OPA4872-EP Datasheet, PDF (20/24 Pages) Texas Instruments – 4:1 HIGH-SPEED MULTIPLEXER

OPA4872-EP
SBOS444 – DECEMBER 2008........................................................................................................................................................................................... www.ti.com
e) Socketing a high-speed part like the OPA4872
is not recommended. The additional lead length and
pin-to-pin 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 OPA4872 onto the board.
INPUT AND ESD PROTECTION
The OPA4872 is built using a very high-speed
complementary bipolar process. The internal junction
breakdown voltages are relatively low for these very
small geometry devices. These breakdowns are
reflected in the Absolute Maximum Ratings table. All
device pins have limited ESD protection using internal
diodes to the power supplies as shown in Figure 36.
+V_CC
External
Pin
Internal
Circuitry
-V_CC
Figure 36. Internal ESD Protection
These diodes provide moderate protection to input
overdrive voltages above the supplies as well. The
protection diodes can typically support 30-mA
continuous current. Where higher currents are
possible (for example, in systems with ±15-V supply
parts driving into the OPA4872), 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.
20
Submit Documentation Feedback
Product Folder Link(s): OPA4872-EP
Copyright © 2008, Texas Instruments Incorporated