INPUT AND ESD PROTECTION

External

Pin

+V

CC

-VCC

Internal

Circuitry

OPA2889

SBOS373B – JUNE 2007 – REVISED AUGUST 2008 ....................................................................................................................................................... www.ti.com

e) Socketing a high-speed part like the OPA2889

protection

diodes

can

typically

support

30mA

is not recommended. The additional lead length and

continuous

current.

Where

higher

currents

are

pin-to-pin capacitance introduced by the socket can

possible (for example, in systems with ±15V supply

create an extremely troublesome parasitic network

parts driving into the OPA2889), current-limiting

that can make it almost impossible to achieve a

series resistors should be added into the two inputs.

smooth, stable frequency response. Best results are

Keep these resistor values as low as possible since

obtained by soldering the OPA2889 onto the board.

high values degrade both noise performance and

frequency response.

The OPA2889 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 are protected with internal ESD protection

diodes to the power supplies, as shown in Figure 64.

These diodes provide moderate protection to input

Figure 64. Internal ESD Protection

overdrive voltages above the supplies as well. The

28

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