easily cause this value to be exceeded. Always
consider this effect carefully, and add the recommended
series resistor as close as possible to the OPA2681 output
pin (see Board Layout Guidelines).
DISTORTION PERFORMANCE
The OPA2681 provides good distortion performance into a
100Ω load on ±5V supplies. Relative to alternative solutions,
it provides exceptional performance into lighter loads and/or
operating on a single +5V supply. Generally, until the funda-
mental signal reaches very high frequency or power levels, the
2nd harmonic will dominate the distortion with a negligible
3rd harmonic component. Focusing then on the 2nd harmonic,
increasing the load impedance improves distortion directly.
Remember that the total load includes the feedback network—
in the non-inverting configuration (Figure 1) this is the sum of
R_F + R_G, while in the inverting configuration it is just R_F. Also,
providing an additional supply de-coupling capacitor (0.1µF)
between the supply pins (for bipolar operation) improves the
2nd order distortion slightly (3 to 6dB).
In most op amps, increasing the output voltage swing in-
creases harmonic distortion directly. The Typical Perfor-
mance Curves show the 2nd harmonic increasing at a little
less than the expected 2X rate while the 3rd harmonic
increases at a little less than the expected 3X rate. Where the
test power doubles, the difference between it and the 2nd
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OPA2681