OPA890IDBV BURR-BROWN [Burr-Brown Corporation], OPA890IDBV Datasheet - Page 25

• Manufacturer Part Number: OPA890IDBV
• Description: Low-Power, Wideband, Voltage-Feedback OPERATIONAL AMPLIFIER with Disable
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

e. Socketing a high-speed part such as the
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impedance. The high output voltage and
current capability of the OPA890 allows
multiple destination devices to be handled as
separate transmission lines, each with its
respective series and shunt terminations. If
the 6dB attenuation of a doubly-terminated
transmission line is unacceptable, a long trace
can be series-terminated at the source end
only. Treat the trace as a capacitive load in
this case, and set the series resistor value as
shown in the plot of Recommended R
Capacitive Load. This configuration does not
preserve
doubly-terminated line. If the input impedance
of the destination device is low, there will be
some signal attenuation because of the
voltage divider formed by the series output
into the terminating impedance.
OPA890
additional
capacitance introduced by the socket can
create an extremely troublesome parasitic
network that can make it almost impossible to
achieve a smooth, stable frequency response.
Best results are obtained by soldering the
OPA890 directly onto the board.
signal integrity
is
lead
not
length
recommended.
as
and
well
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pin-to-pin
as
S
The
vs
a
INPUT AND ESD PROTECTION
The OPA890 is built using a very high-speed,
complementary,
junction breakdown voltages are relatively low for
these
breakdowns are reflected in the
Ratings
internal ESD protection diodes to the power supplies,
as shown in
These diodes provide moderate protection to input
overdrive voltages above the supplies as well. The
protection diodes can
continuous current. Where higher currents are
possible (for example, in systems with 15V supply
parts driving into the OPA890), current-limiting series
resistors should be added into the two inputs. Keep
these resistor values as low as possible, because
high values degrade both noise performance and
frequency response.
External
Pin
very
Figure 55. Internal ESD Protection
table. All device pins are protected with
Figure
small
bipolar
55.
-V
+V
geometry
CC
CC
typically
process.
Absolute Maximum
devices.
SBOS369 – MAY 2007
support
The
Internal
Circuitry
OPA890
internal
These
30mA
25