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OPA2652 Fiches technique(PDF) 11 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
No de pièce OPA2652
Description  Dual, 700MHz, Voltage-Feedback OPERATIONAL AMPLIFIER
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Fabricant  BURR-BROWN [Burr-Brown (TI)]
Site Internet  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

OPA2652 Fiches technique(HTML) 11 Page - Burr-Brown (TI)

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11
®
OPA2652
RF and RG need to be equal to maintain a constant gain
magnitude. The rise and fall times of the input pulses (tr(IN))
should be slow enough to prevent pre-shoot artifacts in the
response.
tr(IN) ≥ 5RC, minimal pre-shoot
SIMPLE BANDPASS FILTER
Figure 7 shows the OPA2652 used as simple bandpass filter.
The OPA2652 is well suited for this type of circuit because
it is very stable at a noise gain of +1.
MACROMODELS AND APPLICATIONS SUPPORT
Computer simulation of circuit performance using SPICE is
often useful when analyzing the performance of analog
circuits and systems. This is particularly true for Video and
RF amplifier circuits where parasitic capacitance and induc-
tance can have a major effect on circuit performance. Check
the Burr-Brown web site (www.burr-brown.com) for avail-
able SPICE products (not all parts have models). These
models do a good job of predicting small-signal AC and
transient performance under a wide variety of operating
conditions. They do not do as well in predicting the har-
monic distortion or dG/d
φ characteristics. These models do
not attempt to distinguish between the package types in their
small-signal AC performance.
OPERATING SUGGESTIONS
OPTIMIZING RESISTOR VALUES
Since the OPA2652 is a unity gain stable voltage feedback
op amp, a wide range of resistor values may be used for the
feedback and gain setting resistors. The primary limits on
these values are set by dynamic range (noise and distortion)
and parasitic capacitance considerations. For a non-inverting
unity gain follower application, the feedback connection
should be made with a 25
Ω resistor, not a direct short. This
will isolate the inverting input capacitance from the output
pin and improve the frequency response flatness. Usually,
the feedback resistor value should be between 200
Ω and
1.5k
Ω. Below 200Ω, the feedback network will present
additional output loading which can degrade the harmonic
distortion performance of the OPA2652. Above 1.5k
Ω, the
typical parasitic capacitance (approximately 0.2pF) across
the feedback resistor may cause unintentional band-limiting
in the amplifier response.
A good rule of thumb is to target the parallel combination of
RF and RG (Figure 1) to be less than approximately 300Ω.
The combined impedance RF || RG interacts with the invert-
ing input capacitance, placing an additional pole in the
feedback network, and thus a zero in the forward response.
Assuming a 2pF total parasitic on the inverting node, hold-
ing RF || RG < 300Ω will keep this pole above 250MHz. By
itself, this constraint implies that the feedback resistor RF
can increase to several k
Ω at high gains. This is acceptable
as long as the pole formed by RF and any parasitic capaci-
tance appearing in parallel is kept out of the frequency range
of interest.
1/2
OPA2652
402
C
R
402
1/2
OPA2652
R
G
402
R
F
402
C
V
O
V
IN
+5V
–5V
+5V
–5V
R
V
OUT
V
IN
+5V
–5V
C
2
C
1
402
402
402
1/2
OPA2652
DESIGN-IN TOOLS
DEMONSTRATION BOARDS
PC boards are available to assist in the initial evaluation of
circuit performance using the OPA2652. They are available
free as unpopulated PC boards delivered with descriptive
documentation. The summary information for these boards is
shown below:
FIGURE 6. Pulse Delay Circuit.
FIGURE 7. Inverting Bandpass Filter.
BOARD
PART
ORDERING
PRODUCT
PACKAGE
NUMBER
NUMBER
OPA2652U
8-Lead SO-8
DEM-OPA26xU
MKT-352
OPA2652E
SOT23-8
DEM-OPA2652E
MKT-365
Contact the Burr-Brown Applications support line to request
this board.


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