OPA2690 datasheet(23/33 Pages) TI

23 / 33 page

OPA2822

SBOS188E

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well as a 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 OPA2822 is not

recommended. The additional lead length and pin-to-pin ca-

pacitance introduced by the socket can create an extremely

troublesome parasitic network, which can make it almost impos-

sible to achieve a smooth, stable frequency response. Best

results are obtained by soldering the OPA2822 onto the board.

INPUT AND ESD PROTECTION

The OPA2822 is built using a very high-speed complementary

bipolar process. The internal junction breakdown voltages are

relatively low due to these very small geometry devices. These

breakdowns are reflected in the Absolute Maximum Rating

table. All device pins are protected with internal ESD protection

diodes to the power supplies, as shown in Figure 14.

These diodes provide moderate protection to input overdrive

voltages above the supplies as well. The protection diodes can

typically support 30mA continuous current. Where higher cur-

rents are possible (for example, in systems with

±15V supply

parts driving into the OPA2822), 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.

FIGURE 14. Internl ESD Protection.

External

–V

Internal

Circuitry

OPA2690 Datasheet(PDF) 23 Page - Texas Instruments