AD8024 Ver la hoja de datos (PDF) - Analog Devices

Número de pieza

componentes Descripción

Fabricante

AD8024

Quad 350 MHz 24 V Amplifier

Analog Devices 

AD8024

Overload Recovery

The most important overload conditions are:

Input Common-Mode Voltage Overdrive

Output Voltage Overdrive

Input Current Overdrive.

When configured for a low closed-loop gain, the AD8024

recovers quickly from an input common-mode voltage over-

drive; typically in <25 ns.

When configured for a higher gain and overloaded at the output,

recovery from an output voltage overdrive is also short; approxi-

mately 55 ns (see Figure 5). For higher overdrive, the response

is somewhat slower. For 100% overdrive, the recovery time is

substantially longer.

When configured for a high noninverting gain, a high input over-

drive can result in a large current into the input stage. Although

this current is internally limited to approximately 30 mA, its

effect on the total power dissipation may be significant. See also

the warning under Maximum Power Dissipation.

Disable Mode Operation

When the Disable pin is tied to DGND, all amplifiers are opera-

tional, in the enabled state.

When the voltage on the Disable pin is raised to 1.6 V or more

above DGND, all amplifiers are in the disabled, powered-down

state. In this condition, the DISABLE pin sources approximately

0.1 µA, the total quiescent current is reduced to approximately

500 µA, all outputs are in a high impedance state, and there is a

high level of isolation from inputs to outputs.

The output impedance in the disabled mode is the equivalent of all

external resistors, seen from the output pin, in parallel with the

total disabled output impedance of the amplifier, typically 20 pF.

The input stages of the AD8024 include protection from large

differential input voltages that may be present in the disabled

mode. Internal clamps limit this voltage to 1.5 V. The high input-

to-output isolation is maintained for voltages below this limit.

1V

VIN

50ns

VOUT

5V

Figure 5. 15% Overload Recovery, Gain = +10

(RFB = 400 Ω, RL = 1 kΩ, VS = ±7.5 V)

–10–

REV. C

Share Link: