OPA690IDBVT datasheet(27/37 Pages) TI1

27 / 37 page

External

-VCC

Internal

Circuitry

OPA690

www.ti.com

SBOS223F – DECEMBER 2001 – REVISED FEBRUARY 2010

destination devices to be handled as separate

INPUT AND ESD PROTECTION

transmission lines, each with their own series and

The OPA690 is built using a very high-speed

shunt terminations. If the 6dB attenuation of a

complementary bipolar process. The internal junction

doubly-terminated

transmission

line

breakdown voltages are relatively low for these very

unacceptable,

long

trace

can

small geometry devices. These breakdowns are

series-terminated at the source end only. Treat

reflected in the Absolute Maximum Ratings table. All

the trace as a capacitive load in this case and set

device pins are protected with internal ESD protection

the series resistor value as shown in the plot of

diodes to the power supplies, as shown in Figure 50.

Recommended RS vs Capacitive Load (Figure 15

for ±5V and Figure 30 for +5V). This will not

preserve

signal

integrity

well

doubly-terminated line. If the input impedance of

the destination device is low, there will be some

signal attenuation due to the voltage divider

formed by the series output into the terminating

impedance.

e. Socketing a high-speed part like the OPA690

is not recommended. The additional lead length

Figure 50. Internal ESD Protection

and pin-to-pin capacitance introduced by the

socket can create an extremely troublesome

parasitic network which can make it almost

These diodes provide moderate protection to input

impossible to achieve a smooth, stable frequency

overdrive voltages above the supplies as well. The

response. Best results are obtained by soldering

protection

diodes

can

typically

support

30mA

the OPA690 onto the board.

continuous

current.

Where

higher

currents

are

possible (e.g., in systems with ±15V supply parts

driving into the OPA690), current-limiting series

resistors should be added into the two inputs. Keep

these resistor values as low as possible since high

values

degrade

both

noise

performance

and

frequency response.

Product Folder Link(s): OPA690

OPA690IDBVT Datasheet(PDF) 27 Page - Texas Instruments

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